scholarly journals High efficiency ultrasonic sound source in air.

1980 ◽  
Vol 1 (3) ◽  
pp. 209-210
Author(s):  
Y. Sasaki ◽  
K. Matsuzawa ◽  
M. Ochi ◽  
T. Hasegawa
Keyword(s):  
Sound Source ◽  
High Efficiency ◽  
Ultrasonic Sound

Calibrated Ultrasonic Sound Source

1970 ◽  
Vol 41 (10) ◽  
pp. 1507-1509 ◽  
Author(s):  
Wayne R. Babcock ◽  
Robert W. Hermsen
Keyword(s):  
Sound Source ◽  
Ultrasonic Sound

scholarly journals Study on the Non-contact Acoustic Inspection Method for Concrete Structures by using Strong Ultrasonic Sound source

2015 ◽  
Vol 70 ◽  
pp. 398-401 ◽  
Author(s):  
Tsuneyoshi Sugimoto ◽  
Itsuki Uechi ◽  
Kazuko Sugimoto ◽  
Noriyuki Utagawa ◽  
Kageyoshi Katakura
Keyword(s):  
Sound Source ◽  
Concrete Structures ◽  
Inspection Method ◽  
Ultrasonic Sound ◽  
Acoustic Inspection

THE METHOD OF ACOUSTIC DIRECTION FINDING OF DYNAMIC OBJECTS USING AN UNMANNED AERIAL VEHICLE

2019 ◽  
pp. 14-24
Author(s):  
A. Anisimov ◽  
O. Volkov ◽  
Ya. Linder ◽  
V. Taranukha ◽  
D. Volosheniuk
Keyword(s):  
Sound Source ◽  
High Efficiency ◽  
Signal To Noise Ratio ◽  
Environmental Parameters ◽  
Weather Conditions ◽  
Threshold Value ◽  
Sound Sources ◽  
Worst Case ◽  
Software Complex ◽  
Direction Of Movement

The article describes the method of creation, structure and operation of the method for determining the direction to the sound source. The method relies on a simple mathematical apparatus, which allows it to be implemented on equipment of minimal power, for example, on Arduino microprocessors. The key elements of the method and conditions of use affecting the result are considered. These include the sound parameters of targets, primarily the main frequencies and duration of sound necessary to reliably determine the direction to the sound source. In addition, the method provides means for estimating environmental parameters in order to determine the speed of sound depending on weather conditions, since the results of the method are highly dependent on this parameter. Recommendations have been developed for UAVs on which it will be necessary to install equipment, and the use is described to obtain better results in determining directions to sound sources. Demonstrated proof of the formula that allows one to determine the direction to the sound source, given that the platform where the hardware-software complex will be mounted must move and carry out the determination of the direction to the sound source during movement or, in the worst case, short stops for hovering. For this formula the angle error in degrees is estimated depending on the angle at which the sound wave arrives relatively to direction of movement. Software prototyping was performed for further implementation in the form of a full-fledged software and hardware complex for installation on UAVs. The graphical interface of the software implementation of the method is also presented. The simulation of the system under various circumstances was performed. During the experiments, a threshold value was determined for the key criterion, it is based on the signal-to-noise ratio since the method will not work in a too noisy environment. The experiments performed shown the high efficiency of the method taking into account the features of real sound sources.

Further Comments on Deleterious Behavioral and Physiological Effects of Sound

1975 ◽  
Vol 37 (2) ◽  
pp. 544-546 ◽  
Author(s):  
Barbara J. Morley ◽  
Robert M. Abelson
Keyword(s):  
Genetic Variability ◽  
Sound Source ◽  
Physiological Responses ◽  
Behavioral Responses ◽  
Audiogenic Seizure ◽  
Repeated Exposure ◽  
Physiological Effects ◽  
Seizure Susceptibility ◽  
Ultrasonic Sound

The use of ultrasonic sound as a means of controlling rat populations is questioned. The following points are discussed: (1) the processes of refraction and decreased audiogenic seizure susceptibility with repeated exposure to sound; (2) the genetic variability of the rat with respect to auditory behaviors; (3) the behavioral and physiological responses of organisms other than the rat; and (4) the behavioral responses of rats to ultrasonic sound at distances from the sound source. It is concluded that such a device may be effective under certain circumstances, but more data are needed with respect to the behavioral and physiological effects of ultrasonic sound before it is used for rat control.

Microcalorimeters for X-Ray Spectroscopy

1988 ◽  
Vol 102 ◽  
pp. 41
Author(s):  
E. Silver ◽  
C. Hailey ◽  
S. Labov ◽  
N. Madden ◽  
D. Landis ◽  
...  
Keyword(s):  
High Resolution ◽  
High Efficiency ◽  
Thermal Response ◽  
Low Noise ◽  
High Resolution Spectroscopy ◽  
Superconducting Transition ◽  
Sapphire Substrates ◽  
Laboratory Plasmas ◽  
Adiabatic Demagnetization ◽  
Theoretical Predictions

The merits of microcalorimetry below 1°K for high resolution spectroscopy has become widely recognized on theoretical grounds. By combining the high efficiency, broadband spectral sensitivity of traditional photoelectric detectors with the high resolution capabilities characteristic of dispersive spectrometers, the microcalorimeter could potentially revolutionize spectroscopic measurements of astrophysical and laboratory plasmas. In actuality, however, the performance of prototype instruments has fallen short of theoretical predictions and practical detectors are still unavailable for use as laboratory and space-based instruments. These issues are currently being addressed by the new collaborative initiative between LLNL, LBL, U.C.I., U.C.B., and U.C.D.. Microcalorimeters of various types are being developed and tested at temperatures of 1.4, 0.3, and 0.1°K. These include monolithic devices made from NTD Germanium and composite configurations using sapphire substrates with temperature sensors fabricated from NTD Germanium, evaporative films of Germanium-Gold alloy, or material with superconducting transition edges. A new approache to low noise pulse counting electronics has been developed that allows the ultimate speed of the device to be determined solely by the detector thermal response and geometry. Our laboratory studies of the thermal and resistive properties of these and other candidate materials should enable us to characterize the pulse shape and subsequently predict the ultimate performance. We are building a compact adiabatic demagnetization refrigerator for conveniently reaching 0.1°K in the laboratory and for use in future satellite-borne missions. A description of this instrument together with results from our most recent experiments will be presented.

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