We also find a hair in the seal seam
With the ASP array, 300 * 300 pixels are recorded during one scan over a seal seam. The depth of the volume to be measured can be several mm. The seal seam width is extracted from the collected signals (for example, the minimum width of the seal seam) and the seal seam can be qualified. The geometric spatial resolution is between 1 micromter to 100 micrometers for standard systems. The ASP camera (Active Sensor Pixel Array) delivers 1 million images per second.
Clear signals provide information about the width of the seal seam, the depth of a sealing failure or about the quality of the seal seam joint. The special feature of the OCT method is the fact that the geometry of the component, the seal seam quality or the degree of filling can be measured with the highest precision in only one working process.
With the new method of time-of-flight measurement, the highest requirements are monitored and guaranteed with the highest quality. In addition to the geometry of a component, the thickness of one film (or several films) and also the thickness of functional layers (gas barrier layer) are measured.
Fascinating like magic – measurement with light
The non-contact measurement of produced products with light takes place with the OCT system nearly 100 x faster than with conventional vision systems and more precisely as one micrometer.
With the help of the new OCT technology, we measure in one go exactely the layer thicknesses, dimensions, volumes, parallelism or the planarity of planes in the process.
Equipment for measuring thermally formed components (Capsule Proving System)
A test kit for measuring the geometry of thermally formed components (e.g., coffee capsules, beverage closures) consists of two OCT cameras with integrated ASP- arrays. The cameras capture the volume in exactly defined spaces. The DUAL measuring head is mounted on a stable platform and sits on a coordinate system with a step resolution of 1 micrometer up to 100 nm.
Non-contact measurement of the layer thickness in different kind of films
The quality of layers or coatings must be continuously monitored and controled during the production process in order to ensure the functionality of the product at all times, thus fulfilling the highest requirements of the customer. The continuous control in the current production or the off line control can therefore hardly be avoided in the future.
With the OCT method, deep-resolved images (tomograms) are created by the material. For this purpose a monochromatic light front is emitted. The backscattered light is analysed in an interferometer. The contrast in the material originates from scattering processes at structural boundaries, which are a transition in the optical refractive index (e.g., transient adhesion promoters to the gas barrier layer).
Light is scattered at different scattering centers in all directions, but a small part of it extent exactly opposite to the direction of incidence and is reflected back to the OCT-sensor. In order to let light penetrate deeply in the material, longer wavelengths are often used. The average free path length for scattering processes in optically scattering material (opaque, milky) is of the order of magnitude of several 100 μm to a few millimeters.