Developed Method to Evaluate Some Optical Parameters in Gauge Block Measurements Using Ellipsometry

Abdallah, A. W.; Abdel‐Wahab, May; El-Bahrawy, M.

doi:10.1007/s12647-021-00521-6

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…It was achieved by measuring the ellipsometric parameters Δ, Ψ, which indicated the phase and amplitude shift in the light beam after it had been reflected from the surface of the test item [22]. These factors were needed to calculate the object's optical constants, such as the refractive index 𝑛 and extinction coefficient 𝑘 [23].…”

Section: Optical Test Methodsmentioning

confidence: 99%

Evaluation of new designed reference blocks for calibration and NDT by optical and ultrasonic techniques

Barakat,

Abdelwahab,

Abdallah

2022

Metrology and Measurement Systems

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Reference blocks are required for ultrasonic calibration and non-destructive testing (NDT). There are already in existence sets of reference blocks constructed according to American Society for Testing and Materials standards, but as the industry evolves, we need more reference blocks with varied designs. In this study, two reference blocks of steel and aluminum are constructed. These blocks have several sets of flat bottom holes (FBH) with different diameters (0.5, 1, 1.5, 2 and 2.5 mm), angles (45 • and 90 • ) and placements. The novel constructed reference blocks are evaluated using the ultrasonic and a displacement measuring interferometer (DMI). They allow for detailed FBH characterization in terms of defining their location, diameter, depth and so on. The two techniques show consistency in the majority of the outcomes. The expanded uncertainty of readings is found to be ±1.4 μm, according to DMI data. The findings show that the newly constructed blocks could be ideal for evaluating a variety of calibration factors including transducer sensitivity, dead zone, defect size, and depth. Furthermore, they can be used in NDT in various industries such as petroleum pipe production, steel manufacturing and so on.

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Section: Optical Test Methodsmentioning

confidence: 99%

Evaluation of new designed reference blocks for calibration and NDT by optical and ultrasonic techniques

Barakat,

Abdelwahab,

Abdallah

2022

Metrology and Measurement Systems

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“…The optical constants of the alloy specimens mixed with different mercury contents were determined by adjusting the ellipsometer software at wavelengths from 300 nm to 1000 nm and at a fixed angle of incidence of 75° [33]. The optical constants n, k of the alloy specimens is shown in Figure 14 (a and b).…”

Section: The Optical Constants Measurementsmentioning

confidence: 99%

Ultrasonic and Optical Investigation of Mercury Content Influence on Metrological Properties of Reference Alloy Materials

2023

Journal of Measurement Science and Applications (JMSA)

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Alloys are a mixture of pure metals. They had to be checked for their quality, production, and performance repeatability according to a standard. Thus, reference material may be obtained. The key novelty of this work is the preparation of a reference non-ferrous alloy material according to standards. It has great importance in the restorative materials. In addition, a novel ultrasonic technique was developed. Poly-methyl-methacrylate delay line was designed to modify the used ultrasonic transducers. Alloy powder of platinum modified non-gamma 2 mixed with different mercury percentages (0.5%, 1%, 1.5%, 2%, 2.5% and 3% weight by weight) at room temperature. According to standards, ultrasonic and optical measurements studied the influence of different levels of mercury in the alloy specimens. Ultrasonic velocities and attenuation measurements were carried out using the pulse echo technique. Ultrasonic velocities served to calculate the elastic properties, then to determine the mechanical behavior of the mixed alloy. Ultrasonic attenuation revealed the microstructure change of the mixed alloy. The number of crosslink density and the ultrasonic viscosity are measured. The changes in the optical constants, absorption coefficient, optical band gap, and Urbach energy were measured using the ellipsometric method. Results showed that the mercury content had a great influence on the mechanical properties and the microstructure of the alloys. In addition, 1, 1.5, and 2.5 % W/W mixed alloys were the most mixture that had homogeneous microstructure and could be used as reference restorative materials. The optimum one was the specimen with a mercury content of 2.5 %.

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Interferometric Imaging Ellipsometer for Characterizing the Physical Parameters of a Grown Oxide Layer

Abdallah

Farid

2022

MAPAN

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Interferometric and ellipsometric techniques are widely used in object characterization, investigation and testing. Both techniques are crucial for industrial sectors in manufacturing and production. In this work, an interferometric imaging ellipsometry method has been developed to measure the ellipsometric parameters Ψ, Δ and thickness t of native oxide layer formed on a copper thin film at wide angle of incidence 57.8–80.2º instantaneously. In this system, Michelson interferometer is illuminated with 45° polarized laser beam of 30 mm diameter. The produced fringes are split by a polarizing beam splitter (PBS) into p- and s- polarization fringes. The interferograms are captured separately by two CCD sensors at the reference and the measurement states without moving any parts in the optical system for each state. The detected p- and s- interferograms are analyzed using ImageJ software for mathematically calculating the values of Ψ, Δ and t of the oxide layer grown on copper thin film surface. The proposed method avoids the offset errors and the probable misalignment resulting from the beam and the optical components. In addition, it gathers the information of the interference pattern with the state of polarization of light for accurate, precise and real time contrast images. The oxide layer thickness is determined under controlled environment with high accuracy and low uncertainty. The results obtained by the proposed technique are consistent with the spectroscopic ellipsometer measurements.

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Developed Method to Evaluate Some Optical Parameters in Gauge Block Measurements Using Ellipsometry

Cited by 4 publications

References 19 publications

Evaluation of new designed reference blocks for calibration and NDT by optical and ultrasonic techniques

Evaluation of new designed reference blocks for calibration and NDT by optical and ultrasonic techniques

Ultrasonic and Optical Investigation of Mercury Content Influence on Metrological Properties of Reference Alloy Materials

Interferometric Imaging Ellipsometer for Characterizing the Physical Parameters of a Grown Oxide Layer

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