Abstract

A new laser Doppler particle measuring method which resists additive Gaussian noises is proposed. Particles are forced-vibrated by nonsinusoidal waves with fixed bispectral characteristics, and the responses are measured by using a velocity measuring system which consists of the optics of a laser Doppler velocimeter, FM discriminator, and a bispectral analyzer. Application of bispectral analysis is very effective in eliminating additive Gaussian noise even when the power of noise is fairly large. The principle, practical construction, and some experimental results are shown. The results show clearly the effectiveness of the method.

© 1978 Optical Society of America

Laser Doppler particle measuring system using forced vibration synchronized detection and power spectral analysis

Takuso Sato, Tadao Kishimoto, and Kimio Sasaki
Appl. Opt. 17(2) 230-234 (1978)

Laser Doppler vibration measuring system using bispectral analysis

Osami Sasaki, Takuso Sato, and Tetsuya Oda
Appl. Opt. 19(1) 151-153 (1980)

New 3-D laser Doppler velocimeter using cross-bispectral analysis

Takuso Sato and Osami Sasaki
Appl. Opt. 17(24) 3890-3894 (1978)

Simultaneous determination of particle size and density by LDV

Osami Sasaki, Takuso Sato, and Tetsuya Oda
Appl. Opt. 19(15) 2565-2568 (1980)

Real time Doppler imaging system using forced vibration of the object

Takuso Sato, Yutaka Nakatani, and Mitsuhiro Ueda
Appl. Opt. 16(5) 1263-1267 (1977)