Electronic Materials Letters

, Volume 6, Issue 4, pp 215–220 | Cite as

Response improvement of integrated humidity sensors using a micropump

Article

Abstract

An integrated humidity sensor system with micropumps was fabricated, and its pumping capability and response characteristics were investigated. The suitability of valve-less micropumps in the sensor system was demonstrated through a simple micromachining process using deep reactive ion etching (DRIE) and an anodic bonding step. The Reynolds number of the pump with a diffuser angle of 19° is about 1200, and the maximum flow rate is 0.176 μl/min. The optimum resonant frequency is 100 Hz for water and 600∼800 Hz for air. The sensitivity of the humidity sensor system with pumping is 10 times higher than it is without pumping for repeated refresh cycles.

Keywords

micropump integrated humidity sensor DRIE CMOS response time 

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Copyright information

© The Korean Institute of Metals and Materials and Springer 2010

Authors and Affiliations

  1. 1.Department of Electronic EngineeringKyungnam UniversityGyeongnamKorea

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