Need to chose a sensor for a presentation

[JSBeckton]

As stated I need to chose a somewhat simple sensor (needs to be fully explained in 3 slides) for a short presentation. I cannot use anything we have discussed at length (accelerometer, strain gauge, thermocouple, LVDT).

Any ideas?

Thanks

 

[Asphodel]

http://en.wikipedia.org/wiki/SQUID

 

[Andy Resnick]

Here's some simple ones:

Voltmeter
pH meter
Osmolarity meter
pressure gauge
photosensor

If you want to get sneaky, talk about a 'chip log' or a 'log line' to measure velocity- that's about as simple as it gets.

http://www.physlink.com/education/askexperts/ae400.cfm