Non-polarization beam splitter-based Rayleigh scattering Doppler frequency discriminator for F-P (Fabry-Perot) etalons

Abstract

The invention discloses a non-polarization beam splitter-based Rayleigh scattering Doppler frequency discriminator for F-P (Fabry-Perot) etalons. The discriminator comprises a signal fiber, a laser transmission frequency zero-point calibrating fiber, a non-polarization beam splitter, a reflecting prism, a Fabry-Perot etalon and a detector. The prior high amount of splitters and reflectors are replaced with the splitting and reflecting prisms, thus the structure of the discriminator is simplified. The prisms are integrally connected under intermolecular action, and fewer optical interfaces for passage of light are used; all fiber ends are coated with antireflection films, signal loss of the discriminator is lowered, and optical efficiency is improved. The prims are non-sensitive to polarization of incoming light, thus measuring precision is improved. By adding the laser transmission frequency zero-point calibrating fiber, an error between laser transmission frequency and etalon zero-point is calibrated. A zero-air-velocity calibration signal and an atmospheric echo signal share the set of primes and are isolated by the optical switch.

Description

technical field [0001] The invention relates to the fields of laser remote sensing, atmospheric detection and photoelectric detection, in particular to an F-P etalon Rayleigh scattering Doppler frequency discrimination device based on a non-polarization beam splitting prism. Background technique [0002] With its high resolution, high precision, large detection range, and ability to provide three-dimensional wind field information, Doppler wind lidar has attracted the attention and attention of many countries in the world, and invested a lot of manpower and material resources in research . According to different detection methods, Doppler wind lidar technology can be divided into coherent technology and non-coherent (direct detection) technology, in which direct detection technology measures energy signals, mainly edge technology and fringe (imaging) technology, edge technology It is to use narrow-band filters as Doppler frequency detection devices, such as Fabry-Perot etal...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to propose an F-P etalon Rayleigh scattering Doppler frequency discrimination device based on a non-polarizing beam splitter. Low Optical Efficiency of Rayleigh Scattering Doppler Discrimination Device with All-fiber Structure for Ultraviolet Waveband

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