Infrared (ir) sensor

A device comprising:

• an enclosure;
• a semiconductor die;
• and
• a sensing system enclosed by the enclosure and the semiconductor die and electrically coupled to the semiconductor die, the sensing system comprising:
• a thermal absorption layer;
• a primary thermal sensor and a crosstalk thermal sensor, wherein at least a section of each of the primary thermal sensor and the crosstalk thermal sensor is in the thermal absorption layer;
• a first metal layer at least in part embedded within the thermal absorption layer, the first metal layer at least in part overlapping with the primary thermal sensor;
• and
• a second metal layer above the thermal absorption layer, the second metal layer at least in part overlapping with the crosstalk thermal sensor.

An apparatus comprising:

• at least one primary thermal sensor and a plurality of crosstalk thermal sensors, wherein each of the plurality of crosstalk thermal sensors comprises a sensing junction;
• a metal layer in thermal contact with the sensing junction of each of the plurality of crosstalk thermal sensors;
• and
• processing circuitry electrically coupled to the at least one primary thermal sensor and the plurality of crosstalk thermal sensors, the processing circuitry configured to:
• estimate a crosstalk experienced by the primary thermal sensor, based at least in part on outputs of one or more of the plurality of crosstalk thermal sensors;
• and
• determine a temperature of a target heat source based on an output of the at least one primary thermal sensor and the estimated crosstalk.