Fibre Optic Cables
In 1954 a major breakthrough in technology occurred in the development of fibre optic cables. The principle of fibre optic cable was based on the total internal reflection of light. Light can be conducted along a curved glass rod due to multiple total internal reflections at the walls of the rod. Light would enter at one end of the fibre and emerge at the other end after numerous internal reflections with virtually all of its strength.
Now a day there is two types of light cable available in market.
1. Fiber Optic cable
2. Liquid crystal Gel cable
Optic cables
These cables are made up of a bundle of optical fibres glass thread swaged at both ends. The fibre size used is usually between 10 to 25 mm in diameter. They have a very high quality of optical transmission, but are fragile. In fact, progressively as they are used, some optical fibres break. The loss of optical fibres may be seen when one end of the cable is viewed in daylight. The broken fibres are seen as black spots
Gel cables
These cables are made up of a sheath that is filled with a clear optical gel. (Liquid crystal). Theoretically they are capable of transmitting 30% more light than optic fibres. Swaged at both ends by quartz. Due to more light and better color temperature transmission this cable is recommended in those circumstances where documentation (movie, photography or TV) is performed. They pose three problems:
· The quartz swaging at the ends is extremely fragile, especially when the cable is hot. The slightest shock, on a bench for example, can cause the quartz end to crack and thus cause a loss in the transmission of the light;
· These cables transmit more heat than optical fibre cables.
· These cables are made more rigid by a metal sheath, which makes them more difficult to maintain and to store.
In 1954 a major breakthrough in technology occurred in the development of fibre optic cables. The principle of fibre optic cable was based on the total internal reflection of light. Light can be conducted along a curved glass rod due to multiple total internal reflections at the walls of the rod. Light would enter at one end of the fibre and emerge at the other end after numerous internal reflections with virtually all of its strength.
Now a day there is two types of light cable available in market.
1. Fiber Optic cable
2. Liquid crystal Gel cable
Optic cables
These cables are made up of a bundle of optical fibres glass thread swaged at both ends. The fibre size used is usually between 10 to 25 mm in diameter. They have a very high quality of optical transmission, but are fragile. In fact, progressively as they are used, some optical fibres break. The loss of optical fibres may be seen when one end of the cable is viewed in daylight. The broken fibres are seen as black spots
Gel cables
These cables are made up of a sheath that is filled with a clear optical gel. (Liquid crystal). Theoretically they are capable of transmitting 30% more light than optic fibres. Swaged at both ends by quartz. Due to more light and better color temperature transmission this cable is recommended in those circumstances where documentation (movie, photography or TV) is performed. They pose three problems:
· The quartz swaging at the ends is extremely fragile, especially when the cable is hot. The slightest shock, on a bench for example, can cause the quartz end to crack and thus cause a loss in the transmission of the light;
· These cables transmit more heat than optical fibre cables.
· These cables are made more rigid by a metal sheath, which makes them more difficult to maintain and to store.
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