Shaker table calibrator

J

Jaguarjoe

Member

• Jul 15, 2013

• #1

I am building a small shaker table from a nice sub woofer and other junk err... stuff.
I am trying to figure out how to make an accurate vibration sensor to use as a calibration "standard". My first plan was to use a10 turn pot with the shaft attached to the platform through a small pulley.
The last place I worked had a shaker and had a Kistler accelerometer and a double integrator but that's a tad pricey.
Any ideas?

Thanks!

 

M

MrAl

Well-Known Member

Most Helpful Member

• Jul 15, 2013

• #2

Hi,

Plan on experimenting with non Newtonian fluids?

How about a small reflector with photo detector of some sort

 

alec_t

Well-Known Member

Most Helpful Member

• Jul 15, 2013

• #3

A cheap piezo disc with an inertial mass attached (though accuracy/repeatability is dubious)?

 

unclejed613

Well-Known Member

Most Helpful Member

• Jul 15, 2013

• #4

you could use a dual voice coil speaker. the second voice coil would provide the acceleration information

 

alec_t

Well-Known Member

Most Helpful Member

• Jul 15, 2013

• #5

.....perhaps add a coil to your existing sub-woofer?

 

J

Jaguarjoe

Member

• Jul 15, 2013

• #6

I never knew there were dual VC speakers. This sounds like a plan.

 

C

canadaelk

Active Member

• Jul 16, 2013

• #7

How about a non-contact Hall-effect setup? E

 

cowboybob

Well-Known Member

Most Helpful Member

• Jul 16, 2013

• #8

Using a pot might introduce unacceptabe wear issues.

Perhaps a variable inductor tuner element from an old car radio? Or a variable cap from a similiar device.

Either one controlling the frequency of a simple oscillator circuit whose output is fed to an appropriate opamp 2nd order bandpass filter. The output could be rectified (and filtered) giving a repeatable DC value.

Obviously not linear, but that could be dealt with a number of ways, if needed.

 

Mr RB

Well-Known Member

• Jul 16, 2013

• #9

A $5 accelerometer PCB with 3 analogue outputs.