Process and arrangement for the measurement of physical values o

Details Process and arrangement for the measurement of physical values o Process and arrangement for the measurement of physical values o

1996-05-10

1998-07-14

Hellner, Mark

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

G01P 336

Patent

active

057812837

ABSTRACT:
A process is provided for measuring physical values of light-scattering moving particles by means of laser Doppler anemometry and to a corresponding laser Doppler anemometer (LDA) with phase modulation. Generating a moving intensity-modulated superimposition signal in the measured volume of a LDA which is based on an uncomplicated driving of the phase modulator is achieved by having the phase modulator being driven by two sinusoidal driving signals with different frequencies (.omega..sub.1, .omega..sub.2) which are coupled so as to be fixed with respect to phase and frequency and wherein one frequency (.omega..sub.2) is an integer multiple of the other frequency (.omega..sub.1), and a filter frequency (f.sub.F) which is a common multiple of the two frequencies (.omega..sub.1, .omega..sub.2) is filtered out from the output signal of the receiver by a bandpass filter. For this purpose, one of two sidebands occurring in the output signal of the receiver is suppressed by the appropriate amplitude adjustment of the driving signals at the phase modulator. The process and related arrangement are used for measuring velocity in flowing media and for measurements of length and acceleration of solid surfaces.

REFERENCES:
patent: 4997272 (1991-03-01), Dopheide et al.
patent: 5048951 (1991-09-01), Combe et al.
J.E. Schroder, "Dual Sinusodal Modulation Scheme For Directional Laser Doppler Velocimeter" pp. 114-116, Electronics Letters, Jan. 29, 1987, vol. 23 No. 3.
Boda Ruck, "Laser Doppler Anemometrie", pp. 362-375, Laser und Optoelektronik, Oct. 4, 1985.
D.A. Jackson et al., "Extrinsic fibre-optic sensors for remote measurement", pp. 243-307, Oct. 5, 1986, vol. 18 No. 5.
Durst F., et al., "Removal of Pedestrals and Directional Ambiguity of Optical Anemometer Signals", Applied Optics, Nov. 1974, vol. 13 No. 11.
Minimierung der Messunsicherheit von Laser-Doppler-Anemometern, Jergern Czarske, et al., 1994, pp. 168-182.
Integrierte Optik, Wolfgang Karthe, et al., 1991, pp. 340-345.

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