Method and device for detecting terahertz radiation intensity distribution based on compressed sensing
A technology of terahertz radiation and intensity distribution, which is applied in the field of terahertz wave detection, can solve the problems of limited application range, low detection sensitivity, and slow imaging speed, and achieve the effects of easy adjustment of resolution, high sensitivity, and simple device
Inactive Publication Date: 2016-04-20
TIANJIN UNIV
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However, it has the disadvantage of slow imaging speed caused by the two-dimensional movement of the platform. In addition, the method needs to detect the intensity of each point one by one, which requires the energy and intensity distribution of the terahertz radiation source to remain stable for a long time. To obtain a higher resolution image requires a detector with higher sensitivity, but these requirements are difficult to achieve at the current stage of terahertz radiation sources and detectors, so the application range of this method is limited
The CCD and CMOS cameras in the terahertz band can realize real-time imaging, but their detection sensitivity is low, which puts forward higher requirements on the output power of the radiation source, coupled with the high price, which makes it difficult to be applied to general In the study of terahertz wave
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[0017] The purpose of the present invention is to provide a fast detection method of terahertz radiation intensity distribution. Based on the theory of compressed sensing, a fast-changing mask is designed. Each mask matrix shares a part with the next matrix, and a new mask matrix can be obtained by only moving one column, which shortens the time for replacing the mask. Using this method, on the basis of a specific mask, only using a one-dimensional mobile platform and a terahertz radiation power meter, the rapid and high-sensitivity detection of the terahertz radiation intensity distribution can be realized, and masks with different resolutions and different lenses can be used. The combination can realize imaging of radiation intensity distribution with different resolutions. At the same time, the method can also be extended and applied to the measurement of radiation intensity distribution in different bands.
[0018] The invention proposes a fast and simple terahertz radiat...
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The invention relates to a terahertz wave detection technology in order to realize fast and high-sensitivity detection on terahertz radiation intensity distribution under room temperature and realize different-resolution imaging on radiation intensity distribution according to needs. The technical scheme adopted by the invention is that a method and a device for detecting the terahertz radiation intensity distribution based on compression sensing are provided. The device comprises an expanded beam lens assembly, a mask plate, a one-dimensional electric displacement platform, a terahertz power meter or energy meter, a focusing lens and a computer, wherein the expanded beam lens assembly is formed by a concave lens of which the focal length is 50mm and a convex lens of which the focal length is 100mm; the concave lens and the convex lens are in high transmittance in a 1 to 3 THz range; the mask plate is a matrix which is formed on a sheet metal according to two values of 0 and 1, and 1 corresponds to a hollow square hole; the mask plate is fixed on the one-dimensional electric displacement platform; a collected signal can be uploaded to a data collection card of the computer. The method and the device, disclosed by the invention, are mainly applied to a terahertz wave detection occasion.
Description
technical field [0001] The present invention relates to terahertz wave detection technology, in particular to a method and device for detecting terahertz radiation intensity distribution based on compressed sensing. Background technique [0002] Terahertz (Terahertz, referred to as THz, 1THz = 10 12 Hz) radiation refers to the frequency range from 0.1THz to 10THz, the corresponding wavelength is from 3 mm to 30 microns, and the electromagnetic spectrum range is quite wide between millimeter wave and infrared light. The special position of terahertz radiation in the electromagnetic spectrum endows it with a series of special properties, which makes terahertz technology applicable to biomedical detection, material property research, security inspection and other directions. The potential broad application prospects of terahertz radiation have prompted the rapid development of its radiation source technology, and the radiation energy detection technology in the terahertz band ...
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IPC IPC(8): G01J1/04G01J1/00
CPCG01J1/0437G01J1/00
Inventor 王与烨段攀徐德刚闫超刘宏翔徐文韬唐隆煌钟凯姚建铨
Owner TIANJIN UNIV