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Development of a Theoretical Model for Membrane Hydrophone Transfer Characteristics

Development of a Theoretical Model for Membrane Hydrophone Transfer Characteristics. Pierre G é lat. 3 April 2003. Background. Bilaminar hydrophones are extensively used to measure and characterise medical ultrasound fields

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Development of a Theoretical Model for Membrane Hydrophone Transfer Characteristics

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  1. Development of a Theoretical Model for Membrane Hydrophone Transfer Characteristics Pierre Gélat 3 April 2003

  2. Background • Bilaminar hydrophones are extensively used to measure and characterise medical ultrasound fields • Developing a hydrophone model would enable users to improve the accuracy of their measurements in the field of medical ultrasound (phase response, deconvolution) • Type of hydrophone initially modelled: 25 m film thickness 0.5 mm diameter bilaminar membrane hydrophones • Need to generalise model to simulate the response of the new generation of Precision Acoustics bilaminar membrane hydrophones (15 m film thickness, 0.4 mm diameter)

  3. A bilaminar membrane hydrophone

  4. Diagram of a bilaminar membrane hydrophone

  5. Hydrophone model assumptions • 25 m pvdf film thickness, 0.5 mm diameter bilaminar • Assume plane wave incidence on hydrophone • Use transfer matrix formulation to evaluate pressure and particle velocities at extremities of pvdf layers • Account for secondary piezoelectric effects • Model pvdf layers as equivalent voltage sources in series with capacitance • Model leg as distributed series resistance shunt capacitance network • Model coaxial cable as transmission line • Account for electrical loading on cable (e.g. oscilloscope, amplifier, arbitrary load)

  6. Bilaminar Hydrophone Equivalent Electrical Circuit

  7. Model input parameters

  8. Open-circuit sensitivity

  9. Predicted phase response

  10. Prediction of pressure waveform

  11. Conclusions • Validation of a model for predicting the transfer characteristics of membrane hydrophones • Can be used to estimate true pressure waveform

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