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Improved Sagnac interferometer and method for detecting wind field based on LCoS

An interferometer and remodeling technology, applied in measuring devices, scientific instruments, meteorology, etc., can solve the problem of low detection accuracy and achieve the effects of good seismic performance, wide spectral response range, and high transmittance

Inactive Publication Date: 2010-06-30
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a modified Sagnac interferometer based on LCoS, which solves the problem that the detection accuracy of the existing Michelson interferometer is not high when the multi-band auroral detection is carried out

Method used

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  • Improved Sagnac interferometer and method for detecting wind field based on LCoS
  • Improved Sagnac interferometer and method for detecting wind field based on LCoS
  • Improved Sagnac interferometer and method for detecting wind field based on LCoS

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] The present invention is based on the structure of the modified Sagnac interferometer of LCoS, as figure 1 As shown, including right-angled trapezoidal glass a1 and right-angled trapezoidal glass b2 glued on the bottom surface, the refractive indexes of right-angled trapezoidal glass a1 and right-angled trapezoidal glass b2 are different, and the top angles of right-angled trapezoidal glass a1 and right-angled trapezoidal glass b2 are both 45°. Playing the role of transverse shearing, the right-angled waist of the right-angled trapezoidal glass b2 drops a certain distance along the glued surface relative to the right-angled waist of the right-angled trapezoidal glass a1, and the glued surface is coated with a semi-reflective and semi-permeable film 6; the upper bottom of the right-angled trapezoidal glass a1 Coated with total reflectio...

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Abstract

The invention discloses an improved Sagnac interferometer based on LCoS, comprising right-angled trapezoidal glass and right-angled trapezoidal glass b which are glued together at the lower bottom surfaces, the right-angled waist surface of the right-angled trapezoidal glass b slumps along the gluing surface relatively to the right-angled waist surface of the right-angled trapezoidal glass a, and the gluing surface is plated with a semi-reflecting and semi-permeable membrance; the upper bottom surface of the right-angled trapezoidal glass a is plated with a total reflecting membrance a, the right-angled waist surface of the right-angled trapezoidal glass a is plated with a total reflecting membrance b, the upper bottom surface of the right-angled trapezoidal glass b is plated with a total reflecting membrance c, the right-angled waist surface of the right-angled trapezoidal glass b is provided with LCoS reflective liquid crystal, the inclined waist surface of the right-angled trapezoidal glass a is glued with a polarizer a, and the inclined waist surface of the right-angled trapezoidal glass b is glued with a polarizer b. The invention also discloses a detecting method which provides stepping phases for light of different wavelengths by applying different pressures to the LCoS reflective liquid crystal to modulate phases of incident light, thus detecting the atmospheric wind field. The interferometer and the method for detecting the wind field have little power consumption, good anti-seismic performance and considerable cost.

Description

technical field [0001] The invention belongs to the technical field of interferometric detection of upper atmosphere, in particular to a modified Sagnac interferometer based on LCoS, and also relates to a method for detecting atmospheric wind field by using the interferometer. Background technique [0002] The key technology of wide-angle Michelson (Wind Imaging Interferometer) WINDII (Wind Imaging Interferometer) is to use a wide-angle Michelson interferometer that can realize field of view compensation, and drive the mirror of one arm of the interferometer through piezoelectric ceramics to perform precise stepping , each step is a quarter of the wavelength, so that four images with different interference intensities can be obtained in one interference cycle, and the temperature, wind speed and volume emissivity of the target atmosphere can be retrieved by using the "four-intensity method". . [0003] Although WINDII is the most successful application of the wide-angle Mic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01W1/02
Inventor 唐远河郜海阳张瑞霞秦林朱赐
Owner XIAN UNIV OF TECH
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