Olympus Logo
Olympus LogoOlympus Logo
Application Notes
Back to Resources

Ripple Marks Formed in Die-Casting / 3D shape measurement using a laser microscope


In the die casting process, molten metal flowing into the mold may harden before it is fused completely, producing shallow wrinkles on the die-cast surface. This phenomenon is known as ripple marks. The ripple marks are problematic because they distort the external appearance of the product and may cause damage or deformation when stress is applied.

The Olympus solution

Olympus' OLS4100 3D laser scanning microscope makes it easy to accurately image a three-dimensional surface profile down to the micron level. Users can perform defect management using numerical surface roughness data, which is the best method for quality control. With the OLS4100’s image stitching feature, users can create high-contrast images of the entire defect location. Moreover, because the microscope is contactless, the object’s surface will not be scratched.

Non-defective surface



Objective lens 20X, Zoom 1X; 6×3 stitching

Defective surface



Olympus IMS

Products used for this application


With the Olympus LEXT OLS5000 laser scanning confocal microscope, noncontact, nondestructive 3D observations and measurements are easy to produce. Simply by pushing the Start button, users can measure fine shapes at the submicron level. Ease of use is combined with leading-edge features to deliver an acquisition speed four times faster than our previous model. For customers with larger samples, LEXT long working distance objectives and an extended frame option allow the system to accommodate samples as large as 210 mm.
Sorry, this page is not available in your country

Let us know what you're looking for by filling out the form below.