Transient temperature measurement of gas using fiber optic heterodyne interferometry

Nobuyuki Kawahara, Eiji Tomita, Hiroshi Kamakura

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

A fiber optical heterodyne interferometry system was developed to obtain high temporal resolution temperature histories of unburned and burned gases non-intrusively. The effective optical path length of the test beam changes with the gas density and corresponding changes of the refractive index. Therefore, the temperature history of the gas can be determined from the pressure and phase shift of the interference signal. The resolution of the temperature measurement is approximately 0.5 K, and is dependent upon both the sampling clock speed of the A/D converter and the length of the test section. A polarization-preserving fiber is used to deliver the test beam to and from the test section, to improve the feasibility of the system as a sensor probe. This optical heterodyne interferometry system may also be used for other applications that require gas density and pressure measurements with a fast response time, or a transient temperature record.

Original languageEnglish
JournalSAE Technical Papers
DOIs
Publication statusPublished - Jan 1 2001
EventInternational Spring Fuels and Lubricants Meeting and Exhibition - Orlando, FL, United States
Duration: May 7 2001May 9 2001

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering

Fingerprint Dive into the research topics of 'Transient temperature measurement of gas using fiber optic heterodyne interferometry'. Together they form a unique fingerprint.

  • Cite this