Dynamic multipoint grass variety identification and authentication method based on terahertz time domain spectroscopy
A terahertz time-domain, terahertz pulse technology, applied in the measurement of color/spectral properties, material analysis by optical means, measurement devices, etc., can solve the problems of long time, cumbersome process, expensive equipment, etc., to avoid fragmentation Effect
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Embodiment 1
[0078]The dynamic, multi-point identification and authentication method of grass varieties based on terahertz time-domain spectroscopy provided by the present invention can be detected by using a transmission terahertz time-domain spectroscopy device (THz-TDS), wherein a titanium-sapphire femtosecond mode-locked pulse laser generates A laser light source with an adjustable center wavelength of 810nm, a repetition rate of 82MHz, and a pulse width of 100fs; the laser pulses used in the above device are divided into two beams, one beam is used as pump light to excite GaAs photoconductive wires to generate THz pulses; the other One beam is used as the probe light, and the THz signal is measured by a crystal detector, and finally the THz signal is collected by a lock-in amplifier controlled by a chopper.
[0079] In order to prevent the influence of water vapor in the air on the THz signal, the optical path from generating the THz signal to the detection signal is sealed in a box fi...
Embodiment 2
[0126] In this embodiment, a multi-point and dynamic terahertz detection method is used to sample and detect the grassland No. 2 sample to be tested;
[0127] The grassland No. 2 sample to be tested in this example is sampled using the "sampling device for transmission-type terahertz detection (patent number is ZL 201520239272.7)"; wherein, the grassland No. 2 sample to be tested has 13 sampling points , the distribution of the 13 sampling points is as follows Figure 8 As shown; using a transmission-type terahertz time-domain spectrometer to sample and detect the grassland No. 2 sample to be tested, after the sampling and detection, perform data processing to obtain the average refractive index n(ω) and average absorption of the grassland No. 2 sample to be tested Coefficient α(ω) and other data, and then compare the average refractive index n(ω) and average absorption coefficient α(ω) data of Grassland No. 2 sample to be tested with the corresponding data of Grassland No. D...
Embodiment 3
[0135] In this embodiment, a single-point, static terahertz detection method is used to sample and detect the grassland No. 2 sample to be tested;
[0136] Grassland No. 2 samples to be tested in this embodiment are sampled using a conventional sampling device (i.e. a hollow box in the middle made of transparent polyethylene material in the prior art), that is, the Grassland No. 2 samples to be tested are placed in the On the sampling device, then place the sampling device at the position facing the terahertz pulse, and then emit a terahertz pulse for sampling detection. After sampling, take out the sampling device together with the sample, re-arrange the sample to another position, and then carry out The next sampling test; in the present embodiment, there are 13 sampling points for the grassland No. 2 sample to be tested, and a total of 13 samples are taken for the 13 sampling points. Sampling pulse, and then sampling detection;
[0137] After the sampling and testing, data...
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