Sensors & Transducers Journal

    (ISSN 1726- 5479)

Vol. 77, Issue 3, March 2007, pp. 1058-1064

Data Acquisition and Digital Filtering for Infrasonic Records on Active Volcanoes

José Chilo^1,2, Thomas Lindblad¹

¹Royal Institute of Technology, S-106 91 Stockholm, Sweden

²University of Gävle, S-801 76 Gävle, Sweden

Received: 27 February 2007  / Accepted: 15 March 2007 /   Published: 26 March 2007

Abstract: This paper presents the design of a digital data acquisition system for volcanic infrasound records. The system includes four electret condenser element microphones, a QF4A512 programmable signal converter from Quickfilter Technologies and a MSP430 microcontroller from Texas Instruments. The signal output of every microphone is converted to digital via a 16-bit Analog to Digital Converter (ADC). To prevent errors in the conversion process, Anti-Aliasing Filters are employed prior to the ADC. Digital filtering is performed after the ADC using a Digital Signal Processor, which is implemented on the QF4A512. The four digital signals are summed to get only one signal. Data storing and digital wireless data transmission will be described in a future paper.

Keywords: Volcanic Infrasound, Data Acquisition, Digital Filtering, Digital Signal Processor

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