INTERFEROMETRIC MEASUREMENT OF INJECTION NOZZLES USING ULTRA-SMALL FIBER-OPTICAL PROBES

Tilo Pfeifer , Robert Schmitt , Niels König, Guilherme Francisco Mallmann

Abstract

The measurement of boreholes with diameters smaller than 500 microns is a demanding task, which cannot be coped with state-of-the-art production metrology. Within this paper, the set-up of a miniaturized fiber probe with a diameter of 80 microns is presented. The probe is used for low-coherence interferometry for the highly precise measurement of form deviations of small boreholes. Measurements, which have been conducted in nozzles, are presented. The results prove the potential of the fiber-optical sensor for the quality inspection of high-precision parts such as injection nozzles for common-rail diesel engines.

Keywords

roundness, fiber-optic sensor, low-coherence interferometry, miniaturization

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IMEKO-TC2-2010-04.doc

DOI

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IMEKO TC

TC2 - Photonics

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