Signal power spectrum distribution in torsional vibration measurement of aeroengine

Author

Deyuan, Luo ; Dongxing, Qin ; Shengyang, Luo ; DaGui, Huang

Author_Institution

Sch. of Mechatronics Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

1

fYear

2005

Firstpage

532

Abstract

An optical field coherence function of composite speckle field in torsional vibration of aeroengine based on Doppler principle is obtained. Meanwhile, according to the relation between optical field coherence function and optical intensity coherence function, the optic field coherence function of composite speckle field as well as the coherence function of output current of photodetector is derived. Through carrying out the Fourier transformation of the optical intensity coherence function of composite speckle field, the power spectrum distribution of signal in torsional vibration of aeroengine is determined. In the case of the best measuring accuracy, the optimum laser spot radius is inferred.

Keywords

Fourier transform optics; aerospace engines; light coherence; photodetectors; torsion; vibration measurement; Doppler principle; Fourier transformation; aeroengine; optic field coherence function; optical field coherence function; optical intensity coherence function; optimum laser spot radius; photodetector; signal power spectrum distribution; torsional vibration measurement; Adaptive optics; Aerodynamics; Electric breakdown; Light scattering; Mechatronics; Optical scattering; Speckle; Surface emitting lasers; Velocity measurement; Vibration measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Mechatronics and Automation, 2005 IEEE International Conference

Print_ISBN

0-7803-9044-X

Type

conf

DOI

10.1109/ICMA.2005.1626604

Filename

1626604