Abstract: A temperature sensing system senses a temperature in the monitor space. The temperature sensing system includes a first detector, a second detector, and a processing unit. The first detector detects a temperature on a ceiling and outputs first information about the temperature on the ceiling. The second detector detects infrared radiation emitted from a floor and outputs second information about the infrared radiation from the floor. The processing unit calculates, based on at least the first information and the second information, a spatial temperature distribution which includes a component in a height direction with respect to the monitor space between the ceiling and the floor.

Abstract: The present disclosure includes: an infrared sensor configured to detect an infrared ray and output a thermal image; a temperature sensor configured to detect a temperature of the infrared sensor; and a processor configured to process output signals of the infrared sensor and the temperature sensor, and the processor is configured to estimate a temperature distribution in a space between the infrared sensor and a background in a detection direction of the infrared sensor from a background temperature of the thermal image and the temperature of the infrared sensor.