FAQs
Display Holograms
The term display hologram is usually used to describe large, single holograms for use in shop windows, bars, exhibitions, universities, trade shows and other places where an eye-catching single piece is required.
They can either be transmission or reflection holograms. The two most common sizes are 30cm X 40 cm and 50 cm X 60 cm. These reflect the sizes in which the holographic material is supplied from the manufacturer. Larger film is available which is 1 metre wide by 10 metres long. For this reason, the largest holograms that can be made from a single piece of film is about 1 metre square. Generally, this type of hologram uses real objects or real people as the subject. Natural subjects work very well. Their intrinsic complexity is shown in very fine detail using this type of holography.
Product shots are done in a similar way. The constraints are very similar to those of a normal photographic studio. The scale is 1:1. If a hologram of a mouse were required, the holographic plate would need to be about six inches square. If a portrait is to be made, a 30cm X 40cm plate would cover the head and shoulders of the sitter.
Using a Pulse laser, a single shot produces a three-dimensional image. Moving sub- jects such as bullets and birds in flight can be captured, as the pulse of light is extremely short.
More than one image can be made on a holographic plate. For example, two objects could occupy the same volume, or the image could change as the viewer moved from left to right. The latter is known as a multi channel hologram. When entering into production of a display hologram, there are certain common activities in the process. Consultation with the client will concentrate on what the hologram has to achieve. This is down to the hologram design. This usually involves a visit to the site and discussions as to the purpose of the hologram. Normally a set of two-dimensional visuals will be produced to start the production process. These will take into consideration location and size of the hologram. Ambient light conditions are important, as is the angle of view.
Special consideration must be given as to whether the hologram receives any direct sunlight. It is strongly recommended that the hologram be placed in a position that avoids direct sunlight. The hologram will usually be illuminated by a ceiling mounted tungsten halogen spot light. Powers are available between 25 and 75 watts. A 50 W bulbs usually sufficient.
