Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1994-03-15
1995-08-29
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356363, G01B 902
Patent
active
054465451
ABSTRACT:
In a method of calibrating the measuring performance and apparatus for a machine, the conventional physical length bar is simulated by moving a retro-reflector to various positions along a track. A laser beam of an interferometer is aligned with the track using the retro-reflector at two extreme positions in order to define a measurement axis for the calibration. The retro-reflector has a part-spherical surface on its rear face which is centered on the nodal point of the retro-reflector. By contacting the reference surface with a probe on the machine at several points, the center of the sphere at the two positions of the retro-reflector can be calculated and hence the measurement axis is defined in the machine frame of reference. Measurements are taken with the interferometer of the position of the retro-reflector at several points on the measurement axis, and at each point the measuring probe is brought into contact with the spherical surface of retro-reflector (preferably at the intersection of the measurement axis and the surface) to make a second measurement of the retro-reflector's position. The accurate measurement of the interferometer is compared to the machine's measurement to determine the machine error. Many different length bars can be easily simulated by this method, and bars of different materials can be simulated by using the coefficient of linear expansion of commonly used materials to convert the measured distance into a length measurement of a bar of that material corrected to standard temperature and pressure.
REFERENCES:
patent: 3582211 (1969-10-01), McClure
patent: 4939678 (1990-07-01), Beckwith, Jr.
patent: 4950079 (1990-08-01), McMurtry et al.
patent: 5007006 (1991-04-01), Taylor et al.
Renishaw plc
Turner Samuel A.
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