If you want to see the hologram, open your wallet, you can see them on your drivers license and identitfication card, credit card, The hologram is closely related to our lives, you can find him everywhere around us
What is a hologram and how it work?
When we look at a photo, we can generally judge the distance of the object based on the occlusion relationship between the objects, experience and shadows in the picture. but there is no three-dimensional feeling when viewing real objects. This is because when the camera is used for shooting,
- Only the light intensity information of the object is recorded,
- And the depth information of the object is included in the phase.
How to record the intensity information and phase information of the light simultaneously
Scientists have discovered that the interference of light can just meet the demand.
The speed of light is too fast，Chemical substances can only distinguish the magnitude of light intensity, so given a definite reference beam, the phase of the object beam can be recorded by means of light intensity.
How interference work ?
Laser is a very good light source. If you divide a laser beam into two, you can get two light sources.
If the two light beams are separated into two round spots, and the irradiation area of the laser is enlarged so that it can cover the scene objects, two round spot light sources can be obtained.
- One of the round spots illuminate the object, which is called object light.
- The other one shines directly on the film and is called the reference light.
In this way, two light sources are superimposed to form interference, and after a period of irradiation, interference fringes are obtained on the film, which is a hologram.
Any recording in a two- or three-dimensional medium of the interference pattern produced whenever a point source of light of a fixed wavelength meets the light of the same fixed wavelength coming from an object is a hologram. The source of light is the reference beam, while the object is the object beam.
Sometimes, the hologram may be illuminated by the reference beam, with the resulting diffraction pattern recreating the waver fronts of light from the original object. When this happens, the viewer is presented with an image that cannot be separated from the original object.
Types of Hologram
Holograms exist as different types and are classified in various forms. Let’s take a look at some types of holograms.
When a truly-dimensional image is seen near its surface, that is a reflection hologram. Most galleries offer reflection holograms. The illumination in a reflection hologram comes from a “spot” of white incandescent light, which is positioned at a certain distance and angle. The illumination source is also located on the viewer’s side of the hologram, which means that the image is made up of hologram-reflected light.
We now have holograms made and shown in color, such that it is impossible to differentiate such images from the original objects optically. In the case of the mirror as the object, the reflection of the holographic image is white light – it is a “sparkle” diamond holographic image when a diamond is the object.
When the object and reference beam incident on the holographic film is on the same side, we have a transmission hologram. You can save money on transmission holograms by producing them in mass. You need the same type of laser light used in recording a transmission hologram to view it. The light comes from behind the hologram, with the image being transmitted to the observer’s side. The virtual image from transmission holograms is known for its sharpness and depth.
Each piece of a broken transmission hologram will still offer an image of the entire scene. It may be possible to see a different perspective if the location of the piece (hole) changes. Likewise, directing an undiverged laser beam backward (relative to where the reference beam is facing) may achieve a real image projection onto a screen positioned at the same spot as the object’s original position.
There can be several variations of holograms somewhere in between the transmission and reflection holograms.
Embossed Holograms are created by pressing a two-dimensional interference pattern onto thin plastic foils, with the original hologram recorded on a photoresist – a photosensitive material. This type of hologram is ideal for security applications, for instance, the eagle on the VISA cards. Embossed holograms have grooves on the surface on full development. A nickel layer previously deposited is removed, leaving a metallic shim – the primary shim. The primary shim can produce more shims – secondary shims. The shim is placed on a roller, and with the pressure and temperature increased, it presses or embosses the hologram onto a roll of Mylar or a similar composite material.
Combining a series of photographs (transparencies) of an object can produce integral holograms. These transparencies can be that of a computer graphic, an outdoor scene, an X-ray, or a live person’s picture. Several discrete views are derived by scanning the object with a camera – each view is displayed on a laser light-illuminated LCD screen. The view then serves as the object beam in recording a hologram on a holo plate – a narrow vertical strip of holographic plate. Likewise, the next view is recorded on an adjacent strip, and this continues until you have recorded all the views. In the end, the finished composite hologram is viewed such that the right and left eyes view images from various narrow holograms, thus producing a stereoscopic image. It is also possible to do the original recording with video cameras, with the resulting images manipulated using computer software.
It is possible to measure the microscopic changes on an object quantitatively by making two exposures on a changing object. Both images interfere with fringes showing on the object that reveal the vector displacement. This is called holographic interferometry.
If the virtual image is compared directly with the real object, the result is real-time holographic interferometry. Holometry can render shock waves, heat, and other invisible objects visible; hence, it is widely used in engineering.
Unique scenes can be observed by changing the angle of the viewing light on the same hologram. This concept comes in handy for massive computer memories.
Mathematically, holography has three essential elements – the image, the hologram, and the light source. It is possible to compute one of the three elements if the other two can be predetermined. For instance, the diffraction pattern can be estimated if there is a parallel beam of light of known wavelength and a double-slit system. Likewise, it is possible to estimate the light’s wavelength once the double-slit system details and the diffraction pattern are known. So, it is possible to dream up any pattern of interest. Once the observation wavelength is decided, the hologram can be computed using a computer. These are called computer-generated holography (CGH). CGH is a rapidly growing sub-branch of holography used to make holographic elements (HOE) to focus, split, and scan, and control laser light in optical devices like the typical CD player.
Holograms are designed to display different images and patterns. These include:
are 2D image appears on the plane of the hologram. It has only two dimensions – breadth and length.
are 2D images but in layered forms, where at least one of the layers appears to be underneath or behind the other.
are images with three dimensions – depth, breadth, and length.
are created by recording multiple separate frames of a sequence of images to produce animation. The initial sequence can either be a computer or video graphics, movie footage, or photographic film.
Based on the appearance and origination methods, we can divide holograms into seven types. These include:
Fully-three dimensional images
Which clearly shows depth and the conventional graphic dimensions – width and height.
Which are made up of multiple images with each image in a separate viewing channel. This pattern makes it possible to see or superimpose a different image on another image when viewed from various viewing positions. There are three possible changes in image position here – rotate, tilt (backward/forward rocking movement), and flip (side to side movement).
Kinetic geometric designs and patterns
Which clearly shows the changes in color and movement.
Describe with engaging text
Type your ID card’s information in the text boxes that appear in your template. To change fonts or font styles and colors, highlight your text and make new selections from the color palettes and drop-down font menus.
Dot matrix (digital) Holograms
are hologram designs consisting of several pixels or tiny dots which are invisible to the ordinary eyes. Each pixel or dot is a distinct hologram, and when combined, produces a 3D or 2D image. You need a computerised origination system to create Dot matrix holograms. The system is designed to show only one pixel or dot at a time.
They are produced by using the very fine beam output from an electron beam generator to engrave the pattern on the recording medium. Contrary to what obtains during the recording the hologram in a photo-sensitive emulsion, e-beams help to create very high resolutions and complex designs.
Combination or Composite Holograms
They are made by combining different types of the hologram images above to create composite images. For instance, a multi-channel design of various forms can be achieved by combining a stereogram with a dot matrix.
Types of Security Tamper Proof
You can improve hologram sticker security by using pattern-released tamper-evident material, de-metalization, security slit, and serial numbers. You can also use special shape die-cutting to improve hologram sticker security.
Pressure Tamper Evident Hologram Sticker as a Middle-Level Security Material
Tamper-proof is also referred to as tamper-evident or pressure-sensitive. When you remove a tamper-proof holographic sticker, you get it damaged. You cannot remove a tamper-proof holographic image without destroying it, preventing it from being reused anymore.
High-Level Security Material: ORIGINAL Pattern Tamper Evident, VOID Pattern Release Tamper Evident, and Honeycomb Pattern Release Tamper Evident
When you remove pattern release tamper evident holographic labels, they leave behind ORIGINAL, VOID, and Honeycomb shape words. You can customize design word or image residue separately from the aluminum layer. When you release overprint holographic stickers, they will leave behind words or images in black, red, and other colors.
High-Level Security in Transparent Tamper Evident Transparent Hologram & VOID Transparent Tamper Proof
A transparent holographic sticker is a see-through security holographic label. There are VOID tamper-evident, tamper-proof, or non-tamper proof transparent holographic sticker. They prevent forgeries, photocopying, and see-through document view.
Non-Pressure Tamper Evident Hologram Sticker
When you tear a non-pressure tamper-evident holographic sticker from a surface, the image won’t be damaged whether it is pasted on glass, paper, or plastic card. The non-tamper proof hologram sticker is famously used as a textile tag or washable label.
Transparent holographic ID Card Overlays as well as Transparent Hologram Decal for Mobile Screen
Using a transparent hologram film on a digital ID card will protect the ink from excessive wear, tear, and abrasion. This protection extends the life of the ID card life and improves its security deals. The holographic overlay on the ID card prevents one from altering the ID card information and prevents duplicating or tampering with the ID card. The overlays come as peel and stick transparent labels that you fix manually after printing the ID card. The overlay size is slightly less than the standard ID card.
Clear ID Holograms made to protect ID cards against fake copying and Identifications
Transparent ID holograms don’t tamper with the image on the ID card. ID Holograms are created with a size that fits ID Cards. They are sensitive to pressure and self-adhesive. Once you remove the paper, you can stick the ID Hologram on your ID cards. Other forms of Transparent Hologram Security include Transparent Hologram Sticker, VOID Transparent Tamper Proof, Transparent Hologram Pouch, and Transparent Hologram Decal for Mobile device screens.
How to Covert Hidden Text in Laser and Moire hologram sticker
A hidden image or text contains encrypted data that you cannot see except with the use of a pocket reader. A laser hidden (readable) text is viewable using a laser pointer or laser reader.
To read a Morie hidden sticker, you need to cover the encoded portion of the holographic sticker with decode film. You can find security features like multilevel CRL and high-security dynamic CLR and incorporate them to read hidden text or images in hologram.
Understanding Nano text, Micro Text or Image in hologram labels, concealed images, and other obvious security details
It is difficult to see micro text or micro image in the holographic label is with your naked eye. To visually inspect it, you need a microscope or magnifier and microscope. Nano text features a smaller font than micro text.
To get a good look, a security Flash Light, speckle effect, random interference fringes, or matt color offers the best security.