Development of low-cost heterodyne interferometer with virtual electronic phasemeter

Chia Ming Jan, Chien Sheng Liu, Chen Yu Lin

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Commercial laser interferometers are conventionally used to measure the positioning error of a long linear stage in multiaxis computer numerical control machine tools. However, commercial laser interferometers are costly and difficult to use. Therefore, a low-cost photodetector-based heterodyne interferometer combined with an electronic phasemeter module was proposed for precise measurement of the positioning error of a long linear stage. The proposed heterodyne interferometer was combined with a virtual electronic phasemeter that employs a self-developed signal-processing technique. Our core algorithm and proposed photoelectric-signal-processing technique were developed using the LabVIEW human–machine interface. Moreover, to verify the performance of the proposed heterodyne interferometer, a laboratory-built prototype was constructed and used to measure the positioning error of a long linear stage. The experimental results indicated that the positioning accuracy of the proposed interferometer was ±4.5 μm for a linear stage with a displacement of 250 mm; the results obtained were comparable to those obtained with a commercially available laser interferometer. The proposed heterodyne interferometer can thus be used in other applications related to precision engineering.

Original languageEnglish
Pages (from-to)229-238
Number of pages10
JournalMeasurement and Control
Volume55
Issue number5-6
DOIs
Publication statusPublished - 2022 May

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Control and Optimization
  • Applied Mathematics

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