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Difference absorption lidar system for composite light beam transmission and reception

A technology of laser radar and differential absorption, which is applied in the direction of radio wave measurement system, electromagnetic wave re-radiation, and utilization of re-radiation, can solve problems such as errors and achieve the effect of eliminating system errors

Active Publication Date: 2016-10-12
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

In the currently designed pulse laser radar, the two pulses are emitted successively. This is based on the assumption that the atmosphere is solidified and unchanged during the time interval between the two pulses. In fact, due to the movement of the atmosphere (turbulence, etc.), this Assumptions lead to error

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  • Difference absorption lidar system for composite light beam transmission and reception

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Embodiment Construction

[0017] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0018] 1. The principle, type, structure, function, energy, beam quality, and polarization state of the detection pulse laser 11 and the reference pulse laser 12 are exactly the same, and they are in the same spectral band, but the wavelength is slightly different, less than 1nm or even less than 0.5 nm, the linearly polarized light pulses of the laser pulse oscillator are emitted simultaneously;

[0019] 2. The two kinds of pulse beams pass through the half-wave plate A5 and the half-wave plate B6 respectively, and still maintain the linear polarization state, but will change the direction of the linear polarization. By rotating the half-wave plate, the transmi...

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Abstract

The present invention discloses a difference absorption lidar system for composite light beam transmission and reception. The system consists of two pulsed lasers, two half-wave plates, two reflectors, two polarization beam splitters, two quarter-wave plates, two plane mirrors, a beam expander, a telescope, two filters, two photo detectors, a pulse energy monitor and a data processing unit. The invention is characterized in that two laser pulses, a detection pulse and a reference pulse are simultaneously transmitted and received, and the wavelengths are close to each other, so that they travel the same atmospheric path, and their landing footprints coincide in earth observation. An advantage of the present invention is that influences of other interfering atmospheric factors are eliminated with the difference in the received echoes only caused by differences in the absorption of the two laser pulses by the atmosphere along the travel path.

Description

technical field [0001] The present invention relates to the field of differential absorption lidar, in particular, to an arrangement for beam recombination of a differential absorption lidar system. Background technique [0002] The current lidar system detects atmospheric composition and meteorological parameters of temperature, humidity, and pressure, mainly using Raman lidar and differential absorption lidar. The atmosphere is a random medium, and the process of atmospheric motion is very complex, so it is difficult to describe the interaction between the laser beam and the atmosphere. Differential absorption lidar is widely used. This system is used to measure the emission and reception of two wavelength laser pulses. One is called the detection pulse, which is absorbed by a certain component of the atmosphere; the other is called the reference pulse, which the atmosphere controls. The absorption is not obvious; the wavelengths of the two pulses are very similar, and a ...

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Application Information

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IPC IPC(8): G01S17/95G01S7/483
CPCG01S7/483G01S17/95Y02A90/10
Inventor 洪光烈王钦
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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