Optics: measuring and testing – Lens or reflective image former testing – Optical center – cylinder axis – or prism measuring or...
Patent
1977-07-05
1980-01-08
Clark, Conrad J.
Optics: measuring and testing
Lens or reflective image former testing
Optical center, cylinder axis, or prism measuring or...
250233, G01B 900, G01D 536
Patent
active
041825721
ABSTRACT:
A unitary light source is imaged through a prism array to generate a plurality of preferably four apparent light sources forming a point of origin for a discrete lens sampling light path. From each apparent light source, each discrete sampling path diverges to a relay lens system. This relay lens system relays and registers to a lens sampling interval discrete images of each apparent light source. The images may be registered to a correspondingly apertured lens sampling diaphragm against which suspect optics are placed for measurement. A moving boundary locus sweeps the light between each apparent source and the sampling interval with paired boundaries of differing slopes which produce non-ambiguous points of intersection with respect to time. After passage through the suspect optics at the sampling interval, light is passed to a photodetector having an overlying set of apertures, each aperture corresponding to one of the four apparent light sources. A lens pair functions as relay optics to focus a conjugate image of the light at the suspect optics to the overlying apertures at the detector. Light other than that passing through the suspect optics at the point of the images of the apparent light source is excluded. Moreover, a sampling aperture in combination with one of the lenses of the relay pair, passes only that light with limited angularity substantially parallel to a selected optic path for each discrete light source. Light having an angularity other than the selected angularity is excluded from the conjugate image. Provision is made to fold the light paths to a C-shaped configuration to shield both extraneous light and electro-mechanical interferences from sensitive photodetector elements.
REFERENCES:
patent: 2640392 (1953-06-01), Freeman
patent: 2997699 (1961-08-01), Lovell
patent: 3446559 (1969-05-01), Astheimer et al.
patent: 3606548 (1971-09-01), Dyson
patent: 3614239 (1971-10-01), Kissell
patent: 3880525 (1975-08-01), Johnson
Clark Conrad J.
Humphrey Instruments Inc.
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