Boris Katz, Liron Anavy, Irina Telent
EVALUATION OF FUNCTIONAL PARAMETERS MEASUREMENT’S ACCURACY FOR A "LEMON"/"BARREL" SHAPED BODY

These article sums our calculations and experiments of "lemon"/"barrel" shaped bodies; we’ve analyzed 4 methods for the measurements of the important parameters and calculated the uncertainty of each method.

Sonko Osawa, Toshiyuki Takatsuji, Tomizo Kurosawa
STEP-GAUGE CALIBRATION USING AN INTERFEROMETRIC COORDINATE MEASURING MACHINE AND THE UNCERTAINTY

There are many kinds of geometrical gauges used for calibration of machine tools and coordinate measuring machines (CMMs). A step-gauge is a kind of calibration gauge. It consists of many short gauge blocks and a base bar. Gauge blocks were directly calibrated by an interferometer using method of exact fraction. The method, however, does not apply to the calibration of step-gauges because of their complicated structure. The calibration works are very important missions in national metrology institutes (NMIs). We developed the step-gauge calibration system that consisted of a CMM and an interferometer. We describe the system scheme of a step-gauge calibration system using a conventional CMM combined with an interferometer and the evaluation of the measurement uncertainty. The uncertainty in measurement using this system is about 0.5 µm (k = 2) for 1-meter measurement.

Jae-Hwa Hong, Jeong-Mok Kim, Eun-Do Kim, Gi-Deok Park, Kyu-Sam Hwang, Soon-Ju Kwon
ON-LINE PHASE AND ALLOYING DEGREE MEASUREMENT SYSTEM FOR GALVANNEALED COATINGS

An on-line measurement system for phase fraction and alloying degree of galvannealed steel has been developed using an X-ray diffraction method. Intensities of diffraction peaks of Γ, δ, ζ and η iron-zinc phases were utilized for the determination of each phase fraction and alloying degree. Calibration curves were constructed using laboratory prepared standard reference samples and multiple regression technique. The system has been employed in POSCO’s galvannealing line at Kwang Yang Works for process monitoring.

Dirk Stöbener, Matko Dijkman, Dennis Kruse, Holger Surm, Olaf Keßler, Peter Mayr, Gert Goch
DISTANCE MEASUREMENTS WITH LASER-TRIANGULATION IN HOT ENVIRONMENTS

Tactile distance measurement systems with uncertainties in the micrometer range cannot be used in hot environments with temperatures above 800°C. A green laser-triangulation system with appropriate optical filters can meet these requirements. A measuring system was build up and tested at room temperature and in two different heat treatment furnaces at temperatures up to 900°C. Good linearity of the system and acceptable correspondence between measurements and published reference values could be observed. The results show the suitability of the system for distortion measurements in heat treatment furnaces.

T. Watanabe, H. Fujimoto, K. Nakayama, M. Kajitani, T. Masuda
CALIBRATION OF A POLYGON MIRROR BY THE ROTARY ENCODER CALIBRATION SYSYTEM

In this paper, we propose the new calibration measurement method of a polygon mirror. The measuring method of the conventional polygon mirror that uses an index table needs much technical skill, much time, and the amount of work. We used the Equal-Division- Averaged (EDA) method and have already developed the self-calibration system that calibrates the angle graduation signal of two sets of rotary encoders simultaneously. By combining this system and a polygon mirror, it becomes possible to measure the angle between faces of a polygon mirror. Now, in Japan, the angle traceability system which used the rotary encoder as the base of angle measurement device is established. If this technology is applied and a polygon mirror can be measured, it will make it easy to build a polygon mirror into the same traceability system.