Patent · US Expired

High accuracy semiconductor laser doppler velocimeter

US4919532A · kind A · utility

16Cited by
4References
12Claims
0Family size

Inventors

Key dates

Filing dateAug 15, 1988
Grant dateApr 24, 1990
Priority date—
Expiry dateAug 15, 2008

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01S7/499
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A Doppler velocimeter having a semiconductor laser which sends a laser beam through a polarization beam splitter onto an fractional-wavelength plate. The plate both reflects the beam back to the polarization beam splitter and sends the beam on through the beam expander to the target. The beam is returned by the target. The returned beam passes through the fractional-wavelength plate to the polarization beam splitter. The returned and reflected beams are directed by the splitter to a detector. The detector mixes the beams and sends a signal to a spectrum analyzer on which the velocity of the target can be accurately determined.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.