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Thermopile Detector / Radiometer
Temperature Sensor Module

Electrical Optical Components offers high performance thermopile detectors as well as IR sources.

Detectors that measure radiation by means of the change of temperature of an absorbing material are classified as thermal detectors. Thermal detectors respond to any wavelength radiation that is absorbed and can be made to respond over a wide range of wavelengths.
  • One of the most common thermal detectors used in the infrared (IR) applications is the thermopile.
  • The most sensitive thermopile (higher Detectivity) is made from bismuth-antimony (BiSb) instead of silicon.


Infrared filters
Infrared Pulsed IR Sources

Thermopile detectors are voltage-generating devices, which can be thought of as miniature arrays of thermocouple junctions.

Applications include:

  • Non-contact temperature measurement
  • Spectrometers
  • Tympanic thermometers
  • Gas analysis
  • Process temperature monitoring
  • Fire & flame Detection
  • Household appliances
  • Explosion detection
  • Radiometers
  • Presence monitor
  • Far Infrared (FIR) detection up to 300μm and beyond
Each channel of the thermopile detector is fitted to the application by using an infrared filter or window. EOC has a broad selection of Standard Filters and Windows for these applications. Custom Filters and windows are also available.

To avoid damaging thermopile detectors during soldering and cleaning, consider using sockets.


Model Channels Detector Size
Aperture Size mm Thermistor Noise Equivalent Power nV/Hz1/2 Detectivity
*10 8th/cmHz1/2W
Time Constant ms Junctions Package
Single Channel Thin Film Technology (BiSb) Thermopile Detectors
TS1x200B-A-D3.55- 1 1.2x1.2 Ø3.55 Y 0.33 3.6 30 200 TO39
TS1x200B-B-D2.4- 1 1.2x1.2 Ø2.4    0.33 3.6 30  200 TO46
TS1x80B-A-D0.48- 1 Ø0.5 Ø0.48 Y  0.06  7.2 40  80  TO39
TS1x80B-A-D0.75- 1 Ø0.5 Ø0.75   0.06  7.2 40 80 TO39
Far Infrared (FIR) BiSb Thermopile Detectors
TS1x72B-A-D2.5-Kr-  1 Ø0.5  Ø2.5 Y  0.26  3.44 35 72  TO39

Multi-Channel Thin Film Technology (BiSb) Thermopile Detectors

TS2x200B-A-S1.5- 2 1.2x1.2 1.5x1.5 Y 0.33 3.6 30 2x200 TO39
TS4x200B-A-S1.5- 4 1.2x1.2 1.5x1.5 Y 0.33 3.6 30 4x200 TO39
TS4xQ200B-A-S1.5- 4 1.2x1.2 1.5x1.5 y 0.41 2.95 30 4x200 TO39
TS8x200B-TO8-S1.5- 8 1.2x1.2 1.5x1.5 Y 0.33 3.6 30 8x200 TO8


Technical Notes:
Thermopile Properties & Applications
Backfill Gas Influence on Sensitivity
Detector Options influence on Detector Performance
NDIR Gas Detection
Standard Thermistors
Detector Performance Terminology
  Detector Options:
Standard Infrared Filters and Windows
Custom Infrared Filters & Filter Sizes
NDIR Filter Requirements
Standard Thermistors