Study of Laser Detection Method for Air Suspended Particles

• Main Authors: WU, KE-LUNG, 吳克隆
• Other Authors: CHEN, DER-CHIN
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/q4xq4n

碩士 === 逢甲大學 === 資訊電機工程碩士在職專班 === 105 === Particulate matter (PM) often exceeds the standard value in central and south area of Taiwan in recent years. Airborne particulate matter problem affects our life environment and health a lot and this problem exists in most countries of the world. To monitor the airborne particulates has been attracted more and more attention with the increasing of living standard and health awareness. The aim of this study was to establish a technique for detecting the suspended particulates. The method is to use the laser light to spray the particulate matter to produce scattering, and to collect the scattered light at a specific angle to obtain the scattering intensity associated with the time curve. After the microprocessor is processed, the relationship between the time domain and the frequency domain is obtained by Fourier transform, and then the equivalent particle size and the number of particles per unit volume are obtained statistically. The measurement range PM1.0 to PM2.5,Counting efficiency of about 0.3µm 50%±20％、0.5µm 100％±10％, the response time of about 10 seconds. Through this study, we can produce an immediate monitoring system with the suitable use of the laser sensing device to detect the particulate matter, so that people can keep aware the air condition in time.