Fiber optic ultrasonic sensor using Raman-Nath light diffraction
Fiber optic ultrasonic sensor using Raman-Nath light diffraction
复制标题
使用拉曼-纳斯光衍射的光纤超声波传感器
DOI：
10.1109/58.279129
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
D. Koller
中科院分区：
文献类型：
--
作者：
Yunqiu Wu;P. Shankar;P. Lewin;D. Koller
利用拉曼-纳特光衍射原理，研制了一种新型光纤超声传感器。该传感器不会干扰声场，并表现出宽带频率响应。除了场的遥测外，它还适用于连续和脉冲超声波的测量。将该传感器的实验结果与校准后的PVDF针式水听器的测量结果进行了比较，显示出很好的一致性。该传感器的频率响应范围为3~15 MHz，这是医学超声成像中使用的典型频率响应，使用时间延迟光谱(TDS)技术进行了测量。在声场和传感器之间不存在任何扰动的特定应用中，光纤传感器似乎为广泛使用的PVDF超声探头提供了一种有用的替代方案。此外，由于传感器的有源元件直径可与光纤的芯径相媲美，因此光纤传感器将空间平均效应降至最低，并与目前最先进的水听器相比有显著改进，目前水听器的最小直径约为300微米/米。
A novel fiber optic ultrasonic sensor using the principle of Raman-Nath light diffraction has been developed. The sensor does not perturb the acoustic field and exhibits a wideband frequency response. In addition to the remote sensing of the field, it is suitable for measurements of both continuous and pulsed ultrasonic waves. The experimental results obtained with the sensor were compared to those measured using a calibrated PVDF needle hydrophone, showing excellent agreement. The sensor's frequency response in the range from 3 to 15 MHz, typical of that used in medical ultrasound imaging, was determined using the time delay spectrometry (TDS) technique. It appears that the fiber optic sensor provides a useful alternative to the widely used PVDF ultrasonic probes in specific applications where any perturbation between acoustic field and sensor is undesirable. Also, since the active element diameter of the sensor can be made comparable to the core diameter of an optical fiber, the fiber optic sensor minimizes the spatial averaging effects and offers significant improvement in comparison with the present state-of-the-art hydrophones which have a minimum diameter on the order of 300 /spl mu/m.<<ETX>>