OTC-239
THERMOPILE INFRARED SENSOR
▓
Features
The thermopile sensor consists of a series of 44 thermoelements, forming a
sensitive area of 0.5 x 0.5 mm
2
. The sensor is hermetically sealed into a TO-
18 metal housing, with optical filter. This standard filter allows measurements
to be made in the spectral range above 5 µm wavelength. The thermosensor
exhibits an almost white noise, comparable to an ohmic resistance. It has a
constant signal versus frequency up to its frequency limit, and is directly
proportional to incident radiation. The thermopile sensors are featured with an
additional thermistor on the same package. The standard version of thermistor
is housing conneccted to ground.
▓
Applications
* Ear thermometers; clinic thermometers
* Infrared thermometers
* Consumer applications: hair dryer, micro-wave oven, air conditioner,
refrigerator
* Continuous temperature control of manufacturing
* Security system
* Radiation monitor switch system
* Absorbing measurement for gas analysis
* Thermoelectric converter
* Heat flux flowmeter
▓
Electrical Characteristics
ROITHNER LASERTECHNIK
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Tel. No.
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:
:
:
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:
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Parameter
Thermopile
Number of thermojunctions
Chip size
Active area
Condition
Min.
Typ.
Max.
Unit
---
---
Interference
layer
Silicon-
substrate
25 °C
With 5-14 µm
filter
---
44
1920 x 725
500 x 500
---
---
---
µm
2
µm
2
Thickness of substrate
Resistance of thermopile
Sensitivity
Detecctivity
Time Constant
Noise voltage
NEP
Temperature range
Temperature reference resistor
Resistance (1)
Resistance (2)
Βvalue
(1)
Βvalue
(2)
600
60
45
4*10
7
---
---
---
625
70
55
7*10
7
30
34
0.8
---
650
80
65
9*10
7
---
---
---
100
---
µm
KOhm
V/W
cm*Hz
1/2
/W
ms
nV/Hz
1/2
nW/Hz
1/2
°C
Operation
-20
25 °C
25 °C
0
o
C/25 °C
0
o
C/25 °C
29.1
97
3773
3950
30.0
100
3811
3970
30.9
103
3849
3990
KOhm
KOhm
K
K
Measured at 1 Hz chopper frequency, within spectral range 5-14 µm, using a
blackbody radiator of 500 K temperature.
Note : Thermistor should be operated under 1 mA.
▓
Thermopile voltage vs. blackbody temperature
ROITHNER LASERTECHNIK
Address
Tel. No.
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E-Mail
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:
Schoenbrunner Str. 7, 1040 Vienna, Austria
43-1-586 52 43-0
43-1-586 52 43-44
office@roithner-laser.com
www.roithner-laser.com
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▓
Frequency response
▓
Field of view
ROITHNER LASERTECHNIK
Address
Tel. No.
Fax No.
E-Mail
http
:
:
:
:
:
Schoenbrunner Str. 7, 1040 Vienna, Austria
43-1-586 52 43-0
43-1-586 52 43-44
office@roithner-laser.com
www.roithner-laser.com
page : 3 / 7
▓
Thermistor vs. temperature
The resistance of the temperature reference resistor varies with temperature
and the behaviour is illustrated in the following figure.
At temperature 25 °C, R(T)=R
25
e
1 1
−
β
T T
25
describes the resistance vs. temperature,
ROITHNER LASERTECHNIK
Address
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:
:
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:
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43-1-586 52 43-0
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www.roithner-laser.com
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where R
25
is the resistance at ambient temperature 25 °C and T, T
25
are the
ambient temperatures in unit of kelvin degrees.
Pin assignment & description
2
4
1
3
thermistor pin
thermistor pin (GND)
thermopile output pin (+)
thermopile output pin (-)
Thermistor
Thermopile
▓
2(R)
3(V-)
1(V+) 4(GND)
BACKSIDE VIEW
SIDE VIEW
▓
Order information : OTC-239-A
A
:
1
2
:
:
standard filter (5-14 µm)
silicon filter with flat band transmission
ROITHNER LASERTECHNIK
Address
Tel. No.
Fax No.
E-Mail
http
:
:
:
:
:
Schoenbrunner Str. 7, 1040 Vienna, Austria
43-1-586 52 43-0
43-1-586 52 43-44
office@roithner-laser.com
www.roithner-laser.com
page : 5 / 7
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