| 摘要 |
<p>Disclosed is a pixel circuit comprising a single photon avalanche diode (SPAD) and a measurement circuit comprising a capacitance. The SPAD detects a photon incident on said SPAD; and the measurement circuit discharges the capacitance at a known rate during a discharge time period. The length of the discharge time period is determined by the time of detection of the photon, such that the final amount of charge on the capacitance corresponds to the time of flight of the photon. Also disclosed is a time resolved imaging apparatus comprising an array of such pixel circuits, and a corresponding method of measuring the time of flight of a photon.</p> |
