Method for improving frequency spectrum signal-to-noise ratio of tera-hertz optical detection system

A spectral signal-to-noise ratio and optical detection technology, which is applied in the field of signal processing, can solve the problems that cannot meet the detection requirements of biological samples, and achieve the effect of improving clarity and signal-to-noise ratio, ensuring accuracy, and improving signal-to-noise ratio

Inactive Publication Date: 2016-06-01
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0004] The present invention aims at the problem that the current terahertz spectral modulation cannot meet the detection requirements of biological samples, and proposes a method for improving the spectral signal-to-noise ratio of the terahertz optical detection system. The method adds spatial light modulation to the terahertz optical detection system The pump light is modulated by the devic...

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  • Method for improving frequency spectrum signal-to-noise ratio of tera-hertz optical detection system
  • Method for improving frequency spectrum signal-to-noise ratio of tera-hertz optical detection system

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[0015] The laser described in the following example system is an example of a fiber laser with an emission wavelength of 800nm, a pulse width of 100fs, and a power of 150mW. The other bands are implemented in the same way as this band.

[0016] Such as figure 1 It is a structural schematic diagram of a reflective device for realizing the method for improving the spectral signal-to-noise ratio of a terahertz optical detection system according to the present invention.

[0017] The laser is generated by the femtosecond laser 1, and is divided into two parts when passing through the beam splitter 2. The reflected beam passes through the shaping device 3, and then passes through the reflection of the mirrors 4 and 5 in turn, and reaches the terahertz generating device 6, and the generated terahertz The light passes through the sample detection device 7 and reaches the terahertz detection device 13. In order to ensure that the optical paths of the two beams are equal, the other tr...

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Abstract

The invention relates to a method for improving the frequency spectrum signal-to-noise ratio of a tera-hertz optical detection system. According to the method, a space optical modulator is added into the tera-hertz optical detection system for conditioning pumping light, so that the generated tera-hertz spectrum is centralized to the frequency band with the concentrated sample absorption peaks so as to improve the definition and the signal-to-noise ratio of the tested sample characteristic spectral lines; the data accurate rate is ensured; convenience is provided for later-period data analysis. Compared with the existing method for improving the signal-to-noise ratio, a space optical modulator is regulated through a computer optimization algorithm; the influence on an experiment result due to other interference factors caused by artificial system regulation is avoided. The method belongs to a method for conveniently, fast and efficiently obtaining the high-signal-to-noise-ratio and high-precision tera-hertz frequency spectrum.

Description

technical field [0001] The invention relates to a signal processing technology, in particular to a method for improving the spectrum signal-to-noise ratio of a terahertz optical detection system. Background technique [0002] Terahertz (THz) waves refer to far-infrared electromagnetic radiation with a frequency between 0.1 and 10 THz (wavelength between 30 μm and 3 mm). area. It is precisely because of the special position of the terahertz wave band that terahertz has many unique properties, such as: good transmission, which can be used as a supplement to technologies such as X-ray imaging and ultrasonic imaging; safety, the photon energy of terahertz waves is very low, The photon energy of a terahertz wave with a frequency of 1THz is about 4meV, which is about 50% of the X-ray photon energy Times, so it will not produce harmful ionization to biological tissue, suitable for biopsy of biological tissue. The ability of spectral analysis is strong, and it contains rich spec...

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Application Information

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IPC IPC(8): G01N21/3586
CPCG01N21/3586
Inventor 彭滟苑肖嵘朱亦鸣张竹倩戚彬彬陈万青徐博伟张腾飞
Owner UNIV OF SHANGHAI FOR SCI & TECH
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