ETC2 OTC-238 Thermopile infrared sensor Datasheet

OTC-238
THERMOPILE INFRARED SENSOR
Date : Oct. 10, 2000
▓
Features
The thermopile sensor consists of a series of 44 thermoelements, forming a
sensitive area of 0.5*0.5 mm2. 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 5µm 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.
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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
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Electrical Characteristics
Parameter
Condition
Min.
Typ.
Max.
Unit
Number of thermojunctions
---
44
---
Chip size
---
1920*1725
---
µm2
---
500*500
---
µm2
Thermopile
Active area
Interference
layer
Thickness of substrate
Siliconsubstrate
600
625
650
µm
Resistance of thermopile
25
60
70
80
KΩ
Sensitivity
With 5-14µm
filter
40
55
70
V/W
4*107
7*107
9*107
cm*Hz1/2/W
Time Constant
---
30
---
ms
Noise voltage
---
34
---
nV/Hz1/2
NEP
---
0.8
---
nW/Hz1/2
-20
---
100
Detecctivity
Temperature range
Operation
Measured at 1 Hz chopper frequency, within spectral range 5-14µm, using a
blackbody radiator of 500K temperature.
▓
Thermopile voltage vs. blackbody temperature
▓
Frequency response
▓
Field of view
▓
Pin assignment & description
1
thermopile output pin (+)
3
thermopile output pin (-)
Thermopile
2(R)
3(V-)
1(V+) 4(GND)
BACKSIDE VIEW
SIDE VIEW
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Order information : OTC-238-A
A
▓
:
1
:
standard filter (5-14µm)
2
:
silicon filter with flat band transmission
Transmission of filter
Transmission of optical filter is measured by FTIR from 2µm
▓
Package
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 5µm wavelength. The dimensions of header and cap are shown
below.
Unit: mm
4.7000
CHIP
CAP
3.6
HEADER
2.0
3.0000
WINDOW
IR FILTER
0.43
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Application circuit
Circuit 1 :
+5V
C1
R1 Thermopile
R4 +
R2
1
C3 R5
3
2
4
Vout
+
OP
R6
C6
C4
C5
Reference
Resistor
R3
C2
Circuit 2 :
Ambient Temperature
Compensation Circuit
Pre-Amplification Circuit
+5V
R10
+
A2
Thermopile (+) -
+5V
Adder
C1
C3
+
A1
-
Thermopile (-)
R13
R11
1 +
3 -
R1
R2
Vout
R7
2
4
+
A3
-
R8
C2
reference
resistor
R9
R12
C4
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