Solar radiation background noise suppression system based on Fabry - Perot etalon
A technology of background noise and solar radiation, applied to the re-radiation of electromagnetic waves, the use of re-radiation, radio wave measurement systems, etc., can solve the problems that cannot really improve the signal-to-noise ratio during the day, and avoid the filter transmittance The effect of improving the signal-to-noise ratio and the effect of improving the signal-to-noise ratio
Active Publication Date: 2016-09-28
UNIV OF SCI & TECH OF CHINA
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However, this method has the following disadvantages: first, the Fraunhofer dark line of the solar spectrum is a fixed wavelength, which is not suitable for other wavelength lidars; second, the detector has a wide-spectrum response, even if the working wavelength is the dark line wavelength of the solar spectrum , then the detector can still respond to other ranges of wavelengths, and can also accept the background noise of the sun during the day, and cannot really achieve the purpose of improving the signal-to-noise ratio during the day
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[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.
[0033] figure 1 A schematic structural diagram of a solar radiation background noise suppression system based on a Fabry-Perot etalon provided by an embodiment of the present invention. like figure 1 As shown, the system mainly includes:
[0034] Laser 1, first beam splitter 2, collimating beam expander 3, first reflecting mirror 4, optical receiving telescope 6, second reflecting mirror 7, collimating lens 8, first coupling fiber 9, first collimator 1...
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The invention discloses a solar radiation background noise suppression system based on a Fabry - Perot etalon. Daytime background noise is suppressed by using an ultra-narrowband tunable FP etalon as a filtering device, and technical support is provided for laser radar continuous full-time observation. A tunable FP etalon filter achieves closed-loop control by using the initial emission laser as the feedback signal of the system to ensure that the outgoing wavelength of the laser matches the center wavelength of the filter in real time. The system is applicable to laser radars of any working wavelengths. Since closed-loop control has less restricted requirements on a work environment, filter picometer-level bandwidth is strong in daytime background suppression of a laser radar.
Description
technical field [0001] The invention relates to the technical field of laser radar in atmospheric remote sensing, in particular to a solar radiation background noise suppression system based on a Fabry-Perot etalon. Background technique [0002] Since the invention of the laser in the 1960s, the research on various laser detection technologies around the laser has grown day by day. Atmospheric science is a discipline that combines theoretical research with atmospheric parameter detection. Atmospheric detection technology is an important foundation supporting the development of atmospheric science, especially atmospheric physics and atmospheric environment science. At present, there are many atmospheric parameter detection methods in the locations below the boundary layer, but the measurement methods of atmospheric parameter information in the upper and middle layers are relatively scarce, especially in the stratosphere and above. Lidar remote sensing technology is an active...
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Login to View More IPC IPC(8): G01S17/95G01S7/493
CPCG01S7/493G01S17/95Y02A90/10
Inventor 舒志峰夏海云窦贤康薛向辉
Owner UNIV OF SCI & TECH OF CHINA