DIN EN IEC 62127-1:2025-02

This part of IEC 62127 specifies parameters that can be used to calibrate ultrasonic fields propagating in liquids, particularly water, using hydrophones. These also include bandwidth criteria and requirements for the frequency range depending on the spectral range of the fields to be characterized. In addition, methods for determining these parameters are described. This document: - defines a group of acoustic parameters that can be measured on a physically sound basis; - defines a second group of parameters that can be derived under certain assumptions from these measurements, and called derived intensity parameters; - defines a measurement procedure that can be used for the determination of acoustic pressure parameters; - defines the conditions under which the measurements of acoustic parameters can be made using calibrated hydrophones. The hydrophone as defined can be of a piezoelectric or an optic type. The standard differs from DIN EN 62127-1:2013-11 as follows: a) the upper frequency limit of 40 MHz has been deleted; b) the hydrophone sensitivity definitions have been changed so that the sensitivities are recognized as complex values; c) the procedures and requirements for narrowband approximation and broadband measurements have been changed; details regarding waveform collapse have been added; d) the procedures for corrections regarding spatial averaging have been changed; e) Annex D, Annex E, and the bibliography have been updated to support the changes to the normative parts. Typical examples of applications include all applications of medical ultrasound equipment. Specific device-related measurement standards, for example IEC 61689, IEC 61157, IEC 61847, or IEC 62359, may refer to this standard for suitable acoustic parameters.