Design and simulation of MEMS based humidity sensor

Z. C. Alex, Govardhan K
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引用次数: 3

Abstract

Humidity plays a very major role in various industries. Monitoring and controlling the humidity is of great importance for the reliable operation of various systems. Micro cantilever systems have been found to be highly suited for sensing purposes. A micro cantilever humidity sensor based on capacitive principle is designed and various analyses were performed on the sensor. The polyimide being the sensing layer is coated on the cantilever beam. The beam is provided with movable electrode. The deflection of beam causes capacitance change, which is related to the change in humidity. The design also incorporates a platinum based temperature sensor to compensate for change in humidity due to temperature and also a platinum based heater to regenerate the sensing layer for obtaining next measurement. The structure was designed using Coventorware and Intellisuite. The structure showed a good linearity and good sensitivity in the regions from 10-40 % RH in all temperatures in human adaptive ranges. The beam had an appreciable deflection causing a notable change in capacitance. The sensitivity was in order of pico to femto farads per %RH change.
基于MEMS的湿度传感器设计与仿真
湿度在各行各业中起着非常重要的作用。湿度的监测和控制对各种系统的可靠运行具有重要意义。微悬臂系统已被发现非常适合于传感目的。设计了一种基于电容原理的微悬臂式湿度传感器,并对其进行了各种分析。作为传感层的聚酰亚胺被涂覆在悬臂梁上。所述横梁上设有活动电极。梁的偏转引起电容的变化,电容的变化与湿度的变化有关。该设计还包括一个基于铂的温度传感器,以补偿由于温度引起的湿度变化,以及一个基于铂的加热器,以重新生成传感层,以获得下一次测量。采用Coventorware和Intellisuite软件进行结构设计。该结构在10- 40% RH范围内具有良好的线性和灵敏度。光束有明显的偏转,引起电容的显著变化。灵敏度为每%RH变化微至飞至法拉。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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