Thermal radiation detecting in far-infrared and mm ranges

S. G. Gasan-Zade; Evgenij A. Salkov; G. A. Shepelshky; Fiodor F. Sizov; George S. Svechnikov

doi:10.1117/12.317843

18 August 1998 Thermal radiation detecting in far-infrared and millimeter ranges

S. G. Gasan-Zade, Evgenij A. Salkov, G. A. Shepelshky, Fiodor F. Sizov, George S. Svechnikov

Proceedings Volume 3505, Imaging System Technology for Remote Sensing; (1998) https://doi.org/10.1117/12.317843
Event: Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 1998, Beijing, China

Abstract

It had been discussed earlier existing of the controlled photoconductivity (PC) in gapless semiconductor Hg_1-xCd_xTe which is induced within the millimeter (MM) and IR ranges by uniaxial stress or high magnetic field. These forces open the energy gap following to E_g(P)-bx(s₁₁-s₁₂) xP or E_g(H)-heH/4m_nc respectively and influence the generation and recombination processes in the material. Here, b is a deformation potential constant, s_ij is an elastic strain tensor components and m is an electron effective mass in conduction band. In this report a possibility is analyzed of effective detecting of the MM and submillimeter (SMM) thermal radiation by means of the above mentioned controlled PC in combination with a parametric heterodyning of frequencies. The problem seems to be resolvable because the number of spectral lines can be generated with tunable lasers of high enough power within the MM and SMM radiation range. The features are also taken into account that arise in connection with the spectral 'quality' of black-body radiation and in the cases when radiator has a size of order of the wavelength to be detected. It is shown that the ratio can drastically influence the efficiency of detecting process because the time which is necessary to detect this radiator, or object consist of small-size particles.

Citation Download Citation

S. G. Gasan-Zade, Evgenij A. Salkov, G. A. Shepelshky, Fiodor F. Sizov, and George S. Svechnikov "Thermal radiation detecting in far-infrared and millimeter ranges", Proc. SPIE 3505, Imaging System Technology for Remote Sensing, (18 August 1998); https://doi.org/10.1117/12.317843

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