Paper quantitative detection method based on terahertz phase shift feature and particle swarm algorithm
A particle swarm algorithm and terahertz technology, which is applied in paper detection and terahertz technology application fields, can solve the problems of radioactive pollution, susceptibility to the influence of scattering and diffuse reflection, harmful to human body, etc., and achieve no radioactive pollution, device Use safe, robust effects
Active Publication Date: 2019-09-10
CHINA UNIV OF MINING & TECH
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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.
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[0032] Below in conjunction with embodiment, the present invention is described in further detail.
[0033] like figure 1 Shown is the flowchart of the detection method described in this patent.
[0034] In this patent, 80g / m is used when establishing the quantitative value prediction model of paper 2 Printed paper to illustrate the implementation process and steps of this method. During the experiment, multiple sheets of paper were stacked together as a paper standard sample, and the quantitative value of the paper standard sample was measured by a high-precision electronic balance.
[0035] When the terahertz wave passes through a paper standard sample with a certain thickness, its waveform will change due to the influence of absorption and scattering, which is manifested as the decrease of the amplitude and the delay of the peak position. After the terahertz time-domain waveform is Fourier transformed, the transfer function in the frequency domain can be obtained accordi...
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The invention discloses a paper sheet quantitative detection method based on terahertz phase shifting characteristics and a particle swarm algorithm. The paper sheet quantitative detection method mainly comprises the following steps: manufacturing a paper sheet quantitative value standard sample and measuring a terahertz time-domain light spectrum of the standard sample; carrying out Fourier transformation to obtain a terahertz phase shifting spectrum of the standard sample; carrying out frequency selection by adopting the particle swarm algorithm and establishing a paper sheet quantitative value predication model by utilizing a partial least square method; then measuring the terahertz time-domain light spectrum of a paper sheet to be detected; after obtaining the terahertz phase shifting spectrum, calculating a paper sheet quantitative value by applying the established paper sheet quantitative value predication model. The method disclosed by the invention is a paper sheet quantitative detection method based on novel characteristics of a terahertz light spectrum and belongs to the field of nondestructive testing; the selected characteristics have a good noise interference resisting capability and the predication accuracy is high; the paper sheet quantitative detection method is applicable to detection of the paper sheet quantitative value; meanwhile, the paper sheet quantitative detection method can be expanded to thickness detection of other thin film materials with relatively small absorption at terahertz wavebands.
Description
technical field [0001] The invention relates to a paper quantitative detection method, specifically a paper quantitative detection method based on a terahertz phase shift feature and a particle swarm algorithm, and belongs to the technical field of paper detection and the application field of terahertz 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 o...
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IPC IPC(8): G01N21/3586G06N3/00
Inventor 曹丙花范孟豹王伟孙彦景盛恒李超
Owner CHINA UNIV OF MINING & TECH