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Thermopile Detectors

Every object radiates heat in the form of electromagnetic waves with the wavelength of the light emitted depending on temperature. Radiation generated at longer wavelengths is associated with colder objects. Measuring the energy emitted into space allows the temperature of the target to be established without ever having to touch it. Thermopile detectors are ideal for this application with high temperature stability, excellent signal to noise and low cost. LASER COMPONENTS has been working with Dexter Research Centre, a world leading manufacturer of thermopile detectors.

Figure (1) illustrates the layout of a typical thermopile detector manufactured by Dexter. The sensor consists of a series of hot and cold junctions forming a thermocouple array mounted on a ceramic substrate which contains an aperture. Alternating n- type and p-type material connect the junctions together. The cold junctions are in thermal contact with the detector housing and are distributed around the perimeter of the substrate opening. The hot junctions define the active area of the sensor and are coated with an energy absorber. They are located in the centre of the detector and are supported on a thin membrane, thermally isolating them from the rest of the package.

The voltage generated is proportional to the temperature gradient between junctions and, unlike pyroelectric detectors, thermopiles are inherently low noise producing no 1/f or microphonic noise. In addition, thermopile detectors provide a stable output for DC radiation up to a frequency limited by the time constant of the sensor.

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Edward Williams
Technical Sales Engineer
Edward Williams
LASER COMPONENTS (UK) Ltd.
CM2 7PR Chelmsford Essex

LASER COMPONENTS UK - Your competent partner for optical and optoelectronic components in the United Kingdom.

Welcome to LASER COMPONENTS UK Ltd., your expert for photonics components. Each product in our wide range of detectors, laser diodes, laser modules, optics, fiber optics, and more is worth every Pound (£/GBP). Our customized solutions cover all conceivable areas of application: from sensor technology to medical technology. You can reach us here:

Goldlay House, 114 Parkway
Chelmsford Essex CM2 7PR
United Kingdom

Phone: +44 1245 491 499
Email: info(at)lasercomponents.co.uk

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Edward Williams
Technical Sales Engineer
Edward Williams
LASER COMPONENTS (UK) Ltd.
CM2 7PR Chelmsford Essex
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Goldlay House, 114 Parkway
Chelmsford Essex CM2 7PR
United Kingdom

Phone: +44 1245 491 499

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