Application of flexible RF sensors for humidity and temperature measurements within PEM fuel cell
Date Issued
2011
Date
2011
Author(s)
Huang, Hao-Hsiu
Abstract
Flooding at flow channels has an influential impact on the performance of PEM (proton exchange membrane) fuel cell. As a result, local humidity and temperature measurement at flow channels is greatly important. However, the size of conventional humidity and temperature meter is too large to be embedded into a fuel cell. Due to the reason, the content of this research is to establish an integrated thin, flexible micro humidity and temperature sensor with a wireless module for achieving the feasibility and the convenience of measurement within fuel cells.
This study aims to develop a portable, non-intrusive and in-situ wireless sensing system for fuel cells. The system consists of three parts: a flexible capacitive humidity sensor, a resistive temperature sensor, and a RF module for signal transmission. The results shows that the capacitive humidity sensor has a high sensitivity of 0.83pF/%RH and the resistive temperature sensor also exhibits a high sensitivity of 2.94×〖10〗^(-3) ℃^(-1). The established RF module can transmit the signals from the two sensors to any location up to 4 m with the responding time less than 0.25sec. In the cell performance comparison, the performance measurements demonstrate that the maximum power density of the fuel cell without and with the sensors are 15.90 mW‧cm^(-2) and 14.76 mW‧cm^(-2), with only 7.17% power loss.
Subjects
micro humidity sensor
micro temperature sensor
RF module
measurement within fuel cells
Type
thesis
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