Method and apparatus for measuring shape of objects
AssigneeLoughborough University Innovations Limited
InventorsJonathan Mark Huntley, Henrik Saldner
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Abstract
There is disclosed a method for measuring the shape of objects which might have surface discontinuities using projected fringes, in which method the pitch of the fringes is varied over time and a sequence of phase-stepped images is recorded from which a three-dimensional complex intensity is calculated and either the phase of the distribution is unwrapped along the time axis or the Fourier transform of the distribution is calculated along the time axis.
Claims24
A method for measuring the shape of objects which might have surface discontinuities using projected fringes, in which method the pitch of the fringes is varied over time and a sequence of phase-stepped images is recorded from which a three-dimensional complex intensity distribution is calculated.
Apparatus for measuring the shape of objects which might have surface discontinuities using projected fringes comprising fringe generating means projecting fringes on the object to be measured, phase stepping means to vary the phase of the fringes and fringe pitch varying means adapted to vary the pitch of the generated fringes over time, recording means adapted to record a sequence of phase-stepped images and computing means programmed to calculate a three-dimensional complex intensity distribution.
Dependencies are inferred from the claim text.