using a draw wire sensor and cost

Thread Starter

sully1071

Joined Nov 8, 2011
5
Im carrying out a project where i need to find velocity and acceleration of a horizontal motion, the movement of the sensor is limited so an LVDT cant be used. Im looking at using a draw wire? But im not familiar with them.

Can you use a draw wire to calsulate velocity and acceleration?

Any help is appreciated..
 

luvv

Joined May 26, 2011
186
From what i can find its just a rotary encoder w/ a pulley attached.

Looks like it could be used to do what you wanted tho they look a bit pricey.

Don't know what sort of accuracy you need but there are plenty of homebrew encoder ideas out there.

Think the issue would be software to interpret and graph the data.

It would seam a person could just use a hall effect sensor to send pulses to a PIC where they could be counted and graphed .

Then it's just a matter of diameter of the pulley vs. RPM for velocity.

And pulse width for acceleration.


Think there is some engine dyno software out there that is specially suited for dealing w/ that kind of data but it Can't be discussed here.

Just my 2 cents ...

-luvv-
 

Bernard

Joined Aug 7, 2008
5,362
Tell us more about sensor movement, & definition of VLDT. A series of beam break detectors is cheap & can be supplied to a PIC or via hardware
 

Bernard

Joined Aug 7, 2008
5,362
Thanks, hgmjr,you killed two birds with one stone. I designed & built a " draw wire " back in 1958, & did not know that was what it was called. Was part of gama ray well logging unit; measuring wheel was one ft in circumference driving a chart recorder. Probe was lowered & raised with an electric wench holding 2500 ft of 1/4 in cable.
 
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