What Is High Blood Pressure? Blood pressure is the amount of force exerted by the blood against the walls of the arteries. A person's blood pressure is considered high when the readings are greater than 140 mm Hg systolic (the top number in the blood pressure reading) or 90 mm Hg diastolic (the bottom number).
You are here: Fiber optic light source is a fiber optic test equipment to measure the fiber optic loss for both single mode fiber cable and multimode fiber cables; usually the fiber optic light source is used with the fiber optic power meters.
They do this by Total Internal Reflection. That's why optical fibers can guide light for such long distances-because the walls of the fibre don't absorb any light at all as long as the angle of incidence is greater than the critical angle. fibre optic cable is made from a glass core (or in cheaper lower grade ones-plastic) , that carries the light, surrounded by a glass cladding of lower refractive index, which reflects escaping light back into the core.