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Imitational modeling of synchronous measuring detector with increased noise immunity and precision
摘要： In this paper, an example of application, simulation results, noise and precision properties of a synchronous measuring detector with increased noise immunity and precision (not less than 1%) for the operation providing of primary sensors – thermal sensors and bridge sensors, in particular Hall sensors for magnetic field measurements are considered. As a result of the research, it was discovered that increasing the sensitivity of magnetometers based on Hall sensors leads to the allocation of the initial useful signal of the ultra-low level against the background of noise comparable with it. To allocate the output signal of the Hall sensor or thermal sensor in the background of noise, it is proposed to feed it with harmonic current with the further allocation of the information signal using a in-phase detector with a narrowband low-pass filter.
关键词： sensor,detector,precision,noise immunity,modeling
更新于2025-09-23 15:23:52
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Lorentz Reflect-Phase Detector for Moisture and Dielectric Sensing
摘要： We experimentally investigate a new class of resonant dielectric sensors that are based on reflectance phase measurement in the Lorentzian dispersion regime. The Lorentzian dispersion, also known as anomalous dispersion, is characterized by a strong wave absorption accompanied by a double reversal of the phase (flip-flop phase). Since the Kramer-Kronig relation holds, a phase-slope measurement is enough to completely characterize a dielectric material at in the narrowband microwave spectrum. Due to strong dispersion, the Lorentz sensors are noise immune and are less affected by external circuit changes. Therefore, they can be potentially applied in hostile environments such as high temperature furnaces. The proposed detection method is inspired from the optical measurement technique known as spectroscopic ellipsometry. We apply the anomalous phase detection to estimate dielectric and moisture changes.
关键词： dielectric sensing,microstrip resonators,anomalous dispersion,Lorentzian dispersion,resonant sensors,noise immunity
更新于2025-09-09 09:28:46