| 摘要 |
<p>The invention relates to a device comprising a photosensitive element (42) producing an electric charge in accordance with the radiation (44) incident thereon and a charge integrator (46, 48, 50) connected to the photosensitive element (42) and converting the charge to a voltage. According to the invention, the device includes a comparator (52), capable of comparing the voltage delivered by the integrator (46, 48, 50) with a threshold voltage, and a memory unit (56) for storing the instant when the voltage delivered by the integrator exceeds the threshold voltage.</p> |
