Loading patent…
AssigneeDelphi Technologies, Inc.
InventorsLAURENT TUPINIER, OLIVIER R. MARROUX, JOHANN MICHEL, PAUL-ANTOINE TRITSCHLER, MANDIAYE NDAO, BERNARD KRESS
Estimating the term…
Device for detection of out-of-round on an angle sensor including a disc supporting angle coding means rigidly attached to a rotating shaft and at least one fixed optical system including a coherent light source emitting a beam interfering with the angle coding means of the support disc in order to code its angular position, means for collimation of the said beam before interference and a photodetector of the modulated beam after interference. In accordance with one possibility, it includes two optical systems arranged 90° from each other. Alternatively, there is only one optical system and the disc includes a circular track radially centred in at least one of its angular positions relative to the incident collimated light beam, and a radially orientated photodetector.
A device for detection of out-of-round on an angle sensor including a disc supporting angle coding means rigidly attached to a rotating shaft and a fixed optical system including a coherent light source emitting a beam interfering with the angle coding means of the support disc in order to code its angular position, means for collimation of the said beam before interference and a photodetector of the modulated beam after interference, wherein the disc includes a circular track composed of coding cells with computer-generated two-dimensional diffraction holograms and generating on each cell an invariant angle code in a direction tangential to the displacement of the disc, and a radial code differing in accordance with the radial positioning of the light beam relative to the said track.
A device for detection of out-of-round on an angle sensor including a disc supporting angle coding means rigidly attached to a rotating shaft and a fixed optical system including a coherent light source emitting a beam interfering with the angle coding means of the support disc in order to code its angular position and a photodetector of the modulated beam after interference, wherein the disc includes coding cells uniformly spaced around its periphery and provided with identical diffraction holograms diffracting the incident light into a signal including spots orientated in a line, the said hologram including a modulation, in the form of a stripe or a plurality of identical stripes arranged in parallel, which modulates the diffracted signal by changing the orientation of the line of spots according to the relative position of the incident beam and the hologram, the said line always being perpendicular to the tangent to the stripe or stripes, the position of the centre of the diffraction spot of order 0 remaining unchanged, the said stripe or stripes being so orientated in the cells that a radial modification to the relative position of the incident light beam and the hologram modifies the orientation of the line of spots, a photodetector being so arranged as to correspond to the displacement of one of the diffraction spots, preferably of order greater than or equal to 1 absolute.
A device for detection of out-of-round on an angle sensor including a disc supporting angle coding means rigidly attached to a rotating shaft and a fixed optical system including a coherent light source emitting a beam interfering with the angle coding means of the support disc in order to code its angular position and a photodetector of the modulated beam after interference, wherein the disc includes coding cells uniformly spaced around its periphery and provided with gratings having stripes generating a spot the position of which on the photodetector is a function of the incident beam/coding cell relative position.
Dependencies are inferred from the claim text.