Laser Doppler Vibrometry system using the synthetic-heterodyne interferometric demodulation scheme implemented on a CMOS DSP camera

Author

Connelly, M.J. ; Szecówka, P.M. ; Jallapuram, R. ; Martin, S. ; Toal, V. ; Whelan, M.P.

Author_Institution

Opt. Commun. Res. Group, Univ. of Limerick, Limerick

fYear

2008

fDate

25-25 July 2008

Firstpage

133

Lastpage

136

Abstract

A laser Doppler vibrometer (LDV) is described which uses a CMOS digital camera, incorporating a digital signal processor, to carry out real-time signal processing of the interferometer output to allow multipoint LDV to be implemented. The synthetic-heterodyne technique is used to overcome the interferometric fading effect due to slow environmental changes. Vibration frequencies up to 100 Hz were detected successfully.

Keywords

CMOS image sensors; Doppler measurement; demodulation; interferometry; signal processing; vibration measurement; CMOS; DSP camera; digital camera; digital signal processor; laser Doppler vibrometry system; real-time signal processing; synthetic-heterodyne interferometric demodulation; vibration frequencies; CMOS image sensors; Cameras; Demodulation; Digital signal processing; Diode lasers; Frequency; Laser beams; Optical interferometry; Optical signal processing; Phase shifting interferometry;

fLanguage

English

Publisher

ieee

Conference_Titel

Communication Systems, Networks and Digital Signal Processing, 2008. CNSDSP 2008. 6th International Symposium on

Conference_Location

Graz

Print_ISBN

978-1-4244-1875-6

Electronic_ISBN

978-1-4244-1876-3

Type

conf

DOI

10.1109/CSNDSP.2008.4610788

Filename

4610788