Broadband terahertz source radiant power calibration device and method

A terahertz radiation source, radiation power technology, applied in the direction of using the method of comparing with reference electrical parameters, etc., can solve the problem of reducing the measurement accuracy of terahertz radiation power, unable to realize the calibration of weak terahertz source radiation power parameters, pyrolysis Problems such as low responsivity of electrical detectors

Active Publication Date: 2015-06-17
西安应用光学研究所
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Problems solved by technology

[0004] However, the system is measured in an indoor environment, and the infrared stray background radiation interferes with the measurement, which reduces the measurement accuracy of the terahertz radiation power.

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  • Broadband terahertz source radiant power calibration device and method
  • Broadband terahertz source radiant power calibration device and method
  • Broadband terahertz source radiant power calibration device and method

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[0072] The present invention will be described in further detail below in conjunction with the drawings and preferred embodiments.

[0073] Such as figure 1 As shown, the preferred embodiment of the present invention includes a light source system 1, an optical system 2, a detection system 3, and a computer 4 equipped with a terahertz source radiation power calibration data processing software package.

[0074] The light source system 1 includes a standard terahertz radiation source, a low-temperature radiation black body, a calibration black body, and a terahertz source 1-6 to be measured. Further, standard terahertz radiation sources are divided into terahertz variable temperature blackbody 1-1 for providing weak terahertz radiation and terahertz Schottky magnification frequency source 1-5 for providing strong terahertz radiation, and low temperature radiation blackbody The blackbody 1-2 is cooled with liquid nitrogen that provides a low background radiation temperature of 77K. ...

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Abstract

The invention provides a broadband terahertz source radiant power calibration device and method. A terahertz source capable of being tested is a terahertz source with a light beam divergence angle larger than 1.732 degree and the spectral region ranging from 30 micrometer to 3000 micrometer. According to the broadband terahertz source radiant power calibration device and method, the measurement method that radiation parameters of a standard terahertz source are compared with radiation parameters of the to-be-tested terahertz source is adopted; after radiation of the standard terahertz source or the to-be-tested terahertz source enters a low temperature vacuum background channel through a terahertz transmission window, the radiation and background radiation of a liquid nitrogen refrigeration black body are alternatively modulated through a light chopper sheet into periodically-changed terahertz radiation signals, are gathered through a Cassegrain system, income a terahertz detector through a terahertz spectrum light filter, are converted into periodically-changed voltage signals, and are processed through a lock-in amplifier to obtain stable measuring voltage signals. The radiant power of the to-be-tested terahertz source is obtained through calculation according to the radiant power correction factors obtained by measuring a weak radiation source or a strong radiation source, and meanwhile the radiation luminance of the to-be-tested terahertz source can be obtained through calculation.

Description

technical field [0001] The invention belongs to the technical field of optical metrology, and mainly relates to a terahertz source radiation power calibration device, in particular to a broadband terahertz source radiation power calibration device and a calibration method. Background technique [0002] In recent years, terahertz technology has been a cross-cutting cutting-edge high-tech that has been researched at home and abroad, and has great application prospects in fields such as security inspection, anti-terrorism, deep space exploration, terminal communication, medicine, and material detection. Among them, the development technology of terahertz radiation source is included in the national key basic research plan. Accurate measurement of the radiation power of terahertz sources has become a key problem restricting the development, production and application of terahertz sources. Terahertz sources mainly include: terahertz black body, Schottky amplified frequency doubl...

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Application Information

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IPC IPC(8): G01J1/16
Inventor 杨鸿儒李宏光常伟军腾国奇汪建刚张博妮薛占理孙宇楠曹锋马世帮
Owner 西安应用光学研究所
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