Laser interferometry ranging measurement system based on space spectrum holographic storage
A holographic storage and laser interference technology, applied in the field of laser interference ranging, can solve the problems of complex system and immature technology, achieve the effect of high operating frequency, high-precision absolute distance measurement, and reduce the requirements of hardware computing power
Inactive Publication Date: 2012-07-04
BEIHANG UNIV
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However, because the system is relatively complex and the technology is not very mature, it has not been widely used in engineering.
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[0024] Such as figure 1 As shown, the laser 1 at the transmitting end can be a high-power continuous wave fiber laser, and the emitted beam enters the electro-optic modulator 2 to be modulated by the radio frequency signal RF1, and the electro-optic modulator 2 is selected according to the frequency of RF1. In order to improve the distance resolution, a 2GHz broadband radio frequency signal is used in the implementation. After the beam output from the electro-optic modulator 2 passes through the beam expander collimator 4 and the multi-path beam splitter 5, one of the beams enters the transmitting telescope 6, and in the transmitting telescope 6, the beam is expanded and collimated again to illuminate the target. After the light beam scattered from the target is collected by the receiving telescope 7, it is the echo beam. The echo beam and the other beam of light output by the multi-channel beam splitter 5—the reference beam, pass through the focusing lens 8 together, are foc...
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The invention provides a novel laser interferometry ranging measurement system based on space spectrum holographic storage. In the invention, the beam from the same laser are divided into two beams, one beam serves as a reference beam, the other beam serves as a detection beam through a telescope; the spatial spectrum of the interference between a target reflection echo beam and the reference beam, which is on a photonic crystal is subject to holographic storage to be a diffraction grating; and then a linear frequency modulation laser scanning beam irradiates the photonic crystal to read the target range information in the diffraction grating, a diffraction beam passing through the photonic crystal contains target distance information and is subject to Fourier transform to be finally detected by a photonic detector, and at the moment, the time domain signal output by the detector is an interference spectrum in the photonic crystal, therefore, the time delay of the target reflection echo can be extracted to realize range measurement. By using the system of the invention, the requirement for computing capability of hardware is reduced, and the range resolution of the system can be greatly improved through the high-bandwidth processing of the photonic crystal.
Description
technical field [0001] The present invention mainly relates to a laser interference ranging technology of spatial spectrum holographic storage and processing technology on photonic crystals, especially using the spatial spectrum holographic storage of echo beam and reference beam interference in photonic crystals, read by linear frequency modulation A laser interferometric ranging system that acquires and processes the spatial spectrum of the beam. Background technique [0002] The principle of laser ranging is to use a laser to emit a laser pulse beam to the target, and calculate the distance to the target by measuring the round-trip time or phase of the laser pulse beam reaching the target and returning from the target to the receiving telescope. Compared with traditional ranging technology, laser ranging technology has a series of advantages such as high measurement accuracy, good collimation, and strong anti-interference ability, and has been widely used in remote sensin...
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IPC IPC(8): G01S17/48
Inventor 何云涛江月松欧军华厚强
Owner BEIHANG UNIV