초록 ▼

A carbon dioxide sensor has an arithmetic unit 12 that predicts the minimum value of carbon dioxide concentration that is regulated by the diffusion of the atmosphere by judging that a signal from a carbon dioxide concentration sensing unit 1 indicates a declining tendency and a calibration unit 13

A carbon dioxide sensor has an arithmetic unit 12 that predicts the minimum value of carbon dioxide concentration that is regulated by the diffusion of the atmosphere by judging that a signal from a carbon dioxide concentration sensing unit 1 indicates a declining tendency and a calibration unit 13 that updates the sensitivity correction factor based on the predicted minimum value. This permits quick calibration by eliminating the need to wait until the carbon dioxide concentration in any given environment reaches the minimum value.

대표청구항 ▼

1. A carbon dioxide concentration sensor, comprising:an arithmetic unit; a carbon dioxide sensing unit having an output coupled to an input of the arithmetic unit; and a calibration unit adapted to receive an output of the arithmetic unit and the output of the carbon dioxide sensing unit, wherein th

1. A carbon dioxide concentration sensor, comprising:an arithmetic unit; a carbon dioxide sensing unit having an output coupled to an input of the arithmetic unit; and a calibration unit adapted to receive an output of the arithmetic unit and the output of the carbon dioxide sensing unit, wherein the arithmetic unit predicts a minimum value of a carbon dioxide concentration in an environment when the carbon dioxide concentration is declining over a plurality of successive time intervals, and wherein the calibration unit updates a sensitivity correction factor of the carbon dioxide sensing unit based on said minimum value of the carbon dioxide concentration predicted by the arithmetic unit.