Tag Archives: noise
Uncertainty in Measurement of Absorbance
In absorption spectroscopy, precision is limited by indeterminate errors—primarily instrumental noise—introduced when measuring absorbance. Precision is generally worse for low absorbances where P0≈ PT, and for high absorbances when PT approaches 0. We might expect, therefore, that precision will vary … Continue reading
Effect of Signal Averaging on Signal-to-Noise Ratio
Examples showing the effect of signal averaging on a spectrum’s signal-to-noise ratio. From top to bottom: spectrum for a single scan; average spectrum after four scans; and average spectrum after adding 16 scans.
Indeterminate Errors and Noise
Indeterminate errors are random in nature and affect the reproducibility and repeatability of analytical measurements. We can assign indeterminate errors to several sources, including collecting samples, manipulating samples during the analysis, and making measurements. The data shown here, for example, show … Continue reading