Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1978-08-14
1981-06-09
Corbin, John K.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
G01B 900
Patent
active
042721903
ABSTRACT:
Automatic test equipment for determining the optical properties of a test object is described. A highly collimated test beam of approximately one millimeter diameter is directed through the test object, is reflected, and passes through the test object a second time. The test beam source may be a laser and spatial filter, or equivalent. The reflected beam intensity and the exit point and return slope angle at which this beam leaves the test object are accurately measured to determine the optical characteristics of the test object. In one described embodiment, the exit point is determined by moving a knife edge to a point where half the light is blocked. The angle is determined by focusing the reflected beam and determining the position of the focal point, i.e. image height, by means of a pinhole mounted on a three axis micrometer platform. The light transmitted through the pinhole is detected by a light sensitive diode or equivalent. The entrance point of the test beam is determined by a mirror driven by a micrometer. A computer may be used to automatically drive all the micrometer scans and print out a numerical analysis of the optical properties of the test object. A second embodiment requires the test object to be located two focal lengths from an off-axis paraboloid mirror. A pinhole is located at the focal plane to determine the slope and a means for determining the beam position is located at the conjugate plane to measure the height of the exit beam. The second embodiment is more easily automated since the image height can be measured directly by any one of several electrical devices.
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Arnold Bruce Y.
Corbin John K.
Typalogics
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