Thermopile Infrared Sensor

Thermopile Infrared Sensor
▓
TP339
Features
The thermopile sensor consists of a series of 116 thermoelements, forming a sensitive
region size of 545 µm (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 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 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
ROITHNER LASERTECHNIK
Tel: 43-1-5865243-0
Fax: 43-1-5865243-44
http://www.roithner-laser.com
Microelectronics Dept.
2000.05
1/7
Thermopile Infrared Sensor
▓
TP339
Electrical Characteristics
Parameter
Condition
Min.
Typ.
Max.
Unit
Number of thermojunctions
---
116
---
Chip size
---
1740*1740
---
µm2
---
Diameter
545
---
µm
Thermopile
Active region size
Interference
layer
Thickness of substrate
Siliconsubstrate
600
625
650
µm
Resistance of thermopile
25 °C
50
65
80
KOhm
Sensitivity
With 5-14 µm
filter
70
85
100
V/W
1.0*108
1.3*108
Time constant
---
16
---
ms
Noise voltage
28
32
36
nV/Hz1/2
0.28
0.36
0.48
nW/Hz1/2
-20
---
100
°C
Detecctivity
NEP
Temperature range
Operation
1.7*108 cm*Hz1/2/W
---
Temperature reference resistor
Resistance (1)
25 °C
29.1
30.0
30.9
KOhm
Resistance (1)
25 °C
97
100
103
KOhm
value (1)
0oC/25 °C
3773
3811
3849
K
value (2)
0oC/25 °C
3950
3970
3990
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.
ROITHNER LASERTECHNIK
Tel: 43-1-5865243-0
Fax: 43-1-5865243-44
http://www.roithner-laser.com
Microelectronics Dept.
2000.05
2/7
Thermopile Infrared Sensor
TP339
▓
Thermopile voltage vs. blackbody temperature
▓
Frequency response
ROITHNER LASERTECHNIK
Tel: 43-1-5865243-0
Fax: 43-1-5865243-44
http://www.roithner-laser.com
Microelectronics Dept.
2000.05
3/7
Thermopile Infrared Sensor
▓
TP339
Field of view
339
▓
Thermistor vs. temperature
The resistance of the temperature reference resistor varies with temperature and the
behaviour is illustrated in the following figure.
ROITHNER LASERTECHNIK
Tel: 43-1-5865243-0
Fax: 43-1-5865243-44
http://www.roithner-laser.com
Microelectronics Dept.
2000.05
4/7
Thermopile Infrared Sensor
TP339
1 1 
 −

 T T25 
At temperature 25°C, R(T)=R25e
describes the resistance vs. temperature, where
R25 is the resistance at ambient temperature 25°C and T, T25 are the ambient temperatures
in unit of kelvin degrees.
▓
Pin assignment & description
2
thermistor pin
4
thermistor pin (GND)
1
thermopile output pin (+)
3
thermopile output pin (-)
Thermistor
2(R)
Thermopile
3(V-)
1(V+) 4(GND)
SIDE VIEW
BACKSIDE VIEW
▓
Order information : TP339 x
X
:
U
:
Standard filter (5-14 µm).
V
:
Silicon filter with flat band transmission.
ROITHNER LASERTECHNIK
Tel: 43-1-5865243-0
Fax: 43-1-5865243-44
http://www.roithner-laser.com
Microelectronics Dept.
2000.05
5/7
Thermopile Infrared Sensor
▓
TP339
Transmission of filter
Transmission of optical filter is measured by FTIR from 2 µm
▓
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 5 µm
wavelength. The dimensions of header and cap are shown below.
Unit: mm
4.7000
2.0
Chip
Cap
3.6
Header
3.0000
Window
IR Filter
0.43
ROITHNER LASERTECHNIK
Tel: 43-1-5865243-0
Fax: 43-1-5865243-44
http://www.roithner-laser.com
Microelectronics Dept.
2000.05
6/7
Thermopile Infrared Sensor
▓
TP339
Application circuit
Circuit 1 :
+5V
C1
R1 Thermopile
2
4
R2
+
-
1
C3 R5
3
Vout
+
OP
R6
C6
C4
R4
C5
Reference
Resistor
R3
C2
Circuit 2 :
Ambient Temperature
Compensation Circuit
Pre-Amplification Circuit
+5V
R10
+
A2
Thermopile (+) -
+5V
Adder
C1
C3
+
A1
-
Thermopile (-)
2
4
R11
1 +
3 -
R1
C4
Vout
R7
R13
+
A3
-
R8
C2
reference
resistor
R9
R12
R2
ROITHNER LASERTECHNIK
Tel: 43-1-5865243-0
Fax: 43-1-5865243-44
http://www.roithner-laser.com
Microelectronics Dept.
2000.05
7/7