biomedical project

[nithik]

is it possible to provide 11mhz as input to labVIEW?

[BillMe]

That can't be answered in the given context. Please provide details of what it is you are trying to accomplish.

[nithik]

we are doing a bimedical project, title of our project is "eddy current based flexible sensor for contactless measurement of breathing".

the design consists of an colpitts oscillator. we have designed it and we obtained an output frequency of 11MHz. frequency should be counted using an frequency counter. so we are asked to convert the output sine wave into square pulse using an schmitt trigger, the output of schmitt trigger is given as input to labVIEW software as clock input using DAC. we should know whether it is possible to design in labVIEW software for 11mhz.

[BillMe]

Are you related to "rowdy"?

If you want to measure the frequency and display it in LabVIEW, you need a DAQ card or some other frequency measurement device, e.g, oscilloscope. Do you have such a thing? If so, what vendor and model number?

[rowdy]

DAQ card is available at our lab... but my doubt is.. is it possible to give such high frequency(MHz) as input in labVIEW? do we have to minimize the frequency before giving into the software?

[ejkaiser]

In case your DAQ card can handle 11 MHz (it needs a sampling rate of 22 Msample/s, better more) it is principally possible to handle the signal in Labview. But it is probably a huge overkill to do it that way.

As it seems you are mainly interested in the signal frequency it is much better to use a cheap hardware counter and interface to the computer via USB, RS232 or GPIB.

A hardware counter for 11 MHz with interface is cheap whereas a DAQ system for 11 MHz and the required computer power is quite expensive.

To summarize: your question whether DAQ with Labview at 11 MHz is feasible  is very justified: it won't be easy! My adice is to do the counting in hardware.

Cheers

Edgar

[falkpl]

If you converted the output to TTL using a schmitt trigger you can get the square wave as in input to a counter on your DAQ.  this is a frequency counter for square waves, it is very simple to setup and wxamples are in the example finder.  If you can not convert to a digital pulse train then it is much more difficult.  Most counters are 80-100MHz so you can get the 11MHz freq no problem with a resolutrion of +/- 1/80Mhz (newer devices are 100Mhz so you can measure freqs to 1/100 of a Mhz).

[RavensFan]

Why did you start a new thread instead of continuing in your original message thread where you were already getting help?

[BillMe]

Maybe he's like a past boss of mine...asking four or five of us (unbeknownst to the rest) for an answer to his question, then taking the mean.....

[rowdy]

thank u