Compact roll angle sensor device and measurement method

Abstract

The invention belongs to the field of photoelectric detection and measurement, and specifically discloses a compact roll angle sensor device and a measurement method. The device includes a linearly polarized light generation module, a sensing module and an integrated detection module; the linearly polarized light generation module includes a laser and a linear polarizer; the sensing module includes a wave plate, and the wave plate and a to-be-measured rotating element are in connection and synchronous rotation; and the integrated detection module includes a circularly polarized beam splittingsuper lens and a light intensity detector. The method performs measurement by adopting the device; and the method includes polarizing collimated monochromatic light emitted by the laser to linearly polarized light through the linear polarizer; modulating the linearly polarized light to elliptically polarized light through the wave plate; vertically irradiating the elliptically polarized light to the circularly polarized beam splitting super lens; obtaining left-handed circular polarization converging light and right-handed circular polarization converging light through polarization separationand convergence; and converging the left-handed and right-handed circular polarization converging light to two different points on the photosensitive surface of the detector, and measuring the light intensity through the detector. The device has advantages of large measurement range, high measurement precision, small overall volume and simple light path.

Description

technical field [0001] The invention belongs to the field of photoelectric detection and measurement, and more specifically relates to a compact roll angle sensor device and a measurement method. Background technique [0002] Roll angle, as one of the six degrees of freedom, is the angular displacement of an object's rotation about its longitudinal axis. Combined with the other five degrees of freedom (including two rotational displacements and three translational displacements), the position of an object in three-dimensional space can be fully determined. Therefore, the roll angle can directly affect the motion performance of the robot and the product quality of computer-aided manufacturing. Besides that, the roll angle also plays an important role in other applications, such as space docking of flying objects and Abbe error correction, etc. Given the important role of roll angle in many fields, it is necessary to measure and control it accurately and reliably. [0003] ...

AI Technical Summary

Problems solved by technology

The roll angle measurement devices involved in the above methods are all composed of multiple individual elements, which directly results in complex system optical paths and large device volumes, thus limiting the application of these roll angle measurement devices in some space-constrained situations

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