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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 9,
  • Issue 7,
  • pp. 071202-071202
  • (2011)

Interferometric measurement of injection nozzles using ultra-small f iber-optical probes

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Abstract

The measurement of boreholes with diameters smaller than 500 ?m is a demanding task that cannot be performed using state-of-the-art production metrology. In this letter, a miniaturized fiber probe with a diameter of 80 \mu m is presented. A probe is used for low-coherence interferometry to conduct highly precise measurements of form deviations of small boreholes. Measurements conducted in nozzles are also presented. The results prove the potential of the fiber-optical sensor for quality inspection of high-precision parts, such as injection nozzles, for common-rail diesel engines.

© 2011 Chinese Optics Letters

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