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A high Precision Time Grating Displacement Sensor Based on Temporal and Spatial Modulation of Light-Field.
Min Fu1, Changli Li1,2, Ge Zhu2
1Engineering Research Center of Mechanical Testing Technology and Equipment, Ministry of Education, Chongqing Key Laboratory of Time Grating Sensing and Advanced Testing Technology, Chongqing University of Technology, Chongqing, 400054, China.
Sensors (Basel, Switzerland)
|February 14, 2020
Summary
A novel time grating displacement sensor uses light-field modulation for high-precision measurements. This innovation reduces reliance on expensive manufacturing, achieving 0.64 μm accuracy with a low-cost, submillimeter sensing unit.
Area of Science:
- Optics and Photonics
- Metrology and Measurement Science
- Sensor Technology
Background:
- Traditional high-precision displacement measurements often require high-precision manufacturing, increasing costs.
- Existing sensor technologies may face limitations in accuracy, cost-effectiveness, or manufacturing demands.
Purpose of the Study:
- To develop a novel displacement sensor, termed time grating, that utilizes light-field modulation.
- To reduce the dependency on high-precision manufacturing processes for achieving accurate displacement measurements.
- To investigate and mitigate the impact of light-field distribution on sensor measurement errors.
Main Methods:
- Proposed a time grating sensor employing a light source to generate simultaneous, alternative light-fields across four sinusoidal transmission surfaces.
- Utilized orthogonally alternative light-fields to synthesize a traveling wave signal, correlating object movement with signal phase shift.
- Analyzed the influence of light-field distribution on measurement error and proposed an optimization method using continuous, spatially symmetrical cosinusoidal surfaces.
Main Results:
- The proposed optimization method, verified through simulations and experiments, effectively reduced measurement errors caused by light-field distribution.
- Experimental results demonstrated a measurement accuracy of 0.64 μm over a 500 mm range with a 0.6 mm pitch.
- The light-field time grating achieved high-precision displacement sensing with a cost-effective and submillimeter period sensing unit.
Conclusions:
- The light-field time grating sensor offers a viable solution for high-precision displacement measurement, overcoming limitations of traditional methods.
- The developed sensor technology enables accurate measurements without the need for high-precision manufacturing, making it more accessible.
- The study validates the effectiveness of light-field modulation and optimized surface design for advanced metrology applications.
