optris BR 20AR User manual

Operators Manual
BR 20AR
Ambient temperature reference source

Optris GmbH
Ferdinand-Buisson-Str. 14
13127 Berlin
Germany
Tel.: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: www.optris.global

-Table of contents 3-
Table of contents
Table of contents.........................................................................................................................................3
1General notes.......................................................................................................................................5
1.1 Intended use..................................................................................................................................5
1.2 Warranty ........................................................................................................................................6
1.3 Scope of supply .............................................................................................................................6
2Technical Data .....................................................................................................................................7
2.1 BR 20AR........................................................................................................................................7
3Installation......................................................................................................................................... 10
3.1 Hardware installation .................................................................................................................. 10
3.2 Configuration .............................................................................................................................. 17
3.3 Accessories................................................................................................................................. 22

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4Fever Detection................................................................................................................................. 23
4.1 Crowd based screening.............................................................................................................. 23
4.2 Individual screening.................................................................................................................... 23
4.3 Absolute temperature measurement accuracy........................................................................... 24
4.4 Deployment of an IR camera for best results ............................................................................. 25
4.5 Influences on external skin temperatures................................................................................... 26

-General notes 5-
1 General notes
1.1 Intended use
Thank you for choosing the optris®BR 20AR reference source.
The BR 20AR is a rugged reference source and ideally suited for referencing thermal imaging cameras. It
contains two main components:
Radiation surface
Temperature probe (16-bit digital temperature sensor with 0.1 °C accuracy)
The radiation surface is made of aluminium with a special thermal conductivity and has shaped grooves. The
BR 20AR is floating with the ambient temperature. The temperature is measured with a higher precision
temperature probe.
To avoid a damage of the special coating, please do not touch the radiation surface with
sharp or spiky objects.
Read the manual carefully before the initial start-up. The producer reserves the right to change
the herein described specifications in case of technical advance of the product.

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1.2 Warranty
Each single product passes through a quality process. Nevertheless, if failures occur please contact the
customer service at once. The warranty period covers 24 months starting on the delivery date. After the
warranty is expired the manufacturer guarantees additional 6 months warranty for all repaired or substituted
product components. Warranty does not apply to damages, which result from misuse or neglect. The warranty
also expires if you open the product. The manufacturer is not liable for consequential damage or in case of a
non-intended use of the product.
If a failure occurs during the warranty period the product will be replaced, calibrated or repaired without further
charges. The freight costs will be paid by the sender. The manufacturer reserves the right to exchange
components of the product instead of repairing it. If the failure results from misuse or neglect the user has to
pay for the repair. In that case you may ask for a cost estimate beforehand.
1.3 Scope of supply
BR 20AR radiator
Mounting bracket
20 m cable with PIF connector
Operators manual

-Technical Data 7-
2 Technical Data
2.1 BR 20AR
Dedicated temperature range
18 °C –33 °C
Emissivity
0,95 ± 0,02 (for 8-14 µm)
Temperature probe (integrated)
Digital 16-bit temperature sensor
Accuracy of temperature probe
± 0.1 °C (25…50 °C), drift: 0,0073 °C
Accuracy of PI 450i with BR 20AR
(TAmb 18 °C…33 °C)
± 0.5 °C (TObj 30…40 °C)
Interface
5-pin connector fitting to PIF connector of PI 450i cameras
Dimensions
20 cm x 20 cm x 5,8 cm
Weight (with mounting bracket/
without cable)
2,5 kg
Material
Radiation surface: anodized aluminium
Back: stainless steel
Table 1: Technical Data of BR 20AR

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Figure 1: Dimensions [mm], ceiling mounting

-Technical Data 9-
Figure 2: Dimensions [mm], wall mounting

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3 Installation
3.1 Hardware installation
A possible configuration of the BR 20AR is shown in Figure 4. The optris
PI 450i T010 camera is connected via USB to the computer. The included
20 m cable has to be connected to the PIF connector on the camera back
side (see Figure 3). There is no power supply necessary for the
BR 20AR.
Hardware and Software Recommendation:
Computer with OS Windows 7 or higher
Optris PI 450i T010 camera and PIX Connect Software Version
3.9.3063.0 or higher
Figure 3: Connection
Note:
The camera must be focused
Consider the minimum distance of the selected optics
The reference source must not be obscured by other objects

-Installation 11-
Figure 4: System overview with PI 450i camera

-12 -
The BR 20 radiator can be mounted either on a ceiling or on a wall. An advantage of the radiator is its size.
This means that it can be set up at almost any distance from the camera and the object to be measured. It is
only important that the reference measuring area has a minimum size of 8x8 pixels and that the radiator is
within the field of view of the camera. The ambient temperature for the radiator should be the same as that of
the person to be measured. Installation close to a window or an air conditioning system should be avoided, as
the air flow can have an effect on the measurement.
The camera is focused on the person to be measured. If the radiator is at a great distance from the object, it
may also be out of focus in the image. This has no effect on the measurement, as it is an ambient radiator that
is in the same ambient temperature as the object. The person or persons to be measured must be within the
depth of field (DOF) range of the camera (Figure 5).
Figure 5: Depth of Field (DOV)

-Installation 13-
For optimal temperature measurement of the skin, the area
of the medial canthus is recommended (Figure 6). At this
point there is a very good correlation to the body core
temperature.
Figure 6: Medial canthus
In Figure 7 the face of a person was measured with an
infrared camera. The medial canthus is highlighted in red. In
this example the temperature of 35.1 °C is significantly higher
than the average temperature of the face (T=33.7 °C).
Figure 7: IR image –Medial canthus

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The temperature distribution in
the face is in this example
between 31 °C and 35.1 °C
(Figure 8). The size of the
canthus is approximately
assumed to be 15x15 mm.
Figure 8: Temperature distribution face
To achieve the minimum temperature accuracy requirement, there must be at least 3x3 pixels within the
Canthus region (15x15 mm).
The following tables show the DOF ranges and the number of pixels in the canthus for the different available
optics depending on the distance.

-Installation 15-
O18, 382 x 288 px
Distance
[m]
Field of view:
HFOV [m]
Pixel inside canthus
(15x15 mm)
Depth of field: DOF [m]
for 3x3 px
1.5
0.5
12 x 12
0.7
3.0
1.0
6 x 6
3.0
6.0
2.0
3 x 3
34.0
O29, 382 x 288 px
Distance
[m]
Field of view:
HFOV [m]
Pixel inside canthus
(15x15 mm)
Depth of field: DOF [m]
for 3x3 px
1.0
0.5
12 x 12
0.5
2.0
2.0
6 x 6
3.0
4.0
4.0
3 x 3
infinite
O53, 382 x 288 px
Distance
[m]
Field of view:
HFOV [m]
Pixel inside canthus
(15x15 mm)
Depth of field: DOF [m]
for 3x3 px
0.5
0.5
14 x 14
0.5
1.0
1.0
7 x 7
5.0
2.0
2.0
3 x 3
infinite

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O80, 382 x 288 px
Distance
[m]
Field of view:
HFOV [m]
Pixel inside canthus
(15x15 mm)
Depth of field: DOF [m]
for 3x3 px
0.3
0.5
15 x 15
0.3
0.6
1.0
8 x 8
5.3
1.2
2.0
4 x 4
infinite
The following table shows the recommended installation area.
Lens
Recommended working range for
screening [m] (Distance Camera - Person)
Recommended working range for reference [m]
(Distance Camera - BR20)
min
max
min
max
O18
3
6
3
20
O29
2
4
2
18
O53
1.0
2
1
11
O80
0.6
1.2
0.6
7
The O18 or O29 optics are recommended for temperature measurement by individual screening
at the medial canthus. At least 3x3 pixels are required in the canthus area and the optimal FOV
width is 1 m.

-Installation 17-
3.2 Configuration
After having connected your Hardware, you can
start with the configuration in the PIX Connect
software. To do this, go to the Referencing tab
under Tools and Configuration. Under Reference
temperature and Source, select External probe.
Now select under Compare with measuring area
the measuring area that should correspond to the
reference area. This measuring area must be
located in the reference source. The remaining
options do not require further adjustments.
Figure 9: Configuration in PIX Connect software
The software already contains a predefined layout called "Fever Inspection with Ref". You can
load this layout under Tools and Load layout and use it as a presetting.

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Figure 10:Example layout in PIX Connect –Fever Inspection with Ref
To make a correct temperature measurement on the human face make sure that glasses of the
persons are removed and that the eyes are inside the measuring area.

-Installation 19-
The “Fever Inspection with Ref”layout consists of two measuring
areas. The first measuring area is the so-called "reference
source", which must be placed on the BR 20AR radiator. It is
important to cover a large area as possible, but not the edges
(see Figure 11). The minimum size should be at least 8x8 pixels.
The second measuring area ("Remove eyewear") must be
positioned so that the human face is captured. The emissivity of
the "reference source" does not have to be taken into account
further, as the ambient temperature is equal to the reference
source temperature. This can remain set at ε=1. The emissivity
of the object (here the human skin) should be set at ε=0.98.
Figure 11:Position of Reference
source
The window Temp. of measure area displays the current
maximum temperature value. As soon as this reaches the alarm
value, the color changes to red. This ensures that the alarm case
is clearly visible. In this case the threshold value is set to 36 °C.
The threshold value of the alarm must be adjusted for different
conditions.
Figure 12:Temp. of eeasure area

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In the snapshot history, all alarm cases are stored and can be
analyzed more precisely. A snapshot is taken for each alarm
condition. For this purpose, Snapshot on alarm selection must be
activated under Alarm configuration in the Alarms tab.
Figure 13:Configuration –Snapshot on alarm
Figure 14:Snapshot history
The reference bar shows the scaling of temperature within the color palette. The threshold value can be
changed directly here.
Figure 15:Reference bar