Thermopile Infrared Sensor
Features
TP337
The thermopile sensor consists of a series of 116 thermoelements, forming a sensitive region
size of 545
m (diameter). The sensor is hermetically sealed into a TO-5 metal housing, with an
optical filter. This standard filter allows measurements to be made in the spectral range above 5
m 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
temperature reference resistor on the same chip. The standard version of temperature reference
resistor is housing connected 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
Thermopile Infrared Sensor
Electrical Characteristics
TP337
Parameter
Thermopile
Number of thermojunctions
Chip size
Active region size
Condition
Min.
Typ.
Max.
Unit
---
---
Interference
layer
Silicon-
substrate
25
With 5-14
m
filter
---
116
1740*1740
Diameter
545
625
60
85
1.3*10
8
16
31
0.36
---
---
---
---
m
2
m
Thickness of substrate
Resistance of thermopile
Sensitivity
Detecctivity
Time constant
Noise voltage
NEP
Temperature range
Temperature reference resistor
Resistance
600
50
70
1.0*10
8
---
28
0.28
650
70
100
1.7*10
8
---
33
0.48
100
---
m
K
V/W
cm*Hz
1/2
/W
ms
nV/Hz
1/2
nW/Hz
1/2
Operation
-20
25
29.1
3773
30.0
3811
30.9
3849
K
K
Temperature coefficient of resistance 25
Measured at 1 Hz chopper frequency, within spectral range 5-14
m, using a blackbody radiator of
500K temperature.
Note : Thermistor should be operated under 1mA.
Thermopile Infrared Sensor
Thermopile voltage vs. blackbody temperature
TP337
Frequency response
Thermopile Infrared Sensor
Field of view
1) window size: 2.57mm (diameter)
337A
TP337
2) window size: 3.80mm (diameter)
337E
Thermopile Infrared Sensor
Thermistor vs. temperature
TP337
The resistance of the temperature reference resistor varies with temperature and the behaviour is
illustrated in the following figure.
At temperature 25
, R(T)=R
25
e
describes the resistance vs. temperature, where R
25
is
the resistance at ambient temperature 25
and T, T
25
are the ambient temperatures in unit of kelvin
degrees.
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