IEC 62127-1:2022

Overview

IEC 62127-1:2022 - Ultrasonics: Hydrophones - Part 1: Measurement and characterization of medical ultrasonic fields defines standardized methods for using calibrated hydrophones to measure acoustic fields in liquids generated by medical ultrasonic equipment. The standard sets bandwidth and calibration frequency-range requirements based on the spectral content of fields, specifies which acoustic quantities can be measured directly and which are derived, and lays out procedures for correcting hydrophone limitations (finite bandwidth and active element size) and estimating measurement uncertainty.

Key topics and technical requirements

• Hydrophone calibration and sensitivity
  • Requirements for using calibrated hydrophones, including recognition of complex-valued sensitivity (phase and magnitude).
  • Bandwidth and calibration frequency-range criteria tied to field spectral content.
• Primary and derived acoustic parameters
  • Defines a set of primary (measured) acoustic parameters and derived intensity parameters (e.g., pulse-pressure-squared integrals) that may be computed under stated assumptions.
  • Beam characterization parameters such as peak-compressional/peak-rarefactional pressures, spatial-peak RMS pressure, and local distortion parameter.
• Measurement procedures and corrections
  • Procedures for alignment, positioning, water-bath setup, data acquisition and analysis.
  • Waveform deconvolution, modified narrow-band and broadband measurement approaches, and guidance on validation of deconvolution implementations.
  • Spatial averaging correction methods and amended procedures for finite active element size.
• Instrumentation and environment
  • Requirements for hydrophone types, amplifiers, cables, positioning systems, and water-bath preparation (including degassing considerations).
  • Guidance on linearity, directional response, and effective hydrophone radius.
• Uncertainty and conformity
  • Methods for estimating measurement uncertainty and compliance/conformity statements for reporting acoustic output.

Notable technical revisions versus earlier editions:

• Removal of the previous upper frequency limit (40 MHz).
• Hydrophone sensitivity treated as complex-valued.
• Expanded deconvolution and broadband/narrow-band procedures; updated spatial averaging correction and supporting annexes.

Applications and who uses this standard

IEC 62127-1:2022 is essential for:

• Acoustic metrology laboratories performing hydrophone-based measurements.
• Medical ultrasound manufacturers (diagnostic, therapeutic, surgical) validating transducer output.
• Regulatory bodies and test houses assessing device safety and compliance.
• Clinical engineers and research groups characterizing ultrasonic fields for device development and dosimetry studies.

Practical uses include characterizing diagnostic pulses, therapeutic fields, lithotripter outputs, and multi-mode fields where precise pressure and intensity metrics and uncertainty quantification are required.

Related standards

Refer to other parts of the IEC 62127 hydrophone series and relevant IEC medical ultrasound safety and performance standards for broader conformity and device-specific test methods.