HDPE fresnel lens advantages 

HDPE fresnel lens advantages The Fresnel lens, simply say to be in the lens side have equi-distant tooth tattoo. Through these tooth tattoo, can achieve to specified spectrum light band tong (reflecting or refraction) role. The traditional grinding optical equipment band-pass optical filters are expensive. The Fresnel lens can greatly reduce costs. A typical example is PIR (passive infrared detector). PIR used widely in alarm. product model 7601-15 7626 7626-A specification 52*72*0.6mm 74.8*26*0.6mm 67.5*26*0.6mm focal length 22mm 25mm 25mm angle 120° 120° 120° distance 12m 12m 12m material HDPE…