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Wideband Optical Detector of Ultrasound for Medical Imaging Applications
Published on: May 11, 2014
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Precise Observation of Ultrasonic Pulses Using an SPR Sensor
Summary
Surface plasmon resonance (SPR) ultrasonic sensors precisely measure ultrasound pressure waveforms. Optimizing the sensing diameter enhances high-frequency response for applications like photoacoustic microscopy.
Area of Science:
- Photonics and optical sensing
- Acoustic metrology
- Materials science
Background:
- Surface plasmon resonance (SPR) sensors offer localized measurements with a wide, flat frequency response.
- They are suitable for broadband ultrasonic detection in applications like photoacoustic microscopy (PAM).
Purpose of the Study:
- To investigate the precise measurement of ultrasound pressure waveforms using a Kretschmann-type SPR sensor.
- To evaluate the sensor's performance, including noise equivalent pressure and linear dynamic range.
- To analyze the impact of sensing diameter on the SPR sensor's frequency response.
Main Methods:
- Utilized a Kretschmann-type SPR sensor for ultrasound pressure waveform measurement.
- Calibrated the SPR sensor against a standard ultrasonic transducer (UT).
- Systematically varied the sensing diameter to assess its effect on frequency response.
Main Results:
- Achieved a noise equivalent pressure of 52 Pa.
- Demonstrated linear pressure response up to 427 kPa.
- Observed excellent agreement between SPR sensor and UT waveforms in the MHz range.
- Found that reducing the sensing diameter improves high-frequency response.
Conclusions:
- Kretschmann-type SPR sensors are effective for precise ultrasound pressure waveform measurement.
- Careful selection of the sensing diameter is crucial for optimizing SPR sensor performance across different measurement frequencies.
