Ultrasound Signal Detection with Multi-bounce Laser Microphone.
Ultrasound Signal Detection with Multi-bounce Laser Microphone.
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DOI：
10.1109/ius46767.2020.9251499
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发表时间：
2020-09
期刊：
影响因子：
--
通讯作者：
Boctor E
中科院分区：
文献类型：
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作者：
Wan Q;Wang C;Xu K;Kang J;Wu Y;Trivedi SB;Gehlbach P;Boctor E
多反弹激光麦克风利用光学方法检测超声信号压力波引起的镀金薄膜膜片的位移。这种灵敏的全光传感技术为先进的超声成像提供了新的机会，因为与传统的超声换能器相比，它有望在更宽的频谱上实现更高的检测信噪比(SNR)。该技术不涉及信号时间平均，检测信噪比的实时增强源于由于膜片的多次反弹而导致的信号强度的放大。该系统以前是为检测爆炸物产生的声学特征而开发的，频率被限制在10千赫以下。为了证明其在生物医学成像应用中的可行性，进行了初步的实验，展示了对频率从100 kHz到超过1 MHz的超声波的高保真检测。实验结果还表明，与商用法布里-珀罗型光学水听器相比，多反弹激光传声器在检测超声信号方面具有更高的检测灵敏度。此外，我们还应用多反弹激光麦克风来检测印度墨水在未进行信号平均的情况下以LED条作为激励源时所发出的光声信号。
The multi-bounce laser microphone utilizes optical methods to detect the displacement of a gold-covered thin film diaphragm caused by ultrasound signal pressure waves. This sensitive all-optical sensing technique provides new opportunities for advanced ultrasound imaging as it is expected to achieve a higher detection signal-to-noise ratio (SNR) in a broader spectrum, as compared to conventional ultrasonic transducers. The technique does not involve signal time-averaging and the real-time enhancement in detection SNR stems from the amplification of signal strength due to multiple bouncing off the diaphragm. The system was previously developed for detecting acoustic signatures generated by explosives and were limited to lower than 10 kHz in frequency. To demonstrate its feasibility for biomedical imaging applications, preliminary experiments were conducted to show high fidelity detection of ultrasound waves with frequencies ranging from 100 kHz to in excess of 1 MHz. Experimental results are also presented in this work demonstrating the improved detection sensitivity of the multi-bounce laser microphone in detecting ultrasound signals when compared with a commercial Fabry-Perot type optical hydrophone. Furthermore, we also applied the multi-bounce laser microphone to detect photoacoustic signatures emitted by India ink when a LED bar is used as the excitation source without signal averaging.