ONE IMAGE FIBRESCOPIC FRINGE PROJECTION WITH INVERSE APPROACH
Christoph Ohrt, Andreas Pösch, Markus Kästner, Eduard Reithmeier
Abstract:
Fringe projection offers a great variety of application fields in geometry measurement of free form elements. From large measuring areas down to geometry elements with sizes in the millimeter range it can be used for fast areal measurements. With advanced deviation analyses methods errors in fabrication lines can be found promptly after their appearance which can minimize rejections. However, there are still fields that cannot be covered by classical fringe projection. One of these fields is the measurement of filigree form elements on narrow or internal carrier geometries. To overcome this drawback, a fibrescopic micro fringe projection sensor was developed. The new device is capable of resolutions of less than 15 µm with uncertainties of about 35 µm in a workspace of 3 × 3 × 3 mm³.
The measuring time of the system is not sufficient for in-situ measurements, meaning measuring times of < 1 sec. The following work will introduce a new approach of applying a new one image measuring method to the fibrescopic system, based on inverse fringe projection [2]. The design of the fibrescopic fringe projection system with a laser lightsource, a digital micro-mirror device (DMD), fibre in- and uutCoupling optics and fibre optical image bundles (FOIB) creates high demands on the on the pattern generation and the involved ray tracing simulations to adapt an exact inverse image of a given CAD model. Approaches of the simulations in the context of the complex beam path, together the drawbacks of the limited resolutions of the FOIBs shall be discussed.
Keywords:
inverse fringe projection, fibrescopy, endoscopy, sheet bulk metal forming
Download:
IMEKO-TC14-2013-31.pdf
DOI:
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Event details
IMEKO TC:
TC14
Event name:
TC14 ISMQC 2013
Title:

11th International Symposium on Measurement and Quality Control

Place:
Cracow and Kielce, POLAND
Time:
11 September 2013 - 13 September 2013
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