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Vol. 149, No. 2, February 2013, pp. 193-198

 

Bullet

 

Gas Detection by Drift and Diffusion Characteristics in a Porous Medium

 

1 Aboozar Parvizi, 2* Mohammad Orvatinia, 3 Najmeh Khabazi Kenari

1 Electrical Faculty, Islamic Azad University Branch of Khorramshahr, Khorramshahr, Khouzestan, Iran

Tel.: +98-916-6034286, fax: +98-611-4442479

2* The faculty of applied Science of Information and Communication Technology, Tehran, Iran

Tel.: +98-21- 44659661

3 Electrical Faculty, Islamic Azad University Branch of Khorramshahr, Khorramshahr, Khouzestan, Iran

Tel.: +98-912-5193392

E-mail: Aboozarparvizi@yahoo.com, Orvatinia@yahoo.com, n_khabazi@yahoo.com

 

Received: 7 November 2012   /Accepted: 14 February 2013   /Published: 28 February 2013

Digital Sensors and Sensor Sysstems

 

Abstract: This study presents a new method to selectively detect the components in a gas mixture. The proposed apparatus comprises of a commercially available non/partially selective semiconductor gas sensor and a cm-long capillary porous media. The attachment is arranged so that upon exposure, the target gas is forced to pass through a porous medium by drift and diffusion before alerting the sensor. It is found that the components with less molecular mass in the mixture passes much faster than heavier components and is sensed at an earlier stage of the device response. The response of the proposed sensor to a gas mixture of two components is mathematically analyzed. The results indicate that the existence of a predetermined target gas can be detected explicitly by mathematical analysis of the device transient response. The experimental verification of the analytical results was carried out by assembling prototype sensor configuration. It was shown that the prototype sensor can distinguish two individual reducing and combustible gases from their mixture.

 

Keywords: Chromatography, Diffusivity, Gas sensor, Porous media, Gas identification

 

 

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