Fiber optic laser probe for acoustic wave measurements

Journal Article · Mon Feb 15 04:00:00 EST 1982 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.93074· OSTI ID:6032255

Jungerman, R L; Bowers, J E; Green, J B; Kino, G S

An optical probe has been developed for acoustic surface waves using single-mode fiber to illuminate the sample. The scanned fiber probe has an effective spot size of 4 ..mu..m without the use of focusing lenses. 34% of the incident light re-enters the fiber from a specular reflector. The signal from the sample is combined with a reference in a single fiber, eliminating misalignment in the interferometric measurement. Experimental results are presented for a LiNbO/sub 3/ focused transducer surface acoustic wave (SAW) device. On this device, the probe exhibits 60-dB dynamic range and 3 x 10/sup -2/ A minimum sensitivity. The resolution, sensitivity, and flexibility of the fiber probe make it applicable to crack detection in nondestructive testing.

• Research Organization: Ginzton Laboratory, Stanford University, Stanford, California 94305
• OSTI ID: 6032255
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 40:4; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
ACOUSTIC MEASUREMENTS
ALIGNMENT
DATA
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EQUIPMENT
FIBER OPTICS
FOCUSING
INFORMATION
INTERFEROMETERS
LASER RADIATION
LENSES
MATERIALS TESTING
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MIRRORS
NONDESTRUCTIVE TESTING
OPTICAL EQUIPMENT
OPTICAL SCANNERS
OSCILLATION MODES
PROBES
RADIATIONS
REFLECTION
RESOLUTION
SENSITIVITY
SOUND WAVES
TESTING