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 :
Johns Hopkins Univ., Baltimore
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 :
displacement measurement; remote sensing by laser beam; vibration measurement; vibrations; photoelectromotive-force sensors; pulsed laser vibrometer; reference vibration; surface displacement measurement; surface quality; vibrating surface; Acoustic beams; Displacement measurement; Frequency; Laser beams; Optical pulses; Phase modulation; Power lasers; Pulse measurements; Surface emitting lasers; Vibrometers;
Conference_Titel :
Lasers and Electro-Optics, 2007. CLEO 2007. Conference on
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-55752-834-6
DOI :
10.1109/CLEO.2007.4453349
