Methods and systems for infrared synchronization

A door sensor, comprising:

• a first emitter configured to emit an emission beam comprising IR light during an emitting phase;
• a lens configured to form an IR pattern on a surface by:
• duplicating the emission beam to form a first duplicated beam and a second duplicated beam,
• directing the first duplicated beam to a first reception area on the surface, the first reception area comprising the first duplicated beam and a third duplicated beam from a second emitter, and
• directing the second duplicated beam to a second reception area on the surface;
• a receptor configured to receive a reception beam from the first reception area, the reception beam comprising one or more of the first duplicated beam and the third duplicated beam reflected from the surface during a listening phase;
• the receptor further configured to receive an interference beam transmitted from an adjacent door sensor during the listening phase;
• and
• a controller operatively coupled to a memory storing computer-readable instructions that, when executed by the controller, cause the controller to:
• determine one or more of a frequency and a phase of the interference beam,
• determine whether the emitting phase should take precedence over the transmission of the interference beam, and
• adjust a timing of one or more of the emitting phase and the listening phase to reduce interference from the interference beam.