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This paper presents a novel principle for contactless gauge block measurement using a combination of low-coherence
interferometry and laser interferometry. The experimental setup combines a Dowell interferometer and a Michelson
interferometer to ensure a gauge block length determination with direct traceability to the primary length standard. This...
Context in source publication
Context 1
... the measured gauge block length is equal to the sum of distances between the measuring positions P2' and P3' of the reference position P1'. Figure 2 shows a sketch of a screenshot recorded by the CCD camera. There are two interference areas-the beams in the area no. 1 interfere in reference surface positions P2' and P3' and in the area no. 2, the beams interfere in reference surface position P1'. ...
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Citations
... The optical setup combines a Michelson interferometer and a Dowell interferometer [12], placed in the reference arm of the Michelson interferometer. The principle of the measurement is illustrated in Figure 1 and described in detail in [9,13]. A parallel beam, generated by a broad-band (e.g., white-light) source, is divided into two parts by semireflecting mirror M1. ...
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.
