X-ray technology is used to measure product fill level in steel, aluminum, glass, plastic and paper containers.
An x-ray tube energized at high voltage is used to produce a low energy x-ray beam. This x-ray beam is focused to look through the container in the expected fill level region. As the x-ray beam penetrates the container, it is attenuated by the amount of product blocking the beam. The beam is then monitored by a scintillation detector, which counts the x-ray intensity after it goes through the container. The level of intensity is proportional to fill level and user set rejection limits define the high or low fill level threshold. Containers outside the acceptable limit are rejected.