The Spectroscopy Net
Gateway to Spectroscopy > Data Acquisition > Intensity measurement > Spikes

Spikes

Spikes

In Intensity II - contrary to Intensity I - the conclusion appears to be that the best results are achieved with a large number of measurements with a short integration time. Statistically this makes sense, the more measurements the better defined is the distribution of values and hence the better defined is the mean. This, after all, is the basis of Student's t distribution. Conversely, part of the uncertainty in a small number of measurements is that the distribution is not well defined. But there are other advantages to using a large number of measurements. Sometimes a spike occurs in intensity measurements. There are many possible causes of occasional spikes. The problem is that without care they can affect the mean.

Two spikes are shown here, the other points were generated as normal noise about a mean of 100. Such spikes can be detected in software and eliminated.