Absolute type terahertz radiometer

Abstract

An absolute type terahertz radiometer comprises a heat sink, a thermopile, an electric heating layer, silicon carbide particles, a black paint mixed coating, a hemispheric light collecting cover, a heat insulation cover, a pair of electric heating terminals and a pair of responding voltage measuring terminals. The thermopile, the electric heating layer, the silicon carbide particles and the black paint mixed coating are manufactured on the heat sink in sequence, the hemispheric light collecting cover covers the heat sink, and the thermopile, the electric heating layer and an absorption coating are all arranged in the light collecting cover, the heat insulation cover covers a whole radiometer body, the electric heating terminals are arranged outside the heat insulation cover, and are electrically connected with a heating lead of the electric heating layer, and the responding voltage measuring terminals are arranged outside the heat insulation cover and are electrically connected with an inductor lead of the thermopile. The responding sensitivity of the calibration radiometer is replaced with laser power or electric power, therefore, terahertz radiant power (or energy) is tracked back to the international system of units, the terahertz radiant power (or energy) can be measured, and the measuring value of the terahertz radiometer can be calibrated and corrected.

Description

technical field [0001] The invention relates to the technical field of terahertz radiation parameter measurement, in particular to an absolute terahertz radiation power meter or a terahertz radiation energy meter. Background technique [0002] Terahertz refers to electromagnetic radiation with a frequency of 0.1-10THz, which is located in the band gap between optical infrared and electromagnetic millimeter waves on the electromagnetic spectrum. For a long time, due to the lack of effective generation and detection technology, terahertz has become the last window in the electromagnetic spectrum that humans have yet to understand. Since the 1980s, with the development of femtosecond pulsed laser technology, terahertz electromagnetic radiation with wide radiation bandwidth, high intensity and high signal-to-noise ratio has been produced at room temperature. Terahertz instruments have also gradually achieved low cost and miniaturization, and the application of terahertz technol...

AI Technical Summary

Problems solved by technology

However, the absorptivity of the absorbing coating of the cryoradiometer in the terahertz band cannot be accurately measured, so the cavity absorptivity of the absorbing cavity of the cryoradiometer in the terahertz band cannot be accurately evaluated

Although the uncertainty components of window transmittance, power drift, noise, polarization, and alternative detectors are only a few thousandths, since the uncertainty of the cavity absorptivity is rated at 7%, it can only give 7.3 % combined uncertainty (including the factor k=1), where the cavity absorptivity becomes the largest component in the uncertainty combination

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