PD IEC/TS 62903:2018

What is PD IEC/TS 62903- Spherically curved transducers about? 

PD IEC/TS 62903 is a safety standard on ultrasonics. 

PD IEC/TS 62903, which is a Technical Specification: 

• Establishes the free-field convergent spherical wave self-reciprocity method for ultrasonic transducer calibration 
• Establishes the measurement conditions and experimental procedure required to determine the transducer's electroacoustic parameters and acoustic output power using the self-reciprocity method 
• Establishes the criteria for checking the reciprocity of these transducers and the linear range of the focused field 
• Provides guiding information for the assessment of the overall measurement uncertainties for radiation conductance 

PD IEC/TS 62903 is applicable to: 

• Circular spherically curved concave focusing transducers without a centric hole working in the linear amplitude range 
• Measurements in the frequency range 0,5 MHz to 15 MHz 
• Acoustic pressure amplitudes in the focused field within the linear amplitude range 

Note: The electroacoustical characterization and measurement methods applied for spherically curved transducers have not been defined in standard documents for either terms or protocols. 

Who is PD IEC/TS 62903- Spherically curved transducers for?  

PD IEC/TS 62903 on measuring the electroacoustical parameters and acoustic output power of spherically curved transducers using the self-reciprocity method is relevant to: 

• Manufacturers of spherically curved auxiliary transducers 
• Manufacturers of miniature hydrophone 
• Manufacturers of ultrasonic transducers 
• Testing authorities of electroacoustic methods 
• Designers and manufacturers of electrical systems 
• Acousticians 

Why should you use PD IEC/TS 62903- Spherically curved transducers? 

An ultrasonic transducer is an important acoustic device that can act as a transmitter or a receiver in the applications of medical ultrasound, non-destructive testing, and ultrasonic materials processing.  

The performance of a transducer is a decisive factor that governs the device's range of applicability, efficiency, and quality control in manufacturing. The mechanisms, transmitting fields, performances, and measurement methods used for these transducers have been studied over the past few decades. PD IEC/TS 62903 defines the relevant electroacoustical parameters for these devices and establishes the self-reciprocity measurement method for spherically curved concave focusing transducers. The focused field performance parameters include the effective half-aperture (the effective radius), the beam width, the effective area, the geometric focal length, and the focus half-angle for spherically curved transducers. The transmission performance parameters include the radiation conductance, the acoustic output power, the free field transmitting a response to current (voltage), the electroacoustic efficiency, and the electric impedance. 

Overall, PD IEC/TS 62903 is useful as it assists the user with the transducer calibration method based on the reciprocity principle that uses the received echo signal from the plane reflector that is set perpendicular to the incident beam axis of the transducer.