Abstract
This paper presents a method implemented in a system for automatic contactless calibration of gauge blocks designed at ISI ASCR. The system combines low-coherence interferometry and laser interferometry, where the first identifies the gauge block sides position and the second one measures the gauge block length itself. A crucial part of the system is the algorithm for gauge block alignment to the measuring beam which is able to compensate the gauge block lateral and longitudinal tilt up to 0.141 mrad. The algorithm is also important for the gauge block position monitoring during its length measurement.
Highlights
In the field of industrial metrology, a gauge block stands for a length standard [1]
The methods described there are based on using of mechanical length gauges or laser interferometry [2,3], but none of them is a full contactless method
P1 is at the mean optical path length of the ring interferometer and for the gauge block length measurement, it plays the role of the reference position
Summary
In the field of industrial metrology, a gauge block stands for a length standard [1]. Most contactless measuring techniques are based on a double-ended interferometry principle where different kind of lights (white, monochromatic, coherent) are used for detection of the gauge block length [4,5,6,7,8]. Most of these techniques are based on some changes of the optical setup (i.e., using shutters for disabling some beams) during the measuring process. This article describes the technique which was designed for our system for contactless gauge block length measurement
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