Detection circuit with smoke concentration infrared detection function and detection method of detection circuit

Abstract

The invention discloses a detection circuit with a smoke concentration infrared detection function and a detection method of the detection circuit. The detection circuit comprises a processing module,an infrared receiving tube and an infrared transmitting tube, wherein the infrared receiving tube is connected with the processing module and is used for collecting current ambient light and currentsmoke to acquire voltage signals corresponding to the current ambient light and the current smoke and sending the voltage signals corresponding to the current ambient light and the current smoke to the processing module; the processing module is connected with the infrared transmitting tube and is used for controlling turn-on and turn-off of the infrared transmitting tube; and the processing module is used for performing compensation according to the voltage signals of the infrared receiving tube to obtain the smoke concentration corresponding to the current smoke. In this way, the voltage signals corresponding to the ambient light and infrared light used for smoke detection are detected respectively by controlling the turn-on and turn-off of the infrared transmitting tube, and the influence of the ambient light on a test result can be effectively corrected. Besides, according to negative temperature characteristics of PN junctions of diodes, a temperature compensation circuit is adopted to perform temperature correction, and therefore the influence of temperature drift characteristics of the infrared receiving tube on the test result can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of range hood control, and in particular relates to a detection circuit for infrared detection of smoke concentration and a detection method thereof. Background technique [0002] Infrared smoke concentration detection is a feasible means of low-cost smoke concentration detection. The smoke concentration of range hoods is usually detected by infrared light. The method of infrared smoke concentration detection is simple, feasible and low in cost. However, infrared detection is usually greatly affected by ambient light and ambient temperature; In order to reduce the impact of ambient light, the smoke channel is specifically designed as a maze, and the labyrinth-shaped smoke channel forms an ambient light darkroom, thereby reducing the impact of ambient light. However, the detection device has a complex structure and high cost; in addition, infrared light accepts Due to the influence of temperature, the test v...

AI Technical Summary

Problems solved by technology

The smoke concentration of range hoods is usually detected by infrared light. The method of infrared smoke concentration detection is simple, feasible and low in cost. However, infrared detection is usually greatly affected by ambient light and ambient temperature; In order to reduce the impact of ambient light, the smoke channel is specifically designed as a maze, and the labyrinth-shaped smoke channel forms an ambient light darkroom, thereby reducing the impact of ambient light. However, the detection device has a complex structure and high cost; in addition, infrared light accepts Due to the influence of temperature, the test value will be too large when the temperature rises, and the temperature drift characteristics of the infrared light receiving tube affect the accuracy of smoke concentration detection

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