X-Ray and Metal Detection Systems
X-Ray and Metal Detection Systems
X-Ray Baggage Scanners X-ray inspection is commonly used for security screening of baggage, such as checked and carry-on luggage at airports. The items to be inspected are subjected to x-ray radiation and the unabsorbed radiation passing through the items is collected on photo-detector (typically photodiode) arrays. These detectors output very low-level currents which require special signal conditioning and high resolution data converters are needed to achieve the required resolution to image the scanned items properly. Sometimes this signal conditioning is contained within a single-chip data acquisition solution such as the case where the current-to-voltage (I-to-V) conversion is included with the precision analog-to-digital converter (ADC). Other times discrete very low-current/noise front-end amplifiers measure and amplify the outputs from the photo-detector array and then drive stand-alone voltage-input ADCs.
