A thermal radiometer is a detector used to measure infrared radiation. They are highly sensitive to thermal radiation and are mainly used in infrared spectra ranging from 10 to 5000 µ m (30THz to 60GHz).

The detector component is a highly sensitive thermistor that is cooled to LHe temperature in order to reduce the thermal background.

Any thermal radiation that impacts the detector will cause a temperature change, which will result in a change in resistance. This change in resistance is amplified and measured as a voltage difference.

Due to the measurement of temperature changes by a bolometer, it is necessary to modulate the incident radiation.

This enables the bolometer to excite and relax, thus enabling the measurement of resistance changes corresponding to incident radiation energy.

Application:

Parameter specifications:

General 4.2K system:

Our most popular and versatile radiation thermal measurement system also covers a wide range of applications.

It consists of a 4.2K radiation heat detector element connected to a 2.5mm diamond absorber.

It works best in the range of 15 to 2000 µ m (20THz to 150GHz), with modulation frequencies in the range of 200 to 400Hz.

Standard 1.6K system:

Similar to our universal 4.2K system, its spectral response (15 to 2000 µ m) has the additional advantage of reducing detector temperature.

These benefits include lower NEP, higher sensitivity, and the advantage of fast response time. The system can operate at modulation frequencies greater than 1 KHz.

HI-RES4.2K system:

This system provides a lower thermal conductivity detector and higher spectral resolution. This configuration provides a system with slower response speed, and it is best to keep the modulation frequency below 200Hz.

This system is more sensitive, with a NEP value one order of magnitude lower than the general 4.2K system.

Far infrared 1.6K system:

Specially configured to detect low-energy signals present in longer wavelengths of the infrared spectrum, and performs well in the range of 300 µ m to 5mm.

Compared to our other radiation heat measurement systems, its thermal conductivity is very low. This helps to provide longer time to capture low signal strength and is best operated at modulation frequencies below 300Hz