GB/T 44268.3-2026Microscopes - Definition and measurement of illumination properties - Part 3: Incident light fluorescence microscopy with incoherent light sources (English PDF)

GB/T 44268.3-2026 is the English-translated version of 显微镜 照明特性的定义和测量 第3部分：使用非相干光源的入射光荧光显微术.

Fluorescence microscopy relies on a controlled and well-characterised illumination, and this document defines how illumination properties are described and measured for incident light fluorescence microscopy that uses incoherent light sources. It is Part 3 of the series on the definition and measurement of illumination properties for microscopes, and its focus on incoherent sources means lamp and LED based systems rather than lasers.

Microscope manufacturers can use it to characterise and report the performance of their illumination systems, while core facilities, research laboratories and imaging scientists may rely on it to compare instruments and to check that a system stays within its expected performance. Suppliers of light sources and filter sets are also potential users. It is a recommended national standard and adopts an international standard. It was issued on 28 August 2026 and takes effect on 1 March 2027.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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