hysteresis anyone?

[Bch]

Hi,

 I have two signals from two sensors, these will be put together to calculate the hysteresis. Is there anyone that can help or tip me of a complete programme or something to work with?

Appreciate all help!

Best regards,

Stefan in Sweden

[tinnitus]

Hello,

i don't know if there is existing function, but can you give us more details because it's not same complexity if :

1) you want to process on existing data ( you acquire an hysteresis cycle  an then analisys) or real time measure (analisys point afer point)

2) is it a physic hysteresis or electronical ? the output is aproximately 2 states ( ex 0-12V) or multiple (like magnetic hysteresis)

do you have a file of samples points to give us an idea of what you want to analyse

Cordialy

tinnitus  

[tinnitus]

mistake , to kill

tinnitus






Message Edité par tinnitus le 04-06-2008 08:58 AM

[Pnt]

hysteresis has a general meaning, it is not a function.

Please give us more details....

[Bch]

Hi,

It is for a system that calculates the hysteresis between the two curves shown in the inserted file, this picture may clear things up. The sensors are: 1 pressure sensor that registers the output voltage, and one magnetic sensor that also registers the output voltage. I would like to display the difference between the upper line and the lower line. '

At the moment i have solved this issue by printing out 500 samples from the magnetic and the pressure soutput voltage into a .xls file that displays the difference (hysteresis curve). Is there a better way to solve this?

I hope this information solves our problem?

Best regards

S

[Bch]

I suppose you can say that it is electronical because its the output voltage that im interested in. I can give you an .xls file tomorrow to show you how this looks like.

Once again, appreciate all help I can get.

Best regards

S

[Bch]

I forgot to say, I have an DAQ unit that interprets the signals from the sensors. Maybe not so important for you to know?? 🙂 I'm an LabVIEW amateure. Thanks,

Best regards.

/S

[tinnitus]

Hello,

It s just a details but x and y aren't inverted , it isn't stroke that depend of pressure ?

i take a look on what could be done...

I hope this information solves our problem?

Cordialy

Tinnitus




Message Edité par tinnitus le 04-08-2008 10:41 AM

[Bch]

Hi,

the stroke is of course dependent on the pressure.

Is there any more questions please let me know. Appreciate everything...

Best regards,

Stefan

[tinnitus]

hello,

here a very basic vi to measure hysteresis, it works only on clean outing signal because of simple detection (trigger function)
if not, try to filter or better to average signal

A details: your hysteresis seems to be slightly different at low and high level , here measure is taked at middle scale...
 you can change this by modifying "analyse point" 
cordialy

tinnitus