Broadband Vibration Detection in Tissue Phantoms Using a Fiber Fabry–Perot Cavity
Broadband Vibration Detection in Tissue Phantoms Using a Fiber Fabry–Perot Cavity
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DOI：
10.1109/tbme.2017.2731663
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发表时间：
2018-04
影响因子：
4.6
通讯作者：
J. Barnes;Sijia Li;Apoorv Goyal;P. Abolmaesumi;P. Mousavi;Hans-Peter Loock
中科院分区：
文献类型：
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作者：
J. Barnes;Sijia Li;Apoorv Goyal;P. Abolmaesumi;P. Mousavi;Hans-Peter Loock
目的：研制了一种光纤振动传感器，其特征在于具有超宽的动态传感范围，从小于1 Hz到接近6 MHz的临床超声频率。振动传感器由一对匹配的光纤布拉格光栅耦合到定制的信号处理电路。使用Pound-Drever-Hall方案将激光二极管的波长锁定到许多腔谐振中的一个。方法：使用校准的压电振动元件来表征传感器的应变、温度和噪声响应。为了证明其传感能力，构建了具有内置低频振动致动的超声体模。结果如下：光纤传感器被证明可以同时捕获低频振动和临床超声传输波形，具有纳米应变灵敏度。结论：这种小型化和灵敏的振动传感器可以提供有关应变响应和所得超声波波形的全面信息。
Objective: A fiber optic vibration sensor is developed and characterized with an ultrawide dynamic sensing range, from less than 1 Hz to clinical ultrasound frequencies near 6 MHz. The vibration sensor consists of a matched pair of fiber Bragg gratings coupled to a custom-built signal processing circuit. The wavelength of a laser diode is locked to one of the many cavity resonances using the Pound–Drever–Hall scheme. Methods: A calibrated piezoelectric vibration element was used to characterize the sensor's strain, temperature, and noise responses. To demonstrate its sensing capability, an ultrasound phantom with built-in low frequency vibration actuation was constructed. Results: The fiber optic senor was shown to simultaneously capture the low frequency vibration and the clinical ultrasound transmission waveforms with nanostrain sensitivity. Conclusion: This miniaturized and sensitive vibration sensor can provide comprehensive information regarding strain response and the resultant ultrasound waveforms.