Digital frequency-modulation continuous wave interference laser driving and signal processing method and circuit

A signal processing circuit, frequency modulation continuous wave technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problems of low initial phase measurement accuracy of interference signals, small dynamic range of interferometers, etc., to improve dynamic range and high precision. , the effect of improving the measurement accuracy

Inactive Publication Date: 2019-01-01
XIAN TECHNOLOGICAL UNIV
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Problems solved by technology

Therefore, using an analog circuit, not only the initial phase measurement accuracy of the interfer

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  • Digital frequency-modulation continuous wave interference laser driving and signal processing method and circuit
  • Digital frequency-modulation continuous wave interference laser driving and signal processing method and circuit
  • Digital frequency-modulation continuous wave interference laser driving and signal processing method and circuit

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0025] The invention provides a digital FM continuous wave interference laser driving and signal processing method, which adopts an all-digital working mode, and uses a table look-up method to periodically read out the laser linear FM driving signal waveform data stored in the memory in advance by the microprocessor. , converted into an analog signal by DAC, amplified by an amplifier circuit, and finally driven by a voltage-controlled current source circuit to drive a semiconductor laser; the interference signal output by a frequency-modulated continuous wave interferometer is converted into an elec...

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Abstract

The invention provides a digital frequency-modulation continuous wave interference laser driving and signal processing method and circuit. The method is characterized by firstly, periodically readingdriving signal waveform data by a microprocessor through using a table look-up method, converting into an analog signal by a DAC, after being amplified by an amplification circuit, passing through a voltage-controlled current source so as to drive a semiconductor laser to generate a laser; then, converting an interference signal formed by the laser after passing through an interferometer into an electrical signal by a photoelectric detector, filtering and removing a noise via a preprocessing circuit, and converting into a periodic digital signal synchronized with the modulation period of a driving signal by the ADC; and finally, acquiring the frequency or the initial phase of a frequency modulation interference signal by the microprocessor according to the digital signal in the same periodthrough a digital phase discrimination algorithm. Through certain circuit implementation, the method and the circuit are compared with an analog frequency-modulation continuous wave interference laser driving and signal processing method and circuit, laser linear frequency modulation is easily acquired, the laser is prevented from being damaged, and high precision and large dynamic range measurement are realized.

Description

Technical field: [0001] The invention relates to the field of frequency modulation continuous wave laser interferometry, in particular to a digital frequency modulation continuous wave interference laser drive and signal processing method and circuit. Background technique: [0002] Frequency-modulated continuous wave laser interferometry is a new laser measurement technology that has emerged recently. It modulates the laser frequency in a linear form. The beat frequency interference signal, the frequency and initial phase of the beat frequency signal are related to the optical path difference of the two beams of light. Frequency-modulated continuous wave laser interference is different from traditional single-frequency laser interference. The beat-frequency interference signal obtained by frequency-modulated continuous wave interference is a dynamic signal. Therefore, it is very easy to subdivide the phase, determine the direction of phase change, and count the entire cycle....

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Application Information

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IPC IPC(8): G01B9/02
CPCG01B9/02083
Inventor 郑刚高明刘卫国张雄星陈海滨郭峰
Owner XIAN TECHNOLOGICAL UNIV
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