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Deep modulation optical rotation angle detection device and method based on photoelastic modulator

A photoelastic modulator and detection device technology, applied in the field of optical detection, can solve the problems of large influence of magnetic field fluctuation and temperature fluctuation, inability to realize large spot detection, extremely high system collimation requirements, etc., and achieves strong effective energy, high sensitivity, Effects with high modulation depth

Pending Publication Date: 2022-01-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Faraday modulation method uses a Faraday modulator, and its modulation angle is determined by the magnitude of the external magnetic field, which is greatly affected by magnetic field fluctuations and temperature fluctuations, and has low precision
The electro-optic modulator modulation method uses the electro-optic modulator to achieve extremely weak modulation angle modulation, but it has extremely high requirements for system alignment and cannot realize the detection of large spots

Method used

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  • Deep modulation optical rotation angle detection device and method based on photoelastic modulator
  • Deep modulation optical rotation angle detection device and method based on photoelastic modulator
  • Deep modulation optical rotation angle detection device and method based on photoelastic modulator

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Effect test

Embodiment 2

[0072] A method for installing a deep modulation optical rotation angle detection device based on a photoelastic modulator, comprising the following steps,

[0073] S11, place and adjust the optical head of the photoelastic modulator 5, so that the angle between the crystal fast axis of the photoelastic modulator 5 and the horizontal position is about 45°; place the laser 1 on the left side of the photoelastic modulator 5, so that The light emitted from the laser 1 passes through the center point of the crystal of the photoelastic modulator 5 at an incident angle of 10°-20°;

[0074] S12, place a polarizer 2 and a quarter-wave plate 4 in sequence between the laser 1 and the photoelastic modulator 5, rotate the polarizer 2 so that its transmission axis is at a horizontal position, and rotate the The quarter wave plate 4 makes the angle between its fast axis and the horizontal position 45°;

[0075] S13, on the right side of the photoelastic modulator 5, place the first reflector...

Embodiment 3

[0079] A method for calibrating the deep modulation optical rotation angle detection device based on the photoelastic modulator, performing the calibration of the total modulation angle of the optical path on the deep modulation optical rotation angle detection device based on the photoelastic modulator described in the above embodiment 1, comprising the following steps :

[0080] S21, using the installation method of the deep modulation optical rotation angle detection device based on the photoelastic modulator described in the above embodiment 2 to install the deep modulation optical rotation angle detection device based on the photoelastic modulator in embodiment 1;

[0081] S22, turn on the laser 1, and make the photoelastic modulator 5 in the working state; at this time, after the laser light generated from the laser 1 passes through the polarizer 2, the laser beam is an initial linearly polarized light. The combination of the quarter-wave plate 4 and the photoelastic mod...

Embodiment 4

[0091] A photoelastic modulator-based deep modulation optical rotation angle detection method, using the calibrated photoelastic modulator-based deep modulation optical rotation angle detection device to measure the optical rotation angle of the component to be measured, the specific steps are: The measuring element 3 is installed between the polarizer 2 and the quarter-wave plate 4 of the above-mentioned deep-modulation optical rotation angle detection device based on the photoelastic modulator after calibration, and collects and detects a one-fold frequency component of the electrical signal, Realize large-spot high-precision deep modulation detection.

[0092] The photoelastic modulator-based deep modulation optical rotation angle detection device of the present invention and its installation method, calibration method and detection method realize the reduction of the modulation angle of the photoelastic modulator, eliminate the limitation of the dead zone on the improvement...

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Abstract

A deep modulation optical rotation angle detection device and method based on the photoelastic modulators are provided, processed laser passes through the photoelastic modulators from the positive direction and the negative direction, equivalently, the processed laser sequentially passes through the two photoelastic modulators with identical phases, and the phases of modulation angles of the two photoelastic modulators are opposite, so that the modulation angles are reduced. The rotation angle error and the position error of the optical element are eliminated according to the direct current component, the first frequency multiplication component and the second frequency multiplication component, and the error angles of the polarizer, the polarization analyzer, the quarter-wave plate and the photoelastic modulator are effectively suppressed. The influence of the dead zone of the photoelastic modulator is eliminated, and the application range of the photoelastic modulator is expanded. Compared with a Faraday modulation method, the device and the method are high in sensitivity; compared with an electro-optical modulator, the device and the method have the advantages that large light spot detection can be realized; compared with a single photoelastic modulator, the device and the method have the advantages that the modulation depth is higher, the effective energy is stronger under the same output energy, and the detection sensitivity is higher.

Description

technical field [0001] The invention relates to the technical field of optical detection, in particular to a deep modulation optical rotation angle detection device based on a photoelastic modulator and an installation method, a calibration method and a detection method thereof. Background technique [0002] Photoelastic modulators use the crystal elastic effect to realize polarization modulation, and are widely used in precision measurement, circular dichroism detection and other fields. The basic parameter of the photoelastic modulator is the modulation angle (or peak phase delay), and the modulation angle determines the modulation depth (that is, the proportion of effective signal energy in the total output signal). Due to the limitation of crystal elastic performance, the modulation angle of existing commercial photoelastic modulators has a dead zone near the zero point, that is, the set value of the modulation angle is reduced in this area, but the actual modulation ang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
CPCG01M11/0207G01M11/0242
Inventor 房建成邢博铮陆吉玺韩邦成马宁
Owner BEIHANG UNIV