RF (radio frequency)-SQUID (superconducting quantum interference device) application-based high-stability frequency automatic controller
An automatic controller and frequency control technology, which is applied in the direction of magnetic field measurement, instruments, and the size/direction of the magnetic field by using superconducting devices, can solve the problems of poor long-term frequency stability and poor efficiency, and achieve output frequency stability and application Wide range of environments and high test accuracy
Active Publication Date: 2018-06-15
深圳市君威科技有限公司
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Benefits of technology
This patented technology uses an Automatic Frequence Control (AFC) system that automatically adjusts its frequencies over time without being influenced from outside factors like weather or temperature changes. Its main advantage lies within it's ability for accurate measurements even at very short distances due to its wide range of applications including GIS navigation systems, magnetic field sensors, medical imaging devices, radar equipment, space exploration tools, environmental monitoring stations, military surveillance platforms, security screenings, and other fields where precise measurement needs are necessary.
Problems solved by technology
This patents describes how sensitivity measurements from different types of electronic equipment like magnets or atomic clocks require precise measurement techniques due to their potential impact upon various aspects related industries including defense systems, medical diagnoses, biological researches, environmental monitoring, energy production efficiency improvement, and security measures. However, traditional methods involving inductive coil technology may result in instability over time when exposed outside temperatures change significantly affecting its performance.
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[0037] The deficiencies of existing technology:
[0038] Such as image 3 As shown in (a), the RF-SQUID consists of a superconducting ring LS, which is coupled to the LC resonant circuit through a certain coupling coefficient M.
[0039] In the application process of RF-SQUID, in order to realize the authenticity of the magnetic flux test, in principle, the voltage amplitude VC at both ends of the LC resonant circuit is a one-variable function of the variable of the external magnetic flux, but the current inductance L and capacitance C in the LC resonant circuit are The resonant frequency cannot be accurately designed during the manufacturing process, which causes the voltage amplitude VC at both ends of the LC resonant circuit to be a binary function of the two variables of the external magnetic flux and its own resonant frequency, that is, VC cannot truly reflect the magnitude of the measured magnetic flux , resulting in a test error.
[0040] Since the VC value is very small
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Abstract
The invention discloses an RF (radio frequency)-SQUID (superconducting quantum interference device) application-based high-stability frequency automatic controller. The controller comprises a frequency tracking unit and a phase compensation unit; the frequency tracking unit is electrically connected with the phase compensation unit; the frequency tracking unit is used for capturing and tracking the resonant frequency of an LC circuit in an RF-SQUID application; and the phase compensation unit is used for compensating phase difference caused by different cable lengths in the RF-SQUID application. According to the RF (radio frequency)-SQUID (superconducting quantum interference device) application-based high-stability frequency automatic controller of the invention, automatic frequency control is used to replace conventional open-loop control, and the automatic frequency control has the characteristic of stable output frequency and is not affected by external environments; and the phasecompensation circuit is additionally adopted; and therefore, the high-stability frequency automatic controller has the advantages of wider application environment range and higher test precision. Theadvantages of the high-stability frequency automatic controller can be applied to geomagnetic exploration, physical principle verification, non-destructive detection, and low-frequency telecommunication and other fields.
Description
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