INSTITUTE OF PHOTONIC
TECHNOLOGY
P.O. Box 10 02 39
D - 07702 Jena, Germany
Dept. of Quantum Detection
Phone: +49-3641-206 365
Fax:
+49-3641-206 199
e-mail: [email protected]
internet: http://www.ipht-jena.de
MINIATURIZED THERMAL
RADIATION
S ENSOR
TS-144
FEATURES









High Responsivity
Rugged Construction
Low Cost
Broad Spectral Response in the IR
Self-Generating Voltage
No Bias Required
No 1/f Noise
Ambient Temperature Operation
High Reliability
Hermetically Sealed
Excellent Long-Term Stability
TECHNICAL DESCRIPTION
The sensor model TS-144 is a miniaturized multijunction thermopile made by modern thin-film
technology on Si wafers. It consists of 144 rectangularly arranged junction pairs formed from evaporated
antimony and bismuth thin films. The centrally located active (hot) junctions comprising the active area
of 4 mm2 are blackened by metallic smoke or an interference absorption multilayer system.
The element is hermetically sealed in a small modified TO-5 package under an inert gas atmosphere. In
the case of the metallic smoke absorbing layer the thermopile sensor's broad and flat spectral response
from UV to far IR is limited only by the transmission characteristics of the window material selected.
Standard window material is a Si bandpass filter 8 ... 14 µm, other materials on request. In case of an
interference absorbing layer the spectral range is restricted to 3.0 ... 5.0 µm or 5.5 ... 13 µm, respectively.
The output e.m.f. of the sensor is proportional to the temperature difference between the active and the
reference junctions. The thermopile requires no cooling and no bias voltage or current for operation. It
generates no 1/f noise but only the thermal resistance (Johnson-Nyquist) noise. The sensor can be used
for DC and low frequency AC measurements.
The model TS-144K is a compensated variant of the model TS-144 with all the same parameters. It
contains additionally a contact temperature sensor (e.g. a NTC or a PTC resistor, respectively) near the
thermopile reference junctions for compensation ambient temperature changes - 20 ... 85 °C by including
this additional sensor in a special external circuit.
TYPICAL SPECIFICATIONS TS-144
This data sheet may be modified at any time
Active Area
Number of Junctions
Resistance
Resistance TC
Noise Voltage
Max. Irradiance
Filling Gas
DC Responsivity
Responsivity TC
DC Output @ 38 µW/mm2
Time Constant
D* (500 K, DC)
1)
room temperature (300K)
2)
other filling gases:
TS-144-2011-10-28.DOC
mm2 (mm x mm)
k
%/K
nV/Hz1/2
mW/mm2
V/W
%/K
mV
ms
cmHz1/2/W
He, Ne, Xe, Ar
Spectral Response:
Case
Operating Temperature
Weight
KRS-5
CaF2
Quartz
Glass
Silicon
BP Filter
LWP Filter
Sapphire
Useful Spectral
Range (µm)
0.6 ... 42
0.2 ... 9
0.2 ... 3
0.4 ... 2
1.1 ... 15
8.0 ... 14
7.2 cut-on
0.2 … 5
N2 2)
Krypton 2)
3)
25
45 3)
-0.35...-0.40
3.8 3) 4)
6.8 3) 4)
Typ. 50
Typ. 100
3.9 x 108 3)
6.8 x 108 3)
3)
ideal window (transmittance=1)
4)
500K
Normally flat in the selected spectral range
(dependent on Window Material)
Restricted ranges 3.0 - 5.0 µm or 5.5 - 13 µm with
special Interference Layers and increasing of the Time
Constant
Window Materials
Window
Material
4 (2 x 2)
144
7 - 13
-0.02 ... -0.04
 13 1)
12
Standard: 8 ... 14 µm Filter
Other Materials on Request
TO-5 Package (modified)
- 20 ... + 85 °C
2g
Transmission (%)
70
90
90
90
< 55
< 75
< 75
< 70
+Sb
-Bi
ø
.0
5
1
0
±
.2
9
ø
5
0
±
.1
8
ø
2
±
.0
4
ø
b
0
.2
5.0+0.15
1
±
0
.7
1
.5
5
±
2
.0
APPLICATIONS
13..15
5
.4
0
ø
- Non-Contact Temperature Measurements
- Radiometry
- Imaging System Requiring 2 mm x 2 mm Size
TS 144.SKD
all dimensions are given in mm