研究目的
To demonstrate a MEMS enabled photoacoustic system for improved specificity and resolution in biomedical imaging and non-destructive testing applications.
研究成果
PMUT arrays can be effectively used with a MEMS Q-switched Nd:YAG laser for scanning targets in clear and turbid media, indicating potential for high-quality imaging in biomedical and non-destructive testing applications.
研究不足
Variations in transducer production process affect performance; higher pulse energies required for certain scans may induce unwanted vibrational modes.
1：Experimental Design and Method Selection:
Utilizes a custom MEMS Q-switched Nd:YAG laser for PA wave generation and custom-built MEMS thin-film aluminium nitride PMUT arrays for detection.
2：Sample Selection and Data Sources:
Targets include polyimide coated optical fibres and ink-soaked suture threads embedded in gelatine phantoms.
3：List of Experimental Equipment and Materials:
MEMS Q-switched Nd:YAG laser, PMUT arrays, gelatine phantoms, high-speed DAQ card, voltage amplifier.
4：Experimental Procedures and Operational Workflow:
Laser output is focussed onto targets, PA waves detected by PMUT arrays, signals amplified and recorded.
5：Data Analysis Methods:
Power spectral density calculated using a Hamming window, signal power integrated over PMUT array's bandwidth.
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