Results 111 to 120 of about 582 (127)
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Diaphragm-type fiber-optic interferometric acoustic sensor
Optical Engineering, 2003A diaphragm-type fiber-optic acoustic sensor is developed. In such a sensor, the sound-induced strain is imposed on the fiber on the diaphragm-type sensing element, and can be measured by the use of a Mach-Zehnder interferometer. The diaphragm structure can provide di- rectional response with high sensitivity.
C.Z. Shi +4 more
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Process for the preparation of films or diaphragms for acoustic applications
The Journal of the Acoustical Society of America, 1996Process for the preparation of films or diaphragms for acoustic applications, exhibiting improved vibration properties, and films or diaphragms obtained by this process, particularly diaphragms for electro-mechanical transducers, particularly for loudspeakers.
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A new acoustic transducer with a pressure-deformed piezoelectric diaphragm
Sensors and Actuators A: Physical, 2012Abstract A new design for wide-band acoustic transducers is described. Radial tension is applied to a thin piezoelectric diaphragm with conductive electrodes on the upper and lower surface. One side of the diaphragm is pressurized, elastically deforming the diaphragm into a slightly curved shape. The in-plane static tension is modulated by applying a
Michael J. Anderson +3 more
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Experimental validation of the tuneable diaphragm effect in modern acoustic stethoscopes
Postgraduate Medical Journal, 2017ABSTRACTPurposeThe force with which the diaphragm chestpiece of a stethoscope is pressed against the body of a patient during an auscultation examination introduces the initial stress and deformation to the diaphragm and the underlying tissues, thus altering the acoustic parameters of the sound transmission path.
Karolina M Nowak, Lukasz J Nowak
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Spring-Loaded Diaphragm-Based Fiber Acoustic Sensor
Journal of Lightwave Technology, 2019We report a new fiber sensor utilizing a spring-loaded circular diaphragm to detect extremely weak acoustic waves. When exposed to an acoustic wave, the diaphragm vibrates parallel to itself relative to a stationary substrate. This vibration is detected interferometrically with a laser beam provided by a single-mode fiber placed ∼30 μm from the ...
Behrad Habib Afshar +1 more
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Analysis of acoustic characteristics according to design parameter of diaphragm
Journal of Materials Processing Technology, 2007Abstract The recent cellular phones provide various functions such as satellite TV receiver, motion picture player and MP3 player. For these multimedia effects, the acoustic quality through the microspeaker is important. Thus, the functions of microspeakers are included in the preference index of the cellular phones and more powerful and high ...
J.H. Kwon, Seong-Gyu Hwang
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Electro-acoustic transducer with high air permeable diaphragm
The Journal of the Acoustical Society of America, 1986An electro-acoustic transducer comprising a diaphragm (1) and means for shifting the high-frequency roll-off of the frequency-response characteristic of the transducer towards lower frequencies. This is accomplished by making the diaphragm (1) permeable to air, the permeability to air over the entire surface area of the diaphragm being such that at ...
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Loudspeaker having a unitary mechanical-acoustic diaphragm termination
The Journal of the Acoustical Society of America, 1982The periphery of the diaphragm of a loudspeaker is mechanically connected to a diaphragm support or basket by a layer of acoustic dampening-adhesive material. The layer of acoustic dampening-adhesive material covers a sufficient portion of the surfaces of the diaphragm to dampen standing waves which would otherwise reflect from the periphery of the ...
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Computer Simulation of Ion-Acoustic Shocks. The Diaphragm Problem
The Physics of Fluids, 1971Ion-acoustic shocks in the diaphragm problem are examined with a hybrid particle-in-cell computer simulation scheme that treats ions as particles and electrons as an isothermal fluid. Phase space plots and density profiles are given for flows from initial density jumps 1.2≤R = nI/nII≤15, with initial temperatures 1≤θ = Te/TiII≤60 and for times out to ...
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Photonic-crystal-diaphragm-based fiber-tip hydrophone optimized for ocean acoustics
, 2008 Onur Kilic +3 more
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