Development of a new optical heterodyne microscopes for fluid velocity measurements in a micro-channel

Yu Lung Lo, Gi Shing Chuang, Han Sheng Chuang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

An experiment based on a new optical heterodyne interferometer with microscopic probe has been developed in order to measure the fluid velocity in a micro-channel. By implementing laser Doppler anemometry (LDA) into a microscope, the laser beams are transmitted and then focused on the spot with an extremely highly spatial resolution over an area in 10 μ m diameter. The laser beams are modulated by a diffractive grating in sinusoidal backward and forward movement using a PZT stack, and the standard heterodyne signal, therefore, is recovered by a new demodulation system. In this study, nano-size of particles in 75 μm inner diameter of a micro-channel is driven by a LC pumping. As a result, the trace of velocity of particles can be recorded by a new optical heterodyne microscope. As compared to the other existing heterodyne techniques applied in the fluid velocity measurements, this new technique shows a better frequency response, a wider modulation frequency and an easier and cheaper setup. This setup, however, is limited by the performance of a PZT stack that is used to modulate a diffractive grating. In conclusion, a laser Doppler microscope implemented by a new heterodyne technique is a practical instrument for the micro fluid investigations, especially in MEMS and biological researches.

Original languageEnglish
Title of host publicationProceedings of the Second International Symposium on Instrumentation Science and Technology
EditorsK.-C. Fan, F. Yetai, K-.C. Fan, F. Yetai
Pages4/649-4/653
Publication statusPublished - 2002 Dec 1
EventProceedings of the International Symposium on Precision Mechanical Measurement - Hefei, China
Duration: 2002 Aug 112002 Aug 16

Publication series

NameProceedings of the Second International Symposium on Instrumentation Science and Technology

Other

OtherProceedings of the International Symposium on Precision Mechanical Measurement
Country/TerritoryChina
CityHefei
Period02-08-1102-08-16

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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