Limited distance isoplanatie angle real-time measurement apparatus and method thereof
A limited-distance, real-time measurement technology, applied in measuring devices, measuring angles, surveying and navigation, etc., can solve the problems of difficult evaluation of measurement accuracy, difficult operation, and low temporal and spatial resolution
Active Publication Date: 2015-07-15
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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However, as we all know, high-spatial-resolution and high-precision turbulence profilers have always been a hot and difficult issue in the field of atmospheric turbulence; the current turbulence profilers have complex structures, are not easy to operate, and have low temporal-spatial resolution. Measurement accuracy is difficult to assess
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specific Embodiment 1
[0048] Suppose the finite distance of turbulence to be measured is L=15km, and the point beacon used is wavelength λ 0 = Laser light at 532nm.
[0049] ①, Measuring device design. According to the condition D≈(λ 0 L) 0.5 , substitute L=15km, λ 0 =532nm, first select the sub-hole diameter D to be 9cm. by condition d 1 =1.2D,d 2 =2.3D, the distance can be d 2 The transverse dimension of the two holes of the PTZ is at least 3.3D=29.7cm, so the light aperture of the receiving telescope cannot be lower than this value. The telescopes under this caliber are basically cassette telescopes. Considering the obstruction of the central secondary mirror, the other sub-hole It can be placed arbitrarily in the annular light-transmitting part, as long as the center distance between this hole and any other hole satisfies d 1 = 1.2D. figure 2 An illustration of an example of a three-hole mask that meets the needs. Considering the light transmission of the sub-aperture and the portabi...
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The invention discloses a limited distance isoplanatie angle real-time measurement apparatus and a method thereof, and relates to the field of light wave atmosphere transmission. The method comprises the following steps: three circular sub-pupils (arranged on a three-hole surface cover) arranged at the front end of a telescope system receive dot signal light intensity, wedge mirrors are arranged on any two sub-pupils to divide incident light into three light beams corresponding to the three sub-pupils, and the three light beams pass through some optical elements and are finally received by a photoelectric detector; and received light spot intensity and mass center are obtained through computer processing, and statistics of the relative light intensity fluctuating covariance and the differential image motion variance of the two sub-holes is carried out to respectively obtain the limited distance isoplanatie angle and the spherical wave atmospheric coherence length. The method has the advantages of simplicity, easy implementation, real-time continuous measurement of the limited distance isoplanatie angle, and obtaining of the atmospheric coherence length, and is of great significance in the fields of adaptive optics, high resolution imaging, laser atmospheric transmission and the like.
Description
technical field [0001] The invention belongs to the field of light wave atmospheric transmission and relates to the measurement of atmospheric optical turbulence parameters, in particular to a real-time measurement device and method for limited-distance equi-halo angles. Background technique [0002] When light waves are transmitted in the atmosphere, due to the influence of atmospheric optical turbulence (the random fluctuation of atmospheric refractive index), the wavefront of light waves will be distorted and the intensity will fluctuate. Angle anisotropy refers to the difference between the phases of two beams of light with a certain angle, which is caused by passing through different paths of atmospheric turbulence. Equihalation angle, which characterizes the magnitude of angular anisotropy, within this angle range the phase distortion caused by atmospheric turbulence can be considered to be basically the same, beyond this range, the angular anisotropy error is large, a...
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IPC IPC(8): G01C1/00
CPCG01C1/00
Inventor 于龙昆侯再红吴毅秦来安靖旭何枫张巳龙谭逢富
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI