Consideration of Real-time Computation for Distance and Displacement by Digital Signal Processing using Optical Frequency Modulation

• Shinoda Yukitaka

  College of Science and Technology, Nihon University

• Higo Takashi

  College of Science and Technology, Nihon University

Bibliographic Information

Other Title

• 光周波数変調を用いたディジタル演算による距離·変位の実時間算出の検討
• 光周波数変調を用いたディジタル演算による距離・変位の実時間算出の検討
• ヒカリ シュウハスウ ヘンチョウ オ モチイタ ディジタル エンザン ニ ヨル キョリ ヘンイ ノ ジツジカン サンシュツ ノ ケントウ

Abstract

We have proposed a system employing digital signal processing for real-time measurement of distance, velocity and displacement by means of optical frequency modulation in the time domain. Optical system was composed of external cavity tunable diode laser whose optical frequency was modulated into the shape of triangle wave and the unbalanced Michelson interferometer with optical path difference (as distance) between measurement arm and reference arm. Measurement arm was displaced by mounted piezo-electrical transducer (PZT). Developed signal processing instruments were named Software Instruments. The Interface circuits of input and output part expanded digital signal processor were designed and manufactured. The digital signal processor calculates the phase change of optical frequency modulation from interference signal in the time domain. The phase change is converted into the distance, the velocity and the displacements. When Software Instruments operated with sampling frequency 80kHz, this system was able to perform the measurements in the period of 1.25ms.

Journal

• IEEJ Transactions on Fundamentals and Materials

  IEEJ Transactions on Fundamentals and Materials 123 (8), 770-777, 2003

  The Institute of Electrical Engineers of Japan

Keywords

• optical frequency modulation
• digital signal processing
• distance measurement
• displacement measurement

Details

• CRID: 1390001204594731520
• NII Article ID: 10011449921
• NII Book ID: AN10136312
• DOI: 10.1541/ieejfms.123.770
• ISSN: 13475533
• ISSN: 03854205
• NDL BIB ID: 6659490
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6659490
• Web Site: https://www.jstage.jst.go.jp/article/ieejfms/123/8/123_8_770/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed