Thermopile detectors

2nd March 2023

Sheryl Miles

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LASER COMPONENTS is pleased to represent Dexter Research Centre, specialists in the manufacturing of stable, high quality, high output radiation sensing thermopile detectors with a linear dynamic range from the UV to long wave IR.

Thermopile detectors are passive radiation sensing voltage-generating devices that require no bias or cooling and do not emit any radiation.

Spectral sensitivity is defined by the selection of optical band-pass filters, with dozens of options available. Thermopile output is generally in the micro-Volt to milli-Volt range depending on target size, temperature, and radiance.

Thermopile detectors generate no 1/ƒ or microphonic noise, but only the Johnson noise of their resistance. Additionally, thermopile detectors provide a stable output for DC radiation up to a frequency limited by the time constant. Unlike pyroelectric detectors, no chopper or modulation is required.

Applications are broad and include the following:

hand-held non-contact temperature measurements
non-contact temperature measurements in industrial applications and process control
infrared radiometry
automotive exhaust gas analysis of CO, CO2, & HC
medical gas analysis including anaesthetic, incubator CO and CO2, blood alcohol breathalysers
fire detection
blood glucose monitoring
human presence and detection
custom sub-assemblies including mechanics and PCB’s