Define and explain numerical aperture, Electrical Engineering

Assignment Help:

Define and explain Numerical aperture?

Figure shown below shows an incident ray to the fibre,

905_numerical aperture.png

The light bends at two interfaces, one at the air- core interface and the other is the core cladding interface.
At the first interface, we can write
n sin O0 = n1 sin O ---------(1)
but minimum value of Ø is Øc where Ømax = 90 - Øc, then (1) becomes
n sin Omax = n1 sin Ømax = n1 sin (90 - Øc)
n sin Omax = n1 cos Øc.............(2)
at the second interface, we can write
n1 sin Oc = n2 sin 90
sin Oc = n2/n1 ........(3)
therefore cos Oc = (1- sin2 Oc)1/2
cos Oc = [1- (n1/n2)2]1/2
(2) becomes
n sin Omax = (n12 - n22)1/2
this is called numerical aperture (NA) of the fibre.
NA = (n12 - n22)1/2


Related Discussions:- Define and explain numerical aperture

Lhld load hl pair direct instruction, LHLD  Load  HL Pair Direct  Instru...

LHLD  Load  HL Pair Direct  Instruction This  instruction is used to copy the  content  of memory  location specified  by opened  in register L  and copy the content of next  m

Ral rotate accumulator left through carry instruction , RAL Rotate Accumula...

RAL Rotate Accumulator Left Through Carry Instruction This  instruction rotates the content  of the accumulator  towards left by one bit. The D 0 bit moves to D 1   bit moves

Illustrate gray code, (a) In the so-called folded binary code of 4 bits, th...

(a) In the so-called folded binary code of 4 bits, the left most digit represents the sign of an analog signal's quantized samples (with 0 for negative and 1 for positive), and the

Interpretation and analysis using remote sensing, Q. Interpretation and ana...

Q. Interpretation and analysis using remote sensing? Interpretation and analysis using remote sensing Various characteristics of a river can be understood by studying its planf

Fixed bias, Fixed bias (base bias): Diagram: Fixed bias (Base ...

Fixed bias (base bias): Diagram: Fixed bias (Base bias) This type of biasing is also known as  base bias . In the instance above figure, the single power source (

Determine maximum length for cable, You have been asked to help on the desi...

You have been asked to help on the design of CDU's new electric vehicle. The vehicle is to be powered by a 96V, 300A battery pack and you need to decide on the maximum length you c

Explain the terms dielectric constant and dielectric loss, Explain the term...

Explain the terms dielectric constant and dielectric loss. Dielectric Constant or Permittivity: all insulating materials possess an electrical capacitance. The capacitance of

Process , Process The rectangle symbol  is used to represent  the pro...

Process The rectangle symbol  is used to represent  the process  operations as shown below.   MOV A, B

Simulate a diode application circuit using multisim ewb, a. Simulate a diod...

a. Simulate a diode application circuit using Multisim EWB.  Compare calculated and simulated results Each student must choose one of the following circuits from question 1 (Ref

Explain the architecture of ss7, Q. explain the architecture of SS7 and com...

Q. explain the architecture of SS7 and compare with seven-layer OSI architecture. Ans: A block schematic diagram of CCITT no. 7 signalling system is displayed in figure. Sig

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd