Laser ceilometer

Abstract

A laser ceilometer comprises a laser, a circulator, an optical antenna, an optical detector and a signal processor. Laser emitted by the laser enters the circulator; the optical antenna transmits the laser passing through the circulator to a cloud layer and receives the laser returned from the cloud layer; the optical detector converts the laser returned from the cloud layer into an echo signal and sends the echo signal to the signal processor electrically connected with the optical detector for processing and analysis; the optical detector adopts an adjusting mode that the APD gain exponentially increases along with the time from laser pulse emission to return. Compared with the prior art, the laser ceilometer improves the stability of echo signals.

Description

technical field [0001] The invention relates to the field of optical measurement, in particular to a laser ceilometer. Background technique [0002] The formation and evolution of clouds is an intricate physical process in the atmosphere, and it is also an important sign that predicts weather changes. The so-called cloud height mainly refers to the vertical distance between the cloud base and the ground of the station. Cloud height has a more direct impact on aviation flight, flight altitude, route selection, etc. need to fully consider cloud height. Therefore, obtaining high-precision cloud height has profound significance for the fields of meteorological forecasting technology and aviation technology. [0003] In the prior art, the laser ceilometer is widely used because of its advantages of high detection accuracy, fast speed, reliable operation and convenient maintenance. The laser ceilometer mainly uses the principle of atmospheric scattering. When in use, the laser...

AI Technical Summary

Problems solved by technology

However, as the cloud height changes, the size of the echo signal attenuates, making the echo signal received by the laser ceilometer unstable and affecting the measurement accuracy

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