IEEE Trans Biomed Eng. 2018 Apr;65(4):921-927. doi: 10.1109/TBME.2017.2731663. Epub 2017 Jul 24.
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.
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.
The fiber optic senor was shown to simultaneously capture the low frequency vibration and the clinical ultrasound transmission waveforms with nanostrain sensitivity.
This miniaturized and sensitive vibration sensor can provide comprehensive information regarding strain response and the resultant ultrasound waveforms.
开发了一种光纤振动传感器，其具有超宽的动态传感范围，从小于 1 Hz 到近 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组成，与定制的信号处理电路耦合。使用 Pound-Drever-Hall 方案将激光二极管的波长锁定到多个腔共振之一。
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。为了演示其传感能力，构建了一个带有内置低频振动激励的超声体模。
光纤传感器显示出具有纳应变灵敏度的低频振动和临床超声传输波形的同时捕获能力。
这种小型化和敏感的振动传感器可以提供关于应变响应和由此产生的超声波形的综合信息。
