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Measuring method of temperature coefficient of photoelectric receiver based on acousto-optic amplitude modulation

A photoelectric receiver and testing method technology, applied in the field of laser applications, can solve the problems of no testing, no consideration of the temperature drift error of the electrical signal processing circuit, and the influence of the test accuracy of the heterodyne interference system.

Active Publication Date: 2016-04-27
HARBIN INST OF TECH
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AI Technical Summary

Problems solved by technology

However, this literature only considered the photodetector in the analysis, and did not consider the temperature drift error introduced by the electrical signal processing circuit as the temperature changes
[0004] At present, the research on the temperature characteristics of the photoelectric receiver only analyzes the temperature characteristics of the photodetection device in the photoelectric receiver. There is no analysis and experimental test of the temperature characteristics of the electrical signal processing circuit of the photoelectric receiver. Test the temperature characteristics of the photoelectric receiver when the input interference beat frequency is different
In actual use, the electrical signal processing circuit is affected by the temperature so that the output signal will have a certain phase drift with the temperature change, and when the input light intensity is different, the output signal will also have a certain phase drift. Ignoring this part of the error will affect the heterodyne Test accuracy of interferometric systems

Method used

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  • Measuring method of temperature coefficient of photoelectric receiver based on acousto-optic amplitude modulation
  • Measuring method of temperature coefficient of photoelectric receiver based on acousto-optic amplitude modulation

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Embodiment Construction

[0024] The examples of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] A method for testing the temperature coefficient of a photoelectric receiver based on acousto-optic amplitude modulation, the steps of the method are as follows:

[0026] (1) Put the standard photoelectric receiver 7 into the temperature-adjustable incubator A9, and put the photoelectric receiver 8 to be tested in the temperature-adjustable incubator B10. The temperature stability of the incubators A and B can reach ±0.1 °C, has no effect on the phase stability of the standard photoelectric receiver 7 and the photoelectric receiver 8 to be tested;

[0027] (2) The single-frequency laser 1 emits a beam of laser light, and after passing through the acousto-optic modulator 2, it becomes a beam including frequencies v 1 and v 2 The dual-frequency laser beam, the polarization directions are mutually orthogonal linearly polarized light in the horiz...

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Abstract

The invention belongs to a laser application technology, and relates to a photoelectric receiver temperature coefficient test method based on acousto-optical amplitude modulation. The method includes using a single-frequency laser as a light source, outputting an amplitude-adjustable double-frequency laser after the single-frequency laser passes an acousto-optical modulator, utilizing a non-polarized beam splitting prism for beam splitting, and testing phase difference between a to-be-tested photoelectric receiver and a reference photoelectric receiver at different temperatures to obtain temperature coefficient of the to-be-tested photoelectric receiver. Phases of a reference light beam and a measurement light beam are unaffected by external environment changes in testing, extra phase errors are not introduced, test accuracy is high, and the temperature coefficient of photoelectric receivers in different light intensities can be tested by means of adjusting light intensity of the double-frequency laser.

Description

technical field [0001] The invention belongs to laser application technology, and mainly relates to a method for testing the temperature coefficient of a photoelectric receiver based on acousto-optic amplitude modulation. Background technique [0002] Due to its high sensitivity, high precision and non-contact characteristics, laser interferometry occupies an increasingly important application position in the fields of precision and ultra-precision processing, microelectronics equipment, nanotechnology and other cutting-edge industrial equipment and national defense equipment, and has been widely used . [0003] In the laser heterodyne interferometry system, the photoelectric receiver plays an important role in realizing signal reception and signal conversion, and its performance, especially the temperature drift characteristics, will directly affect the measurement stability and measurement accuracy of the entire measurement system. In order to study the temperature drift ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J9/02
Inventor 谭久彬胡鹏程杨千惠
Owner HARBIN INST OF TECH
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