Abstract
D-dot sensors can realize the non-contact measurement of transient electric fields, which is widely applied to electromagnetic pulse (EMP) measurements with characteristics of the wide frequency band, high linearity, and good stability. In order to achieve accurate calibration of D-dot sensors in the laboratory environment, this paper proposed a new calibration method based on system identification. Firstly, the D-dot sensor can be considered as a linear time-invariant (LTI) system under corner frequency, thus its frequency response can be characterized by the transfer function of a discrete output error (OE) model. Secondly, based on the partial linear regression of the transfer function curve, the sensitivity coefficient of the D-dot sensor is obtained. By increasing the influence weight of low-frequency components, this proposed method has better calibration performance when the waveform is distorted in the time domain, and can artificially adapt to the operating frequency range of the sensor at the same time.
Highlights
The measurement of the transient electric fields is an important part of electromagnetic pulse (EMP) protection research
In order to verify the sensitivity coefficient calibrated by the system identification method, the experimental was carried out in the laboratory.by the system identification method, the
Field measured by the high voltage probe; the red represents to the waveform of numerical integration multiplied by the sensitivity coefficient calibrated by system identification method, 2.70 × 1011 (V/m/s)/V, which is measured by the D-dot sensor
Summary
The measurement of the transient electric fields is an important part of electromagnetic pulse (EMP) protection research. The D-dot sensor is widely applied to EMP measurements for its wide frequency band, high linearity, and good stability [2,3,4,5] This passive non-contact measurement method is simple to implement and easy to arrange with a small distortion to the measured field. Considering the Norton equivalent circuit shown, the antenna of D-dot sensor can beTheoretical regarded asBasis a current source, and current in the time domain can be written: du (t ) u 0 is =C 0. Considering the Norton equivalent circuit shown, the antenna of D-dot sensor can be regarded a current source, andbecurrent in the time can domain be written: represented in thedomain frequency as: Thenasoutput voltage u0 can. To theflux electric flux the measured electric field; Celectric refers tofield; the equivalent capacitance of the D-dot sensor; R to the
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