Grating-Corner-Cube-Based Roll Angle Sensor

Abstract

This paper presents a specifically designed grating-corner-cube sensor for precise roll angle measurements. Owing to the diffraction characteristics of the transmission grating and reflection characteristics of the corner cube, two spatially separated parallel beams are naturally constructed. Through differential detection of the positions of two parallel beams, we experimentally demonstrate the possibility of a precise roll angle measurement at a high refresh rate. A performance evaluation of the proposed technique indicates a stability of 0.46 arcsec over 5 min. Compared with a commercial autocollimator over a range of 500 arcsec, the residuals are maintained within ±2 arcsec with a standard deviation of 1.37 arcsec. Furthermore, a resolution of 0.8 arcsec can be achieved using the proposed method. The developed compact roll angle sensor has potential applications in academic and industrial fields.

A Review: High-Precision Angle Measurement Technologies

“…On the one hand, large angle measurement generally involves the energy method, which changes the photoelectric energy at different angles. However, this simple energy utilization method has low accuracy [ 47 , 48 , 49 , 50 , 51 ] and relies on the stability and detection accuracy of the photoelectric itself [ 52 , 53 ]. On the other hand, phase-based methods allow for higher accuracy and better stability of measurements, e.g., calculating the angle change by monitoring the geometric length change of the light propagation [ 54 ] and laser self-mixing method [ 55 , 56 ].…”

An Ultracompact Angular Displacement Sensor Based on the Talbot Effect of Optical Microgratings

“…Real-time pitch angle measurements and orientation identifications are essential for applications such as the assembly of precision mechanical components, the position calibration of space probes and the positioning of machining platforms [ 1 , 2 , 3 ]. The recent interest in developing compact and energy-efficient mechatronic systems calls for an increasing interest in developing high-precision micro-angle sensors with ultracompact structures.…”