研究目的
To study the transformation mechanism between acoustic and pyroelectric signals in PVDF pyroelectric sensors for ultrasonic power measurement.
研究成果
The physical model is effective for analyzing pyroelectric characteristics and simulating output signals. The PVDF sensor responds quickly to ultrasound, with signal amplitude proportional to acoustic power, making it suitable for rapid ultrasonic power measurements after optimization and calibration.
研究不足
The model assumes adiabatic conditions and 100% conversion efficiency, which may not hold in real environments due to thermal dispersion and sound wave reflections. Differences in simulation and experimental amplitudes indicate potential inaccuracies from convection and other confounding phenomena.
1：Experimental Design and Method Selection:
A physical model was built for theoretical study using finite-element analysis to simulate ultrasound propagation and temperature rise. An experimental setup was designed to fabricate and test a PVDF pyroelectric sensor.
2：Sample Selection and Data Sources:
A PVDF film with silver electrodes and a composite backing material from the National Physical Laboratory, UK, were used. Data were acquired from simulations and experimental measurements.
3：List of Experimental Equipment and Materials:
PVDF film (52 μm thickness), backing material (polyurethane rubber with micro-balloons), function generator (RIGOL DG1022U), power amplifier (JYH-1000), analog low-pass filter, computer for data acquisition.
4：Experimental Procedures and Operational Workflow:
The sensor was fabricated with PVDF and backing material, housed in a steel case. Ultrasound was generated by a focusing transducer, and pyroelectric signals were measured with a low-pass filter and data acquisition system. Different radiation times were tested.
5：Data Analysis Methods:
Simulation results from finite-element analysis were compared with experimental data to analyze acoustic field, temperature distribution, and pyroelectric signal characteristics.
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