Development of a personal dust monitor with a piezoelectric quartz crystal sensor

L. W. Wilson, M. J. Hepher, D. Reilly, J. D C Jones

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A monitoring system using the collection technique of electrostatic precipitation on to a piezoelectric sensing element is examined. The transduction mechanism is the change in the resonant frequency of the sensing element from its unloaded nominal value of 9 MHz caused by the collected dust. The monitor had the three main design areas (point-to-plane distance, precipitator voltage and electrode-to-dust-inlet distance) optimized at a flow rate of approximately 1 I min-1. This led to collection efficiencies greater than 97% with crystal mass sensitivity constants in the range 30-130 Hz µg-1 for the aerosol Arizona Road Dust. The total sampling time is limited by overloading of the sensing element by dust. A method of extending the sampling time by using compressed air to clean the sensing element is described.

Original languageEnglish
Pages (from-to)128-137
Number of pages10
JournalMeasurement Science and Technology
Volume8
Issue number2
DOIs
Publication statusPublished - Feb 1997

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