Patent ID: 9310247
Filing Date: 2016-04-12
CPC Classification: G01J

Claim Text:
1. An apparatus, comprising: at least one photosensitive device configured to provide an output in response to at least one photon; at least one shielded compensation photosensitive device configured in use to provide a dark current value; and a compensation circuit configured to modify said dark current value of said at least one shielded photosensitive device to provide a temperature compensated dark current value; and wherein said compensation circuit is further configured to provide dark current compensation for the output of said photosensitive device by processing temperature information and temperature dependent calibration information to compensate for dark current; wherein said temperature dependent calibration information is dependent on a calibration measurement of dark currents output from at least one of the photosensitive device and the shielded compensation photosensitive device at a first and a second, different, calibration temperatures.