Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1986-12-02
1989-04-04
Buczinski, Stephen C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
356152, 250201, G01P 336, G01B 1123, G01J 120
Patent
active
048181013
ABSTRACT:
A laser-Doppler velocimeter, for measuring the velocity of particles passing a test location, comprises first and second lasers for providing a measurement laser beam directed along a first axis and a guide laser beam that is parallel to the measurement beam. The guide beam and the measurement beam are directed towards a beam deflecting mirror that reflects the measurement beam along a second axis and reflects the guide beam parallel to the second axis. The orientation of the second axis relative to the first axis depends on the orientation of the mirror, and the orientation of the mirror is controlled by an electrical adjustment mechanism. The measurement beam is received by a beam-dividing device that directs the measurement beam along a third axis towards the test location. Light scattered from particles at the test location focused on a collection aperture which is stationary relative to the beam-dividing device. The guide beam also is received by the beam-dividing device and is directed towards a photodetector. The photodetector is stationary relative to the beam-dividing device and generates an electrical signal representative of the orientation of the third axis relative to the beam-dividing device. The output signal of the photodetector is fed back to the adjustment mechanism so as to maintain the third axis at a constant orientation relative to the beam-dividing device. Consequently, the test location remains focused on the collection aperture when the beam-dividing device moves, e.g., due to vibration.
REFERENCES:
patent: 3360987 (1968-01-01), Flower et al.
patent: 3382758 (1968-05-01), Wang
patent: 3446558 (1969-05-01), Seaton
patent: 3448406 (1969-06-01), McClure
patent: 3531204 (1970-09-01), Holland et al.
patent: 3532427 (1970-10-01), Paine
patent: 3548655 (1970-12-01), Rudd
patent: 3623361 (1971-11-01), Funk, Jr.
patent: 3709599 (1973-01-01), Iten
patent: 3723004 (1973-03-01), Brayton
patent: 3732013 (1973-05-01), Heislmair et al.
patent: 3799671 (1974-03-01), Schweizer
patent: 3915572 (1975-10-01), Orloff
patent: 4102572 (1978-07-01), O'Meara
patent: 4201467 (1980-05-01), Hartmann et al.
patent: 4281540 (1981-08-01), Lee et al.
patent: 4346994 (1982-08-01), Cruz
patent: 4483614 (1984-11-01), Rogers
patent: 4576480 (1986-03-01), Travis
patent: 4618759 (1986-10-01), Muller et al.
patent: 4627725 (1986-12-01), Nishio et al.
Douglas Gary D.
Soreide David C.
Buczinski Stephen C.
The Boeing Company
Wallace Linda J.
LandOfFree
Laser-doppler velocimetry does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Laser-doppler velocimetry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laser-doppler velocimetry will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-176671