Smell Detectors?

Just a question about odour detectors,..Or electronic nose whatever you want too call it,...My pal would like too know how they work...If any one knows how the circuit works, or were you could get the part that senses the odours, we would like too know,....If any one does.

Here's a site that sell's what they refer to as a NoseChip.

**broken link removed**

Mike

There was a related article in EEtimes, Feb 9th issue, find it here:
**broken link removed**

post:

Thanks Those sites gave us the info we needed, now off to a new project..You guys rock!