PRECITEC CHRocodile CLS0.2 User manual

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CHRocodile CLS
Optical line sensor for non-contact distance and thickness measurement
Operation Manual

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Imprint
This documentation is under the copyright of Precitec Optronik GmbH.
It may not be reproduced or used in a manner contrary to the company’s legal interests without prior
written approval of Precitec Optronik GmbH. It is strictly intended for use in the context of service
operations. Any other use is impermissible. Any sharing of this documentation with third parties
requires the prior, expressed written approval of Precitec Optronik GmbH.
Changes in the technical details from the descriptions, data and figures in this documentation are
reserved.
Printed in the Federal Republic of Germany.
Responsible for Contents
Original Edition
Precitec Optronik GmbH
Schleussnerstrasse 54
63263 Neu-Isenburg / Germany
Telephone: [phone] / 36 76 – 100
Telefax: 0049 (0)6102 / 36 76 – 126
e-mail: [e-mail]
Website: http://www.precitec.de/en/precitec-group-start-page/
Representatives
Please visit our website to know the current addresses of our representatives.
PRECITEC OPTRONIK's regional contacts for the Optical Measuring Technology can be found here:
http://www.precitec.de/en/contact/precitec-worldwide/

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Version Control
Version –
Manual Date Type of Change
1.0.0.0 2014/01/29 Original edition
1.0.0.1 2014/03/13 Updated Mechanical plans and specifications
1.0.0.2 2014/05/12 Auto Reference procedure
1.0.0.3 2014/05/22 Specifications correction
1.0.0.4 2014/09/09 EMC compatibility + Jumbo packet + Medical or safety-relevant usage
1.0.0.5 2014/11/06 Ethernet connection + Status LED + Optical head specifications
1.0.0.6 2015/09/17
Optical head specifications + Sync In additional information + CLS
Explorer + 6KHz measuring mode + CLS Explorer Library coming soon +
DLL C++.
1.0.1.0 2016/03/10 New Optical Head CLS2.3
1.0.1.1 2016/07/18
Encoder interface modification + CLS Explorer Ultimate version + High
frequency mode used with CLS2.3 + Auto-reference procedure disabled

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Table of Contents
Table of Contents ........................................................................................................... 4
Basic Safety Instructions ................................................................................................ 8
1.1 Warranty and Liability ...................................................................................... 8
1.2 Safety Symbols .................................................................................................. 8
1.3 Proper Use ......................................................................................................... 9
1.4 Duty of Operator and Personnel ..................................................................... 10
1.5 Safety Measurements in Normal Operation ................................................... 10
1.5.1 Protection from Electronic Shock .......................................................................................... 10
1.5.2 Protection from Optic Radiation / Eye Safety ..................................................................... 10
1.5.3 Grounding the device .............................................................................................................. 11
1.6 Medical or safety-relevant usage .................................................................... 11
1.7 Storage and Transport ..................................................................................... 11
1.8 Emergency Procedures .................................................................................... 11
Product Description ....................................................................................................... 12
2.1 General Description ......................................................................................... 12
2.2 Measuring principle .......................................................................................... 13
2.2.1 Optical principle ..................................................................................................................... 13
2.2.2 Principle applied to multiple points sensor .......................................................................... 14
2.3 Sensor Functionalities ...................................................................................... 15
2.4 Typical applications (Overview) ...................................................................... 17
2.5 List of Deliverables ......................................................................................... 18
2.6 Connections and Interfaces ............................................................................ 20
2.6.1 ON / OFF Switch button .........................................................................................................20

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2.6.2 Power supply jack ...................................................................................................................20
2.6.3 USB port RS232 serial communication................................................................................... 21
2.6.4 Ethernet connector ................................................................................................................. 21
2.6.5 Encoder-input .......................................................................................................................... 21
2.6.6 Trigger Input/Output / RS422 serial communication .......................................................... 22
2.6.7 Status LED ................................................................................................................................ 24
2.7 Sensor Characteristics .................................................................................... 25
2.7.1 Sensor unit characteristics ..................................................................................................... 25
2.7.2 High Frequency Mode.............................................................................................................. 26
2.7.3 Optical Heads characteristics ................................................................................................ 27
2.8 Optical Head Specifications definitions ......................................................... 28
2.9 CHRocodile CLS performance specifications: ................................................ 29
Operational Start up ...................................................................................................... 31
3.1 Connections and Interfaces ............................................................................. 31
3.2 CHRocodile CLS Explorer and Drivers installations ....................................... 33
3.3 Communication with CHRocodile CLS ............................................................ 33
3.4 CLS Explorer Library ....................................................................................... 34
Measurements Start Up ................................................................................................ 36
4.1 Calibration Table ............................................................................................ 36
4.2 Dark Acquisition .............................................................................................. 36
4.3 Auto Reference procedure ............................................................................. 37
4.4 Mechanical interfacing ................................................................................... 37
4.5 Basic Settings Configuration ........................................................................... 38
4.6 Data measurement Training ........................................................................... 38
Advanced Configuration ................................................................................................ 41
5.1 Commands List ................................................................................................. 41

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5.2 Detailed Commands Description .................................................................... 43
5.2.1 DNLD Command ...................................................................................................................... 43
5.2.2 ETR Command .................................................................................................................... 43
5.2.3 IPCN Command ................................................................................................................... 44
5.2.4 LAI Command...................................................................................................................... 45
5.2.5 NOP Command .................................................................................................................... 46
5.2.6 SCA Command .................................................................................................................... 47
5.2.7 SHZ Command .................................................................................................................... 48
5.2.8 SODX Command .................................................................................................................. 49
5.2.9 SSU Command ..................................................................................................................... 56
5.2.10 STA Command .................................................................................................................... 57
5.2.11 STO Command .................................................................................................................... 58
5.2.12 THR Command .................................................................................................................... 59
5.2.13 TRE Command ....................................................................................................................60
5.2.14 TRG Command .................................................................................................................... 61
5.2.15 VER Command .................................................................................................................... 62
5.2.16 Calibration Table Download Function ............................................................................ 62
Mechanical Plans .......................................................................................................... 63
6.1 Optical Head Mechanical plans ...................................................................... 63
6.2 CHRocodile CLS unit mechanical plans .......................................................... 65
6.3 CHRocodile CLS unit mechanical interface plans.......................................... 66
Maintenance .................................................................................................................. 67
7.1 How to change fans......................................................................................... 67
7.2 Optional accessories ....................................................................................... 69
7.2.1 Fans .......................................................................................................................................... 69
7.2.2 Cables ....................................................................................................................................... 70
Trouble Shooting ............................................................................................................ 71
8.1 Power off: ......................................................................................................... 71
8.2 Communication error: ..................................................................................... 71

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8.3 Distance Measurement: ................................................................................... 71
8.4 Thickness measurement: ................................................................................ 72
Technical support ......................................................................................................... 74

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Basic Safety Instructions
This operation manual contains the most important instructions for the safe operation of the product.
Observe all instructions and guidelines in this documentation.
Moreover, the locally applicable regulations and codes for accident
prevention at the use site must be observed.
1.1 Warranty and Liability
The general terms and conditions of delivery for products and services in the electronics industry
along with the amendments and restrictions deriving from the general terms and conditions of delivery
for Precitec Optronik GmbH apply to all of our products.
We reserve the right to make any changes to the device’s construction for reasons of improving quality
or expanding the possible applications as well as any made for production-related reasons.
Dismantling the device voids all warranty claims. The exception to this is the replacement of parts that
are subject to wear and tear and require maintenance or calibration, to the extent that these are
expressly identified in this documentation.
Changes made to the device on own authority render liability claims void.
1.2 Safety Symbols
The following terms and symbols for hazards and instructions are used in the operation manual.
WARNING
This symbol indicates a possibly dangerous situation. Failure to heed
these instructions can result in minor injuries or cause property damage.
WARNING
High voltage hazard – indicates a hazard from electr
ical shock and
warns of immediate or impending danger to the life and health of
persons or of extensive property damage.

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WARNING
Do not touch –
indicates that touching the contact/optics surface can
cause damage/destruction of the component.
IMPORTANT
Information which the user must pay attention to/ be aware of in order to
avoid disruptions in the course of processing/ in product use.
TIP
Provides information that the user needs in order to achieve the
intended result of an action most directly and without difficulty.
PREREQUISITE
Describes all components as well as all conditions that must be present/
be fulfilled in order to the action to be successfully completed.
ADDITIONAL INFORMATION
Informs the user whenever there is add
itional information about a
context being described.
1.3 Proper Use
The optical sensor is intended as a stand-
alone device or as part of a measurement apparatus for
measuring distance, thickness and surfaces for quality and dimensional control.
Only use
the optical sensor in a dry environment. The device may only be operated within the
specifications given in the technical data.
Any use deviating from the intended and proper use is considered
improper. The user assumes liability for the consequence
s in these
cases.
Electromagnetic
Compatibility (EMC)
Both as an individual device and in combination with the devices
designated in this documentation, the optical sensor fulfils the
requirements of the standards DIN EN 61326-1:2013-07 and
DIN EN
61010-1:2011-07, and therefore corresponds to the EU-
Directive
2014/35/EU and 2014/30/EU. This declaration is valid for all units with
the CE label on it, and it loses its validity if a modification is done on
the product.
When customer-supplied devices or cab
les are used this can mean
that these Norms may not be fulfilled. For this reason, you should only

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use the original devices and replacement parts and observe the
instructions for EMC-
compliant installation in the handbooks that
come with them.
If the opti
cal sensor is operated inside a facility with other devices, the
entire facility must comply with the provisions in the EC-
Guidelines in
the demands of the general operating permit.
1.4 Duty of Operator and Personnel
The operator of the device is obligated only to allow persons to work on the device who:

are familiar with the basic regulations concerning workplace safety and accident prevention and
who have been instructed in the operation of the device
 have read and understood the safety chapter of this op
eration manual and have confirmed this with
their signature.
The personnel must be trained in compliance with the regulations and safety instructions and must
have been informed of possible hazards.
1.5 Safety Measurements in Normal Operation
When it is assumed that the device can no longer be operated safety, the device or the plant must be
taken out of operation. The device must be secured against unintended use. Unauthorized
interventions will void your rights to assert warranty claims.
Any attempt to copy or analyze the software will lead without fail to the voiding of all rights to assert
warranty claims.
1.5.1 Protection from Electronic Shock
Please make sure that the live components are uncovered after
opening the housing or removing components. Touc
hing these
components presents a potentially lethal hazard.
When service-
and repair work is performed on opened devices and
modules, the main power supply must be reliably shut off (mains cable
unplugged).
1.5.2 Protection from Optic Radiation / Eye Safety
When performing service and maintenance work, make sure that you

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do not look directly into the LED’s light. The light can harm your eyes.
1.5.3 Grounding the device
Make sure that the device is grounded in compliance with
regulations. Please make sure th
at the optical sensor is supplied
with power via a grounded main power input line (cold device
plug).
1.6 Medical or safety-relevant usage
If the CHRocodile Line Sensor is used in medical or safety-
relevant
applications, the operator must ensure that the CHRocodile
Line
S
ensor is qualified for the specific application. This includes the
optical characteristics of the measured sample as well as the
influence of temperature and vibrations to the CHRocodile sensor.
Furthermore the user has to check the CHRocodile Line S
ensor for
correct measurements and for exceeding the specified measuring
uncertainty.
1.7 Storage and Transport
In order to avoid damages in storage and transport, the following ground rules are to be observed:
 Maintain the storage temperature range allowed in the technical specifications
 Take suitable measures to avoid any damage from humidity or moisture, vibrations or impact
 Do not store in or near magnetic fields (e.g. permanent magnet or alternating electrical field)
1.8 Emergency Procedures
 Disconnect the plant from the main power supply
 Extinguish any flames with a Class B fire extinguisher

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Product Description
2.1 General Description
The CHRocodile CLS is a multi-point optical sensor dedicated to non-contact surface measurement.
This sensor is based on Confocal Chromatic principle which authorizes high resolution and high speed
thickness and altitude measurement. The CHRocodile CLS can measure 192 points simultaneously
with a measuring rate of 2000 Lines/s corresponding to 384000 points/s.
This device consist in a sensor unit that contains a light source, an optical probe, a spectrometer and
all electronic and software for data processing and transmission.
In addition to be very fast and precise, the CHRocodile CLS has an original architecture with no
exposed optical cable. This unique architecture makes CHRocodile CLS sensor ideally adapted for
industrial control. CHRocodile CLS thus overcomes the device integrating constraints met in industrial
environment, e.g. on production line, induced by optical fiber cable presence.
Due to their length, their low capability to resist to torsional and elongation stress, their photometric
transmission intensity loss according to imposed radius of curvature, optical fiber cables are subject to
damage when the measuring device is exposed to high acceleration and/or rotational displacement.
PRECITEC is the first company to propose a confocal chromatic device, with all elements embedded
in one Optoelectronic unit (no apparent optical cables) in order to adapt to industrial changing
requirement.
The CHRocodile CLS can accommodate different types of optical head. These Optical Heads can be
mounted on CHRocodile CLS in a straight version or in a right angled version (see Fig. 2-1). The
Optical Head interchangeability is straight forward, as the operator just need to exchange Optical
Head and move to the right calibration table. Finally, data transmission is carried out by ETHERNET
communication. All CHRocodile CLS characterisctics are described in Section 2.7.
Fig 2-1: CHRocodile CLS 3D view: a- Straight version b- Right angled version
b-
a-

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2.2 Measuring principle
2.2.1 Optical principle
For most industrial applications the chromatically coded distance detection method turned out to be
very well suited. CHRocodile CLS is based on this method and more precisely on the Confocal
Chromatic principle. This principle combines the properties of confocality and axial chromatism.
Axial Chromatism:
That method takes advantage from a lens optical error commonly known as axial chromatic aberration:
the axial position of the focal point depends on the wavelength (color) of the light to be focused. For
example, in the visible spectral range, the focal distance for blue light ( 400nm) is shorter than for red
light ( 700nm). The focal points of intermediate wavelengths are located in between according to a
continuous axial position variation. Thus, considering White Light passing through an optical objective
provided with axial chromatic aberration, a continuum of color along the optical axis is generated, as
an axial rainbow.
Confocality:
That method also takes advantage from confocal opto-mechanical configuration. A confocal optical
system uses illumination point source and a pinhole in an optically conjugate plane in front of the
detecting system to eliminate out-of-focus signal. As only in focus light can be detected, the image's
optical lateral and axial resolution is improved. Consequently the pinhole act as a spatial filter which
block light which is out of focus or light which come from an external light source.
Confocal Chromatic Imaging:
Considering both confocality and axial chromatism properties, a White Light illumination point is
imaged through the chromatic objective on a target object. Depending on the distance of the target
from the focusing chromatic objective, light of just a very narrow wavelength bandwidth is perfectly
focused on the target’s surface. All other spectral components of the light source are out of focus. In
the back path, from the target’s surface to the detector, the reflected light passes through the
chromatic objective, the optically conjugate pinhole which is in front of the spectrometer. The pinhole
filters all wavelengths except the narrow bandwidth which is in focus. The spectrometer analyses the
spectrum of the light reflected back by the target’s surface, and only a chromatic peak is observed
corresponding to the narrow wavelength bandwidth perfectly in focus. The analysis and the barycenter
calculation of this chromatic peak allow to determine the distance of the target surface from the
chromatic objective. (Cf. Fig. 2.2 and 2.3)

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Fig. 2-2: Chromatic Confocal Imaging principle (point sensor)
2.2.2 Principle applied to multiple points sensor
Applying Confocal Chromatic Imaging to multipoint sensor consists in increasing the number of
illumination point’s source and the number of pinhole in front of the detector spectrometer. In this
configuration, the spectrometer is preferably bidimensionnal. One direction corresponds to the channel
number and the other direction carry the wavelength information. Consequently the spectrometer carry
the information of each point focused on the target’s surface, and the distance of the target surface
from the chromatic objective can be calculated for all the focused points. According to CHRocodile
CLS, the focused points describe a line composed of 192 equally separated points.

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2.3 Sensor Functionalities
The CHRocodile CLS has two different measuring mode: Distance and Thickness measurement. The
principle of these two measuring mode are explained hereafter.
Mode 1
Chromatic Distance Measurement
Topographic, profile or roughness measurements are performed in Mode
1 (confocal distance measurement). In this process, 192 points along a
white light line are focused on the surface of the measured object using
an optic with a known chromatic aberration. The reflected light is more
intense for the wavelength in focus on the surface. For each of the 192
channels, reflected light is spectrally analyzed and the spectral response
is a peak centered on focused wavelengths. The 192 spectral peak
positions determine the distance to the surface of each of the 192 points
along the line. The 192 distances are simultaneously calculated and
transmitted to host computer at up to 2KHz frequency See Fig. 2-3. A
high frequency mode is now available to measure up to 6KHz. See
Section 2-7-2.
Fig. 2-3: Chromatic measurement principle, distance measurement
Chromatic Optical Head

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Mode 2
Chromatic Thickness Measurement
Thickness measurements are performed in Mode 2 (confocal thickness
measurement). If a transparent material is within the measurement
volume of the Chromatic Optical Head, 192 points along a white light line
are focused on both the two surfaces of the measured object. The
reflected light is more intense for the two wavelengths in focus on the two
surfaces. For each of the 192 channels, reflected light is spectrally
analyzed and the spectral response is constituted of two peaks centered
on focused wavelengths. Considering the refractive index of the object,
one can determine the thickness of the object for the 192 points along the
line. The 192 thicknesses are simultaneously calculated and transmitted
to host computer at up to 2KHz frequency. See Fig. 2-4. A high frequency
mode is now available to measure up to 6KHz. See Section 2-7-2.
Fig. 2-4: Chromatic measurement principle, thickness measurement
Chromatic Optical Head

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2.4 Typical applications (Overview)
A broad range of possible applications is available to this highly precise sensor.
The CHRocodile CLS is the fastest sensor based on confocal chromatic imaging principle. They are
perfectly suitable for demanding measuring tasks, like non-contact measurement of microtopography,
layer thickness measurements. It could be used both on various reflecting and scattering surfaces.
The PRECITEC confocal chromatic line sensor is very well adapted to industrial environment, as no
optical cable are connected to the CHRocodile CLS unit. The absence of optical cables, promotes
robustness and compactness of the measuring device, and also facilitates the integration and use on
a motorized moving system, such as a coordinate measuring machine (CMM). Then this new type of
sensor overcomes the industrial constraints induced by fiber optic cables that are known to deteriorate
when the measuring device is subject to high accelerations and / or rotational movements.
The CHRocodile CLS offers the ability to perform fast and accurate metrological control of production,
by being built on automatic or semi -automatic inspection machines, or by being directly integrated on
production line for 100% inspection of manufactured parts. In this, this new technology fully meets the
current needs of the industry as it is suitable for many applications:
- The measurement of wafer in the field of semiconductor and generally microelectronics,
- The measurement and online control of mechanical or optical parts,
- Or even the measurement and control of glass or plastic film thickness.
Other fields of applications exist, the common point is to seek a measurement system going faster and
faster, more and more compact and as flexible as possible, it is the case in laboratory environment
and even more in industrial environment. It appears clearly here that the CHRocodile CLS unit of
measurement meet these different needs.
Optical Head
Application
CLS
200µm
CLS
1mm
CLS
2.3mm
CLS
4mm
Electronics    
Micro-Electronics    
Mechanics    
Micro-Mechanics    
Optics    
Micro-Optics    
Shape    
Flatness    
Roughness    
Plastic and glass thickness    
Thin film thickness    
Coating thickness    
Table 2.1: Sensor applications

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2.5 List of Deliverables
- One operational Confocal Chromatic Line Sensor unit (see Fig. 2-6),
- One operational Optical Head (see Fig. 2-7),
- One set of electric cables (power supply) (see Fig. 2-8),
- Power Supply Adapter (100-240VAC to 24VDC +/-10%) (see Fig. 2-8),
- A CD with DLL and firmware,
- Software user guide,
- Operation Manual,
- Qualification Test report.
Fig 2-5: CLS deliverables

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Fig 2-6: CHRocodile CLS unit 3D view: a- Straight version b- Right angled version
Fig 2-7: Optical Head 3D view: a- CLS0.2 b- CLS1 c- CLS2.3 d- CLS4
Fig 2-8: Set of electrical cables: a- Power supply b- Adapter
a- b-

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2.6 Connections and Interfaces
All of the connection ports for the sensor unit are located at the rear of the system (see Fig 2-9):
1. ON / OFF Switch button,
2. Power supply jack
3. Serial interface RS232, USB port,
4. Ethernet interface, RJ45 port
5. Encoder-Input, Sub-D26 male connector
6. Trigger Input/Output + RS422, Sub-D15 female
connector
7. Status LED
Fig. 2-9: CHRocodile CLS rear panel: Connections
2.6.1 ON / OFF Switch button
The CHRocodile CLS has a Power switch ON / OFF button.
2.6.2 Power supply jack
The CHRocodile CLS has two pluggable screw terminal for power supply with 24VDC +/-10%.
Connect the set of power cable supply associated to the Power Supply Adapter (100-240VAC to
24VDC +/-10%) delivered with the CHRocodile CLS unit.
1
6
2
5
3
4
7