DocumentCode :
2102531
Title :
Enhancement of SAW laser probe measurements by signal processing
Author :
Engan, H.E. ; Ronnekleiv, Arne
Author_Institution :
Dept. of Phys. Electron., Norwegian Univ. of Sci. & Technol., Trondheim, Norway
Volume :
1
fYear :
1999
fDate :
17-20 Oct. 1999
Firstpage :
217
Abstract :
Many different types of the SAW laser probe have been used for several years to characterize SAW devices as well as inherent properties of particular materials. Our laser probe is of a modified knife-edge type. Operating with a linear response, it has a high dynamic range. The probe provides full phasor information of the detected signal, and directional properties of the detection process makes it possible to determine the surface tilt components in two spatially orthogonal directions. We first sum up the basic characteristics of the probe. We show several examples where we take advantage of these features combined with signal processing techniques such as the fast Fourier transform. This enables us to concentrate on distinct properties of the devices under test. We thus exploit the spatial frequency domain and, in the basic detection process, the directions of the wavecrests, to enhance measurements of particular properties. Examples include results obtained from measurements on a selection of components containing various structures.
Keywords :
fast Fourier transforms; frequency-domain analysis; measurement by laser beam; surface acoustic wave signal processing; surface acoustic wave transducers; SAW laser probe; directional properties; fast Fourier transform; full phasor information; high dynamic range; linear response; measurement enhancement; modified knife-edge type probe; signal detection process; signal processing; spatial frequency domain; spatially orthogonal directions; surface tilt components; wavecrest directions; Dynamic range; Fast Fourier transforms; Frequency domain analysis; Optical materials; Probes; Signal detection; Signal processing; Surface acoustic wave devices; Surface acoustic waves; Testing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Ultrasonics Symposium, 1999. Proceedings. 1999 IEEE
Conference_Location :
Caesars Tahoe, NV
ISSN :
1051-0117
Print_ISBN :
0-7803-5722-1
Type :
conf
DOI :
10.1109/ULTSYM.1999.849389
Filename :
849389
Link To Document :
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