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Method and Apparatus for Evaluating Superconducting Tunnel Junction Detector Noise Versus Bias Voltage
Method and Apparatus for Evaluating Superconducting Tunnel Junction Detector Noise Versus Bias Voltage
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机译:评估超导隧道结检测器噪声与偏置电压的方法和装置
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摘要
A technique for characterizing the noise behavior of a superconducting tunnel junction (STJ) detector as a function of its applied bias voltage Vb by stepping the STJ's bias voltage across a predetermined range and, at each applied bias, making multiple measurements of the detector's current, calculating their mean and their standard deviation from their mean, and using this standard deviation as a measure of the STJ detector's noise at that applied bias. Because the method is readily executed under computer control, it is particularly useful when large numbers of STJ detectors require biasing, as in STJ detector arrays In a preferred implementation, the STJ is measured under computer control by attaching it to a digital spectrometer comprising a digital x-ray processor (DXP) coupled to a preamplifier that can set the STJ's bias voltage Vb using a digital-to-analog converter (DAC) controlled by the DXP.
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机译:一种通过将STJ的偏置电压跨过预定范围并在每个施加的偏置下将超导隧道结(STJ)检测器的噪声行为表征为其施加的偏置电压V b Sub>的函数的技术对检测器电流进行多次测量,计算其均值和与均值的标准偏差,并使用此标准偏差作为STJ检测器在所施加偏置下的噪声的量度。因为该方法很容易在计算机控制下执行,所以当大量STJ检测器需要偏置时尤其有用,例如在STJ检测器阵列中。在一个优选的实现中,通过在计算机控制下将STJ附加到包含数字信号的数字光谱仪上来测量STJ。 X射线处理器(DXP)耦合到前置放大器,该前置放大器可以使用DXP控制的数模转换器(DAC)来设置STJ的偏置电压V b Sub>。
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