Acoustic Output Measurements
Precision Acoustics is pleased to offer access to a full range of acoustic measurement services for medical and non medical ultrasound transducers .
The accurate characterisation of temporal and spatial parameters of a medical ultrasonic field is important for safety reasons. Using our fully automated test tanks, Precision Acoustics can measure the parameters required by international safety standards and regulatory organisations in the frequency range 0.5-20MHz.
Non medical products often require characterisation so that beam profiles and bandwidths can be quantified. Precision Acoustics can undertake measurements according to the relevant international standards to assess the beam profile and calculate the beam width for non-destructive testing transducers.
We also have the capability to characterise the acoustic properties of a wide range of fluids, gels and solid materials in the frequency range 0.5-10MHz.
Measurements can be divided into three categories:
1 Calibrated Point Measurements
Hydrophone measurements of pressure, intensity and associated parameters. For medical transducers, MI (mechanical index), TI (thermal index) and tissue-attenuated pressure/intensity parameters can be calculated. Measurements of transmit and receive voltage responses are often also computed for underwater (sonar) transducers. Materials characterisation measurements are also included in the calibrated point measurement category.
2 Spatial Variation of Field Properties
These measurements are hydrophone-based and involve linear (1-D) and planar (2-D) mapping of pressure fields to a positional accuracy of 5um. This is particularly useful for determining transducer beam widths and radiating areas, but can also be used to determine position of transducer side lobes. Planar scanning can also be used to determine acoustic power when other methods are inappropriate.
3 Whole-field Characterisation
Measurement of total acoustic power, power within an aperture and transducer efficiency can all be made with our Radiation Force Balance. For medical transducers, tissue-attenuated acoustic power can also be calculated.
For full details of our capabilities and charges, please contact David Bell.