Optical Doppler measurements
作者:
T. James Belich,
Ryan P. Lahm,
Richard W. Peterson,
Chad D. Whipple,
期刊:
American Journal of Physics
(AIP Available online 1997)
卷期:
Volume 65,
issue 3
页码: 186-190
ISSN:0002-9505
年代: 1997
DOI:10.1119/1.18528
出版商: American Association of Physics Teachers
关键词: 42.;03.40;01.50.P
数据来源: AIP
摘要:
Light from a low-cost He–Ne laser is filtered to provide a single-mode beam of long coherence length. Beat frequencies in the 100- to 500-kHz range are produced by superimposing laser radiation and waves which are Doppler shifted by a moving retroreflector. Varying speeds of a model train mounted reflector are independently measured with a photogate and allow a check of the Doppler predicted speed, or the photogate determined speed can be used to measure the laser wavelength by a fit of data points with a resulting standard deviation of less than 0.5% of λ. A frequency to voltage converter allows direct velocity plots for constant acceleration or simple harmonic motion.
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