Absolute distance measurement using frequencysweeping heterodyne interferometer calibrated by an optical frequency comb

Xuejian Wu, Haoyun Wei, Hongyuan Zhang, Libing Ren, Yan Li, Jitao Zhang

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

We present a frequency-sweeping heterodyne interferometer to measure an absolute distance based on a frequency-tunable diode laser calibrated by an optical frequency comb (OFC) and an interferometric phase measurement system. The laser frequency-sweeping process is calibrated by the OFC within a range of 200 GHz and an accuracy of 1.3 kHz, which brings about a precise temporal synthetic wavelength of 1.499 mm. The interferometric phase measurement system consisting of the analog signal processing circuit and the digital phase meter achieves a phase difference resolution better than 0.1 deg. As the laser frequency is sweeping, the absolute distance can be determined by measuring the phase difference variation of the interference signals. In the laboratory condition, our experimental scheme realizes micrometer accuracy over meter distance.

Original languageEnglish (US)
Pages (from-to)2042-2048
Number of pages7
JournalApplied Optics
Volume52
Issue number10
DOIs
StatePublished - Apr 1 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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