Fiber laser dynamic ranging system fusing sweeping frequency and single frequency

A distance measuring system, fiber laser technology, applied in radio wave measurement systems, measurement devices, electromagnetic wave re-radiation and other directions, can solve the problem of difficult to achieve high-precision measurement of dynamic targets, and achieve the effect of improving quality

Active Publication Date: 2019-07-05
CHONGQING UNIV
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  • Description
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Problems solved by technology

However, if the measured target has a displacement of △L within the frequency sweep period T, the influence of the Doppler effect will occur, which...

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  • Fiber laser dynamic ranging system fusing sweeping frequency and single frequency
  • Fiber laser dynamic ranging system fusing sweeping frequency and single frequency
  • Fiber laser dynamic ranging system fusing sweeping frequency and single frequency

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Embodiment Construction

[0034] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic concept of the present invention, and the following embodiments and the features in the embodiments can be combined with each other in the case of no conflict.

[0035] Wherein, the accompanying drawings are for illustrative purposes only, and represent only schematic diagrams, rather than physical drawings, and should...

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Abstract

The invention relates to a fiber laser dynamic ranging system fusing sweeping frequency and single frequency, and belongs to the technical field of laser ranging. In the system, a single-frequency laser and a frequency modulation laser are used to provide two different input lights, which are fused by a wavelength division multiplexer to reach a fiber-optic probe through a coupler; beams of two frequency bands are emitted and illuminated by the fiber-optic probe to the surface of a vibrating target, and reflected by the end face of the fiber-optic probe and the surface of the vibrating targetto form respective reference light and measuring light; the reference light and measuring light reach a photodetector through the coupler, the fiber amplifier and the wavelength division multiplexer,and a frequency sweeping ranging signal and a single frequency ranging signal are synchronously obtained at the photodetector; finally, in the system processing software, the time-frequency analysis speed judgment principle and the Doppler effect compensation principle are comprehensively utilized to fuse the frequency sweeping ranging signal and the single frequency ranging signal, thereby realizing accurate measurement of the absolute distance of the dynamic target.

Description

technical field [0001] The invention belongs to the technical field of laser distance measurement, and relates to a fiber laser dynamic distance measurement system integrating frequency sweep and single frequency. Background technique [0002] The measurement of the absolute distance or displacement of the target has a wide demand in many fields. Frequency-swept fiber laser ranging technology has the advantages of high measurement accuracy, strong anti-interference ability, and no ranging ambiguity, and has been widely researched and applied. The principle of frequency-swept fiber laser ranging system is as follows: figure 1 As shown, the frequency-swept laser injects chirp light into the fiber probe through the coupler, and the optical fiber reflects the reference light and measurement light respectively on the end face of the fiber probe and the surface of the measured target; since there is a certain distance L between the end face of the fiber probe and the surface of t...

Claims

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Application Information

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IPC IPC(8): G01S17/08G01S17/58
CPCG01S17/08G01S17/58
Inventor 张伟陈伟民邵斌
Owner CHONGQING UNIV
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