Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1989-06-23
1990-08-14
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356336, 356343, 356 285, G01C 902
Patent
active
049482572
ABSTRACT:
Methods and apparatus for enhancing the accuracy of laser optical measuring instruments using fringe pattern spacing are disclosed. The apparatus in one embodiment includes a laser beam source 10, a beam splitter 14, and mirrors 22 to deflect the beams 18, 20 emitted from the beam splitter 14 to a sensing volume. Alternative embodiments include prisms 42, 44, gratings 62 or other optical devices in lieu of mirrors 22. Objects passing through the sensing volume scatter light which is detected by the instrument to determine, among other things, the velocity of the object. The emitted beams 18, 20 are automatically deflected in response to wavelength changes of the laser beam 16 such that variations in the fringe spacing, due to variations in laser beam 16 wavelength, are compensated by variations in the closing angle K of the emitted, deflected beams. The fringe pattern spacing is thereby held more nearly constant enhancing the accuracy of the instrument. Methods of enhancing the accuracy of measurements taken with laser optical measuring instruments are also disclosed.
REFERENCES:
patent: 3904835 (1975-09-01), Matsumoto
patent: 4030830 (1977-06-01), Holly
patent: 4334779 (1982-06-01), Domey et al.
patent: 4540283 (1985-09-01), Bachalo
patent: 4633714 (1987-01-01), Mazumder et al.
Chapter 1 and Sections 2.1 and 2.2 excerpted from Durrani and Greated, Laser Systems in Flow Measurement, Plenum Press (1977).
Article by Chang, Acoustooptic Devices and Their Applications, IEEE Transactions on Sonics and Ultrasonics, vol. SU-23, No. 1 (Jan. 1976).
Article by Lekavich, Basics of Acousto-Optic Devices, Lasers and Applications (Apr. 1986).
Bjorkquist Daniel C.
Dorman Frank D.
Finn Miles R.
Kaufman Stanley L.
McGraw Vincent P.
TSI Incorporated
Turner S. A.
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