What does a x ray baggage scanner do?
Baggage machines use x rays to screen objects non-invasively. To learn more about x rays click here. X-ray inspection is commonly used for security screening of baggage, such as checked and carry-on luggage. The core system consists of x ray source, L shape photo detectors and software. They’re used to build a picture of what’s inside baggage and allow security staff to check anything that looks suspicious. X-rays launched from one side of the machine are picked up by a pair of detectors on the opposite side. As your bag enters through the lead-lined curtains, it crosses the path of these X-rays and absorbs some of the energy they carry. This means that the X-rays that passed through the baggage have less energy than those that sailed straight past.
How does x ray baggage scanner work?
The items/baggage to be inspected are subjected to x-ray radiation (as it passes through the conveyor belt) and the unabsorbed radiation passing through the items/baggage is collected on photo-detector (typically L photodiode) arrays. These x ray detectors output very low-level currents which require special signal conditioning and high resolution data converters to achieve the required resolution to image the scanned items properly. Data from individual x ray detectors is pre processed and combined with data from the other detectors to form a complete image in real time on the computer screen.
Using software algorithms, atomic number of each pixel is calculated and 3 color or 6 color coding is done for the baggage passing through the tunnel. Organic materials like paper, cloth and food are orange, light metals like aluminium are in green and dense metals are in blue. The denser the material, the darker the colour.
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