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Method for expanding frequency-modulated continuous wave interferometry measurement range

A frequency-modulated continuous wave and laser interference technology, which is applied in optical radiation measurement, measuring devices, and measuring optics, can solve problems such as limited measurement range, and achieve the goal of expanding the measurement range, reducing the front dead zone, and eliminating the rear dead zone. Effect

Active Publication Date: 2019-10-25
XIAN TECHNOLOGICAL UNIV
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Problems solved by technology

[0003] The present invention proposes a method for expanding the measurement range of frequency-modulated continuous wave laser interference to overcome the problem of limited measurement range of frequency-modulated continuous wave laser interference in the prior art

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  • Method for expanding frequency-modulated continuous wave interferometry measurement range

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Embodiment

[0021] Embodiment: a kind of method of enlarging frequency modulation continuous wave laser interferometry measuring range, comprises the following steps:

[0022] Step 1: For digital semiconductor laser frequency modulation continuous wave interference modulation and demodulation system, the laser drive signal is obtained by reading the data table by the microprocessor and then converted by the DA circuit. The data includes two parts, the average value and the linear modulation data, and the linear modulation The data are interpolated according to a straight line with slope k. The interference signal is a digital signal obtained by converting the optical signal into an electrical signal by a photodetector and then converted by an AD circuit. By measuring the minimum value point (or maximum value point) of the interference signal waveform in each modulation cycle on the time axis The position of the interference signal can be calculated to beat frequency. see figure 1 , the ...

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Abstract

The invention relates to the technical field of optical frequency-modulated continuous wave interferometry, particularly to a method for expanding a frequency-modulated continuous wave interferometrymeasurement range. A dynamic beat frequency signal is obtained by the frequency-modulated continuous wave laser interference; and the frequency and initial phase are related to an optical path difference between signal light and reference light in the interferometer. When the optical path difference is small or large, an initial phase or optical path difference can not be identified normally and accurately, so that the frequency-modulated continuous wave laser interference has two dead zones. The beat frequency of a current interference signal is measured to change a laser frequency modulationdegree of a frequency-modulated continuous wave laser light source, so that the beat frequency of the interference signal is always within a frequency range with effective phase identification. The method has the following advantages: the front dead zone in a small optical path difference state is reduced and a rear dead zone in a large optical path difference state is eliminated, so that the frequency-modulated continuous wave laser interference measuring range can be expanded substantially.

Description

Technical field: [0001] The invention relates to the technical field of optical frequency modulation continuous wave interferometry, in particular to a method for expanding the range of frequency modulation continuous wave laser interferometry. Background technique: [0002] Optical frequency modulated continuous wave (FMCW) interferometry is a new precision measurement technique. This optical interferometry technique uses a laser light source whose optical frequency is periodically and continuously linearly modulated. When the signal light and the reference light meet and interfere in the interference device, the generated interference signal is a dynamic beat frequency signal, and its frequency and initial phase are related to the optical path difference between the signal light and the reference light. When the optical path difference is small, due to the low beat frequency, it may not be possible to identify the initial phase and its changing direction. Theoretical anal...

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Application Information

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IPC IPC(8): G01J9/02
CPCG01J9/02G01J2009/0249
Inventor 郑刚张雄星孙彬高明刘卫国
Owner XIAN TECHNOLOGICAL UNIV
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