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Page quantitative determination device and methods based on terahertz time-domain spectroscopic technology

A terahertz time domain and quantitative detection technology, which is applied in the application field of terahertz technology, can solve the problems of harmfulness to the human body, being easily affected by scattering and diffuse reflection, and the existence of radioactive pollution, so as to achieve low energy, no radioactive pollution, and avoid The effect of multiple reflections

Inactive Publication Date: 2009-08-12
ZHEJIANG UNIV
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Problems solved by technology

This method uses the amplitude information of β-rays for quantitative detection of paper sheets, which is easily affected by scattering and diffuse reflection, and most of the ray sources used to generate β-rays are harmful to the human body and have radioactive pollution.

Method used

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  • Page quantitative determination device and methods based on terahertz time-domain spectroscopic technology
  • Page quantitative determination device and methods based on terahertz time-domain spectroscopic technology
  • Page quantitative determination device and methods based on terahertz time-domain spectroscopic technology

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Embodiment Construction

[0027] like figure 1 As shown, the femtosecond laser light emitted by the femtosecond laser 1 in the paper quantitative detection device based on terahertz time-domain spectroscopy technology is divided into two beams by the beam splitter 2, and one beam of laser light passes through the first reflector 4 and the optical delay line. 3-1 and the second reflecting mirror 5 are then focused by the focusing lens 9 onto the photoconductive antenna type terahertz transmitter 10 to generate terahertz waves, and the generated terahertz waves are collimated by the first polyethylene lens 11 into parallel beams to irradiate On the test paper sample 12, after passing through the test paper sample 12, it is focused by the second polyethylene lens 13, reflected by the ITO conductive glass 14 onto the zinc telluride electro-optic crystal 15; another beam of laser light is reflected by the third reflector 6 and the fourth reflector After the mirror 7 and the polarizer 8 are transmitted throu...

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Abstract

The invention discloses a paper sheet quantitative detection device and method based on terahertz time-domain spectroscopy technology. The detection device includes: femtosecond laser, beam splitter, optical delay device, mirror, focusing lens, photoconductive antenna type terahertz emitter, polyethylene lens, polarizer, zinc telluride electro-optic crystal, lock-in amplifier, high Power amplifier and data acquisition and processing system. The invention uses a polyethylene lens to collimate the terahertz wave into a parallel light beam, and then uses the polyethylene lens to focus the terahertz wave on the terahertz detector after passing through the paper. The paper quantitative detection method proposed by the present invention first establishes a mathematical model for paper quantitative detection, then measures the time-domain signals of the terahertz wave through the air and through the paper, extracts the delay time, and uses the established mathematical model to calculate the paper quantitative value. The invention has high measurement precision, strong anti-interference ability, little influence by multiple reflections, safe use, and can be used in precise quantitative detection of paper sheets in the field of papermaking.

Description

technical field [0001] The invention belongs to the application field of terahertz technology, and in particular relates to a paper sheet quantitative detection device and method based on terahertz time-domain spectroscopy technology. Background technique [0002] Terahertz (1THz=10 12 Hz) waves generally refer to electromagnetic wave radiation with a frequency ranging from 0.1 THz to 10 THz, which is between microwaves and infrared light. The terahertz wave technology has the following characteristics: (1) The terahertz time-domain spectroscopy technology adopts the optical pulse sampling detection method, which can obtain the transient electric field of the terahertz wave, that is, obtain the amplitude and phase information at the same time. (2) Terahertz radiation has a high transmittance to many substances such as ceramics, plastics, and dry wood chips, and can be used for quality control of these materials. (3) Terahertz radiation is a very safe electromagnetic radiat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/27G06F19/00
Inventor 曹丙花周泽魁张光新侯迪波黄平捷
Owner ZHEJIANG UNIV
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