A new type of direct transmission visibility measuring device is developed. The device can obtain the visibility by measuring the atmosphere transmittance ratio of laser beam in sampling space. The measuring principle and the design scheme of the device are described. The measuring comparison experiments of this device and the reference transmittance meter are carried out. The experiment results verify the correction of test theory and technique scheme. The relative measurement error is under 20% within the test range of 10 km.
A complete set of ultra-long focal length measurement system based on the principle of Talbot effect and moiré fringe
technology has been developed. The numerical simulation is coded taking advantage of matlab. The errors deduced by
errors of parameters of ultra-long focal length measurement is studied. And the focal length variance and fluctuation
deduced by turbulence and wavefront of incident laser beam is studied.
A laboratory calibration method for transmissometer is proposed. It takes advantage of numerical simulation to
evaluate the precision of calibration method. The numerical simulation is coded taking advantage of matlab. The
calibration errors of different visibility is studied. And the influence of turbulence to calibration of transmissometer is
studied.
This paper is focus on analyzing the telescopes used in atmosphere, which studies the effect of optical aberration of
telescopes to the laser radar. The method of numerical simulation is used to calculate and analyze the characters of
backward wave when laser beam propagates through atmosphere and reflects back. Then make use of optical transfer
function including quartic phase aberrations to get the beam quality denoting the laser beam pass through the telescopes
system with aberration. It takes advantage of angle-of-arrival fluctuations, radius of power in bucket, and scintillation to
study the effect of wavefront errors to laser radar. Furthermore, comparing the scintillation of backward wave by diverse
intensity of atmospheric turbulence, it discusses the effect of optical aberration to the accuracy of radar. By synthetically
numerical analyses, this paper concludes the quantificational effect of different aberration of telescopes to the signal of
radar. The conclusion of this paper can be used to direct the design and manufacture of telescopes of optical radar.
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