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VisiSizer Systems
Aug 2007
Oxford Lasers Ltd.Request Info
For Paint Spray Characterization
DIDCOT, England, Aug. 21, 2007 -- VisiSizer systems provide a range of optical spray characterization systems and have the ability to measure down to 1 µm with high data rates, high resolution images and real-time data analysis, according to the manufacturer, Oxford Lasers.

Oxford Lasers can provide sizing, velocity measurement and images all in the same system, the company said, features that can improve efficiency and be less expensive for manufacturers.

VisiSizer provides unique insight into three key aspects of the paint spraying process -- the break up of the spray into droplets, the size and velocity distribution of the droplets, and the adherence of the droplets to the component surface. The cost and quality of paint spraying operations, especially in the automotive industry, are of vital importance to manufacturers.

For small manufacturers using air guns to apply coating to components, large quantities of paint and adhesive are frequently wasted because spray guns are unable to target coating material with any accuracy. For large manufacturers using electrostatic spray coating systems (not suitable for small components) it is essential that accurate quality assessment can guarantee that paint and adhesive are being correctly deposited on to target surfaces. For all manufacturers, government guidelines continue to place ever more stringent requirements on all kinds of spray processes and any resulting emissions.

By using VisiSizer to obtain measurement data and images, it is possible to see exactly where paint is being sprayed, if it is missing the target component, if the paint is being distributed evenly, if the paint is adhering to the surface, and if the paint spray nozzle requires adjustment or a different design. Significant cost savings can be made by more accurate paint spraying with consequent reductions in the amount of paint, adhesive or solvent used. More efficient use of coatings, either liquid or powder, also results in reduced emissions. Optical spray characterization eliminates the time consuming and expensive traditional measurement techniques currently being used by many test engineers.

The VisiSizer sizing technique operates by using a very short flash of light from a laser to illuminate a diffusing screen in order to backlight the subject. A digital camera with a microscope lens captures images of the spray cloud which are processed to extract data regarding spray size, shape and velocity. Even non-spherical droplets can be accurately sized -- something that is almost impossible by any other method, the company said.

By using dual laser flashes in short succession, image quality is greatly improved and a greater range of information is obtained. A paint spray plume contains particles often moving at such high speeds that conventional lighting would result in problems with motion blur. VisiSizer is able to completely eliminate motion blur and by using proprietary software it can measure the movement of paint particles and paint velocity, allowing velocity vs. size distribution analysis to be computed. These automatic calculations can dramatically boost the efficiency of paint transfer, allowing manufacturers to use less coating material more effectively, Oxford Lasers said.

For more information, visit:; e-mail:

Oxford Lasers Ltd.
Unit 8, Moorbrook Park
Didcot, OX11 7HP
Phone: +44 (0)1235-812255
Fax: +44 (0)1235-810060


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