NLS-Glossary

A subset of the full ASCII character set that is used in Code 128 and its variants. A symbol can switch between code sets by using control or flag characters.                                

is a very compact and versatile language which allows the encodation of the entire 128 ASCII character set. This symbology is self-checking and is designed with geometric features to improve scanner read performance.

is the spatial distance over which any two points P and Q on a waveform at a given instant can be correlated, one can be predicted from the other. Suppose that a wave train has a coherence time ∆t then its coherence length l = c∆t.

is the longest time period over which any two points P and Q at a given location can be correlated, one can be predicted from the other. When a sine wave is chopped, truncated, so that it exists only over the time period $∆t$ then it is not a perfect sine wave and contains a distribution of frequencies. The spectral width $∆v$ and the temporal coherence $∆t$ are related by $∆v=\frac{1}{∆t}$ .

(or light) consists of waves that have the same wavelength and always have the same phase difference with respect to each other at all times.                                                        

A optional block of color that can be placed along one or more sides of the Data Matrix portion of a 2D-Pharmacode symbol. Color fields are used to check for the presence of certain colors on pharmaceutical packaging (such as red warning labels).