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1. US4840490 - Laser position measurement and alignment

Office États-Unis d'Amérique
Numéro de la demande 06902370
Date de la demande 30.09.1986
Numéro de publication 4840490
Date de publication 20.06.1989
Numéro de délivrance 4840490
Date de délivrance 20.06.1989
Type de publication A
CIB
G01B 11/27
GPHYSIQUE
01MÉTROLOGIE; TESTS
BMESURE DE LA LONGUEUR, DE L'ÉPAISSEUR OU DE DIMENSIONS LINÉAIRES ANALOGUES; MESURE DES ANGLES; MESURE DES SUPERFICIES; MESURE DES IRRÉGULARITÉS DES SURFACES OU CONTOURS
11Dispositions pour la mesure caractérisées par l'utilisation de moyens optiques
26pour mesurer des angles ou des cônes; pour tester l'alignement des axes
27pour tester l'alignement des axes
CPC
G01B 11/272
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
11Measuring arrangements characterised by the use of optical means
26for measuring angles or tapers; for testing the alignment of axes
27for testing the alignment of axes
272using photoelectric detection means
Déposants Lasercheck Limited
Inventeurs Gabriel David
Audus David
Strange Norman
Mandataires Sughrue, Mion, Zinn, Macpeak and Seas
Données relatives à la priorité 8431148 10.12.1984 GB
8510218 22.04.1985 GB
Titre
(EN) Laser position measurement and alignment
Abrégé
(EN)

A laser beam (22) is used as a spacial reference and its position is measured relative to a target device (200A, 200B, 200C) mounted on a structure (210) being monitored (FIG. 6). The target device has two edges or slots which are moved to intersect the beam such that the two intersections occur at right angles to one another at the beam for maximum accuracy. The edges may be fixed and are in such relation that one coordinate of beam position is a monotonic function of the displacement of the beam between positions at which one and the other edge intersect the beam. The other coordinate is obtained by the relative displacements for intersection of the beam from a reference position. In one embodiment (FIG. 2) the target (30) is moved linearly and the edges (40,42) are straight and mutually orthogonal. In another embodiment (FIG. 3) the target (100) is mounted for rotational displacement with arcuate intersecting edges (104, 106). It is shown how the ideal case for right-angle intersections can be reasonably approached by use of arcs of circles. In a modification of the rotational device, the two edges (324, 326) are made separately movable about a common axis (314) whereby they can be maintained adjacent the beam (222) to track beam movement (FIG. 9). Detection of intersection can be made remotely by a separate receiver (230) (FIG. 6) or by using light guides ( b 304,306)(FIG. 8) on the target edges, or reflective target edges (105,107,311)(FIG. 12,13) to separate detectors.

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