公开(公告)号：US20180306575A1

公开(公告)日：2018-10-25

申请号：US15959333

申请日：2018-04-23

Applicant: APRE INSTRUMENTS, LLC

Inventor： ARTUR OLSZAK

IPC: G01B11/24 ,  G01J9/02 ,  G01B9/02

Abstract: The ROC value of a test surface is measured with a single spectrally-controlled interferometric measurement using a reference source of known ROC. The test surface is placed at the confocal position of the reference surface and the light source is modulated so as to produce localized interference fringes at the location of the test surface. The interference fringes are then processed with conventional interferometric analysis tools to establish the exact position of the test surface in relation to the reference surface, thereby determining the distance between the test surface and the reference surface. The radius of curvature of the test surface is obtained simply by subtracting such distance from the known radius of curvature of the reference surface.

公开(公告)号：US20180149468A1

公开(公告)日：2018-05-31

申请号：US15825219

申请日：2017-11-29

Applicant: APRE INSTRUMENTS, LLC

Inventor： ARTUR OLSZAK

IPC: G01B9/04 ,  G01B9/02 ,  G01B11/25 ,  G01J9/02

CPC classification number: G01B9/04 ,  G01B9/02003 ,  G01B9/02004 ,  G01B9/02007 ,  G01B9/02057 ,  G01B9/0209 ,  G01B11/2527 ,  G01B2290/35 ,  G01J9/02 ,  G01J2009/0292

Abstract: Heterodyne spectrally controlled interferometry is performed by combining a delay line in Twyman-Green configuration with a Fizeau interferometer. By splitting a white-light beam in the delay line and introducing a time delay in one of the resulting beams, the delay line produces a recombined output beam with a sinusoidally modulated spectrum. By introducing a frequency shift in one of the beams in the delay line, the output beam is also continuously phase shifted in the spectral domain in a time-varying fashion, as required for heterodyne SCI.