Zero Path Difference

Views Updated: Dec 15, 2025

Abbreviation

ZPD

Pronunciation

/ˈziroʊ pæθ ˈdɪfərəns/

A new zero optical path difference ( OPD ) point positioning technique using diode lasers is proposed in this poper.
In order to study the application of modern interfering technology, the method for measuring the zero light path difference in white light interfering in the application of absolute length or displacement measurement is given in this paper.
The method for measuring the position with zero light path difference of two beams of wide band light is given.
The weight center method is used to define the position with maximum modulation of fringes, which is also the position with zero light path difference.
The point with zero optical path difference is accurately determined by Gaussian function curve fitting and this greatly improves the positioning accuracy of quasi-white light interference signal.

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