A Study of the Semiconductor Laser 2-Focus Velocimeter

Hironobu Ueki, Masahiro Ishida, Tadaharu Mitsutake

Research output: Contribution to journalArticlepeer-review


A compact laser velocimeter was newly developed based on the principle of a flight-time measurement. A semiconductor laser with the maximum power of 40 mW and wavelength of 830 nm was utilized as a light source, and photodiodes were used to detect the scattered light from seeding particles. The time-of-flight between 2 focus points was measured by a digital counter and was transferred to a personal computer to calculate the flow velocity. The air flow velocity at a nozzle exit was measured by this semiconductor laser 2-focus velocimeter and was compared with the results measured simultaneously by a Pitot tube. Consequently, it was confirmed that a laser 2-focus velocimeter by means of a semiconductor laser could be a useful and low-cost optical measuring instrument.

Original languageEnglish
Pages (from-to)516-519
Number of pages4
JournalTransactions of the Japan Society of Mechanical Engineers Series B
Issue number534
Publication statusPublished - 1991
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering


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