Automotive Simpler Force Sensor: Using Liquid Oil-Filled Chamber and Pressure Sensor

[jjohn33]

Is it possible to use a liquid oil filled sealed chamber with a movable membrane connected to a pressure sensor to measured the force applied to the membrane?
The reason is have a simpler solution to measured the force.

 

[anorlunda]

The "sensor" shown in your figure might have a membrane inside doing just what you described. It depends on the make and model of sensor. There are many ways to do it.

 

[jjohn33]

The green part should be a thin movable steel membrane that is connected to a rod and that rod has eg 300N applied force.
The sensor transforms that force to a pressure
That was my idea,

 

[jjohn33]

Do you have some example to do this?

 

[Mech_Engineer]

The reason is have a simpler solution to measured the force.

What design are you hoping this concept will be "simpler" than? A piezoelectric force sensor is pretty simple considering it has no moving parts and a direct connection to an electrical circuit for logging.

See here: https://en.wikipedia.org/wiki/Piezoelectric_sensor

 

[jjohn33]

Ok thanks can it handel force for 300-400N?
Do you know some manufacturers?

 

[Mech_Engineer]

Ok thanks can it handel force for 300-400N?
Do you know some manufacturers?

There are literally hundreds of options out there because this is a very common measurement need. I'd recommend doing some searching on a product comparison directory like IEEE GlobaSpec for a start, see here: IEEE GlobaSpec Search: Force Sensors.

Omega sells a lot of different sensors, including ones in your operating range. Take a look here: https://www.omega.com/section/load-cells-force-sensors-torque.html

 

[jjohn33]

Thank you I will read it

 

[jjohn33]

But if I have a constant force at e.g. 300N for couple of minutes < 10 min I thougt the piezoelectric sensors maybe cannot measured that constant load?

 

[MRFMengineer]

You may want to look into piezoresistive based load sensors as well, typically more optimized for DC loads like you mentioned.