Verifier Software

Standards - Limits - Solutions

Verification Software based on ISO/IEC 15415 | Technical Report TR29158

(White Paper DPM Verification from Dr. J.Gaessler and H.Richter / IOSS GmbH)

In today┬┤s industrial processes, many product components are coded so that they can be traced throughout the entire production process. The data from these codes contain important information that ensures increased transparency along the entire value-added-chain.

In addition to conventional barcodes that are often attached as labels, 2D codes are frequently used in industrial applications. The most commonly used symbology is DataMatrix Code. With its high memory density and in-built error redundancy, these codes are advantageous and allow larger memory quantities to be stored. Next to printed codes and labels, direct part marking (DPM) is also very important. Here, the code markings are printed directly onto the surface of the component. Depending on requirements with respect to material, surface quality, durability, process conditions, marking speed, ect., various marking procedures such as dot peening, laser or inkjet marking to name the most important ones, can be used with different advantages and disadvantages.

Regardless of the marking procedure, it is important to verify the code quality and maintain its readability throughout all processing stages. With the goal of maintaining the readability of codes throughout processing, a series of standards and provisions have been developed for verifying DataMatrix Codes.

The currently valid standards ISO/IEC 15415 | Technical Report TR29158 form the basis for what is used to objectively verify the quality of directly marked DataMatrix codes. The additions and improvements from AIM-DPM Guideline represented a major step forwards in the right direction. Not only the recording and lighting situations were improved, the calculation methodology was also adapted to meet current demands from the field. So it is clear to say that with the currently valid standards it is possible to verify the quality of codes marked by lasers or inkjets and also to reproduce the verification inline!

But what about dot-peened Codes?
For dot-peended codes, which are very common in the automotive sector, these guidelines are only conditionally suitable. They are only useable when the dot-peened codes are applied to ideal surfaces. But what to do when the surfaces and conditions are not ideal? In the field the material often is coated, treated, buffed, curved.... Very often verification performed according to ISO/IEC15415 standards, lead to poor results although the code itself is perfectly peened and readable throughout the whole process.

What are the solutions to these discrepancies?
As an expert in reading dot-peened codes we have thought a lot above these discrepancies and can offer now a software which is suitable for inline quality assurance of dot-peened DataMatrix codes. In addition to decoding code content, various qualifying criteria are provided that allow the reproducibility of the marking procedure to be determined. The goal of these tests is to detect changes in marking quality at the earliest possible stage and thus avoid problems later in the scanning process.

If you are interested in our software "rated reading" and/or in the whole report of this white paper, please send us an e-mail to info@ioss.de.

We are looking forward to hearing from you.