High-speed Fizeau interferometry for film topography measurement during spray film interaction

Schumacher, Leif; Seel, Kevin; Reddemann, Manuel Armin; Kneer, Reinhold

doi:10.1063/1.5053591

Cited by 5 publications

(3 citation statements)

References 26 publications

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“…For this reason, the spatial resolution of the optical setup limits the maximum angle at which the fuel film can be inclined relative to the reference surface and still be detected. Schumacher et al 11 show that the maximum detectable angle, α max , can be expressed as:…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Taking this projected pixel size as an optimistic limit of minimum resolvable distance yields an estimated maximum film angle of 0.34° for the Michelson setup. The resolution of the imaging setup was improved for the subsequent Fizeau setup (based on findings from the Michelson tests) by using a three-piece combination of a 105 mm f/1.8 lens, a 20 × Mitutoyo APO, and a 50 mm Nikkor lens, similar to that of Schumacher et al 11 This produced a projected pixel size of 11.6 µm, which corresponds to an optimistic estimate of 0.96° for the maximum film angle.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The results demonstrated precise film thickness determination, but the time-domain approach is not capable of the temporal resolution necessary for GDI measurements. Schumacher et al 11 implemented a dual imaging interferometry approach to study impinging Diesel sprays in a constant volume spray chamber. That work included a Fizeau type spectral LCI measurement illuminated by a high-power xenon lamp.…”

Section: Introductionmentioning

confidence: 99%

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High-speed low-coherence interferometry of fuel films in impinging gasoline direct injection sprays

White

Manin

Pickett

2023

International Journal of Engine Research

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Quantitative experimental characterization of dynamic fuel film deposition processes is critical to developing better understanding and modeling of cold-start behavior in gasoline direct injection engines. Low-Coherence Interferometry (LCI) offers a quantitative fuel film thickness diagnostic that is immune or resistant to major confounding influences that limit other optical diagnostics in engine-relevant environments. This work describes an extension of spectral LCI techniques to high-speeds (10 kHz) that are capable of resolving the dynamics of fuel film deposition and evaporation in impinging gasoline sprays. Two approaches to LCI, Michelson interferometry and Fizeau interferometry, were tested and results demonstrate the superiority of the Fizeau configuration for enclosed vessel experiments. Experiments were performed at cold start conditions in an enclosed spray chamber with a gasoline spray impinging on a transparent wall. High-speed LCI was used to measure fuel film thicknesses and dynamic changes in thickness. The measurements were used to observe variation in film thickness and behavior with changes in system temperature and fuel composition.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-speed low-coherence interferometry of fuel films in impinging gasoline direct injection sprays

White

Manin

Pickett

2023

International Journal of Engine Research

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A systematic error modeling and separation method for the special cylindrical profile measurement based on 2-dimension laser displacement sensor

Zhang

Liu

Sun

et al. 2019

Review of Scientific Instruments

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The aim of this study is to improve aeroengine multistage rotor performance and to reduce the incidence of failures. Measuring the form error of seam allowance connecting cylindrical surface accurately is critical to achieve rotor optimal stack assembly stage-by-stage. In this paper, compared to the traditional cylindrical profile measurement model, a more comprehensive measurement model was built based on a 2-dimensional line laser sensor measurement technique, a model in which the component eccentricity error e, the sensor lateral offset error d, the sensor forward tilt error θx, the sensor lateral tilt error θy, and the rotary table tilt error γ were gradually modeled and separated. The particle swarm optimization algorithm was adopted to solve the model error parameters. The residual error simulation was performed to observe the effect of different levels of offset errors on the measurement results. The aeroengine rotor seam allowance surface measurement experiment was performed to verify the validity of the method model. We can conclude that the sensor lateral offset error d was 3.214 µm, sensor forward tilt error θx was 12.754″, sensor lateral tilt error θy was 10.365″, and rotary table tilt error γ was 2.146″. The cylindricity error value was 3.701 µm. Compared with the traditional cylindrical profile measurement method, the measurement accuracy of cylindricity error was improved by 1.768 µm. The proposed method can improve the measurement accuracy significantly of multistage rotors in the aeroengine measurement process; besides, it can also be extended to the measurement of other geometric form errors.

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Robust method to process nonuniform intensity holograms in digital holographic microscopy for nanoscale surface metrology

Narayan,

Pandey,

Vithin

et al. 2023

Appl. Opt.

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In this work, we propose a method based on nonlinear optimization to process holograms corrupted with nonuniform intensity fluctuations in digital holographic microscopy. Our method focuses on formulating an objective function from the recorded signal and subsequently minimizing it using a second-order optimization algorithm. We demonstrate the effectiveness of our method for phase extraction in the presence of severe noise and rapid intensity variations through extensive numerical simulations. Further, we validate the practical applicability of our method for nanoscale surface topography of standard test samples in digital holographic microscopy.

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High-speed Fizeau interferometry for film topography measurement during spray film interaction

Cited by 5 publications

References 26 publications

High-speed low-coherence interferometry of fuel films in impinging gasoline direct injection sprays

High-speed low-coherence interferometry of fuel films in impinging gasoline direct injection sprays

A systematic error modeling and separation method for the special cylindrical profile measurement based on 2-dimension laser displacement sensor

Robust method to process nonuniform intensity holograms in digital holographic microscopy for nanoscale surface metrology

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