Thin Film Colorimetric Interferometry

Hartl, Martin; Křupka, Ivan; Poliščuk, Radek; Liška, Marek; Molimard, Jérôme; Querry, Michel; Vergne, Philippe

doi:10.1080/10402000108982458

Cited by 170 publications

(96 citation statements)

References 14 publications

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“…The film thickness calculation from the interferograms is based on colorimetric analysis using color matching algorithm and CIELAB color film thickness calibration. The details of experimental method are described elsewhere [20].…”

Section: Grease Samplesmentioning

confidence: 99%

Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces

et al. 2017

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The lubricant film thickness behaviors of lithium (Li) thickener type greases and their base oil were investigated for the contact between a glass disk and a smooth/dented steel ball using an optical interferometry. The main focus is to understand grease film behaviors including high speed history and contact surface conditions. A Li stearate thickened grease showed similar behaviors to the base oil itself and the thickener particles were not observed on the contact. Thickener particle entrainments were observed in greases with Li 12-hydroxy stearate and Li complex thickeners. Track patterns formed in the downstream of the contacts correlated with the thickener particle entrainments to the contacts. The Li stearate thickened grease showed quick starvation phenomenon without a scoop which maintains fully flooded conditions. The particle entrainments of Li 12-hydroxy stearate and Li complex thickened greases were less observed after measurements at high speeds. On the dented surfaces, the particle entrainments of the Li 12-hydroxy stearate grease were more frequent than those of Li complex grease. These results suggest that thickener chemical structures have influence on the grease film formation. The thickener with higher polarity could promote the entrainment of greases into contact.

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Section: Grease Samplesmentioning

confidence: 99%

Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces

et al. 2017

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“…Hartl [18] presented and confirmed the accuracy of optical interferometry that achieves 1nm for measuring thickness in the contact. This measuring method is sufficiently accurate so it was not necessary to verify the correct operation of measuring method itself.…”

Section: Discussionmentioning

confidence: 90%

Experimental Comparison of the Behavior between Base Oil and Grease Starvation Based on Inlet Film Thickness

Kostal¹,

Šperka²,

Křupka³

et al. 2017

Tribol. Ind.

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“…They obtained a three-dimensional distribution of the EHL film in a range of 60-800 nm with high resolution and accuracy [6]. This colorimetric interferometry used by the same group allowed the study of ultra-thin lubrication films down to 1 nm [7]. The technique, based on monochromatic interferometry, also had a low minimum measurable thickness and high resolution.…”

Section: Introductionmentioning

confidence: 99%

Optical analysis of ball-on-ring mode test rig for oil film thickness measurement

et al. 2016

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There are few experimental results available on film thickness at speeds above 5 m/s and they are almost all based on the optical ball-on-disc test rig. In contrast to the contacts in a rolling bearing, in which the lubricant in the oil reservoir distributes symmetrically, ball-on-disc contact shows asymmetry of lubricant distribution due to centrifugal effects. In order to closely imitate the contact occurring between the ball and the outer ring of a ball bearing, this study proposes an experimental model based on ball-on-glass ring contact. An optical matrix method is used to analyze the optical system, which is composed of a steel ball-lubricant-chromium-coated glass ring. Based on the optical analysis, the measurement system is improved in order to obtain a high quality interference image, which makes it possible to measure the film thickness at high-speeds conditions.

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Thin Film Colorimetric Interferometry

Cited by 170 publications

References 14 publications

Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces

Influence of Li Grease Thickener Types on Film Thicknesses Formed between Smooth and Dented Surfaces

Experimental Comparison of the Behavior between Base Oil and Grease Starvation Based on Inlet Film Thickness

Optical analysis of ball-on-ring mode test rig for oil film thickness measurement

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