Sunday, March 28, 2010

防蠅水袋 - Taiwan's amazing "Black Fly Water Bag Door Scaring Contraption" - "Fan Ying Shui Dai"




http://www.shazhang.com/uploads/allimg/c090216/1234K3D9530-13158_lit.jpg
小小挂水袋 轻松驱蚊蝇



It's not a fly catcher per se, and in fact, it's not a fly-catcher at all. What this bag of water hanging down
in the sunlight above a door to a restaurant in Taiwan or around a food seller's table at an open air market  can do is this: SCARE THE FLIES AWAY.

HOW DOES THIS AMAZING PIECE OF LOW-TECH FLY SCARING EQUIPMENT work?

The flies' eyes are attracted the sunlight reflected and refracted in the bag of water, and they STEER CLEAR of the area, sensing DANGER, even though there is no electric shock danger and in fact no danger at all, just the light reflected in the clear water bag hanging from a rail or a door frame will scare them away. I saw this amazing technology for the first time today while dining at a local buffet shop in Chiayi.



Subject: 防蠅水袋

''fan ying shui dai''

昨日,有市民在深圳论坛上发帖晒自己的惊奇发现。这位市民说,随朋友一起到位于沙井和公明交界的一家“农家乐”餐厅吃饭。车刚停稳,就发现这家餐厅平台栏杆上整齐地挂满了一个个装水的袋子,很是惊奇。经向店家询问,原来这还是个“高科技”呢——此店位于山坳,蚊蝇较多,为了不让漫天飞舞的家伙败了食客兴致,店家在栏杆上挂满了水袋,里面装的就是普普通通的自来水。水袋反射光线,吓跑蚊蝇,食客们就可以安心就餐,不用担心坏家伙的骚扰了。记者在就餐期间果然没有发现蚊蝇。








昨日下午,记者询问位于南澳一带的几处“农家窑鸡”食档,向他们请教水袋的作用和原理。在龙岗区半坝村一处山沟多年从事“农家乐”经营的黄先生说,这种办法家家都在用,也不知道是谁发明的。方法非常简单:只要随手取个结实一点的塑料袋,灌上自来水,沿食档四周悬挂起来就行了。







至于驱蝇的道理,黄先生说,苍蝇的眼睛有放大镜的作用,而水袋折射出的光线又会像镜子一样将苍蝇自己的形象放大很多倍,同时,水袋发出的亮光,刺激了它的眼睛——是苍蝇自己吓倒了自己,所以不敢靠近水袋四周。



深圳福田中学生物老师田穗兴说,可能因为透明水袋有凸透镜的作用,光线在透过“凸透镜”时一定会对周围的光强、温度产生改变,而这种变化正好刺激了苍蝇的某种敏感器官,于是让苍蝇敬而远之。对于是否“放大镜”的作用吓跑了苍蝇,田老师说,理论上并不成立。



实际上,挂水袋驱蚊蝇并非深圳“农家乐”独创。在港澳台地区,很多肉档、水果摊档都会在经营场所四周吊水袋驱赶蚊蝇。实验表明,水袋中水的折射作用的确可以达到驱赶蚊蝇效果,并发现袋中用紫色的水效果更好。

http://www.shazhang.com/html/chuhaizixun/20090216/1196.html

No comments: