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ciducials
(Not to Scale) Collimator
□
Figure 1.—Target pattern (multicollimator,
multiexposure calibration plate).
exposures of banks of infinitely focused collimators of a
multicollimator are taken on a single photographic plate. An
exposure is taken at each of the preselected rotated camera
positions in the multicollimator camera mount. As a result of this,
a uniformly distributed pattern of collimator targets are imaged on
the calibration plate. In the test case, three rotated camera
positions, 0, +15 and -15 degrees, were used for multiple exposures.
Over 90 images of collimator targets were obtained by the three
exposures on the same photographic plate. (See fig. 1.) Statistical
r procedures were followed during the entire process of mensuration,
data reduction, and analysis. Optimum camera calibration results
were obtained using the method of least squares adjustment and
weighting technique in the solution of the generalized
photogrammetric problem. From the test results, the calibration
system proved to be a +/-2 to +/-3 micrometer accuracy system.
297
