Working point jump control method and system of wide-range SQUID magnetic sensor

A technology of a magnetic sensor and a control method, which is applied in the field of operating point jump control of a large-range SQUID magnetic sensor, can solve problems such as overshoot, oscillation, and inaccurate jump counting, and achieve elimination of miscounting, high reliability, and elimination of Effects of transient phenomena of overshoot and oscillation

Active Publication Date: 2016-01-27
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0009] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method and system for controlling the jumping of the working point of a large-range SQUID magnetic

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  • Working point jump control method and system of wide-range SQUID magnetic sensor
  • Working point jump control method and system of wide-range SQUID magnetic sensor
  • Working point jump control method and system of wide-range SQUID magnetic sensor

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Embodiment 1

[0043] This embodiment provides a method for controlling the operating point jump of a large-range SQUID magnetic sensor, such as Figure 6 As shown, the operating point jump control method of the large-range SQUID magnetic sensor includes:

[0044] S1, when the output voltage range of the FLL of the large-range SQUID magnetic sensor reaches the upper limit voltage range, output a control signal to the reset control terminal of the FLL, so that the FLL starts to reset; the upper limit voltage range is the upper limit voltage range of the FLL Feedback flux reaches Φ 0 The magnitude of the output voltage of the FLL corresponding to the integer multiple of . The outputting a control signal to control the FLL to start reset is to use the control signal to control the reset control terminal of the FLL, so that the output voltage of the FLL starts to return to zero. Specifically, the upper limit voltage includes +V H and -V H , the upper limit voltage amplitude is V H ; when th...

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Abstract

The invention provides a working point jump control method and system of a wide-range SQUID magnetic sensor. The method comprises, when an output voltage amplitude of the FLL of the wide-range SQUID magnetic sensor reaches an upper-limit voltage amplitude, outputting a control signal to a reset control end of an FLL so that the FLL starts to reset, and, when the output voltage amplitude of the FLL of the wide-range SQUID magnetic sensor reaches a lower-limit voltage amplitude, releasing the control signal so that the FLL naturally enters a locked state. Through two threshold voltage judgment and state control methods, optimal reset control is achieved, accurate switching of working points is ensured, a reset failure is prevented from generating a miscount, reset and relocking processes are also optimized, the shortest time of a switching process is achieved, and the overshoot transient problem generated in traditional reset zero crossing and re-locking processes are prevented.

Description

technical field [0001] The invention belongs to the technical field of semiconductors, and relates to a control method of a SQUID magnetic sensor, in particular to a method and system for controlling the jump of a working point of a large-range SQUID magnetic sensor. Background technique [0002] A sensor using a superconducting quantum interference device (Superconducting Quantum Interference Device, hereinafter referred to as SQUID) is the most sensitive magnetic sensor known at present. It is widely used in the detection and scientific research of extremely weak magnetic signals such as heart magnetism, brain magnetism, and extremely low-field nuclear magnetic resonance. Due to its use of microelectronic technology, it plays an irreplaceable role in multi-channel, high-resolution, integrated high-end application systems. [0003] SQUID is a superconducting ring composed of two superconducting Josephson junctions connected in parallel, leading out the two ends of the junc...

Claims

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Application Information

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IPC IPC(8): G05B19/042G01R35/00
Inventor 王永良荣亮亮徐小峰孔祥燕谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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