Title :
Absolute surface displacement measurement using pulsed photo-electromotive-force laser vibrometer
Author :
Chen, Zhongyang ; Khurgin, Jacob ; Rodriguez, Ponciano ; Lorenzo, Jose ; Trivedi, Sudhir ; Jin, Feng ; Wang, Chen-Chia ; Libbey, Brad ; Habersat, James
Author_Institution :
Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
Abstract :
We demonstrate experimentally a new technique for measuring unambiguously the surface displacement of a vibrating surface using a high sensitivity pulsed laser vibrometer based on the photo-electromotive-force (photo-EMF) sensors. By intentionally introducing a reference vibration with known frequency and amplitude, we show that the photo-EMF pulsed laser vibrometer is able to determine the absolute value of surface displacement independent of the test subject¿s surface quality and the amount of laser power density impinging on the sensor.
Keywords :
Acoustic beams; Displacement measurement; Frequency; Laser beams; Optical pulses; Phase modulation; Power lasers; Pulse measurements; Surface emitting lasers; Vibrometers;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 2007. QELS '07
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
978-1-55752-834-6
DOI :
10.1109/QELS.2007.4431126
