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In mathematics and physics, a scalar field associates a scalar value to every point in a space – possibly physical space. The scalar may either be a (dimensionless) mathematical number or a physical quantity. In a physical context, scalar fields are required to be independent of the choice of reference frame, meaning that any two observers using the same units will agree on the value of the scalar field at the same absolute point in space (or spacetime) regardless of their respective points of origin. Examples used in physics include the temperature distribution throughout space, the pressure distribution in a fluid, and spin-zero quantum fields, such as the Higgs field. These fields are the subject of scalar field theory.
A scalar in-situ calibration method for a three-axis magnetic field reference source in a magnetic shielded environment
PendingCN122260203AStable magnetic field referenceReliable magnetic field referenceElectrical measurementsComplex mathematical operationsMagnetic measurementsScalar field
The application relates to a scalar in-situ calibration method for a three-axis magnetic field reference source in a magnetic shielding environment, and relates to the fields of weak magnetic measurement and quantum precision measurement. In order to solve the problem that the prior art cannot execute in-situ calibration in a closed environment without complex alignment, the application takes the magnetic field modulus data obtained by a scalar magnetometer as the only input, constructs a global error model, and quantifies the mapping relationship between the coil input current and the actual output magnetic field; taking the minimum residual error between the scalar field measurement value and the model calculation value as the optimization target, the LM algorithm is used to inversely solve the coil actual response matrix and the environmental background magnetic field, and the global compensation of the system error is completed; meanwhile, the magnetic coupling distortion effect of the magnetic shielding boundary is calculated by using the mirror method, the coil geometric size is optimized, the magnetic field uniformity and the boundary magnetization effect suppression are balanced from the design source, and finally the accurate mapping model of the input current and the actual output magnetic field is established. The application calibrates the three-axis coil with high precision.
Owner:HARBIN INST OF TECH