Broadband hydrophone calibration below 1 MHz
نویسندگان
چکیده
منابع مشابه
Development of calibration techniques for ultrasonic hydrophone probes in the frequency range from 1 to 100 MHz.
The primary objective of this work was to develop and optimize the calibration techniques for ultrasonic hydrophone probes used in acoustic field measurements up to 100 MHz. A dependable, 100 MHz calibration method was necessary to examine the behavior of a sub-millimeter spatial resolution fiber optic (FO) sensor and assess the need for such a sensor as an alternative tool for high frequency c...
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A two-pronged approach, review and measurement, has been adopted to characterize the conductivity of tissues at frequencies below 1 MHz. The review covers data published in the last decade and earlier data not included in recent reviews. The measurements were carried out on pig tissue, in vivo, and pig body fluids in vitro. Conductivity data have been obtained for skeletal and myocardial muscle...
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A method is described for comparing the sensitivity of two hydrophones over the frequency range 1-15 MHz. This technique forms the basis for the dissemination of national ultrasonic standards in the U.K. over this frequency range. A reference hydrophone is placed in an ultrasonic field and then the device being calibrated is substituted and the two output voltages are compared. This substitutio...
متن کاملPhase calibration of hydrophones: heterodyne time-delay spectrometry and broadband pulse technique using an optical reference hydrophone
Two hydrophone calibration techniques are presented which provide amplitude and phase of hydrophone sensitivity. Heterodyne time-delay spectrometry can be applied in the frequency range from 0.5 to 50 MHz to all common hydrophones but needs a standard to obtain absolute values. A pulse technique between 1 and 70 MHz allows exploiting of an optical multilayer hydrophone as a phase standard. In c...
متن کاملAbsolute Hydrophone Calibration to 40MHz Using Ultrasonic Far-Field
An absolute hydrophone calibration technique using ultrasonic far-field with optical interferometry was extended to 40MHz to evaluate the sound pressure amplitude generated by medical ultrasound equipment. A 1-mm nominal radius plane transducer was the calibration sound source for an ultrasonic far-field at 50mm propagation distance at 40MHz. The transducer’s effective radius was 0.88mm at 40MH...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1995
ISSN: 0001-4966
DOI: 10.1121/1.411513