قارن الطرق

	تشتت الضوء الديناميكي	صلادة فيكرز
المجال	علم المواد	علم المواد
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1964	1922
صاحب الطريقة	Robert Pecora	Smith and Sandland
النوع	Measurement method	Hardness test
المصدر التأسيسي	Pecora, R. (1964). Spectral distribution of scattered light from a suspension of particles. Physica, 30(11), 2055-2070.	Smith, E., & Sandland, G. E. (1922). An accurate method of determining the hardness of metals with particular reference to high-hardness alloys. The Institution of Steel Engineers, 8, 623-641.
الأسماء البديلة	DLS, photon correlation spectroscopy, particle size measurement	Vickers hardness test, Vickers microhardness, HV
ذات صلة	3	3
الملخص	Dynamic Light Scattering (DLS), also known as Photon Correlation Spectroscopy (PCS), is an analytical technique for determining the size and size distribution of particles suspended in fluids by analyzing the time-dependent intensity fluctuations of scattered laser light. Developed by Robert Pecora in 1964, DLS exploits the Brownian motion of particles: smaller particles move faster, causing faster intensity fluctuations; larger particles move slower, causing slower fluctuations. By correlating intensity over time, particle size is deduced. DLS is rapid, non-destructive, and requires minimal sample volume, making it the standard technique for characterizing nanoparticles, proteins, colloids, and emulsions.	Vickers Hardness testing is a mechanical characterization technique for determining material hardness by pressing a diamond pyramid indenter into a material surface under controlled load and measuring the resulting indent dimensions. Invented by Smith and Sandland in 1922, Vickers hardness is applicable across an enormous hardness range (1-2000 HV) using the same indenter geometry at different loads. It is the most versatile hardness test, widely used in materials science, metallurgy, and quality control for assessing material strength and comparing alloy performance.