Processing of digital signals

Details Processing of digital signals Processing of digital signals

1980-05-21

1981-08-18

Buczinski, S. C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

324 77B, 324 77H, 324 77J, 328140, G01P 336, G01R 2316, H03K 500

Patent

active

042843510

ABSTRACT:
A method of, and apparatus for, processing a digital electric signal composed of a train of discrete uniformly or non-uniformly shaped pulses to recover spectral information contained in the spacings between the pulses, in which the digital signal is applied to a SAW spectrum analyzer arranged to produce output signals the envelopes of which represent the power spectrum over a selected frequency range of constituent sample lengths of the digital signal, and the required spectral information then derived from these output signals, for example by integration thereof over a period of time.
The technique may be used in conjunction with a laser Doppler velocity measurement system in which each pulse of the digital signal represents the detection of a photon scattered from a moving object or particle in a scattering volume illuminated by laser light, the spacing between the pulses containing information regarding the velocity of movement of the object or particles under observation.

REFERENCES:
patent: 3939411 (1976-02-01), James
R. M. Huffaker et al., Proc. IEEE, vol. 58, No. 3, Mar. 1970.
C. Riva et al., Investigation of Ophthalmology, vol. 11, No. 11, Nov. 1972.
H. M. Gerard et al., IEEE Transactions on Microwave Theory and Techniques, vol. MTT 21, No. 4, Apr. 1973, p. 176.
C. C. Han, Rev. Sci. Instrum., vol. 49, No. 1, Jan. 1978.

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