Image Analysis

Dynamic Imaging Particle Analysis

Most particle size measurement techniquesmethods are based on the assumption of spherical shaped particles. This hypothesis leads to significant errors in the analysis if the particles are flake or rod-shaped. Especially for such highly form-anisotropic particles, automated imaging provides an excellent alternative for the determination of tailor-made size specifications.

Automated imaging methods for the determination of the particle size distribution of a material offers a fundamental advantage over alternative methods such as static light scattering, sedimentation or sieving: Each particle is photographed individually! This results in several important advantages for the determination of the particle size distribution:

Realistic proportional values also at the edges of the size distribution, i. e. detection of oversized particles or fine particles

Visual assessment of the dispersing state of a sample (dispersing quality, presence of agglomerates)

Calculation of meaningful size parameters, e. g. geodetic length or Feret diameter for fibres, depending on the application

Selection of the appropriate distribution type (volume, number) depending on the particular task

In addition, the individual photography of the particles gives the opportunity to make statistical calculations on the particle shape, which in practice enables further differentiation of materials. For example, form anisotropy, the deviation of the particles from the ideal sphere, often plays a decisive role for their application and further processing – for example, the conveyance or compaction of powders, the influence on the rheology in dispersions or, in addition to the particle size distribution, the roughness of the particle surface plays an important role for the success of shaping or polishing.

The necessity for tailor-made particle size and shape parameters, combined with ever-increasing PC processing power, ensures that automated imaging methods are becoming increasingly more relevant to a market which is 95% non-spherical..

Measurement method

The determination of the particle shape by automated imaging includes 4 basic steps:

The image taking is ensured by special digital cameras, if necessary in combination to a microscope, to enlarge the particles. The particles may be present neutral (e.g. on an objective) or in motion as well. The dispersing (separation) of particles is possible both in dry-mode (e.g. by simple conveying and riddling or by the usage of compressed air) but also in wet-mode in a solvent. An absolutely basic requirement to perform a successful particle shape analysis is high resolution, image sharpness, good sample dispersing resulting in measurement of individual particles and suitable enlargement. More explanation of this expression required etc. Image processing by appropriate software leads to upgraded pictures: for example isolated pixels and edging particles are eliminated, variations in brightness and signal noise are retouched and agglomerated particles are separated. The main part in object detection is image binarization, whereby every image pixel is assigned to a particle (black) or the background (white) using a threshold. The recognition of objects (particles) and feature attribution is realized by the software. In the last step, the classification, the particles are arranged in classes (e.g. size equivalent classes) on the basis of their attributed features (size and shape parameters).

Numerous size and shape parameters can be determined from the particles images by the appropriate software. Important size parameters are for example (CE) equivalent disc diameter Deq, maximum inscribed disc diameter Din, fiber length XLG (geodesic length) and fiber diameter XFD.

The equivalent disc diameter corresponds to the disc diameter of identical area to 2-D-projected particles, which is often used as size indicator for irregular shaped particles in process technology. On the contrary the maximum inscribed disc diameter of the 2-D-projected particle corresponds more or less to the sieve diameter. The geodesic length and the fiber diameter are suited very well for the characterization of fibers.

There are numerous and very application-specific shape parameters. The aim is to get extra morphological parameters in addition to particle size, whereby the particle characteristics can be better or basically described. Examples are “aspect ratio AD”, the ratio of length to width of the particles, “circularity ZK”, an indicator for particle deviation from the ideal circle and “concavity index C”, which reflects the ratio of area difference of convex envelope and area of the particle to convex envelope. Another important shape parameter is “perimeter”, which displays the particle coverage.

Now the price of particle size instrumentis affordable, if you have needs to buy any particle size analyzer instrument, please contact us.


至: Dandong Bettersize Instruments Ltd.
Your E-mail:

Send to other suppliers

Other supplier products

BeDensi T Pro Series
BeDensi T Pro Series The BeDensi T Pro Series with up to 3 workstations excels at intuitive operation while complying with the United States Pharmacopeia (USP <616&g...
Powder Characterization
Powder Characterization Powder characterizationincludes flow measurements, morphology, particle size distribution, particle measurement, density and chemical composition....
Products Bettersize Instruments Ltd offers a wide range of particle size analysis machineto help you find better solutions for particle size analysis work. ...
BeDensi T Pro Series
BeDensi T Pro Series The BeDensi T Pro Series with up to 3 workstations excels at intuitive operation while complying with the United States Pharmacopeia (USP <616&g...
Dynamic Light Scattering (DLS)
Dynamic Light Scattering (DLS) Founded in 1995, Bettersize is China’s No. 1 player in laser particle sizingbusiness, in the most recent years. At Bettersize, our mission is...

Same products

布隆迪细胞储存液氮容器 KGSQ 冷冻杜瓦瓶
布隆迪细胞储存液氮容器 KGSQ 冷冻杜瓦瓶 卖方: Henan Tianzhidao Biological Technology Co., Ltd. 液氮罐的使用,覆盖科研、畜牧、美食、美容、冷冻配件等行业,但主要还是用于生物样本保存。 保存生物样本可细分为两大类,动物精液和实验细胞。两种用法适用容器不同,各有特色。冻精保存,要配圆提桶使用...
乌克兰大口径液氮容器KGSQ氮气罐 卖方: 河南天之道生物科技有限公司 在生物样本中心或科研机构,有大量的细胞,菌种和疫苗等样本需要进行低温保存。这些样本科研意义重大,安全不可忽视,再加上有批量管理和数据收集需求。通常会选择气相液氮罐而不是航空铝制杜瓦。 气相液氮...
柬埔寨气相液氮罐KGSQ液氮容器 卖方: Henan Tianzhidao Biological Technology Co., Ltd. 在生物样本中心或科研机构,有大量的细胞,菌种和疫苗等样本需要进行低温保存。这些样本科研意义重大,安全不可忽视,再加上有批量管理和数据收集需求。通常会选择气相液氮罐而不是航空铝制杜瓦。 气相液氮...
Electroplated Tools
Electroplated Tools 卖方: Henan E-Grind Abrasives Co., Ltd. Henan E-Grind Abrasives Co., Ltd. produces electroplated tools by plating diamond or CBN grains w...
Electroplated Diamond Tools
Electroplated Diamond Tools 卖方: Henan E-Grind Abrasives Co., Ltd. Electroplated diamond drill bitscan be made in various shapes, so it will be an excellent option ...