Basic Researches on Ultrasound Transmission Fibers and its Applications to Medical Transducers and so on.

该负责人和其他研究人员已经进行了超声波传播试验，并对其工程应用进行了研究。研究了两种类型的传输光纤：一种是用于实际通信系统的光纤，另一种是实际用作航空材料等的碳纤维。在研究之初，我们研究了使用普通光纤的超声波传输光纤，但它存在着没有涂层覆盖就容易断裂，很难与压电换能器粘接的缺点。另一方面，碳纤维由于其固有的高柔韧性和紧密性，表现出很难断裂的优点，而且由于它可以形成带状结构，因此很容易粘结到压电陶瓷减震器上。事实证明，碳纤维的这种优越特性可以使超声波在纤维中得到良好的传输。作为这种超声波传输光纤的应用，研究人员处理的是电子传感器，如超声波光纤陀螺仪、定位传感器和热传感器等，这些都是现在的基础，但它们的特性还不够。然而，今后的进一步研究肯定会改善这些特点。使用碳纤维的超声传输纤维系统在医用换能器中的应用仍是未来的问题。

The head and other investigators have performed the ultrsound transmission fivers and studied its engineering applications. Two types of transmission fibers were studied : one was composed of optical fiber applied to the practical communicationsystems and the other was of carbon fiber which was practically used as air-craft material etc. At the beginning of the research, the ultrasound transmission fiber using usual optical fiber was investigated ; however it had such weak points that it was apt to be broken without coating cover and bonding of it to piezoceramic transducers was not easy. On the other hand, the carbon fiber showed such merits that it could hardly be broken due to its inherint characteristics of high flexibility and tightness, and moreover it could easily be bonded to the piezo-ceramic tarnsducer because it could be constructed as a belt form. It has been proved that such superior characteristics of carbon fiber could persuaded good transmission of ultrasound through the fiber. As applications of such ultrasound transmission fibers, the investigators dealt with electronic sensors ; for example, ultrasonic fiber gyroscope, positioning sensor and thermal sensor etc.These were fundamentals now and their characteristics were not enough yet. However further invesigation in future can surely improve the characteristics. Applications of the ultrasound transmission fiber system using carbon fiber to composition of a medical trasnducer remained as the future problems.