Absolute type terahertz radiometer

A terahertz radiation and terahertz technology, which is applied in the field of terahertz radiation parameter measurement, can solve the problems that the absorption rate cannot be accurately evaluated and the absorption rate cannot be accurately measured, and achieve the effects of flat absorption spectrum, improved accuracy, and improved absorption rate

Active Publication Date: 2014-06-18
NAT INST OF METROLOGY CHINA
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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, po

Method used

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  • Absolute type terahertz radiometer

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Embodiment Construction

[0023] see figure 1 As shown, the present invention provides an absolute terahertz radiometer for measuring electromagnetic radiation power in the terahertz band, calibrating a terahertz detector or calibrating a terahertz power meter, including:

[0024] A heat sink 10, the heat sink 10 maintains a stable temperature and is used as a reference background temperature for temperature difference measurement, and the material of the heat sink 10 is steel, iron, aluminum or copper;

[0025] A thermopile 20, as a temperature difference measurement sensor, a temperature measuring surface of the thermopile 20 is bonded on the heat sink 10 with heat-conducting glue; the thermopile 20 converts the temperature difference signal into an electrical signal for the measurement of the display instrument, the The thermopile 20 is a thermocouple or other types of temperature difference measurement sensors or temperature measurement sensors;

[0026] An electric heating layer 30, the electric ...

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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...

Claims

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Application Information

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IPC IPC(8): G01J1/42
Inventor 邓玉强孙青于靖
Owner NAT INST OF METROLOGY CHINA
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