| 摘要 |
A process and apparatus for the calibration of an optical instrument. An optical instrument-such as a lens meter or ophthalmometer-is provided with a light source, a light detector, and an optical train of assembled optical elements therebetween. A suspect optical element to be measured is placed within the optical train at a measuring interval to deflect light passing along the optical train. An occulting moving boundary locus having at least two boundaries of differing shape, and a dedicated computer may be used to measure beam deflection. The dedicated computer also makes use of stored computer constants to transform raw measurements into the desired optical properties of the suspect optical element. The optical train of the instrument has its assembled optical elements randomly placed to production tolerances; precision registration of the optical elements to traditional close optical tolerances is omitted. Calibration occurs by manipulating the instrument's beam deflection apparatus under the control of a calibration program, by providing the optical instrument being calibrated with an umbilical cord which bypasses the central processing unit of the dedicated computer, but otherwise manipulates the entire optical instrument's beam deflection apparatus. This umbilical cord leads from a calibration computer, which substitutes central processing and contained memory as well as providing a supplemental program for the generation of customized computer constants. Customized computer constants are generated for each instrument by insertion of a series of test elements of known quantity into the samping interval of that instrument, and burned into a memory which is then placed into the dedicated computer of the instrument being calibrated. |
