Large-caliber laser isotope scanner and method for measuring structure constant atmosphere index of refraction

Abstract

The invention discloses a laser flasher with big diameter for measuring the structure constant of atmospheric refractivity as well as the method for that. The laser flasher comprises two opposite-arranged reflecting telescopes and lasers on the lens cones. The incident lights reach to the secondary plane mirror after being reflected by a main parabolic mirror in the lens cones, pass the openings, attenuating pieces and narrow-band interference filters on the lens cones, and then are converged on a photoelectric detector. At transmission test, two arrangements are placed at the two ends of the transmission path; the emitting system at one end of the path gives out modulated laser signals, after being transmitted by a turbulent atmosphere, the light signals are collected by the telescope at anther end, and go through photoelectric conversion by the photoelectric multiplier near to the focus; then the electric signals enter into a built-in control system for demodulation, sampling, processing, saving and displaying. The invention is of high accuracy and improves the accuracy in the measurements.

Description

technical field [0001] The invention relates to the fields of atmospheric optics and remote sensing, in particular to a method and an instrument for measuring the structural constant of the atmospheric refractive index on a transmission path, that is, the average intensity of atmospheric turbulence. Background technique [0002] Atmospheric refractive index structure constant C n 2 It is a quantitative description of optical turbulence intensity and one of the most important parameters reflecting the optical characteristics of atmospheric turbulence. Understanding C n 2 It is of great significance to study the transmission of sound, light and electromagnetic waves, evaluate the performance of optoelectronic systems, and verify the turbulence model. Measuring path-averaged C using the light intensity fluctuation effect in a turbulent atmosphere n 2 It is a direct and effective method. It is known that under weak fluctuation conditions, when the propagation path is unifor...

AI Technical Summary

Problems solved by technology

[0004] However, in practical applications, it is not easy to generate a uniform incoherent surface light source that can propagate over a long distance. The usual method is to place a near-infrared light-emitting diode at the focus of a spherical reflector, and approximate the reflector as a collection of point light sources. , this approach has the disadvantages of being invisible to the human eye and difficult to adjust, and it also limits the minimum measurable path length of the instrument

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