Timeline for Noise amplitude increases as sample rate increase
Current License: CC BY-SA 3.0
11 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 9, 2012 at 19:25 | vote | accept | SimaPro | ||
| Apr 2, 2012 at 8:12 | comment | added | nibot | Consider asking at dsp.stackexchange.com . | |
| Apr 2, 2012 at 8:11 | comment | added | nibot | It would be helpful if you could post a plot of your data (with examples using both sample rates). | |
| Apr 2, 2012 at 2:50 | answer | added | tmac | timeline score: 1 | |
| Mar 3, 2012 at 3:45 | comment | added | Colin K | Probably not, unless the noise properties of that sensor are unusual. It would mean, however, that you aren't really being hurt by the noisier data. Fitting a line to more, but noisier, data is just as good as fitting to fewer but averaged points (making a few reasonable assumptions about your equipment). You should edit that information in to your question. I'll try to make a more detailed answer when I'm not on a smartphone. | |
| Mar 3, 2012 at 2:39 | comment | added | SimaPro | What you say about time averaging could be the case - that would mean that we have a lot of noise intrinsically in the collection. Then would that mean theoretically there is a sample rate if we go above which, the amplitude would stay the same? | |
| Mar 3, 2012 at 2:34 | comment | added | SimaPro | Hey Colin, so its called a load cell: basically its a probe attached to the arm of this machine which slowly (.1 mm/sec) moves downward into the material while simultaneously measuring resistance from which it determines the reaction force (how this works exactly i'm not sure). The machine is attached to a computer which allows us to select the sample rate. I think the measurement happens at the same rate but the sending to the computer happens at a faster rate when sample rate increases (i think?). | |
| Mar 3, 2012 at 1:26 | comment | added | Colin K | Could your equipment be doing averaging over the time between samples? You need to really explain how this measurement is being made. | |
| Mar 3, 2012 at 1:22 | comment | added | Colin K | What exactly is being sampled? Is there some probe moving through a whole series of measurements each second? Or is there just one datum measured? In other words, does the measurement actually happen faster when the sampling is faster? Does the probe move faster, or are the samples just spaced closer? Could the sample behave differently at high speed? | |
| Mar 2, 2012 at 23:17 | answer | added | zacharoni16 | timeline score: 0 | |
| Mar 2, 2012 at 23:04 | history | asked | SimaPro | CC BY-SA 3.0 |