A rotational Raman temperature measurement lidar based on dual wavelength and single receiving channel

Abstract

The invention discloses a double-wavelength single receiving channel-based rotation Raman temperature measurement laser radar. The laser radar is based on two working wavelengths and a single receiving channel. The two working wavelengths of the laser radar are respectively composed of odd number pulses and even number pulses. The low-quantum-number rotation Raman signals of one working wavelength and the high-quantum-number rotation Raman signals of the other working wavelength are extracted by the receiving channel of the laser radar. The laser radar is operated alternately at the two working wavelengths in the time division multiplexing manner. The atmospheric temperature is calculated based on the ratio of high-quantum-number rotation Raman signals to low-quantum-number rotation Raman signals. According to the technical scheme of the invention, the rotation Raman temperature measurement is realized only by means of a single filter, a single detector and a single acquisition card. Compared with a single-wavelength double receiving channel-based rotation Raman temperature measurement laser radar, the above laser radar is compact in structure, wherein the difficulty of optical path adjustment and the difficulty of system parameter calibration are lowered. Meanwhile, the double-wavelength single receiving channel-based rotation Raman temperature measurement laser radar is low in cost. The working performance difference between the filter and the detector caused by the inconsistence of working environments can be avoided. Moreover, the detection accuracy, the system stability and the environmental adaptability are improved.

Description

technical field [0001] The invention relates to the field of temperature measuring laser radar, in particular to a rotating Raman temperature measuring laser radar based on a dual-wavelength single receiving channel. Background technique [0002] Temperature is an important parameter of the state of the atmosphere. Temperature data play an important role in the fields of atmospheric dynamics, climatology, and atmospheric chemistry, and in the study of global warming, intermediate temperature inversion layers, and Earth's gravitational wave science. In addition, atmospheric temperature is also a necessary input parameter for many remote sensing methods, such as: when Raman lidar measures aerosol backscattering coefficient and aerosol extinction coefficient; when Raman lidar measures aerosol polarization state and water vapor mixing ratio; differential absorption When lidar measures the density of a gas; when Doppler Rayleigh lidar detects the atmospheric wind field. [0003...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned rotating Raman temperature measurement lidar adopts a single light source and dual receiving channels. This working method requires two optical filters, two detectors and two acquisition cards, which inevitably introduces optical filters System errors caused by bandwidth and filter differences, inconsistent detector responsivity, and different acquisition performance of acquisition cards

For example, different ambient temperatures will lead to different noise distributions of the detectors; different input voltages of the detectors will lead to different responses of the detectors; when the lidar is in a vibrating environment, the coupling efficiencies of the two detectors are different; in addition, optical pollution and Detector aging problems cannot avoid causing differences in detectors, which requires periodic calibration

Moreover, the dual receiving channels lead to problems such as difficult adjustment of the optical path, high manufacturing costs, and complex system calibration.

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