ISO 3868:1976 PDF

Name: ISO 3868:1976 — Metallic and other non-organic coatings — Measurement of coating thicknesses — Fizeau multiple-beam interferometry method
SKU: ISO 3868:1976
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Metallic and other non-organic coatings — Measurement of coating thicknesses — Fizeau multiple-beam interferometry method

Название (английский):

ISO 3868:1976

Metallic and other non-organic coatings — Measurement of coating thicknesses — Fizeau multiple-beam interferometry method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 4
Дата публикации:: 1 ноября 1976 г.
Издание:: ISO IS 3868 edition 1 version 1
ICS:: 25.220.20

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Цена:60 €

Описание (английский):

Specifies a method for the measurement of the thickness of thin, highly reflective coatings (up to 2 ) by the use of Fizeau muliple-beam interferometry. The method described cannot be applied to vitreous enamel coatings. Gives principle, definitions, equipment, factors affecting in the measuring accuracy, calibration, procedure and measuring precision.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 3868:1976 defines a precise measurement method for the thickness of thin metallic and other non-organic coatings using Fizeau multiple-beam interferometry. This international standard targets coatings up to 2 micrometers thick, emphasizing highly reflective surfaces. It excludes vitreous enamel coatings from its scope. The method relies on optical interferometry, measuring the vertical displacement at a step formed between coating and substrate to determine thickness with high accuracy. Key components include monochromatic light, a Fizeau plate, and a filar micrometer eyepiece.

Key Topics

Measurement Principle The method creates a step by dissolving or masking part of the coating, then uses an interferometer to observe fringe patterns formed by reflections between the specimen surface and a reference plate. Changes in fringe spacing and offsets correlate directly to coating thickness.

Equipment Requirements Essential equipment includes a monochromatic light source, optics to direct light through a specially coated Fizeau plate, and a low-power microscope with an adjustable filar micrometer eyepiece to analyze interference fringes.

Factors Affecting Accuracy Accuracy depends on several critical factors:

Reflective overcoat application to minimize phase shift errors
Proper step formation with minimal abruptness to follow fringes easily
Surface flatness and smoothness to ensure sharp and well-defined fringes
Cleanliness to avoid contamination artifacts
Calibration with alternative methods for verification

Step Preparation Procedures Step edges can be created either by masking before plating or by dissolving the coating after deposition. The step must be well-defined and slope gently to allow clear fringe tracking with minimal disturbance.

Measurement Procedure The procedure involves adjusting specimen position, Fizeau plate tilt, focus, and lighting conditions to obtain a clear fringe line pattern. Thickness is calculated from fringe displacement using the wavelength of incident light and observed fringe shifts.

Measuring Precision The method ensures highly precise thickness measurements, with an accuracy of ±0.001 µm for coatings between 0.002 and 0.01 µm, and ±0.003 µm for thicker coatings up to 2 µm.

Applications

Thin Film Thickness Measurement Ideal for characterizing metallic and other non-organic coating thicknesses in industries where coatings are extremely thin and reflective.

Quality Control in Plating Processes Enables precise thickness verification for electroplated or vacuum-deposited metallic coatings to ensure compliance with design requirements.

Surface Engineering and Material Science Used in research and development to analyze coating uniformity and deposition processes on substrates.

Calibration and Instrument Validation Acts as a standard method to validate optical thickness measurement instruments by providing a traceable reference value.

Related Standards

ISO/TC 107 - Metallic and Other Non-organic Coatings ISO 3868 is part of a series of standards managed by ISO Technical Committee 107 focusing on coating properties and measurement techniques.

Interferometry Standards Complementary standards covering other interferometric methods such as white-light and two-beam interferometry provide alternative means of coating thickness measurement.

Surface Roughness and Preparation Standards Standards that define surface preparation techniques support consistent measurement outcomes according to ISO 3868.

Key Keywords: ISO 3868, Fizeau multiple-beam interferometry, coating thickness measurement, metallic coatings, non-organic coatings, thin film measurement, optical interferometry, filar micrometer, reflective coatings, step preparation, measurement accuracy, surface flatness, international coating standards.

ISO 3868:1976 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

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