Large-mirror testing facility at the National Optical Astronomy Observatories.

Details Large-mirror testing facility at the National Optical Astronomy Observatories. Large-mirror testing facility at the National Optical Astronomy Observatories.

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991opten..30.1405b&link_type=abstract

Opt. Eng., Vol. 30, No. 9, p. 1405 - 1414

Computer Science

16

Scientific paper

A method for testing the surfaces of large mirrors has been developed to be used even when conditions of vibration and thermal turbulence in the light path cannot be eliminated. The full aperture of the mirror under test is examined by means of a scatterplate interferometer that has the property of being a quasi-common-path method, although any means for obtaining interference fringes will do. The method uses a remotely operated CCD camera system to record the fringe pattern from the workpiece. The typical test is done with a camera exposure of about a millisecond to "freeze" the fringe pattern on the detector. Averaging up to 10 separate exposures effectively eliminates the turbulence effects. The method described provides the optician with complete numerical information and visual plots for the surface under test and the diffracted image the method will produce, all within a few minutes, to an accuracy of 0.01 μm measured peak-to-valley.

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