Smoke detection sensor circuit and smoke sensor

Abstract

The invention relates to a smoke detection sensor circuit and a smoke sensor. The smoke detection sensor circuit comprises a transmitting circuit, a receiving circuit and a controller; the transmitting circuit comprises an infrared transmitting tube, and the infrared transmitting tube is used for transmitting infrared light; the receiving circuit comprises an infrared receiving tube, and the infrared receiving tube is used for receiving the infrared light emitted by the emitting circuit; the controller is electrically connected with the transmitting circuit and the receiving circuit, controls the intensity of the infrared light transmitted by the transmitting circuit by controlling the magnitude of the current flowing through the infrared transmitting tube, and determines the smoke concentration according to the intensity of the infrared light received by the receiving circuit; and the technical problems that in the prior art, the smoke dynamic measurement range is narrow and cannot be adjusted, and the range of the smoke alarm response threshold value is limited are solved, the detection range of the smoke detector is increased, and meanwhile self-adaptive adjustment of the dynamic measurement range of the smoke detector is achieved.

Description

technical field [0001] The invention relates to the technical field of smoke sensors, in particular to a smoke detection sensor circuit and a smoke sensor. Background technique [0002] The detection of smoke concentration is usually realized by utilizing the principle of light scattering when light encounters smoke particles. The general implementation method is to use near-infrared photoelectric detection technology. When the infrared light emitted by the infrared emitter irradiates a group of smoke particles, the light will undergo diffuse reflection, and this reflection will be strengthened as the concentration of smoke particles increases. The infrared light receiver receives the reflected light, and converts the light intensity analog signal into a discrete digital signal that the microprocessor can identify and process through the photoelectric conversion circuit. By running the algorithm analysis program in the microprocessor, the smoke detector can measure the con...

AI Technical Summary

Problems solved by technology

[0003] However, for the existing smoke detectors, the smoke dynamic measurement range is narrow and cannot be adjusted, which limits the range of the smoke alarm response threshold, making the applicable scenarios of the smoke detector relatively limited; and it is easy to cause false alarms when used for a long time

Images