Modernized national primary special standard for the unit of acoustic pressure in water media

Isaev, А. Е.; Nekrich, S. F.; Nekrich, G. S.; Sil'vestrov, S. V.; Chernikov, Ivan V.; Shchelkunov, A. I.

doi:10.1007/s11018-010-9528-4

Cited by 2 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These include the method of coupler reciprocity in which three transducers are inserted into a fluid-filled coupler and calibrations are made traceable to electrical standards with a knowledge of the acoustical compliance of the coupler [15,16]. Other methods include the hydrostatic excitation method where the hydrostatic pressure is very slowly varied in a coupler by raising and lowering a secondary chamber [17,18], the vibrating column method and the standing-wave tube [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

A calculable pistonphone for the absolute calibration of hydrophones in the frequency range from 0.5 Hz to 250 Hz

Malcher,

Ford,

Barham

et al. 2024

Metrologia

View full text Add to dashboard Cite

The demand for traceable hydrophone calibrations at low frequencies in support of ocean monitoring applications requires primary standard methods that are able to realise the acoustic pascal. In this paper, a new method for primary calibration of hydrophones is described based on the use of a calculable pistonphone to cover frequencies from 0.5 Hz to 250 Hz. The design consists of a pre-stressed piezoelectric stack driving a piston to create a varying pressure in an air-filled enclosed cavity, the displacement (and so the volume velocity) of the piston being measured by a laser interferometer. The dimensions of the front cavity were designed to allow the calibration of reference hydrophones, but it may also be used to calibrate microphones. Examples of calibration results for several sensors are presented alongside an uncertainty budget for hydrophone calibration with expanded uncertainties ranging from 0.45 dB at 0.5 Hz to 0.30 dB at 20 Hz, and to 0.35 at 250 Hz (expressed for a coverage factor of k=2). The metrological performance is demonstrated by comparisons with results for other calibration methods and an independent implementation of primary calibration methods at other institutes.

show abstract