Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1986-03-31
1987-10-06
Buczinski, Stephen C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
350163, 350174, 350572, 350573, G01P 336, G02B 2700
Patent
active
046979220
ABSTRACT:
A laser velocimeter (12) has a laser beam generator (18) for generating first and second laser beams (20, 22) having a waist (40) of reduced cross-section area. A first focusing lens (28) has a first focal length F1 for focusing the first and second laser beams (20, 22) so that their waists focused by the lens (28) intersect at a focal point (26) at which a measurement is to be made. A second focusing lens (30) is positioned between the laser beam generator (18) and the first focusing lens (28). The second focusing lens (30) has a second focal length F2. The second focusing lens (30) is positioned from the first focusing lens (28) at a distance corresponding to a sum of the first and the second focal lengths F1 and F2. A third focusing lens (36) having a third focal length F3 is positioned between the laser beam generator (18) and the second lens (30). The third lens (36) is positioned from the second lens (30) a distance corresponding to the sum of the second and third focal lengths F3 and F2. The third focusing lens (36) is positioned in front of the beam waists (40) formed by the laser beam generator (18) a distance corresponding to the third focal length F3. The focusing lenses (28, 30 and 36) coact to focus the laser beams (20, 22) so that their waists intersect at a first focus spot of size W1. The second and third lenses (30, 36) are interchangeable in position by pivoting about a point between them to focus the laser beams (20, 22) so tat their waists intersect at a second focus spot size W2 different than the first focus spot size W1. Photodetector (31) is connected to computer (41), which processes signals derived from scattered light by the photodetector (31) to give measurements of the scattered light.
REFERENCES:
patent: 3588439 (1971-06-01), Heller et al.
patent: 3825346 (1974-07-01), Rizzo
patent: 3895872 (1975-07-01), Dandliker et al.
patent: 4148585 (1979-04-01), Bargeron et al.
patent: 4263002 (1981-04-01), Sathyakumar
patent: 4346990 (1982-08-01), Rhodes
patent: 4470696 (1984-09-01), Ballard
patent: 4506979 (1985-03-01), Rogers
Anderson, Jr. Alma G.
Donaldson Ralph W.
Gunter, Jr. William D.
Brekke Darrell G.
Buczinski Stephen C.
Manning John R.
The United States of America as represented by the Administrator
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