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Comparison of capacitive versus resistive mode of sensing for vapor phase explosive detection

机译：气相爆炸物检测的电容式和电阻式传感方式比较

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This paper presents a comparison of resistive and capacitive sensors with a sandwiched dielectric material as a sensing layer. The paper focuses on a fabrication process along with two different techniques for characterization of sensors aimed for vapour phase explosive detection. The proposed sensors feature a special coating of TiO(B) nano-particles in between two electrodes of Metal-Insulator-Silicon (MIS) structure which leads to a selective reaction with the target molecules. A comparison between two signal detection approaches namely, a) change in resistance and b) change in capacitance with the same sensor structure, is carried out on the basis of temperature and humidity variations in the atmosphere. It is shown that the capacitive measurements are more robust to temperature and humidity changes over resistive measurements. Although the change in the resistance due to explosives' exposure is 50%, the base resistance (R) of the structure reduces drastically with 7.5% variation at higher temperatures. This makes the resistive measurements highly prone to false positives. On the other hand, the base capacitance remains almost constant with 0.2% variation during temperature variation with 2.5% change in capacitance on exposure to explosives.
机译：本文将电阻式和电容式传感器与夹层介电材料作为传感层进行了比较。本文着重介绍一种制造工艺以及两种不同的技术，以表征用于气相炸药检测的传感器。拟议中的传感器在金属-绝缘体-硅（MIS）结构的两个电极之间具有TiO（B）纳米颗粒的特殊涂层，从而导致与目标分子的选择性反应。基于大气中的温度和湿度变化，对两种信号检测方法（即a）电阻变化和b）电容变化进行比较。结果表明，与电阻测量相比，电容测量对温度和湿度变化的鲁棒性更高。尽管由于爆炸物的暴露引起的电阻变化为50％，但在较高温度下，结构的基本电阻（R）急剧降低了7.5％。这使得电阻测量极易出现误报。另一方面，在温度变化期间，基本电容几乎保持恒定不变，变化为0.2％，而暴露于炸药时电容变化为2.5％。

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