Digital‐Analog Magnetometer Utilizing Superconducting Sensor
Digital‐Analog Magnetometer Utilizing Superconducting Sensor
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DOI：
10.1063/1.1771358
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发表时间：
1967-02
影响因子：
1.6
通讯作者：
R. Forgacs;A. Warnick
中科院分区：
文献类型：
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作者：
R. Forgacs;A. Warnick
研制了一种利用超导量子干涉器件（SQUID）作为传感器的磁强计，并对磁场进行了数字和模拟测量。数字模式允许测量大场变化，恒定精度约为SQUID自然周期的1/10。（自然周期一般为10−6 ~ 10−3 g。）因此，测量大场强变化的精度较高。模拟模式有利于10−8 G量级的高精度测量，但适用于较小的场变化。组合模式测量允许非常高精度的模拟模式与大范围的数字模式相结合。数字模式，代表了对原始锁定磁强计的改进，利用两个同步探测器提供信号，唯一地确定SQUID的瞬时磁偏。同步检测器输出驱动一种新颖的逻辑电路，该电路产生适当的加减脉冲到数字c…
A magnetometer was developed which utilizes a superconducting quantum interference device (SQUID) as a sensor, and permits digital and analog measurements of magnetic fields. The digital mode permits measurement of large field changes with a constant accuracy of approximately 1/10 the natural periodicity of a SQUID. (The natural period is typically 10−6–10−3 G.) Thus, the precision of measurement of large field changes is high. The analog mode is advantageous for high precision measurement, of the order of 10−8 G, but for small field changes. Combined mode measurements permit the very high precision of the analog mode to be combined with the large range of the digital mode. The digital mode, which represents an improvement over the original lock‐on magnetometer, utilizes two synchronous detectors to provide signals which uniquely determine the instantaneous magnetic bias of the SQUID. The synchronous detector outputs drive a novel logic circuit which produces appropriate add‐subtract pulses to a digital c...