Altarawneh M M, Mielke C H, Brooks J S
MPA-NHMFL, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Rev Sci Instrum. 2009 Jun;80(6):066104. doi: 10.1063/1.3152219.
A radio frequency oscillator circuit based on a proximity detector integrated circuit is described as an alternative for the traditional tunnel diode oscillator used for pulsed magnetic field measurements at low temperatures. The proximity detector circuit design, although less sensitive than tunnel diode oscillator circuits, has a number of essential advantages for measurements in the extreme environments of pulsed magnetic fields. These include the insensitivity of operation to voltages induced in the inductor coil, the elimination of a diode bias circuit and tuning, and a broad dynamic range of resonant frequency variation. The circuit has been successfully applied to measure the superconducting upper critical field in Ba(0.55)K(0.45)Fe2As2 single crystals up to 60 T.
一种基于接近探测器集成电路的射频振荡器电路被描述为传统隧道二极管振荡器的替代方案，传统隧道二极管振荡器用于低温下的脉冲磁场测量。接近探测器电路设计虽然不如隧道二极管振荡器电路灵敏，但在脉冲磁场的极端环境中进行测量具有许多重要优势。这些优势包括操作对电感线圈中感应电压不敏感、无需二极管偏置电路和调谐，以及谐振频率变化的宽动态范围。该电路已成功应用于测量高达60 T的Ba(0.55)K(0.45)Fe2As2单晶中的超导上临界场。
