Device for detecting an object using SPAD photodiodes

摘要

The disclosure relates to a method for detecting the presence of an object near a detection device, comprising: emitting pulses of an incident photon beam, detecting photodiodes which trigger avalanche after the reception by the photodiode of at least one photon of a reflected photon beam produced by a reflection of the incident beam on an object near the detection device, determining a distance between the photodiodes and an object in a detection area, as a function of the time between a transmit time of the incident beam and avalanche triggering times of the photodiodes, and correcting the distance determined as a function of a calibration measurement obtained in the absence of object in the detection area, to compensate for photon reflections on a transparent plate arranged between the photodiodes and the detection area.

主权项

1. A method, comprising:
detecting an object in a detection area with a detection device, the detection device having a plurality of single photon avalanche photodiodes, each photodiode having a PN junction having a breakdown voltage, the detection device having a transparent plate between the photodiodes and the detection area, the detecting including:
generating a bias voltage in a bias voltage generation circuit, the bias voltage being greater than the breakdown voltage of the PN junction of each photodiode;reverse biasing the single photon avalanche photodiodes with the bias voltage;emitting pulses of an incident photon beam, the pulses of the incident photon beam being configured to generate a reflected photon beam from a reflection on the object;detecting ones of the photodiodes avalanche triggering in response to receiving at least one photon of the reflected photon beam;determining a distance between the photodiodes and the object in the detection area, as a function of a transmit time of the incident photon beam and an avalanche triggering time in the photodiodes after receiving at least one photon of the reflected beam;performing a calibration measurement of the detection area when the detection area is empty;determining a correction value based on avalanche triggering in the photodiodes in response to reflections of the incident beam by the transparent plate and based on the calibration measurement; andcorrecting the distance using the correction value by compensating for avalanche triggering in the photodiodes in response to reflections of the incident beam by the transparent plate.