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1. (WO2018032802) DUST SENSOR

Pub. No.:    WO/2018/032802    International Application No.:    PCT/CN2017/082953
Publication Date: Fri Feb 23 00:59:59 CET 2018 International Filing Date: Thu May 04 01:59:59 CEST 2017
IPC: G01N 15/06
Applicants: GD MIDEA AIR-CONDITIONING EQUIPMENT CO., LTD.
广东美的制冷设备有限公司
MIDEA GROUP CO., LTD.
美的集团股份有限公司
Inventors: ZHOU, Hongming
周宏明
SHEN, Zhicong
沈志聪
LIU, Mingliang
刘明亮
PENG, Shuo
彭烁
Title: DUST SENSOR
Abstract:
A dust sensor (1), comprising an air passage (10), a light emitting assembly (35), a photosensitive element (11) and a processing element (21). The light emitting assembly (35) comprises a light emitting tube (30) and a lens assembly (36, 37, 38), the light emitting tube (30) being used for emitting light to illuminate the air flow circulating in the air passage (10), the lens assembly (36, 37, 38) being located on the optical path of the light to concentrate the light emitted by the light emitting tube (30). The photosensitive element (11) is located in the air passage (10) to receive scattered light which is generated after the light illuminates dust. The processing element (21) determines the dust content on the basis of the scattered light, and adjusts the detection distance between the photosensitive element (11) and the lens converging light of the lens assembly (36, 37, 38) to achieve the highest resolution of the dust sensor (1).