A Digital Simulator of Superconducting Quantum Interferometer

Abstract

The invention relates to a digitalized simulator for an SQUID. The digitalized simulator for the SQUID is characterized in that electrical characteristic simulation of the SQUID is achieved at normal temperature through digital circuits of an ADC (Analog-to-Digital Converter), a microprocessor and a DAC (Digital-to-Analog Converter); an embedded system architecture is utilized in the simulator, magnetic flux conversion is performed on feedback signals of a reading circuit according to an on-line updating SQUID characteristic parameter library established inside a micro-controller through an analog-digital conversion mode, finally feedback output is performed according to a mathematical model created on the basis of an SQUID-phi characteristic curve, and accordingly hardware-in-loop simulation in a flux locked loop reading circuit of SQUIDs of different characteristics can be achieved on the same platform. The integrated level, the flexibility, the universality and the measurement range of the digitalized simulator for the SQUID are improved greatly, and the testing of the reading circuit of the SQUID can be simplified effectively.

Description

technical field [0001] The invention relates to a simulator of a superconducting quantum interferometer, in particular to a simulation of the electrical characteristics of a superconducting quantum interferometer through a digital circuit, and by modifying the relevant parameters of the simulator through a serial port, different superconducting quantum interferometer hardware can be completed. A device for ring simulation. It belongs to the technical field of superconducting applications. Background technique [0002] Superconducting quantum interferometer (SQUID: SuperconductingQUantumInterferenceDevice) is currently known as the most sensitive magnetic sensor. It has many applications in the fields of biomagnetism, geophysics and low-field nuclear magnetic resonance. It is mainly used for the detection of extremely weak magnetic fields. During the development and testing of the low-temperature DCSQUID readout circuit, SQUID itself has problems such as long preparation tim...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the existing SQUID simulator parameter adjustment is cumbersome and requires the cooperation of external signal generators, etc., the purpose of the present invention is to provide a superconducting quantum interferometer simulator realized by digital circuits, modify the simulator through the serial port The relevant parameters can complete the hardware-in-the-loop simulation of different superconducting quantum interferometers. The device not only has high integration and flexibility, but also can be read out in two different flux-locked loops of the flux modulation type and the direct-reading type through software. Realize multiple Φ in strict accordance with the V-Ф characteristic of SQUID in the circuit 0 Simulation of Flux Variations

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