Signal-to-Noise Ratio

Instrument Sensitivity

Improving this ratio allows for the detection of trace amounts of substances that would otherwise be lost in the electronic noise. Signal-to-noise ratio is influenced by the quality of the detector and the stability of the light source in spectrophotometry. Technicians optimize these variables to get the best possible data from a sample.

Data Interpretation

When the ratio is low, it becomes difficult to distinguish between a real chemical peak and random fluctuations in the data. Signal-to-noise ratio determines the limit of quantification for a particular test method. This is important when testing for restricted substances where the permitted levels are very low.

Statistical smoothing techniques can sometimes improve the appearance of the data.

Result Confidence

High ratios lead to more reproducible results across different laboratories and different days. Signal-to-noise ratio is a standard parameter in the validation of any new analytical procedure for plastics.