Results 251 to 260 of about 88,929 (292)

Silicon acoustic lens for scanning acoustic microscope (SAM)

TRANSDUCERS '91: 1991 International Conference on Solid-State Sensors and Actuators. Digest of Technical Papers, 2002
A single crystal silicon lens for a scanning acoustic microscope (SAM) has been developed by using lithography and chemical etching. Excellent sphericity and the minimal surface roughness demanded for a lens profile have been obtained through suitable etching.
H. Hashimoto, S. Tanaka, K. Sato
openaire   +1 more source

Acoustic Transducers and Lens Design for Acoustic Microscopy

1987
The transducer-lens system is one major component in the performance of an acoustic microscope. The design criteria for the various types of applications of an acoustic microscope are different. For surface imaging applications, it is desired to have a small spot size and low sidelobe level.
Chou, C.-H., Khuri-Yakub, B.
openaire   +2 more sources

Underwater imaging using acoustic lens

2015 IEEE Underwater Technology (UT), 2015
Acoustic vision systems are gaining prominence due to ocean surveillance for internal security along coastal waters, in particular defence and engineering. Image generation is an effective method for underwater target exploration. Underwater acoustic imaging systems can identify objects according to the characteristic information obtained from the ...
G. Suresh, V. Natarajan, A. Shanavas
openaire   +1 more source

Horn loudspeaker with acoustic lens

The Journal of the Acoustical Society of America, 1980
A moving coil loudspeaker of the type including a pair of co-axial speech coils, one for driving a high frequency diaphragm at the rear of the loudspeaker to provide an output along a horn and the other for driving a cone forming a continuation of the horn and reproducing the lower frequencies has an acoustic lens fitted in the region where the horn ...
Alex V. Garner, Graham Townsend
openaire   +1 more source

Acoustic Lens and Ultrasonic Probe Using the Lens

The Journal of the Acoustical Society of America, 2011
The invention has a structure, in an acoustic lens for an ultrasonic probe comprising leg portions which are connected by a planar shape, and a lens portion which is provided on the leg portions and has curvature in the lengthwise direction, wherein the leg portions are made from an attenuation prevention material having the less ultrasonic propagation
openaire   +1 more source

Underwater imaging with a moving acoustic lens

IEEE Transactions on Image Processing, 1998
The acoustic lens is a high-resolution, forward-looking sonar for three dimensional (3-D) underwater imaging. We discuss processing the lens data for recreating and visualizing the scene. Acoustical imaging, compared to optical imaging, is sparse and low resolution.
B, Kamgar-Parsi, L J, Rosenblum, E O, Belcher   +2 more
openaire   +2 more sources

Constant focal length acoustic lens

The Journal of the Acoustical Society of America, 1992
A temperature compensation system that adjusts the temperature of an acoustic lens fluid in a prescribed manner to maintain the index of refraction of the fluid constant relative to the surrounding water thereby maintaining the focal length of the lens constant over its operating temperature range.
openaire   +1 more source

Development Of The Acoustic Lens

SPIE Proceedings, 1988
The ability to "see" underwater is critical to underwater navigation, target detection, target identification, tracking and particularly protection of valuable access against potential saboteurs. From available open literature, it seems that underwater imaging development peaked in the 1960's and early 1970's.
openaire   +1 more source

Acoustic lens

The Journal of the Acoustical Society of America, 1996
Lothar Hartmann, Gerhard Buchhotz
openaire   +1 more source

Review of acoustic lens developments

The Journal of the Acoustical Society of America, 1977
Use of acoustic lenses in underwater applications spans many decades. Lord Rayleigh describes an acoustic lens as early as 1879. Some well-documented experimental lenses were developed by Williams in the 1940's at General Electric. This work with lenses and reflectors led to the development of the U. S.
openaire   +1 more source