Autocallimator, Visual, Basic
Wednesday, August 30, 2006
All Autocollimators are based on the following operating principle. A reticule pattern at the focal plane of an objective lens of an optical system is projected forward illuminating a reflecting surface (usually a front surface mirror). The target mirror reflects all or part of the projected image back to the Autocollimator objective lens. The objective lens focuses the reflected returning light beam on to the objective lens focal plane containing the reticule pattern. The motion of the reflected returning reticule image is compared to the reticule pattern itself. There are several methods used for detecting the motion between the reticule pattern and the reflected returning reticule image.
With a Visual Autocollimator, an operator looks through an eyepiece to observe the reticule pattern and the reticule image. A Visual Autocollimator allows the operator to measure the angle between the reticule pattern and the reticule image on a measuring reticule. Final measurement accuracy depends on the visual acuity of the operator(s) vision capabilities and dexterity.
Key Ground Rules of the Visual Autocollimator are as follows:
(1) Do not depend on a single operator; (2) Always take multiple readings for each setting.
Key Advantages of the Visual Autocollimator are as follows:
(1) The ability of the human eye to work with a number of reflected returning reticule images on a single reticule image plane; (2) the visual autocollimator is a two-axis measuring device by design configuration.
Source: “Optical Alignment”, by Thomas H. Thurston, SPIE Proceedings, Volume 251, 1980
Reference: None Available.
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posted by JD52 @ 8:13 PM,
