Improved high-speed dispersion mismatch correction method for FMCW absolute distance measuring technique

A measurement technology, an absolute distance technology, applied in the field of improved high-speed dispersion mismatch correction, which can solve the problems affecting the measurement efficiency and the huge amount of computation, and achieve the effect of increasing the distance measurement speed, reducing the computation amount, and eliminating dispersion

Active Publication Date: 2016-09-21
HARBIN INST OF TECH
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Problems solved by technology

Therefore, when N is large, the amount of calculation required is

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  • Improved high-speed dispersion mismatch correction method for FMCW absolute distance measuring technique
  • Improved high-speed dispersion mismatch correction method for FMCW absolute distance measuring technique
  • Improved high-speed dispersion mismatch correction method for FMCW absolute distance measuring technique

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Embodiment Construction

[0025] In order to eliminate the impact of frequency modulation nonlinearity, the sampling frequency sampling method samples the signal in this embodiment; figure 1 It is a schematic diagram of an existing optical path principle used for FMCW absolute distance measurement, which is used in this embodiment figure 1 The signal of the auxiliary interferometer is used as the sampling clock of the data acquisition card to sample the signal of the measurement path. This method can effectively eliminate the influence of frequency modulation nonlinearity.

[0026] The specific process of the improved high-speed dispersion mismatch correction method in this embodiment:

[0027] Since the optical path is usually built with optical fiber, the signal I(f) obtained by the auxiliary interferometer is expressed as:

[0028]

[0029] Among them, f is the instantaneous frequency of the laser, A 0 is the amplitude of the interference signal, n g is the refractive index of the auxiliary in...

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Abstract

The invention provides an improved high-speed dispersion mismatch correction method for FMCW absolute distance measuring technique, belongs to the field of absolute distance measurement, and is to solve the problem of low measurement efficiency of an existing absolute distance measuring high-speed dispersion mismatch correction method. The method comprises the following steps: establishing an auxiliary interferometer through optical fibers, obtaining dispersive auxiliary interferometer signals, sampling signals of a measurement path with the signals as a data acquisition card sampling clock and obtaining a distance measurement signal Im(m); processing the distance measurement signal Im(m) to obtain distance spectrum of the measurement signal; carrying out d-multiple downsampling on the measurement signal Im(m) to obtain a measurement signal DI(m), the distance spectrum of which is shown in the specification; and when the P(k) is maximum, obtaining corresponding distance obtained after high-speed dispersion mismatch correction from the Im(m).

Description

technical field [0001] The invention relates to an improved high-speed dispersion mismatch correction method, which belongs to the field of absolute distance measurement. Background technique [0002] Laser chirp continuous wave technology makes use of the characteristics of tunable lasers to be continuously adjustable in a large range for measurement. Generally, lasers cannot achieve absolute linear frequency modulation. In order to overcome the influence of nonlinear frequency modulation, the commonly used method is frequency sampling method. [0003] The invention patent with the publication number 105259548A "A High-speed Dispersion Mismatch Correction Method for FMCW Absolute Distance Measurement Technology" proposes a dispersion mismatch correction method for frequency modulated continuous wave FMCW (Frequency Modulated Continuous Wave) absolute distance measurement technology algorithm. Due to dispersion, the measurement result becomes a chirp signal, and the amount...

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Application Information

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IPC IPC(8): G01S7/497G01S17/36
CPCG01S7/497G01S17/36
Inventor 刘国栋甘雨刘炳国路程陈凤东许新科
Owner HARBIN INST OF TECH
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