Pressure Strip

transducers

http://cdn.sparkfun.com/datasheets/Sensors/Pressure/FSR408-Layout2.pdf

Using a pressure strip to measure bladder pressure seems nonsensical to me.

Depends on the accuracy/resolution/error you want/can live with.

Are you gluing/laminating/bonding something with an irregular shape?

Or cracking walnuts? Sometimes I make myself laugh.

Well, there's a lot you, or any of us, doesn't know.

I have used these before in my life in coating & laminating.

This company has been around for awhile and were very helpful:

http://www.sensorprod.com/campaign/pressure-sensitive-paper/index.php?mcode=GC-Pressure%20-%20Pressure%20Paper%20-%203&gclid=CNWnpKCgnskCFU6SfgodiI4I-w

They even have free samples!

If it's a bladder then surely the pressure inside will accurately reflect the pressure on the surface.

Just use a regular pressure gauge on the connection between the incoming line and the bladder. Job done!

Where does the 14.7 PSI atmospheric component figure into the xx PSIG reading on the gauge?

I'm trying to work this out with Common Core math logic and I can't make it figure.

Who do I call?????

It doesn't matter.

It may matter, depending what OP is really trying to accomplish, that he hasn't told us yet.

I have used pressure strips as a switch trigger but never for an analogue reading. A large force over a small area would give the same output as a small force over a large area. As the bladder inflates the area in contact with the strip changes non-linearly so there is no way you can assess the force. Also calibration would be very difficult and any tiny change in air pressure in the sealed sensing circuit e.g caused by a small temperature change, would render all readings invalid.

If the sensors were individually quite small in a matrix and the applied load was a spreadable bladder with known characteristics, then if the applied load was to cover an increasing number of the quite small sensors, then counting the number of quite small sensors that have a 'indicative load', could be used via a look up table to indicate the load value.