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

A technology of atmospheric refractive index and structural constant, which is applied in the field of remote sensing and atmospheric optics, and can solve problems such as difficult adjustment, invisible to human eyes, and small path length of instruments

Inactive Publication Date: 2010-05-26
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Claims
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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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  • Large-caliber laser isotope scanner and method for measuring structure constant atmosphere index of refraction
  • Large-caliber laser isotope scanner and method for measuring structure constant atmosphere index of refraction
  • Large-caliber laser isotope scanner and method for measuring structure constant atmosphere index of refraction

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Embodiment Construction

[0030] Please see attached figure 1 .

[0031] The large-aperture laser scintillation instrument for measuring the structural constant of the atmospheric refractive index adopts a symmetrical structure design, including two Newtonian reflective telescopes 1 with a diameter of 127mm and a focal length of 430.5mm set opposite to each other, and the lens barrel of the reflective telescope 1 respectively The set semiconductor laser 2 with a center wavelength of 645nm and an output power of 15mW has the advantages of small size, light weight, and easy integration; the laser 2 is connected to the modulation signal generator respectively, and in order to improve the system signal-to-noise ratio, the laser 2 is modulated by TTL To drive, two timers form a multivibrator circuit with adjustable frequency and duty cycle, adjust the circuit parameters, and output a square wave signal with a frequency of 10kHz and a duty cycle of 50%. When the oscillator circuit outputs a high level, the l...

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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 thetransmission 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 atanther 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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/41G01W1/00
Inventor 马晓珊朱文越饶瑞中
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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