Features of the calibration of hydrophones in the nonuniform field of measuring chambers

Golenkov, A. N.; Likhachev, S. M.

doi:10.1007/bf00993618

Cited by 2 publications

(3 citation statements)

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“…The generator is used to provide a signal for the source transducer and the null transducer; it also acts as an amplitude and phase adjuster with the amplitude resolution being 100 µV and the phase resolution 0. Use of this technique at the VNIIFTRI includes a correction for wave distribution in the chamber at higher frequencies [3]. The correction involves adding the following factor to the right-hand side of the expression for the hydrophone sensitivity given by (9.6) in [2]:…”

Section: Calibration By Piezoelectric Compensationmentioning

confidence: 99%

“…where is half of the height of the null transducer, is the radius of the active element of the hydrophone, is the distance from the geometrical centre of the null transducer to the centre of the chamber cavity, is the distance from the geometrical centre of the active element of the hydrophone to the centre of the chamber cavity, is the input capacitance of the electrical load of the hydrophone, is the end-of-cable capacitance of the hydrophone, is the input resistance of the electrical load of the hydrophone, and π is the wave number, where is the frequency, and is the speed of sound in water. This expression was published in part (without the third and fourth factors) in [3].…”

Section: Calibration By Piezoelectric Compensationmentioning

confidence: 99%

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A Russian-Chinese international comparison of hydrophone calibration methods

Enyakov¹,

Likhatchev²,

Платонов³

et al. 1999

Metrologia

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This is the final report of a Russian-Chinese international comparison of hydrophone calibration methods conducted by exchanging hydrophones between the Hangzhou Applied Acoustics Research Institute (HAARI) and the All-Russian Scientific and Research Institute for Physical-technical and Radio-technical Measurements (VNIIFTRI). The comparison was organized in 1997/98 in order to assess the current state of the art for hydrophone calibration in the Russian Federation and China. Six hydrophones of different types were calibrated using the Russian and Chinese Underwater Pressure National Standards in the frequency range 1 Hz to 630 kHz. The following methods and facilities for hydrophone calibration were used during the comparison: piezoelectric compensation in a closed chamber, vibrating column in an open chamber, and free-field reciprocity in the laboratory tanks. Some features and nuances of these facilities are considered. The agreement of 140 calibration data was checked for six hydrophones. The mean and maximum differences between the participants' results were 0.24 dB and 1.6 dB, respectively.

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Section: Calibration By Piezoelectric Compensationmentioning

confidence: 99%

Section: Calibration By Piezoelectric Compensationmentioning

confidence: 99%

A Russian-Chinese international comparison of hydrophone calibration methods

Enyakov¹,

Likhatchev²,

Платонов³

et al. 1999

Metrologia

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show abstract

“…5 In the piezoelectric compensation method, the hydrophone is calibrated in an enclosed small water-filled chamber. This method, which works only for frequencies with a wavelength sufficiently larger than the largest dimension of the chamber, 3 is useful for calibration in the 1 Hz to 5 kHz frequency range. For our required frequencies, more than one chamber is required in order to cover the full frequency range.…”

Section: Introductionmentioning

confidence: 99%

Design Considerations and Establishment of a Low Frequency Hydrophone Calibration Setup using the Principle of Vibrating Water Column

Malarkodi¹,

Latha²,

Sridhar³

et al. 2018

IJAV

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This paper describes the design and implementation of a low frequency hydrophone calibration system, using a vibrating water column. The hydrophone to be calibrated is immersed in the water column and the position of the transducer is kept constant while a hydrodynamic pressure field is generated in the water column by means of a shaker (similar to what is described in IEC 60565). F. Schloss et al. used a vibrating water column for hydrophone calibration in the frequency range from 10 Hz to 700 Hz. 1 An interlaboratory comparison calibration was carried out by the Russian Metrological Institute of Technical Physics and Radio Engineering (VNIIFTRI) and Hangzhou Applied Acoustics Research Institute (HAARI) in the frequency range from 250 Hz to 1 kHz. 2 The dimensions of the test vessel are important for deciding the frequency range of operation. Simulations were carried out for the selection of vessel material and dimension. To overcome limitations in the frequency range caused by resonance in the water column, the principle of operation was modified from absolute calibration to calibration by comparison. By using a single cylindrical vessel, the frequency range is extended to cover frequencies from less than 100 Hz to 1 kHz. The calibrated reference hydrophone type Bruel & Kjaer (B&K) 8104 is used in this calibration. Some results obtained from the use of the calibration system are also presented in this paper.

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Features of the calibration of hydrophones in the nonuniform field of measuring chambers

Cited by 2 publications

References 0 publications

A Russian-Chinese international comparison of hydrophone calibration methods

A Russian-Chinese international comparison of hydrophone calibration methods

Design Considerations and Establishment of a Low Frequency Hydrophone Calibration Setup using the Principle of Vibrating Water Column

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