Flow compensation in a MEMS dual-thermal conductivity detector for hydrogen sensing in natural gas

Conference paper (2015)

Authors

G. de Graaf Electronic Instrumentation -

A.N. Abarca Prouza Electronic Instrumentation -

R.F. Wolffenbuttel Electronic Instrumentation -

Research Group

Electronic Instrumentation () (TU Delft)

DOI: https://doi.org/10.1109/TRANSDUCERS.2015.7181145

MEMS Hydrogen sensor Thermal conductivity Detector Flow compensation

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Published Date

06-08-2015

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

Conventional thermal conductivity detectors (TCDs) demonstrate a flow dependence. The approach presented here to reduce the flow dependence is based on the on-line flow compensation using two thin-film sensors on membranes in parallel on the same chip that are differentially operated. These are laterally identically, but with a different depth of the detection chamber, resulting in different quasi-static sensitivities to the thermal conductivity of the sample gas. The effects of conduction and convection in the structure have been studied using COMSOL Multiphysics. First prototypes have been fabricated and are presently tested.

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