Statistics – Applications
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976nropt...7...63r&link_type=abstract
Nouvelle Revue d'Optique, vol. 7, Jan.-Feb. 1976, p. 63-68. In French.
Statistics
Applications
1
Instrument Errors, Interferometry, Optical Correction Procedure, Refracting Telescopes, Solar Instruments, Bending, Diffraction Patterns, Laser Applications, Mechanical Properties, Plastic Deformation, Pointing Control Systems, Structural Strain, Thermal Stability
Scientific paper
An interferometric method which permits the precise measurement of the instantaneous mechanical deformation of a telescope as a function of any parameter (weight, vibration, heating, etc.) is described. Two small mirrors fixed at the telescope aperture are illuminated by a laser from the focus of the instrument, and the resulting interference fringes are observed microscopically. Mechanical deformation of the instrument results in a motion of the fringes in the plane of observation. The technique has been used to measure the flexure of the Nice Coude telescope. The thermal stabilization time was found to be about 20 min. A continuous deformation as a function of the hour angle, corresponding to fringe motion at about 1 arc sec/min, was observed.
Aime Claude
Fossat Eric
Ricort Gilbert
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