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Optical Engineering

Micro-optical distance sensor fabrication by deep x-ray lithography
Author(s): Hajime Nakajima; Patrick Ruther; Juergen Mohr; Masahiro Tsugai; Teruo Usami
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Paper Abstract

An all optical ultraminiaturized sensor head for displacement measurement that has a size of less than 5 mm in square has been produced. The sensor works by means of optical triangulation. To achieve the optical function, the sensor consists of a three-layer polymer waveguide patterned by deep x-ray lithography (LIGA), a light input fiber, two detection fibers, and microcylindrical lenses, which are also fabricated by deep x-ray lithography. The fibers and the cylindrical lenses are placed into the waveguide without any active alignment by using the waveguide walls as guiding and fixing structures. The ratio of the intensities detected in the two detection fibers is the measure of the distance between the object and the sensor. High resolution of about 10 ?m is achieved in the range of 2 to 3 mm between the sensor and an object with a diffusively reflecting surface.

Paper Details

Date Published: 1 August 2001
PDF: 7 pages
Opt. Eng. 40(8) doi: 10.1117/1.1387987
Published in: Optical Engineering Volume 40, Issue 8
Show Author Affiliations
Hajime Nakajima
Patrick Ruther, Forschungszentrum Karlsruhe (Germany)
Juergen Mohr, Forschungszentrum Karlsruhe GmbH (Germany)
Masahiro Tsugai, Mitsubishi Electric Corp. (Japan)
Teruo Usami, Mitsubishi Electric Corp. (Japan)

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