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    • 3. 发明授权
    • Liquid level indicator for an extremely low temperature-liquefied gas
employing a superconductor wire
    • 采用超导线的极低温液化气体液位指示器
    • US4118984A
    • 1978-10-10
    • US828678
    • 1977-08-29
    • Yasuo KuraokaAstushi KurosawaTetsuo ShiraiKatsuro Saito
    • Yasuo KuraokaAstushi KurosawaTetsuo ShiraiKatsuro Saito
    • G01F23/24
    • G01F23/246Y10S505/842
    • In a liquid level indicator for an extremely low temperature-liquefied gas wherein a current is caused to flow through a superconductor wire immersed in the extremely low temperature-liquefied gas, a voltage across terminals of the superconductor wire is measured, and the liquid level of the liquefied gas lying between the terminals is gauged on the basis of the measured value, the improvement therein comprising the providing of a current supply portion which, at first, increases the current to be fed to the superconductor wire up to the so-called plateau region in a current - voltage hysteresis curve of the superconductor wire, and thereafter, decreases it down to a return-path rectilinear region in the curve departing from the plateau region, the liquid level being gauged on the basis of the measured value of the terminal voltage of the superconductor wire as obtained by the use of the decreased current. The improved liquid level indicator is capable of measuring the liquid levels of, for example, helium over from the normal-pressure state to the superfluid state.
    • 在用于极低温度液化气体的液面指示器中,其中使电流流过浸在极低温液化气体中的超导体线,测量超导线端子间的电压, 位于端子之间的液化气体基于测量值进行测量,其改进在于包括提供电流供应部分,其首先将提供给超导体导线的电流增加到所谓的平台 在超导线的电流 - 电压滞后曲线中的区域,然后将其降低到离开平台区域的曲线中的返回路径直线区域,基于终端的测量值来测量液位 通过使用减小的电流获得的超导体线的电压。 改进的液面指示器能够测量例如从正常压力状态到超流体状态的氦气的液面。