DUST CONCENTRATION DETECTION METHOD AND DUST CONCENTRATION SENSOR

摘要

A dust concentration detection method and a dust concentration sensor. The dust concentration detection method comprises the following steps: starting a first light source unit (1) and receiving a first electric signal corresponding to the first light source unit (1), and calculating a first dust concentration value on the basis of the first electric signal; when the first dust concentration value is matched with a first pre-set condition, enabling the first light source unit (1) to be in a closed or a sleep state; starting a second light source unit (3) and receiving a second electric signal corresponding to the second light source unit (3); calculating and outputting a dust concentration value on the basis of the second electric signal and the first electric signal or on the basis of the second electric signal and the first dust concentration value; when the second electric signal or the first electric signal or the first dust concentration value is matched with a second pre-set condition, starting the first light source unit (1) again, thus updating the first dust concentration value. With the dust concentration detection method, the service life of the first light source unit (1) can be prolonged under the condition of keeping certain detection precision.