Terahertz Pulse Signal Sampling Method Based on Finite Innovation Rate Sampling Theory
A terahertz pulse and signal sampling technology, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of low data acquisition rate, limited time resolution, and inability to satisfy sampling, etc., to achieve efficient and efficient processing. The effect of reducing the sampling rate and expanding the range
Active Publication Date: 2017-09-12
XIDIAN UNIV
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However, time-division electro-optic sampling uses a mechanical and electric translation stage to change the optical path difference between the pump pulse and the probe pulse, and the data acquisition rate is very low, which cannot meet the sampling requirements for time-domain terahertz spectra of fast-moving objects.
The chirped pulse measurement technique is a frequency domain technique, while the terahertz pulse modulates the chirped detection pulse in the time domain, and the signal is extracted in the frequency domain, so its time resolution is limited due to the time-frequency relationship
In addition, since the electro-optical sampling technology is very sensitive to laser noise, it is quite troublesome to adjust its optical path
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[0016] The present invention will be further described below in conjunction with accompanying drawing:
[0017] refer to figure 1 , is the first flow chart of the terahertz pulse signal sampling method based on the finite innovation rate sampling theory of the present invention, referring to figure 2 , is the second flowchart of the terahertz pulse signal sampling method based on the finite innovation rate sampling theory of the present invention; the terahertz pulse signal sampling method based on the finite innovation rate sampling theory includes the following steps:
[0018] Step 1, obtain the terahertz pulse signal, take a frequency point every 1 / τ on the frequency axis of the frequency spectrum of the terahertz pulse signal, and obtain a plurality of evenly distributed discrete frequency points; the obtained discrete frequency points In the set of sequence numbers of , select the sequence numbers of 2M+1 frequency points, and use the set of sequence numbers of the sele...
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The invention belongs to the technical field of terahertz pulse signal sampling and particularly relates to a terahertz pulse signal sampling method based on the finite rate-of-innovation sampling theory. The method includes the steps of selecting frequency points every other 1 / t from a frequency axis of a frequency spectrum of terahertz pulse signals so as to obtain a plurality of discrete frequency points; from a set of serial numbers of the discrete frequency points, using a set of the serial numbers of the 2M+1 frequency points as a frequency domain number set I; acquiring single-frequency signals of the frequency point corresponding to each serial number in the frequency domain number set I, and subjecting each single-frequency signal and the terahertz pulse signal to frequency mixing to obtain 2M+1 mixed signals; in a pulse period t, subjecting each mixed signal to integral operation to obtain a corresponding Fourier series coefficient; according to each Fourier series coefficient, estimating delay parameter and amplitude parameter of each terahertz pulse signal; according to estimated values of the delay and amplitude parameters of the terahertz pulse signals, reconstructing terahertz pulse signals.
Description
technical field [0001] The invention belongs to the technical field of terahertz pulse signal sampling, in particular to a terahertz pulse signal sampling method based on the finite innovation rate sampling theory. Background technique [0002] Terahertz electromagnetic waves have a special position in the electromagnetic spectrum. Compared with other electromagnetic waves, they have many superior characteristics and important application values in the fields of basic research, industry, military, biology and medicine. However, the power of terahertz radiation sources is generally relatively low at present, which makes it very difficult to detect terahertz signals. Therefore, it is urgent to develop high-sensitivity terahertz detection technology. Compared with the detection of terahertz pulsed radiation, photoconductive sampling method and electro-optical sampling method are the two most widely used methods for coherently detecting terahertz pulsed signals. Among them, t...
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IPC IPC(8): G06F19/00
Inventor 王敏严孝波褚旭
Owner XIDIAN UNIV