A Novel Analog Interpolation Method for Heterodyne Laser Interferometer

Chang, Cheng-Yuan; Chang, Syuan-Cheng; Wang, Yung-Cheng; He, Pin-Yi

doi:10.3390/mi14030696

Cited by 1 publication

(1 citation statement)

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“…The resulting signals are then digitized using an analogto-digital converter (ADC) and processed via a phase solution algorithm and subdivision process. The displacement result is obtained from the phase information [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Real-Time Direction Judgment System for Dual-Frequency Laser Interferometer

Zeng,

Chen,

et al. 2024

Sensors

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Current real-time direction judgment systems are inaccurate and insensitive, as well as limited by the sampling rate of analog-to-digital converters. To address this problem, we propose a dynamic real-time direction judgment system based on an integral dual-frequency laser interferometer and field-programmable gate array technology. The optoelectronic signals resulting from the introduction of a phase subdivision method based on the amplitude resolution of the laser interferometer when measuring displacement are analyzed. The proposed system integrates the optoelectronic signals to increase the accuracy of its direction judgments and ensures these direction judgments are made in real time by dynamically controlling the integration time. Several experiments were conducted to verify the performance of the proposed system. The results show that, compared with current real-time direction judgment systems, the proposed system makes accurate judgements during low-speed motions and can update directions within 0.125 cycles of the phase difference change at different speeds. Moreover, a sweep frequency experiment confirmed the system’s ability to effectively judge dynamic directions. The proposed system is capable of accurate and real-time directional judgment during low-speed movements of a table in motion.

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