Optical‐Fiber Ultrasonic Delay Lines
Optical‐Fiber Ultrasonic Delay Lines
复制标题
光纤超声波延迟线
DOI：
10.1121/1.1909998
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发表时间：
1966
影响因子：
2.4
通讯作者：
I. L. Gelles
中科院分区：
文献类型：
--
作者：
I. L. Gelles
研究了非金属光纤在10 Mc/sec区域的超声脉冲传播特性。发现使用压电换能器可以传播最低阶纵向L（0，1）模式和最低扭转或T（0）模式。L（0，1）模通过单根光纤以及柔性光纤束传播。T（0）模通过单根光纤传播。在直径为75 μ m的熔融石英光纤中，衰减约为0.1dB/μsec，而在相同直径的包层玻璃光纤中，衰减约为0.1dB/μ sec的三倍。在非常短的光纤线路中，观察到许多回波，端面几何形状并不重要。在具有环氧树脂熔融端的柔性纤维束中，由于环氧树脂的高衰减（大于10 dB/mm的涂层长度），没有看到回波。色散在单光纤线路和柔性光纤束中可以忽略不计，但在刚性、完全熔融的光纤束中严重，这些光纤束基本上表现为实心棒。没有...
The ultrasonic pulse‐propagation characteristics of nonmetallic optical fibers were investigated the 10‐Mc/sec region. It was found that the lowest‐order longitudinal L(0,1) mode and the lowest torsional or T(0) mode could be propagated, using piezoelectric transducers. The L(0,1) mode was propagated through single fibers as well as flexible bundles of fibers. The T(0) mode was propagated through single fibers. The attenuation was of the order of 0.1 dB/μsec in fused silica fibers of 75 μ diam, and about three times greater in clad glass fibers of the same diameter. In very‐short‐fiber lines, many echoes were observed and the end‐face geometry was not critical. In flexible‐fiber bundles with epoxy fused ends, no echoes were seen owing to the high attenuation of the epoxy, which was greater than 10 dB/mm of coated length. Dispersion was negligible in the single‐fiber lines and flexible fiber bundles, but severe in rigid, fully fused fiber‐optic bundles that behaved essentially as solid rods. There was no s...