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What is the numerical aperture? Explain the use of optical fibre in temperature sensor.
written 5.3 years ago by gravatar for vermavarsha432 vermavarsha432 • 1000 modified 4.1 years ago by gravatar for sanketshingote sanketshingote • 100

The core diameter of a multimode step index fibre is 50 μm. The numerical aperture is 0.25. calculate the number of guided modes at an operating wavelength of 0.75 μm.
advanced engineering physics
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written 5.2 years ago by gravatar for vermavarsha432 vermavarsha432 • 1000

The numerical aperture(NA) is defined as the sine of the acceptance angle.It determines the light gathering ability of the fibre. It is a measure of the amount of light that can be accepted by a fibre. enter image description here

where α is the maximum angle of incidence for which total internal reflection can …

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