Direct detection anemometry laser radar system and anemometry method based on double working wavelengths

Abstract

The invention provides direct detection anemometry laser radar system and anemometry method based on double working wavelengths. The working wavelengths of the system are in an optical communication band of 1.5 micrometers. A full optical fiber structure is used. Space optical components are not used. The anemometry method uses double working wavelengths. Two working wavelengths respectively occupy odd pulse and even pulse. The frequency positions of two working wavelengths are respectively located at symmetric positions on left and right sides of the transmittance peak of an optical fiber Fabry-Perot discriminator (FFPI). By measuring the transmittance change of an echo signal on two edges of a transmittance curve, Doppler frequency shift is acquired, and radial velocity inversion is carried out. According to the invention, only a single-channel Fabry-Perot interferometer is used; an optical path structure is simplified; the cost is reduced; the number of calibration coefficients which need to be acquired in a calibration process is reduced; unsynchronized changes which are caused due to the fact that a number of channels of the discriminator change with vibration, temperature difference and other environment changes in a double edge technology are avoided; and the system stability is improved.

Description

technical field [0001] The invention belongs to the technical field of direct detection and wind measurement laser radar, and in particular relates to a direct detection and wind measurement laser radar system and a wind measurement method based on dual working wavelengths. Background technique [0002] Since the 1980s, the direct detection wind lidar technology has become more and more mature, and the direct detection technology has gradually attracted attention in the field of wind lidar with its unique advantages (high spatial and temporal resolution, high measurement accuracy, and large spatial coverage, etc.) . [0003] In 1989, the French Chanin research group first reported the measurement of the average wind field lidar in the middle atmosphere. The wind lidar system used the double-edge technology of the FP (Fabry-Perot) etalon, and used the molecular backscattering signal to retrieve the horizontal wind speed of the atmosphere. The one-dimensional component, whose...

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Problems solved by technology

Both channels need to obtain two correction coefficients in the calibration process, and the number of correction coefficients to be obtained increases, which brings greater system error

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