Abstract
The induction magnetometers are widely applied for magnetotelluric detection due to the characteristics of wide frequency band, large detection depth range and small size. However, the key part of the induction magnetometers – the magnetic core has eddy current loss and hysteresis loss, which significantly affects the sensitivity of the induction magnetometers. In order to improve the sensitivity of the induction magnetometers at high frequencies, this paper investigates various parameters related to the performance of the induction magnetometers working at 10 kHz to 100 kHz. Moreover, optimization method is proposed to realize the development of a wide-band, high-sensitivity, and low-noise induction magnetometer. First of all, the parameters related to the sensitivity of the sensor are investigated according to the law of electromagnetic induction. A three-dimensional finite element (3D-FE) simulation model was established to study the influence of various parameters of induction magnetometers. In addition, an analysis method combining orthogonal experiment and response surface method is adopted to reduce the quantity of computations and improve the efficiency of analysis. The orthogonal experiment is able to obtain preliminary optimal parameters with only a small amount of computation results. Based on the results of the orthogonal experiment, the response surface method is used to illustrate the relationship between the sensor parameters and losses, and hence the optimal sensor parameters can be obtained. Finally, the model is verified by other sets of simulations, and the results show the regression coefficient of the model <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$R^{2}=0.9735$ </tex-math></inline-formula> , indicating the effectiveness of the proposed model.
Highlights
With the development of geophysical science and the growth of human demand for resources, deep exploration of the crust and mantle is crucial
This study investigates an optimization method for induction magnetometers working at 10 kHz to 100 kHz based on a three-dimensional finite element simulation model
In order to improve detection sensitivity of induction magnetometers, the loss including eddy current loss and hysteresis loss is selected as the objective parameter
Summary
With the development of geophysical science and the growth of human demand for resources, deep exploration of the crust and mantle is crucial. Shi et al investigated the induction magnetometer in the frequency band from 1 mHz to 10 kHz. Compared with the well-known sensor MFS-06, the best induction magnetometer has a smaller size and similar noise equivalent magnetic induction (NEMI) level [15]. This paper analyzes the main influencing factors of the loss of induction magnetometers and determine the optimal sensor parameters based on finite element simulation. According to the law of electromagnetic induction, the influencing factors of loss include the type of material, the excitation frequency, the lift-off, and the size of the magnetic core. The response surface method is applied to establish the regression model for each parameter and loss at the optimal level combination based on the results of the orthogonal experiment.
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