超声波 使用自互易法测量球面弯曲换能器的电声参数和声输出功率

[中文适用范围]： 本文件是一项技术规范， a) 建立了用于超声换能器校准的自由场收敛球面波自互易方法， b) 建立了使用自互易方法确定换能器的电声参数和声输出功率所需的测量条件和实验程序， c) 建立了检查这些换能器的互易性和聚焦场的线性范围的标准，以及 d) 提供了评估辐射电导整体测量不确定度的指导信息。 本文件适用于： i) 工作在线性振幅范围内的无中心孔的圆形球面凹聚焦换能器， ii) 频率范围0.5 MHz至15 MHz的测量，以及 iii) 聚焦场中线性振幅范围内的声压振幅。 水听器使用互易方法的表征和灵敏度校准不在本文件范围内，但在IEC 62127-2和IEC 60565-1中有所涵盖。 [外文原描述]： IEC TS 62903:2023 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC TS 62903:2023: a ) establishes the free-field convergent spherical wave self-reciprocity method for ultrasonic transducer calibration, b) establishes the measurement conditions and experimental procedure required to determine the transducer's electroacoustic parameters and acoustic output power using the self-reciprocity method, c) establishes the criteria for checking the reciprocity of these transducers and the linear range of the focused field, and d) provides guiding information for the assessment of the overall measurement uncertainties for radiation conductance. This document is applicable to: 1) circular spherically curved concave focusing transducers without a centric hole working in the linear amplitude range, 2) measurements in the frequency range 0,5 MHz to 15 MHz, and 3) acoustic pressure amplitudes in the focused field within the linear amplitude range. Characterization and sensitivity calibration of hydrophones using the reciprocity method are not addressed in this document but covered in IEC 62127-2 and IEC 60565-1. IEC TS 62903:2023 cancels and replaces the first edition published in 2018. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Several quantities are recognized as complex-valued quantities in the definitions and in the main text. b) Annex I was added to provide typical measurement ranges and to provide example calibration results.