Displacement Measurement Based on the Missing-Order Talbot Effect

Displacement measurement is a crucial application, with laser-based methods offering high precision and being well established in commercial settings. However, these methods often come with the drawbacks of significant size and exorbitant costs. We introduce a novel displacement measurement method t...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2025-01, Vol.25 (1), p.292
Main Authors: Song, Liuxing, Zhao, Kailun, Wang, Xiaoyong, He, Jinping, Tian, Guoliang, Yang, Shihua, Li, Yaning
Format: Article
Language:English
Subjects:
Detectors
displacement measurement
FFT
grating
Interferometry
Lasers
Light
Measurement
missing-order Talbot effect
Propagation
Talbot effect
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Summary:Displacement measurement is a crucial application, with laser-based methods offering high precision and being well established in commercial settings. However, these methods often come with the drawbacks of significant size and exorbitant costs. We introduce a novel displacement measurement method that utilizes the missing-order Talbot effect. This approach circumvents the need to measure contrast in the Talbot diffraction field, opting instead to leverage the displacement within the missing-order Talbot diffraction pattern. Our method only requires parallel light, an amplitude grating, and a detector to achieve displacement measurement. The measurement dynamic range can be adjusted by altering the grating period and the wavelength of the incident light. Through careful simulation and experimental validation, our method exhibits a correlation coefficient surpassing 0.999 across a 30 mm dynamic range and achieves a precision superior to 3 μm.
ISSN:1424-8220
1424-8220
DOI:10.3390/s25010292