Remote laboratories for optical metrology: from the lab to the cloud

Wilke, Mathias; Pedrini, Giancarlo

doi:10.1117/12.981616

Cited by 4 publications

(3 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sparsity method that we have used is the Tamura of gradient (ToG) [29]. The Tamura coefficient of the complex image can be calculated using equation (5):…”

Section: Autofocusingmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of specular surfaces using electrically tunable lens in digital holography

Barak¹,

Kumari²,

Sheoran³

2022

J. Opt.

View full text Add to dashboard Cite

In the field of industrial metrology, the three-dimensional non-destructive imaging of reflecting metallic surfaces is a delicate task. In this work, we propose a novel application of Electrically Tunable Lens (ETL) in Digital Holography for imaging of specularly reflecting objects. The precise surface profile of microscopic step height at different axial depths is obtained by tuning the liquid lens at different currents. Initially, the ETL's focal length is set by tuning its control current to image the specular reflection observed from the surface of the reflecting sample. The current of ETL is tuned accordingly as the sample is moved to different z-positions. In order to demonstrate efficacy of the proposed setup, the object is kept at multiple axial distances within the depth of field (DOF) of the ETL. The step height measurements are done and measurement uncertainty of 0.083µm is calculated for step height measurements at different axial positions ranging from 2cm-21cm. The axial range of the setup is validated by keeping two specularly reflecting samples in the field of view of the ETL. The experimental results demonstrate ETL’s efficiency in a digital holographic system for accurately imaging specularly reflecting objects present at multiple axial depths. The setup is useful for precise step height measurements and for obtaining surface profiles of microstructures.

show abstract

“…The sparsity method that we have used is the Tamura of gradient (ToG) [29]. The Tamura coefficient of the complex image can be calculated using equation (5):…”

Section: Autofocusingmentioning

confidence: 99%

“…have been reported for the measurement of surfaces of diffuse objects [4,5]. However, the most challenging objects from the metrological perspective are specular surfaces that exhibit high reflectivity.…”

Section: Introductionmentioning

confidence: 99%

Measurement of specular surfaces using electrically tunable lens in digital holography

Barak¹,

Kumari²,

Sheoran³

2022

J. Opt.

View full text Add to dashboard Cite

show abstract

“…• e-Sharing: Shared use of expensive facilities by partners in collaborative projects (for instance, the cooperation between experts coming from different fields such as optical metrology and artwork conservation with the objective to create more efficient technologies for artwork restoration and inspection [45][46][47][48] ), • e-Comparison: remote master-sample comparison (see Sec. 8.1), • e-Assembling: measurement and digital joining of parts that are fabricated at different locations, but have to be joined at one place, 1,49 • e-Documenting and e-Publishing: a new way of documentation and publication by addition of real-world experiments to publications providing remote access to the metadata and to the experimental setup via the Internet, 50…”

Section: ) Includingmentioning

confidence: 99%