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首页> 外文期刊>Journal of Low Temperature Physics >Transverse Acoustic Response Measured by AC-cut Quartz Transducer in Superfluid Helium-3
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Transverse Acoustic Response Measured by AC-cut Quartz Transducer in Superfluid Helium-3

机译:交流切割石英换能器在超流氦3中测量的横向声响应

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摘要

The transverse acoustic response in the B phase of superfluid ~(3)He has been measured using an AC-cut quartz transducer at a pressure of 17.0 bar. The measurements were performed by a CW bridge method at a frequency of 9.3 MHz utilizing a quadrature hybrid and a high-frequency lock-in amplifier. By sweeping frequency around the resonance frequency of the transducer, in-phase and quadrature responses of the resonance were obtained from the output of the lock-in amplifier. We successfully separated the quality factor and the resonance frequency. Quality factor of the transducer had a small dip just below T_(c) and increased as (rho)_(n) by cooling, while its resonance frequency decreased sharply at T_(c) and gradually recovered to the normal state value in the low temperature limit.
机译:已经使用交流切割石英换能器在17.0 bar的压力下测量了超流体〜(3)He的B相中的横向声响应。使用正交混合器和高频锁定放大器,以9.3 MHz的频率通过CW电桥方法进行测量。通过在换能器的谐振频率附近扫描频率,可从锁定放大器的输出获得谐振的同相和正交响应。我们成功地分离了品质因数和共振频率。换能器的品质因数在T_(c)附近有一个小倾角,并通过冷却而以(rho)_(n)的形式增加,而其谐振频率在T_(c)处急剧下降,并在较低的温度下逐渐恢复到正常状态值。温度极限。

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