Title :
Seismic Exploration with VCSEL Based on Doppler Self-Mixing Effect
Author :
Lei, Shao ; Bo, Zhu ; Liu Fenglian ; Liu Hongli
Author_Institution :
Tianjin Univ. of Technol., Tianjin, China
Abstract :
In order to improve the resolution of seismic exploration, a self-mixing semiconductor laser measurement system based on VCSEL is proposed in this paper. Both the most principle frequency method based on short time Fourier transform and the modulus maximum method based on wavelet transform are employed to identity Doppler signal and restrain noise effectively. By technique of triangle-wave current modulation, the direction of motion can be discerned accurately. In comparison with experimental data of normal vibration platform, the relative error of measurement is less than 1%.
Keywords :
Fourier transforms; geophysical techniques; seismology; wavelet transforms; Doppler frequency shift; Doppler self-mixing effect; Doppler signal; Fourier transform; VCSEL; modulus maximum method; principle frequency method; seismic exploration; self-mixing semiconductor laser measurement system; triangle-wave current modulation; wavelet transform; Fourier transforms; Frequency; Laser noise; Seismic measurements; Semiconductor device noise; Semiconductor lasers; Signal resolution; Vertical cavity surface emitting lasers; Vibration measurement; Wavelet transforms;
Conference_Titel :
Photonics and Optoelectronic (SOPO), 2010 Symposium on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-4963-7
Electronic_ISBN :
978-1-4244-4964-4
DOI :
10.1109/SOPO.2010.5504381
