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
CountryChina
CityHefei
Period02-08-1102-08-16

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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