ISO 19741:2025

Name: ISO 19741:2025 — Optics and photonics — Optical materials and components — Test method for striae in infrared optical materials
SKU: ISO 19741:2025
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Optics and photonics — Optical materials and components — Test method for striae in infrared optical materials

Название (английский):

ISO 19741:2025

Optics and photonics — Optical materials and components — Test method for striae in infrared optical materials

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 19 мая 2025 г.
Издание:: ISO IS 19741 edition 2 version 1
ICS:: 37.020

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Описание (английский):

This document specifies the principle, apparatus, condition, sample, procedure and data processing of measuring striae in infrared optical materials. It is applicable for the determination of striae in infrared optical materials, such as infrared optical glass, which is opaque to visible wavelengths and whose transmission optical spectra are beyond 0,78 µm.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 19741:2025 - "Optics and photonics - Optical materials and components - Test method for striae in infrared optical materials" defines a standardized laboratory method to detect, image and quantify striae (internal refractive-index inhomogeneities) in infrared optical materials such as infrared optical glass whose transmission begins beyond 0.78 µm. The standard describes the principle (projection and Schlieren imaging), required apparatus, environmental/test conditions, sample preparation, measurement procedures and data processing needed to produce repeatable, comparable striae measurements.

Key topics and requirements

Measurement principle: illumination with a collimated infrared source and imaging of striae using either a beam‑contracting projection system (projection measurement) or a camera with a knife‑edge device (Schlieren measurement).

Apparatus components:

Collimating infrared light source covering the sample transmission band; intensity non‑uniformity ≤ 5%.
Projection optical system (lens 1, lens 2) configurable as beam‑contracting telescope or camera with a movable lens and knife edge.
Image sensor with working spectrum within sample transmission and spatial resolution better than 0.25 mm.
Computer for image collection, processing and display; display contrast > 1000:1.
Standard grey level sample (uniform, ~50% transmittance) for sensor calibration.

Environmental/test conditions:

Temperature: 15 °C to 35 °C, tolerance ±2 °C.
Relative humidity < 80%.

Sample quality prerequisites:

Surface roughness Rq < 0.012 µm (per ISO 10110-8).
Scratches and digs limited (per ISO 10110-7).

Procedure highlights:

Instrument warm‑up and thermal soak of standard and test samples.
Calibration with the standard grey level sample.
Align sample centre, rotate to maximize visible striae area, collect images.

Data processing:

Measure individual striae regions (length/width → area), compute total striae area and area percentage of test region.
Determine grey level per region and calculate striae value (average grey level × area percentage per material thickness).

Applications

ISO 19741:2025 is used by:

Manufacturers of infrared optics and lenses for quality control and production acceptance.

Optical metrology and testing laboratories validating material homogeneity.

R&D teams and materials scientists characterizing IR glass and transmissive components.

Procurement and specifications teams that require objective striae limits for infrared optical components used in thermal imaging, sensing, aerospace and defense systems.

Related standards

ISO 10110-7 - Surface imperfections (scratches and digs)

ISO 10110-8 - Surface texture (surface roughness)

ISO 19741:2025 provides a repeatable, documented method for assessing striae in IR optical materials, supporting consistent quality control and specification compliance across the optics and photonics industry.

ISO 19741:2025

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications

Related standards

Технические детали

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