ETC2 OTC-236-11 Thermopile infrared sensor Datasheet

OTC-236
THERMOPILE INFRARED SENSOR
▓
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-5
metal housing, with an 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.
▓
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
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 °C
60
70
80
KOhm
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
°C
Detecctivity
Temperature range
Operation
Measured at 1 Hz chopper frequency, within spectral range 5-14 µm, 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
▓
Order information : OTC-236-AB
A
B
▓
:
:
1
:
standard filter (5-14 µm)
2
:
silicon filter with flat band transmission
1
:
window size = 2.57mm (diameter)
2
:
window size = 3.80mm (diameter)
Transmission of filter
Transmission of optical filter is measured by FTIR from 2 µm
▓
Package
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 µm wavelength. The dimensions of header and cap are shown
below.
OTC-236-11
Unit: mm
ψ8.15
2.00
ψ5.4
4.6
ψ2.57
Chip
Cap
Header
0.43
Window
Window
IR Filter
IR
filter
OTC-236-12
Unit: mm
8.17
Chip
Cap
2.00
4.6
ψ3.8
WIindow
Windo
filter
IR
▓
Application circuit
0.43
Header
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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