Next Article in Journal
Previous Article in Journal
Sensors 2012, 12(9), 12729-12740; doi:10.3390/s120912729
Article

A One ppm NDIR Methane Gas Sensor with Single Frequency Filter Denoising Algorithm

1,2,* , 3
 and 3
Received: 16 July 2012; in revised form: 10 September 2012 / Accepted: 11 September 2012 / Published: 18 September 2012
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [632 KB, uploaded 21 June 2014]   |   Browse Figures
Abstract: A non-dispersive infrared (NDIR) methane gas sensor prototype has achieved a minimum detection limit of 1 parts per million by volume (ppm). The central idea of the design of the sensor is to decrease the detection limit by increasing the signal to noise ratio (SNR) of the system. In order to decrease the noise level, a single frequency filter algorithm based on fast Fourier transform (FFT) is adopted for signal processing. Through simulation and experiment, it is found that the full width at half maximum (FWHM) of the filter narrows with the extension of sampling period and the increase of lamp modulation frequency, and at some optimum sampling period and modulation frequency, the filtered signal maintains a noise to signal ratio of below 1/10,000. The sensor prototype provides the key techniques for a hand-held methane detector that has a low cost and a high resolution. Such a detector may facilitate the detection of leakage of city natural gas pipelines buried underground, the monitoring of landfill gas, the monitoring of air quality and so on.
Keywords: methane; NDIR; FFT; gas sensor methane; NDIR; FFT; gas sensor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Zhu, Z.; Xu, Y.; Jiang, B. A One ppm NDIR Methane Gas Sensor with Single Frequency Filter Denoising Algorithm. Sensors 2012, 12, 12729-12740.

AMA Style

Zhu Z, Xu Y, Jiang B. A One ppm NDIR Methane Gas Sensor with Single Frequency Filter Denoising Algorithm. Sensors. 2012; 12(9):12729-12740.

Chicago/Turabian Style

Zhu, Zipeng; Xu, Yuhui; Jiang, Binqing. 2012. "A One ppm NDIR Methane Gas Sensor with Single Frequency Filter Denoising Algorithm." Sensors 12, no. 9: 12729-12740.



Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert