SPACE1 Tests Small Exampling Optical Cloaking Device
https://space1usa.blogspot.com/2021/04/space1-cloaking-device.html
However, there's a more simple way to create an exampling cloak without the number of glass optical lenses set to calibrated focal lengths. Using a single flat 2D-appearing sheet of lenticular resin the shape of a credit card and a pen to represent the spacecraft or rocket, a mechanical calibration either shows the object or puts it into full cloak.
Simplifying Cloaking Technology
This re-directing of lightwaves causes what is on either side of the lens to appear as though it is directly behind the lens, effectively making what’s actually behind the lens to seemingly disappear. Larger sample cloaking devices can be made from sheets of 3D Lenticular resin lenses imported from China. A Lubor’s lens is more correctly called a lenticular lens which consists of an array of identical linear prisms usually molded into a sheet of clear plastic. A Fresnel lens consists of an array of circular prisms whose angles increase and widths narrow with distance from the center. A linear Fresnel lens would have the increasingly refractive prisms in a linear array to form a line focus. The original Fresnel lenses, named after the inventor—a famous French optics guy, were first used in lighthouses to collimate searchlight beams, while modern usage is often found using molded plastic sheets used in solar cookers and other applications where a flat lens is desirable. The Lubor’s lens is used in ‘invisibility cloak’ demonstrations, and is named after the magician who promoted the effect.
Lenticular Lens Design
A lenticular lens design allows very high powered convex or concave lenses to be used in situations when lens size, thickness, or weight, would otherwise be problematic. Lenticular lenses are often used for eyeglasses when the lens powers are >+/-15.00D. The optical portion of the lens is molded to a flat “carrier” lens that is usually close to plano, or zero, in power. Below is an example of a very high plus lens in lenticular design. You can see that the strong Rx is only in the circular area at the lens center.
Fresnel Design
Another way to put very high powered lenses into a thinner configuration is to use a “Fresnel” design. This involves using multiple small lenses placed over a flatter “carrier” lens. This is most commonly used for magnification (convex or plus powered lenses), or for prism lenses (wedge shaped lenses that move the location of an image rather than change its size). The cross-section image below illustrates a Fresnel lens that incorporates multiple small prisms instead of one very thick prism. While this design has many optical and industrial applications, it is only used for prism in ophthalmic lenses. The lines created by the prisms can interfere somewhat with lens clarity.
A Lubor lens is a variation of a Fresnel prism lens design, and like any linear prism it will deviate the image in one direction, and along one axis only. If the lens is oriented so that the horizontal lines are parallel with the object being viewed, that image will be moved forward and be visible, but any objects in the meridian 90° away, will be blocked (and vice versa). Lubor lenses are used primarily by magicians! Buying Lenses
You don’t make a Fresnel lens, you buy them. They are mostly made of glass and clear plastic materials such as acrylic and polycarbonate. They work by stepping the surface of the lens to remove the mass that would make a normal lens very thick if the lens surface was continuous.
