NDLI: Improving pulsed dark field method to study ultrasonic phenomena

Content Provider	IEEE Xplore Digital Library
Author	Nunez, I. Arzua, A. Negreira, C.
Copyright Year	2003
Description	Author affiliation: Laboratorio de Acusto-Optica, Instituto de Fisica, Montevideo, Uruguay (Nunez, I.; Arzua, A.; Negreira, C.)
Abstract	Using pulsed dark field (PDF) method to analyze ultrasound fields presents some advantages with respect to the traditional Schlieren method, and with respect to the non-pulsed dark field method by I. Nunez and C. Negreira (1995) and I. Nunez and C. Negreira (1996). First, the circular black spot used to stop the zero-order of diffracted light (dark field method) allows us to observe phase modulations in all directions perpendicular to the propagation of the beam. The classical "knife edge" of the Schlieren method shows phase modulations principally in one direction. This one is normal to the edge of the knife and normal to the light beam. On the other hand, PDF method uses short time illumination triggered by the acoustic pulse. This allows observing elastic fields in pulsed regime and we can evaluate the evolution of such pulse inside homogeneous and heterogeneous media. In this paper, we apply PDF method to determine the conditions of change from single to multiple scattering. A 2.25 MHz transducer in water emits a wide-band ultrasonic pulse. By varying the distribution of scatterers (cylindrical wires of 1.2 mm diameter), it is possible to generate the conditions necessary for loosing coherence in the pulse. We use a 10 mW He-Ne, an acousto-optic modulator (Neos Bragg cell driven by Neos N21080) triggered by the acoustic pulse generator (Sonic), two lenses of focal length 850 mm and diameter 74 mm, a black spot of diameter 0.5 mm, a CCD camera (EDC-1000HR, Electrim Co.) with resolution 244x753 pixels.
Starting Page	2049
Ending Page	2052
File Size	766214
Page Count	4
File Format	PDF
ISBN	0780379225
DOI	10.1109/ULTSYM.2003.1293321
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-10-05
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Acoustic pulses Phase modulation Acoustic beams Acoustic scattering Light scattering Pulse generation Ultrasonic imaging Diffraction Acoustic propagation Optical propagation
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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