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AssigneeAerospace Information Research Institute, Chinese Academy of Sciences
InventorsJiankai LI, Guangyou FANG, Ling HUANG, Lihua LI, Xiaojun LIU, Jiangjie HUANG
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Conventional calibration fixtures, such as Helmholtz coils and magnetically shielded rooms, are incapable of accommodating large-scale magnetic sensors with coil diameters of 2 meters or more, preventing accurate quantification of their operational bandwidth and noise level. The present invention provides a method and system for performing such calibration in an open, field environment, overcoming these physical constraints. The method involves deploying a large-scale calibration coil on the ground. To calibrate the operational bandwidth, a reference magnetic sensor with a known conversion coefficient and the large-scale sensor under test are simultaneously exposed to a magnetic field generated by the calibration coil. Their output signals are synchronously acquired via a multi-channel receiver and compared to determine the conversion coefficient of the sensor under test. To determine the intrinsic noise level, the large-scale sensor under test and a second sensor of the same type are simultaneously exposed to the generated magnetic field. A correlation analysis is performed on their synchronously acquired output signals to to determine a noise level of the magnetic sensor under test. This invention enables high-precision, quantitative calibration of oversized magnetic sensors, which is critical for applications such as airborne electromagnetic detection systems.
A method for calibrating an operational bandwidth and a noise level of a large-scale magnetic sensor, the method comprising:
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A device for calibrating an operational bandwidth and a noise level of a large-scale magnetic sensor, the device comprising:
Dependencies are inferred from the claim text.