detection with high speed HAVE changes at high speed

I'm working on a helmet testrig. We use the card M PCI-6251. An accelerometer 3 axes is set inside the helmet and its fall of variable height up to 3 m. During his fall, I need to gain entrance to the analog accelerometer (sampling > = 100 kHz) and also to find the speed with which he hits the bottom.

How I find the speed is two sensors spaced apart at the bottom of 4cm. When the helmet Assembly passes through the sensors, they become high momentarily and my DI me should get the corresponding time.

It's my problem and also very important part of the program. The data are acquired, for approx. 2 seconds. One entered analog from 3-channel sample rate > = 100 kHz, the second is a digital entry of these digital sensors (two proximity sensors) within 10msec helmet Assembly passes one sensor to another. I can't detect the moment when the sensors go high.

My first test was (fig Acq1) just a spot of digital input to the application. (flags should make sure I have time only once for each sensor). It always gives me the time 16msec difference, 32msec, or 0 for any speed.

My second try was the method of change detection (follow-up of the programs posted on the forum). This also seems to sense only, 0msec, 15msec or 31msec only. This is not true since heights higher than the helmet fell, it is faster, and for these the time difference between two sensors that it gives is zero.

The way I implemented change detection is, I just get of an hour for the first detection of change and second change detection only, where the structure case inside the structure of the event.

is there else a better way to do it?

Thank you very much.

Patricia

I see no reason why you would need external clock.  The PCI-6251 card has an internal clock.

I look through the viewfinder of the example for DAQmx examples using analog and digital inputs.  I think that might work for you is Multi-multifunction-read AI Synch Dig Chan.vi

Tags: NI Software

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