Hydrophone calibration system

Abstract

A system to calibrate underwater electro-acoustic hydrophones by primary method, namely, Reciprocity method, in wide frequency range from few kilohertz to megahertz is presented. The aim is to realize primary level “Hydrophone Calibration System” covering from few kilohertz to upper limit of underwater applications with very limited restrictions in one simple system. This system not only covers wide frequency range of underwater applications but also offers low-cost solution to reach enough uncertainty level required for primary calibration according to standards [1]-[3]. The system is based on very high resolution PC oscilloscope of Pico Technology, namely, PicoScope 4262, used for primary data acquizition and digitizing. Primary signal generator and power amplifier, available in market, are integrated into system for purpose. The detailed description is presented and uncertainty budget is discussed.

Application of 2E-2U method for free-field underwater calibrations of hydrophones and projectors in a reverberant laboratory test tank

“…In figure 6(a), the calibration results of the 8104 hydrophone are compared between the comparison measurements in the test tank and the pressure chamber [16]. The plot shows the sensitivity levels of the hydrophone obtained from the 2E-2U constructed signals of the measurements in the test tank (circles) and the pressure calibration method in the pressure chamber (squares).…”