Calibration Uncertainty Evaluationof D-Dot Sensors

The purpose of the work is to design a novel impedance adapter to set up a mono-cone standard field generation system with a large clear time and a large dynamic range. To transform the impedance from 50 Ω (the output impedance of the signal generator) to 75 Ω (the input impedance of the cone), the gradient structures with 11 sections are designed for the impedance adapter. The measured VSWR of the system is below 1.5 from 300 to 2.25 GHz. The insertion loss of the designed is about −35 dB. The system with the designed impedance adapter works well. This is validated by the results of the standard open-air test site in National Institute of Metrology, China. K E Y W O R D S75 Ω, impedance adapter, mono-cone, OTAS, time-domain electromagnetic pulse, traceability

show abstract

“…The half cone angle ( θ 0 ) is 31.45°. The input impedance of the mono‐cone over a ground plane is expressed as

Z_{in} = 60 \ln \cot ((), \frac{θ_{0}}{2}) .

…”

Section: Mono‐cone Standard Field Generation System With 3145° Half mentioning

confidence: 99%

A novel impedance adapter for the time‐domain electromagnetic pulse standard field generation setup

Wang

Gong

Yang

et al. 2020

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…In addition, since the D-dot sensor is not a standard differential device from a broadband perspective, direct integration at high or low frequencies is not effective enough. As a result, the precision of calibration, which is affected by the integral error of the recovery signal, continues to impede its practical application [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Identification and Compensation for D-Dot Measurement System in Transient Electromagnetic Pulse Measurement

Jin

Liu

2022

Sensors

View full text Add to dashboard Cite

The measurement of the transient pulsed electromagnetic (EM) field is essential for analyzing electromagnetic compatibility. Due to their good performance, D-dot sensors, combined with numerical integration computation for signal recovery, are commonly used to measure electromagnetic pulses (EMPs). However, the integration approach is occasionally flawed due to a non-ideal frequency response or noise, causing distortions in the reconstructed signal. In order to better understand the dynamic performance of the sensor, a nonlinear Hammerstein model is employed in the system identification for the sensor with the calibration data collected in the laboratory environment. When identifying the linear component based on the ultra-wideband characteristics of the measured transient pulse, a two-step identification approach with two different pulse excitation modes, low frequency and high frequency, is utilized to conduct the modeling across the entire frequency range. Based on the reliable identification and modeling of the D-dot sensor, a compensation system that corresponds to the nonlinear Hammerstein model has been developed for the practical signal recovery of the incident E-field. After compensation, the dynamic characteristics of the sensor are significantly improved, and the system compensation approach outperforms the integration method in signal recovery for the incident E-field.

show abstract