Relocation -- A concept for dealing with measurement object expansion or contraction
Over the last decade, industrial metrology has experienced a tremendous improvement in measurement sensors. First, optical tooling was made obsolete by theodolite systems, which in turn are now being displaced by laser trackers. Furthermore, there are already first indications that laser trackers, as far as static measurements are concerned, will have to compete very hard with the next generation of motorized total stations. These technological advances have made it possible to measure even large objects with high resolution. Now, as it turns out, the factor limiting the achievable accuracy is not equipment related but is imposed by atmospheric effects. These effects are refraction, scintillation, and temperature related object expansion and contraction. Due to temperature changes, large objects, like an airplane's fuselage or wing, will significantly expand or contract during the course of a laser tracker or theodolite system measurement. Typical data analysis software does not model these changes and hence, will absorb them in the least squares process. This leads to inaccuracies in the individual target point coordinates and their corresponding standard deviations, as well as to a warping of the coordinate system. This paper will propose a method for dealing with measurement object expansion and contraction effects.
- Research Organization:
- Stanford Univ., Stanford Linear Accelerator Center, CA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 666189
- Report Number(s):
- SLAC-PUB-7414; CONF-9701112-; ON: DE98059101; TRN: US200305%%515
- Resource Relation:
- Conference: Boeing laser tracker workshop, Renton, WA (US), 01/14/1997--01/15/1997; Other Information: Supercedes report DE98059101; PBD: Feb 1997; PBD: 1 Feb 1997
- Country of Publication:
- United States
- Language:
- English
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