Details

Autor(en) / Beteiligte

• Yao, Yanfeng
• Wang, Yonghong
• Zheng, Zihua
• Wang, Biao
• Li, Junrui

Titel

High-performance digital shearography integrating spatial light modulator with micro-polarizer camera

Ist Teil von

• Optics and lasers in engineering, 2024-05, Vol.176, p.108077, Article 108077

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •The new digital shearography meets the requirements of high standards, making it suitable for dynamic tests while providing high-quality phase maps.•Both shearing direction and amount can be controlled quantitatively and accurately.•Phase maps can be evaluated with a single exposure.•High light efficiency and accurate phase demodulation lead to high-quality phase maps. Digital shearography (DS), a laser-based optical interferometric method, is widely employed for measuring the first-order derivative of an object's surface deformation. Unlike digital holography, DS integrates self-reference optics, enhancing resistance to environmental disturbance and improving detection sensitivity, making it ideal for non-destructive testing (NDT). DS finds applications in diverse fields such as material inspection, fluid property research, medical diagnostics, cultural heritage restoration, and military defense. The conventional temporal phase-shift (TPS) method encounters limitations in dynamic tests, leading to the introduction of the spatial phase-shift (SPS) method. However, SPS is restricted by aperture size, impacting the phase map quality. The spatial light modulator (SLM) introduces a novel approach to DS system development, enabling quantitative shearing adjustments through precise SLM control. Existing DS systems using traditional phase-shift technology rely on interferometers and struggle to achieve high-quality phase maps with a single exposure. The proposed high-performance DS, leveraging both SLM and a micro-polarizer camera, overcomes this limitation, facilitates single-exposure phase map evaluation with the polarization phase-shift technique, and eliminates the need for a tiny aperture, enhancing light beam utilization and phase map quality.