Research On Temperature Sensing Technology Based On Electromagnetic Metamaterial

Electromagnetic metamaterial is a kind of synthetic structural material with singular electromagnetic properties.It has abnormal dielectric constant and permeability characteristics which are different from those of natural materials.The strength of the singular electromagnetic response produced by the electromagnetic metamaterial is closely related to the material composition,structure shape and parameters,electromagnetic environment and other factors of the structure.In addition,mercury,as the only single metal existing in liquid form at room temperature and atmospheric pressure,has excellent conductivity,thermal conductivity,thermal expansion and other properties.In this paper,various excellent properties of mercury are utilized to study the effective fusion of mercury and high-Q-value electromagnetic metamaterial,so as to realize the integrated design of temperature sensing technology based on mercury-based high-Q-value electromagnetic metamaterial,and improve the temperature sensing sensitivity and resolution.Through the circuit design to achieve signal generation,automatic detection and other functions,complete the high-sensitivity,high-resolution mercury-based temperature sensing sensor modular design.The main contributions and innovations of this article are summarized as follows:1 According to the equivalent circuit analysis method,the relevant parameters such as the equivalent inductance and capacitance of a broad-side coupled mercury-based split resonance electromagnetic metamaterial were derived,and the electromagnetic characteristics of the structure were simulated.The theoretical calculation and simulation results of dielectric constant,permeability and other parameters were compared to verify its correctness.2 Using the formula of resonance frequency of the classical dipole and combining with the formula of thermal expansion theory,the thermal sensitivity formula of the classical mercury-based dipole structure was derived,which was verified by the electromagnetic simulation software,and the specific ways to improve the sensitivity were explored.Then research the multiple types resonant mode of mercury electromagnetic metamaterial under different environmental temperature change rule and the dynamic range of resonant characteristics,the simulation results show that there is a big performance difference between different high-Q resonant modes,with the Q value up to 3300,It provides theoretical and numerical basis for the further design of high sensitivity and resolution temperature sensor;The design and research of mercury-based temperature sensor units are carried out based on the above high-Q-value resonance modes,and the design idea,simulation method and implementation approach of mercury-based super-structure high-Q-value sensor units are given.3 The miniaturization of mercury-based high Q value electromagnetic metamaterial temperature sensor module is studied.The circuit structure required by the temperature sensor module is studied and analyzed.From the aspects of signal generation,reception and processing,a hardware circuit with good temperature stability is formed through the selection of electronic devices and the design of peripheral circuits,and the miniaturization of the sensor is realized.The encapsulation form and resonant characteristic test scheme of mercury-based resonant ring sensor are discussed.Experimental analysis and numerical simulation show that the sensitivity of the temperature sensor is as high as 1459 mV/?,and the highest resolution is 0.00014 ?.It provides theoretical and numerical basis for the design and analysis of a more reasonable temperature sensor based on mercury-based electromagnetic metamaterial.The research results of this paper will establish the research and application technology system of mercury-based metamaterial temperature perception,which has significant scientific significance and engineering value.