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Polarized optical scanner

A technology of polarization optics and scanners, applied in the field of optical scanning holography, can solve problems such as complex electronic systems, and achieve the effect of fast speed and simple structure

Inactive Publication Date: 2013-04-10
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the use of acousto-optic modulation and filtering, sine beat frequency and cosine beat frequency demodulation to obtain sine holographic signals and cosine holographic signals to realize the synthesis of complex holographic signals, the electronic system of this optical scanning holographic method is particularly complicated

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  • Polarized optical scanner
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Embodiment Construction

[0013] The present invention will be further described below in conjunction with accompanying drawing, but should not limit protection scope of the present invention with this,

[0014] figure 1 The structural principle diagram of the polarization optical scanner of the present invention is given. As shown in the figure, the embodiment of the polarization optical scanner of the present invention is made up of following components: laser 1, the first polarization beam splitter 2, the first optical path diaphragm 3, the second optical path diaphragm 4, the first optical path lens 5 , second optical path lens 6, polarization beam combiner 7, 2-D beam scanner 8, object 9, second polarization beam splitter 10, first half-wave plate 11, second half-wave plate 12, 2×4 90 ° Optical bridge 13, A-way balanced detector 14, B-way balanced detector 15, data acquisition card 16 and computer 17. The positional relationship of the above components is as follows: the beam output by the laser...

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Abstract

A polarized optical scanner comprises a scanning part and a receiving part. The scanning part comprises: a laser, a polarization beam splitter, a first optical path diaphragm, a first optical path lens, a second optical path diaphragm, a second optical path lens, a polarization combiner, a 2-D optical beam scanner and an object. The receiving part comprises: the polarization beam splitter, two half-wave plates, a 2x4 90 degree optical bridge, two balanced detectors, a data acquisition card and a computer. In the invention, an optical method of a polarizer and the 2x4 90 degree optical bridge is used to acquire sine holography and cosine holography of the three-dimensional object. The computer pluralizes the sine holography and the cosine holography into the plural holography. Then a matched filtering algorithm is used to process the plural holography signal so that image reproduction of the three-dimensional object can be reconstructed and there is no twin image noise. In the invention, a complex electronic modulation and demodulation system is not needed. A structure is simple and a speed is fast.

Description

technical field [0001] The invention relates to optical scanning holographic technology, in particular to a polarization optical scanner. Background technique [0002] Optical scanning holography uses a beam of plane waves and a beam of spherical waves. One of the beams is modulated by an acousto-optic modulator to introduce a frequency shift in time and frequency. After the object is reflected or transmitted, it is received by the photodetector and converted into an electrical signal. The electrical signal is then processed by complex electronic systems such as filtering, amplification, and demodulation to obtain digital sine holographic signals and cosine holographic signals, which are sent to the computer for matching filtering or sent to the electrical addressing spatial light modulator for diffraction reconstruction. image of the object. The existence of twin images can be eliminated by using the complex holographic signal synthesized by the sinusoidal holographic sig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/28G03H1/04
Inventor 朱梅娟戴恩文闫爱民孙建锋刘立人
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI