The first step to rescue deep in the rubble is to search. The survivors were buried in the rubble pile, and it was obviously too slow to dig up the rubble by hand. It was too slow to move with heavy machinery and may hurt people. Various search instruments can help. "Snake eye" is a kind of search instrument. Its scientific name is "optical life detector", which uses light reflection to detect life.
Double-Convex Lens, also named Bi-Convex Lens,composing of two convex surfaces, has a positive focal length. DCX Lens is most suitable where the object and image are on opposite sides of the lens and the ratio of the image and object (conjugate ratio) distances is between 0.2 to 5. It is used in beam expanders,projection optics systems, optical viewers applications etc.
We also supply kinds of plano-convex spherical lenses,plano-concave spherical lenses,bi-convex spherical lenses,bi-concave spherical lenses,meniscus spherical lenses,special spherical lenses,achromatic spherical lenses,ball lenses,sphere lenses etc..
Specification of our Spherical Lens as follow:
Custom Wide Variety of Diameters and Focal Lengths. Double-Convex Spherical Lens,Double-Convex Lenses,Double-Convex Ar Coated Spheric Lenses,Double-Convex Spheric Lens China Star Optics Technology Co.,Ltd. , https://www.opticsrealpoo.com
The main body of the instrument is very flexible, like a snakeskin tube used for sewerage, which can be twisted freely in the rubble pile. There is a small probe in front of the instrument, which can be used to detect very small gaps. Similar to a video camera, it sends information back. The rescue team can use the observer to see the depth of the rubble clearly. Many anti-theft devices used in museums and supermarkets are such optical probes plus observers.
*Material: BK7,fused silica,MgF2,BaF2,CaF2,ZnSe,ZnS,Ge or other optical crystals
*Dimension Tolerance +0.0 -- -0.1mm
*Center Thickness +/-0.1mm
*Focal Length Tolerance+/-1%
*Surface Quality:60/40
*Surface Figure: lambda/2 at 633nm on plano side
*Clear Aperture >90%
*Chamfer 0.25mm at 45 degree typical
*Coating : AR coating options available :MgF2, VIS 0°, VIS-NIR, NIR I, and NIR II