Next Article in Journal
Ultra-Low Power High Temperature and Radiation Hard Complementary Metal-Oxide-Semiconductor (CMOS) Silicon-on-Insulator (SOI) Voltage Reference
Previous Article in Journal
New Methodology of Designing Inexpensive Hybrid Control-Acquisition Systems for Mechatronic Constructions
Sensors 2013, 13(12), 17241-17264; doi:10.3390/s131217241
Article

Active Self-Testing Noise Measurement Sensors for Large-Scale Environmental Sensor Networks

1,* , 1,2
,
1,2
,
1,2
 and
1,2
1 Department of Electronics and Informatics (ETRO), Vrije Universiteit Brussel, Pleinlaan 2, Elsene 1050, Belgium 2 Department of Industrial Sciences and Technology (INDI), Vrije Universiteit Brussel, Pleinlaan 2, Elsene 1050, Belgium
* Author to whom correspondence should be addressed.
Received: 11 October 2013 / Revised: 26 November 2013 / Accepted: 28 November 2013 / Published: 13 December 2013
(This article belongs to the Section Sensor Networks)
View Full-Text   |   Download PDF [2843 KB, uploaded 21 June 2014]   |   Browse Figures

Abstract

Large-scale noise pollution sensor networks consist of hundreds of spatially distributed microphones that measure environmental noise. These networks provide historical and real-time environmental data to citizens and decision makers and are therefore a key technology to steer environmental policy. However, the high cost of certified environmental microphone sensors render large-scale environmental networks prohibitively expensive. Several environmental network projects have started using off-the-shelf low-cost microphone sensors to reduce their costs, but these sensors have higher failure rates and produce lower quality data. To offset this disadvantage, we developed a low-cost noise sensor that actively checks its condition and indirectly the integrity of the data it produces. The main design concept is to embed a 13 mm speaker in the noise sensor casing and, by regularly scheduling a frequency sweep, estimate the evolution of the microphone’s frequency response over time. This paper presents our noise sensor’s hardware and software design together with the results of a test deployment in a large-scale environmental network in Belgium. Our middle-range-value sensor (around €50) effectively detected all experienced malfunctions, in laboratory tests and outdoor deployments, with a few false positives. Future improvements could further lower the cost of our sensor below €10.
Keywords: sensor testing; quality assessment; environmental monitoring sensor testing; quality assessment; environmental monitoring
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
SciFeed

Share & Cite This Article

Further Mendeley | CiteULike
Export to BibTeX |
EndNote |
RIS
MDPI and ACS Style

Domínguez, F.; The Cuong, N.; Reinoso, F.; Touhafi, A.; Steenhaut, K. Active Self-Testing Noise Measurement Sensors for Large-Scale Environmental Sensor Networks. Sensors 2013, 13, 17241-17264.

View more citation formats

Related Articles

Article Metrics

For more information on the journal, click here

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert