pressure impedance conversion mateiral

[shanmei]

is any material can change its impedance when it understands different pressure?

For example, if no pressure on it, the impedance is 0; with 100lb on it, the impedance is 100kohms. Or the impedance increases with the decrease of the pressure.

Thanks.

 

[Akanimo]

Hi,
You need something like strain gage?

 

[BradtheRad]

You might try experimenting with the conductive foam that IC's often have their pins stuck in as protection against static charge. You won't necessarily get the wide response you want, but if you get a repeatable reading then you can amplify it to make it usable.

 

[shanmei]

Thanks. I didn't find any material can change its resistance from several ohms ( idea is 0 ohm) to 100 ohms ( idea is infinite) under different pressure.

 

[KlausST]

Hi,

0 Ohms is impossible
Infinite Ohms is impossible, too.

Try to think in dynamics. R_high / R_low.

What dynamic range do you really need?
This is also a question of how you want convert and process the information.
A 10 bit ADC is able to convert a dynamic range of about 1000.

Klaus

 

[shanmei]

R_low is around 2ohms, R_high is around 500 ohms, so the dynamic range is 500/2=250, 20log10(250)=48dB. Thanks.