Title :
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
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;
Conference_Titel :
Mechatronics and Automation, 2005 IEEE International Conference
Print_ISBN :
0-7803-9044-X
DOI :
10.1109/ICMA.2005.1626604
