No abstract

No abstract

Two-Axis Rotation Systems, or "goniometers," are used in diverse applications including telescope pointing, automotive headlamp testing, and display testing. There are three basic configurations in which a goniometer can be built depending on the orientation and order of the stages. Each configuration has a governing set of equations which convert motion between the system "native" coordinates to other base systems, such as direction cosines, optical field angles, or spherical-polar coordinates. In their simplest form, these equations neglect errors present in real systems. In this paper, a statistical treatment of error source propagation is developed which uses only tolerance data, such as can be obtained from the system mechanical drawings prior to fabrication. It is shown that certain error sources are fully correctable, partially correctable, or uncorrectable, depending upon the goniometer configuration and zeroing technique. The system error budget can be described by a root-sum-of-squares technique with weighting factors describing the sensitivity of each error source. This paper tabulates weighting factors at 67% (k=1) and 95% (k=2) confidence for various levels of maximum travel for each goniometer configuration. As a practical example, this paper works through an error budget used for the procurement of a system at Sandia National Laboratories.

No abstract

Honeywell has developed and implemented a comprehensive intraplant and interplant colorimeter certification method with traceability to NIST standards for inspection of avionics LCDs. To perform effective interplant correlation of optical measurements, special‐purpose hardware was specified, designed, and built. Since the implementation of these procedures, increases in interplant correlation have helped to dramatically reduce the cycle time for LCD glass; and intraplant correlation has improved to the level where grouping in CIELuv space by colorimeters is no longer apparent.