Jenoptik VARIOSCAN high resolution Series User manual

VARIOSCAN high resolution
Models 3021, 3021-ST
and 3022
Manual
JENOPTIK Group.
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Dear Customer
To fully exploit the capabilities of the VARIOSCAN high resolution
Thermography System, please read this manual thoroughly.
Only then you can be sure to fully exploit the capabilities of your
new thermographic system.
The equipment is subject to change without notice due to
continuous product improvement.
Copy deadline: July 2000
Publication No.: 667917-005-98-02-0500-en
JENOPTIK Laser, Optik, Systeme GmbH
Camera Systems
D -07739 Jena
Telephone: [phone]
Fax: [phone]
CE
Note
No part of this manual may be reproduced in any way (printed, copied,
photocopied, microfilmed), or processed and duplicated by any electronic
system or disclosed to third parties without the prior written consent of
JENOPTIK Laser, Optik, Systeme GmbH. The manual has been written with
due care.
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The manufacturer will not accept any liability for damages caused by
nonobservance of the information given in this manual.
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Contents
1Introduction ....................................................................................... 5
2Notes on Instrument Safety ................................................................ 6
3Technical Description......................................................................... 8
3.1 Instrument features ............................................................................ 8
3.2 Specifications ...................................................................................11
4Unpacking and checking the equipment .............................................15
5Handling the camera.........................................................................16
6Installation........................................................................................17
7Connection to an external PC............................................................20
8Operation.........................................................................................21
8.1 Recording mode...............................................................................21
9Temperature measurement ...............................................................50
9.1 General............................................................................................50
9.2 Measurement principle......................................................................51
10 Maintenance.....................................................................................54
10.1 Routine maintenance........................................................................54
10.2 Other maintenance work ...................................................................54
11 Service.............................................................................................56
12 Declaration of EC Conformity ............................................................57
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Contents
5
1Introduction
The VARIOSCAN high resolution Thermography System is avaiable in
different versions:
qModel 3021
nitrogen cooled,
wavelength range 8 -12 µm
germanium optics.
qModel 3021 -ST
Stirling cooler,
wavelength range 8 -12 µm
germanium optics.
qModel 3022
thermoelectrically cooled,
wavelength range 2 -5 µm,
silicon optics.
The software offered for each model includes a model-specific dataset
that is specially customised to the camera head. This dataset cannot be
transferred to any other VARIOSCAN system.
Main applications are:
qBuilding thermography,
qLeakage detection,
qPreventive maintenance in industry, quality assurance and
production inspection,
qBiotechnology and environmental engineering.
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NotesonInstrumentSafety
6
2Notes on Instrument Safety
The VARIOSCAN high resolution is a high-guality, carefully calibrated
instrument. The casing of the camera head may be opened only by our
service or other authorised persons. Unauthorised tampering with the
equipment will forfeit any rights to claim under warranty.
The use of accessories or spares on the VARIOSCAN high resolution
that have not been recommended expressly by JENOPTIK Laser,
Optik, Systeme GmbH may result in malfunction or damages. The
manufacturer will not assume any liability for such damage.
VARIOSCAN high resolution Model 3021
When handling liquid nitrogen, observe the statutory regulations acc. to
DIN 52900. The relevant rules of this standard are interpreted in
Section 6 of this manual. Never cover the safety hole of the Dewar cap.
lf not in the camera head, transport liquid nitrogen only in licensed
containers having a stable position on the transport vehicle.
lf you incline the camera head too much (>70°, approx.), nitrogen may
leak from the Dewar cap. Therefore, when the Dewar is fully filled with
nitrogen, transport the camera head only in upright position. The filling
volume of the Dewar is 0.5 l approximately (about 5 funnels full of liquid
nitrogen).
Also observe the “Caution” label on the rear of the camera head.
Caution!
Mounted to its original tripod and set up at the average eye height of
1.70 m, the VARIOSCAN camera head features a high stability against
tilting over into any direction (up to 10° inclination under a load of
160 N). Consider that the stability reduces with higher extension of the
tripod legs.
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NotesonInstrumentSafety
7
Caution!
When exiting the control software, the system will save certain settings.
Never switch off the camera while this process is going on.
Only use ATA-compatible memory cards on the PCMCIA drive of the
VARIOSCAN high resolution. Nonobservance may cause damages to
camera or memory card, for which we will not accept any liability.
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TechnicalDescription
8
3Technical Description
3.1 Instrument features
Detector
Window
Verticalscanner
Horizontal scanner
Aspheric
lens
Filter wheel
Chopper
PC/104Module
LCDdisplay
Fig. 1: Schematic diagram of camera head
VARIOSCAN high resolution is a thermographic system for the
wavelength ranges of 2 –5 µm (Model 3022) and 8 –12 µm (Model
3021). Thus the system covers both atmospheric windows.
The camera operates on the principle of object scanning. The object is
scanned through a two-dimensional reflecting scanner.
The horizontal scanner scans in lines, with 360 pixels each being
recorded at a frequency of 135 Hz. This scanner operates as a
resonance oscillator driven by a DC motor.
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TechnicalDescription
9
The vertical scanner builds up the complete image from the individual
lines. 240 lines can be captured at an image refresh rate of 1.0 Hz.
VARIOSCAN high resolution can also be operated with the following
resolutions (pixel x lines):
360 x 200
360 x 100
360 x 50.
The image information delivered by the scanner is focused onto the
detector through the aspheric imaging optics. The focal length of the
optics is 35 mm, its aperture is f :1. For focusing onto different object
distances, the imaging optics is moved axially covering a range from
0.2 m to infinity.
After every scanned image a reference source (chopper) is moved into
the optical path, and its temperature measured by a thermocouple. On-
line temperature measurement is made possible by comparing the the
radiation intensity of object and chopper.
Between imaging optics and detector, a filter wheel is located. The
wheel contains stops of different diameters that can be rotated into the
optical path at higher temperatures.
The employed object-side scanning method allows the use of an
electro-optical zoom function. This is achieved by varying the oscillation
amplitudes of the scanner reflectors. The maximum zoom possible is
6x.
On the Model 3021, MCT detectors are used having an edge length of
50 x 50 µm. The detectors are cooled by liquid nitrogen.
The metal Dewar vessels used have a hold time of 10 hours.
The Model 3021-ST works with an integrated Stirling cooler.
On the Model 3022, an MCT detector having an edge length of
100 x100 µm is used. These detectors are cooled by a three-stage
thermoelectrical cooling system. The output signal of the detector is
amplified and digitised, and transferred for further processing to the
PC-104 module.
The implemented control software controls all camera functions (see
Description of control software, Section 8).
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TechnicalDescription
10
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TechnicalDescription
11
3.2 Specifications
Camera 3021 3021 -ST 3022
IR detector MCT MCT MCT
Detector cooling Liquid nitrogen Stirling cooler thermoelectrical
Operating
wavelength range 8 –12 µm 8 –12 µm 2 –5 µm
Temperature
resolution
(30°C object
temp.)
± 0.003
Temperature
measuring range –40 ... + 1,200°C –40 ... + 1,200°C –10 ... + 1,200°C
Absolute accuracy
of temperature
measurement
(factory calibrated)
at an ambient
temperature of 22
± 2°C and ε= 1
<±2K
(measurement up to 100°C),
otherwise < ± 1% of full-scale value each
Scanned object
field 30° (H) x 20° (V)
Geometrical
resolution [mrad]
(K = 0.5) 1.5 1.5 3
Pixels per line360 (300)
Lines per image 240 (200, 100, 50)
Image rate [s] 1; 0.4; 0.2
(depending on number of lines)
Object distance 0.2 ... infinity
A/D conversion 16 bit
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TechnicalDescription
12
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TechnicalDescription
13
Camera 3021 3021 -ST 3022
Operating
temperature range –10°C ... +40°C
Dimensions
(L x W x H) [mm³] 240 x 192 x 200
Weight 5.1 kg 5.0 kg 4.7 kg
Display TFT display (active) 4.0"
Computer
hardware PC 104 module
386 SX 20 MHz,
8 MB DRAM
6MB flash memory
Image storage Internal flash memory, PCMCIA Memory
Card
Power supply Internal 12 V battery, external 12 V supply,
230 V power supply unit
Power
consumption 12 W 16 W 14 W
Functions Motorised focus, Autofocus, 6 zoom
stages;
3 colour and 2 B/W palettes
Max. 9 isotherms
Editable emission value
Multispot measurement ( max. 9)
Spot size 1 x 1 pixel ... 99 x 99 pixels
Storage/transporta
tion temperature
range –25°C ... +70°C (unpacked)
Max. relative
humidity for
storage 92% at 40°C
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TechnicalDescription
14
Total weight of
system in carrying
case approx. 11 kg
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Unpackingandcheckingtheequipment
15
4Unpacking and checking the equipment
The VARIOSCAN high resolution system is supplied in a carrying case.
The case contains the following components that are part of the
standard equipment:
1. Camera head
2. Nitrogen fill-in funnel (on Model 3021 only)
3. Power supply unit, charger for battery pack
4. Battery pack, 10.8V/3.9Ah
5. VARIOSCAN high resolution manual
On receipt of the VARIOSCAN high resolution, please check its
equipment for completeness and perfect condition of its components.
Inform your supplier immediately of any damages.
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Handlingthecamera
16
5Handling the camera
The VARIOSCAN high resolution is a high-quality optical measuring
instrument.
Handle it with due care and take care that its optical components do not
get dirty.
The instrument’s Enclosure Protection satisfies the requirements of
IP40. Use the instrument accordingly, i.e. protect it against dust and
rain.
The VARIOSCAN high resolution was tested in compliance with the
following standards:
qClimatic test acc. to DIN 58390 Part (2), (7)
qMechanical-dynamic load acc. to DIN 58390 Part (3)
qElectromagnetic Compatibility (EMC) acc. to EN 50082-2
(VDE 0839 Part 82-2)
The operating temperature range of the VARIOSCAN high resolution is
-10°C to + 40°C.
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Installation
17
6Installation
As the VARIOSCAN high resolution is a slow-scan system, you should
fix it for use to a tripod, carrying harness, transport carriage, or similar
support. For this, the bottom plate is provided with a 1/4“-20 mounting
thread (for setting a 3/8“-16 mounting thread remove the adapter).
Power supply
You can power the system either through power supply unit or
rechargeable battery. In addition, you can use any appropriate 12 V DC
source. When connecting it, observe correct polarisation. We
recommend you to use the rechargeable batteries available as
VARIOSCAN high resolution accessories.
Do not operate the system on a defective or insufficiently charged
battery.
Filling Dewar flask of camera head (Model 3021 only)
Caution!
When handling liquid nitrogen, observe the following safety rules:
Never store liquid nitrogen in tightly sealed containers. Keep it in
special containers fitted with a looseiy closing cap to allow any
generated gas to escape. ln this way, dangerous overpressure is
avoided. Avoid direct contact of skin or eyes with liquid nitrogen.
Otherwise serious frostbite will occur!
After filling the Dewar flask of the camera head with nitrogen, close the
filling hole again.
Take care that no foreign bodies get into the Dewar flask.
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Installation
18
How to fill the Dewar flask with liquid nitrogen.
qUnscrew the sealing cap on top of the camera head.
qUse the provided funnel and an auxiliary vessel to fill the Dewar
flask slowly with nitrogen.
Note:
qFirst fill in only a little amount of nitrogen to avoid boiling over. Fill
the flask completely only, after it has cooled down sufficiently.
qScrew the cap onto the filling hole. With a fully charged Dewar flask,
you can work for about 10 hours.
Operating the camera
qConnect power supply unit to camera head or push charged video
battery pack into the battery compartment of the camera until the
lock snaps in.
qTurn power switch on camera back to I(VARIOSCAN 3021, 3022)
or II (VARIOSCAN 3021-ST), the indicator LED on the display
lights. During hardware initialisation the display remains dark.
This process takes about 15 s. Subsequently, the software is
initialised. The display shows a corresponding message.
qSwitch position Ion VARIOSCAN 3021 -ST means on standby for
the internal Stirling cooler. The integrated PC is not running in this
mode.
qIf you want to work in the file system without online camera mode,
press the button at the bottom left.
qAfter initialisation, the camera is ready for taking thermograms.
qDirect the camera to a test object, for instance, a person.
qWait until detector has cooled down (on Model 3021-ST up to five
minutes).
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Installation
19
After these operations, the thermographic image of the selected object
becomes visible on the display. For this, the system uses factory-set
default parameters. (See also description of VARIOSCAN control
software.)
Test and check list
The instructions for the first use of the VARIOSCAN high resolution
thermographic system are based on basic settings that are necessary
to obtain a first thermographic image.
The test object used was a person. For objects of higher or lower
temperature, you must change the temperature level.
Please note that only a few basic settings are necessary to make a
thermographic image visible. For thermal measurements however,
additional items must be considered (cf. Section 9 -Temperature
measurement).
Before starting operation in normal mode, make sure the following
requirements are met:
1. Dewar flask is cooled down (only on Model 3021).
2. Cover of entrance window has been removed.
3. Power supply unit is connected or a charged battery inserted.
4. Power switch on camera back set to I(3021, 3022) or II
(3021-ST).
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ConnectiontoanexternalPC
20
7Connection to an external PC
VARIOSCAN high resolution contains an interface to a PC that can be
connected by an Ethernet-cable and a PC network card/PCMCIA
network card to a PC or notebook.
The Ethernet-connection allows complete remote control of
VARIOSCAN high resolution and on-line image capturing.
The required PC-software is available as an option.
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