There are many types of sensors for online measurement and they can be classified into two (2) families:
- 1. Sensors that contact the measured material
- 2. Non-contact sensors
Scantech offers only the latter category: non-contact sensors. These sensors satisfy the vast majority of applications by means of the
following four (4) technologies:
- 1. X-ray Sensors: Scantech is the leader in this technology
and was the first to introduce in 1992 an x-ray sensor for the thickness measurement of plastic films and in 1993 for the weight of non-woven materials.
X-ray sensors are used, almost exclusively, for the measurement of the thickness of metal sheet.
- 2. Infrared Sensors: Scantech systematically uses these type of sensors to measure the thickness of barrier layers of multi-layer films, and often use them for the measurement of coating weights and humidity.
- 3. It is a technology that Scantech offers as a last resort when it is the best compromise for the measurement of thickness or weight. Beta sensors use a radioactive source which causes more and more difficulties for customers regarding legal compliances.
- 4. Laser Triangulation Sensors: Scantech has developed its own proprietary design. This sensor is used for measuring the thickness of inhomogeneous materials (i.e. variable density, layers of very different nature, foam…). Theses sensors can also quantify the material surface such as roughness.
Different types of sensors can be coupled on the same scanner in order to achieve other measurements. For example, an X-ray sensor coupled with a Laser triangulation sensor can measure the density of a material.
All Scantech sensors are interfaced through the internal scanner bus and possess a local intelligence allowing the direct digitization of the sensor signals and the pre-processing of measurements.