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Comparative study of ZnCr2O4-K2CrO4 ceramic humidity sensor using computer controlled humidity measurement set-up

Kavasoglu, N and Kavasoglu, A. S. and Bayhan, M (2006) Comparative study of ZnCr2O4-K2CrO4 ceramic humidity sensor using computer controlled humidity measurement set-up. Sensors and Actuators A: Physical, 126 (2). 355 - 361.

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Official URL: http://www.sciencedirect.com/science/article/B6THG...

Abstract

A home-made ZnCr2O4–K2CrO4 ceramic humidity sensor was studied using a commercially available reference humidity sensor, SHT75 from Sensirion. The main advantages of our developed set-up for humidity measurements are low cost and high resolution yielding a full set of information on the variation of humidity. Air moisture sensitive ceramic body prepared using K2CrO4 (20%) in ZnCr2O4 was produced from the solid-state reaction between zinc oxide and chromite oxide at high temperatures. The dc resistance as a function of relative humidity (RH) showed a strong dependence, decreasing over several orders of magnitude with increasing humidity being a smooth exponential. The air moisture dependent resistance of the ceramic sensor is converted into voltage signals using a circuitry. Basically it consists of an operational amplifier and an A/D converter. Long-term stability measurements showed that ZnCr2O4–K2CrO4 ceramic system has potential use as an active material in humidity sensors.

Item Type:Article
Uncontrolled Keywords: Humidity measurement set-up; ZnCr2O4–K2CrO4 ceramic humidity sensors; SHT75
Subjects:Analytical Science > Nanotechnology for sensing and actuating
ID Code:4682
Deposited By:SPI
Deposited On:08 Apr 2009 15:01
Last Modified:08 Apr 2009 15:01

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