| US 7,616,327 B2 | ||
| Optical measuring device using optical triangulation | ||
| Jean-Luc Michelin, Bois Colombes (France) | ||
| Assigned to Sagem Defense Sécurité, Paris (France) | ||
| Appl. No. 11/909,069 PCT Filed Mar. 17, 2006, PCT No. PCT/FR2006/000601 § 371(c)(1), (2), (4) Date Sep. 18, 2007, PCT Pub. No. WO2006/097645, PCT Pub. Date Sep. 21, 2006. |
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| Claims priority of application No. 05 02729 (FR), filed on Mar. 18, 2005. | ||
| Prior Publication US 2009/0141290 A1, Jun. 04, 2009 | ||
| Int. Cl. G01B 11/14 (2006.01); G01J 1/00 (2006.01) | ||
| U.S. Cl. 356—623 [356/614; 356/121] | 9 Claims |
| 1. An optical measuring device using optical triangulation for measuring, relative to a plane reference surface (L) and in
a direction substantially perpendicular to said reference surface, the distance (d) and the inclination in two directions
of a surface (W) to be checked, which locally can be likened to a plane, and comprising:
light emitter means (8) suitable for emitting along the same path, with a given repetition frequency, two alternating light beams (FL, FW) in a first wavelength range (ΔλL) and in a second wavelength range (ΔλW), respectively;
beam divider means (9) suitable for generating, from each single incident beam (FL, FW), several separate parallel light beams (F′L, F′W), being at least three in number and distributed in a predetermined configuration;
an optical splitter (11) suitable for directing each of the incident light beams (F′L, F′W) in two different directions in relation to the two wavelength ranges (ΔλL, ΔλW) respectively, said optical splitter (11) being placed laterally relative to the reference surface (L) and to the surface (W) to be checked, so that the two output
beams (F′L, F′W) are directed, along paths of substantially the same length, into respectively the reference surface (L) and the surface
(W) to be checked, off which they undergo respective reflections (F″L, F″W) so as thereafter to converge on each other;
an optical beam combiner (12) suitable for collecting the two reflected beams (F″L, F″W) coming from the same incident beam and in directing them alternately along one and the same optical output path;
sensor means (14) for receiving each of said alternating output beams (F″L, F″W), said sensor means (14) comprising optronic sensors (15):
which are fewer than or the same in number as that of the multiple light beams,
which are placed in a configuration that is correlated with that of the multiple light beams in such a way that each optronic
sensor (15) receives alternately two light images (16L, 16W) formed by the two alternate reflected beams (F′L, F′W) respectively and
which are suitable for delivering (at 20) an output signal representative of the position of the energy barycenter of each
of the two light images (16L, 16W);
synchronization means (17, 18) for establishing a temporal relationship between the two alternate beams (FL, FW) emitted by the light emitter means (8) and the two images (16L, 16W) respectively formed on the optronic sensors (15); and
means (17) for processing all of the signals delivered by the optronic sensors (15) in order to provide information about the position and inclination of the surface (W) to be checked relative to the reference
surface (L).
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