X-ray phototimer

摘要: A phototimer for controlling x-ray exposure includes an array of sensors, and digital processing electronics calculating by selecting one or more signals from the selected signals. After exposure, calculated is employed to control either displaying operator who compares with a desired repeats if necessary, automatically terminating sending signal source. The improvement in state technology resides automatic selection subset plurality photosensors, thereby improving reliability measurement. In prior art devices, sensors were manually switch, all predetermined algorithm.