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Terahertz spectral frequency and linearity calibration module

A technology for spectral frequency and calibration modules, which is applied in the field of terahertz spectral frequency and linearity calibration modules, to achieve the effects of improving stability, improving calibration accuracy, and improving convenience

Active Publication Date: 2020-11-27
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of the existing terahertz spectral frequency calibration and linearity calibration separately, the present invention proposes a calibration module integrating terahertz spectral frequency and linearity measurement functions, through the terahertz total reflection mirror in front of the terahertz receiving end The rotation of the terahertz spectrum can realize the switching between the terahertz spectrum frequency and the terahertz spectrum linearity calibration

Method used

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  • Terahertz spectral frequency and linearity calibration module

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Embodiment 1

[0022] The present invention proposes a terahertz spectral frequency and linearity calibration module, which consists of a terahertz transmitting terminal 1 (such as a terahertz photoconductive transmitting antenna), a terahertz receiving terminal 9 (such as a terahertz photoconductive detecting antenna), a The gas sample chamber 3, a terahertz standard attenuation plate array 7 and four terahertz total reflection mirrors are respectively the first terahertz total reflection mirror 4, the second terahertz total reflection mirror 5, the third terahertz total reflection mirror 6, The fourth terahertz total reflection mirror 8 and a terahertz half mirror 2 are composed. The terahertz transmitting end 1 realizes the generation of terahertz signals, the terahertz receiving end 9 realizes the detection of terahertz signals, and the terahertz half mirror 2 divides the terahertz waves into two beams; the first terahertz total reflection mirror 4 , the second terahertz total reflection...

Embodiment 2

[0024] On the basis of Example 1, as figure 1 As shown, a terahertz spectral frequency and linearity calibration module is used for the specific principle steps of terahertz spectral frequency calibration:

[0025] Step 101, select a terahertz transmitter 1, a terahertz half mirror 2, a gas sample chamber 3, a first terahertz total reflection mirror 4, a second terahertz total reflection mirror 5, and a terahertz receiver 9; The terahertz wave emitted by terminal 1 is reflected by the terahertz half mirror 2 to the gas sample chamber 3 (at this time, the inside is filled with dry air). After the terahertz wave interacts with the dry air, it passes through the first terahertz total reflection mirror 4 and The second terahertz total reflection mirror 5 is reflected to the terahertz receiving end 9, and the signal detected by the terahertz receiving end 9 is used as a reference signal after Fourier transform.

[0026]Step 102, discharge the dry air in the gas sample chamber 3, a...

Embodiment 3

[0029] On the basis of embodiment one and embodiment two, such as figure 2 As shown, a terahertz spectral frequency and linearity calibration module is used for the specific principle steps of terahertz spectral linearity calibration as follows:

[0030] Step 201, select terahertz transmitter 1, terahertz half mirror 2, third terahertz total reflection mirror 6, terahertz standard attenuation sheet array 7, fourth terahertz total reflection mirror 8, second terahertz total reflection The mirror 5 and the terahertz receiving end 9; the terahertz standard attenuation sheet array 7 is composed of a total of five attenuation sheets with attenuation amounts of 3dB, 6dB, 9dB, 12dB, and 12dB.

[0031] Step 202, first, the terahertz wave emitted by the terahertz transmitting end 1 is transmitted by the terahertz semi-mirror 2 to the third terahertz total reflection mirror 6, and then reflected into the terahertz standard attenuation plate array 7 (at this time, do not put into the t...

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Abstract

The invention discloses a terahertz spectral frequency and linearity calibration module. The terahertz spectral frequency and linearity calibration module is composed of a terahertz transmitting end,a terahertz receiving end, a gas sample chamber, a terahertz standard attenuation sheet array, four terahertz holophotes and a terahertz semi-reflecting and semi-transmitting lens. The terahertz transmitting end is used for generating a terahertz signal; terahertz signals are detected by the terahertz receiving end, terahertz waves are divided into two beams by the terahertz semi-reflecting and semi-transmitting lens, the terahertz semi-reflecting and semi-transmitting lens is used for reflecting the terahertz waves, calibration of terahertz spectral frequency can be realized by the sample chamber filled with standard gas, and calibration of terahertz spectral linearity can be realized by the terahertz standard attenuation sheet array. By rotating the terahertz semi-reflecting and semi-transmitting lens, switching calibration of spectral frequency and linearity is realized, influence of factors such as movement of a standard instrument on the repeatability and accuracy of a calibrationresult can be avoided, meanwhile, the use convenience can be improved, and the current terahertz spectrum calibration requirement can be met.

Description

technical field [0001] The present invention relates to the technical field of terahertz time-domain spectroscopy system calibration, in particular to a terahertz spectrum frequency and linearity calibration module. Background technique [0002] Terahertz time-domain spectroscopy technology has developed rapidly in the past ten years and has become an important method in the field of spectral analysis. Since the vibration or rotational energy levels of many molecules are in the terahertz band, the terahertz spectrum contains rich physical and chemical information, so the terahertz time-domain spectroscopy technology is widely used in the detection of explosives, the analysis of drug components, and biological samples. Testing, semiconductor material testing and gas monitoring and many other fields. The calibration of the terahertz time-domain spectroscopy system is of great significance to the research of terahertz spectroscopy in the above fields. [0003] The calibration...

Claims

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Application Information

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IPC IPC(8): G01J3/28G01J3/12G01N21/3586
CPCG01J3/2823G01J3/12G01N21/3586
Inventor 杨延召吴斌朱军锋刘红元王洪超李京松
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP