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Temperature‐stabilized wide‐band ultrasonic delay line

机译:温度稳定的宽带超声波延迟线

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The low ultrasonic attenuation of fused quartz in the very high frequency range makes it attractive for an ultrasonic delay line. However, the temperature instability restricts its application. A method of stabilizing the delay time based on the properties of a positive temperature coefficient resistor that is used simultaneously as a temperature sensor and a regulator is discussed. This new type of temperature regulator improves the temperature coefficient of the delay time from 85 ppm/°C to 8 ppm/°C. A temperature‐stabilized wide‐band delay line has been fabricated for high definition television. A wide‐band frequency response is obtained by using LiNbO3 transducers and new type bonding adhesion which is stiffened by irradiation of ultraviolet rays. The design of the delay line, which has a midband frequency of 45 MHz, a band width of 50 MHz, and a delay time of 29.55 ms, is presented and experimental results are also presented.
机译:熔融石英在极高频率范围内的低超声衰减使其对超声延迟线具有吸引力。但是,温度不稳定性限制了其应用。讨论了一种基于同时用作温度传感器和调节器的正温度系数电阻器的特性来稳定延迟时间的方法。这种新型的温度调节器可将延迟时间的温度系数从85 ppm /°C提升至8 ppm /°C。已为高清电视制作了温度稳定的宽带延迟线。通过使用LiNbO3换能器和新型键合粘合力,可以获得宽带频率响应,这种粘合力会因紫外线的照射而增强。提出了延迟线的设计,该延迟线的中带频率为45 MHz,带宽为50 MHz,延迟时间为29.55 ms,并给出了实验结果。

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