shell text Flashcards

1
Q

what is the equation to determine the lenth of a light pulse

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2
Q

what is the temperature equation

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3
Q

temperature standard deviation will increase with _____ even if the standard deviation of the Raman signals are constant.

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4
Q

Except for certain special quality control tests, the _______ signal is usually filtered and suppressed.

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5
Q

what is Tref and T0

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6
Q

what is a graded index

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7
Q

red shift is a _____ in wavelength and blue shift is a ______ in wavelength

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8
Q

When that pulse enters the fiber, it is said to be _____

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9
Q

what are the accuracy and resolution definitions and differences

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10
Q

If the sensitivity is known, the observed temperature
log is made up sum of three components:

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11
Q

what is Snell’s Law

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12
Q

The Raman signal is the signal used for evaluation of temperature. It is sufficiently strong and has a unique temperature dependence. Its wavelength is also shifted substantially (about ____/Nm) from the main Rayleigh peak,
thereby allowing the dominant Rayleigh and Brillouin peaks to be filtered out

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13
Q

The refractive index of the core is approximately
___% greater than the cladding thereby
assuring the containment of the laser light pulse
within the core.

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14
Q

why do most DTS measurements use multimode fiber

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15
Q

what does water do to fiber

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16
Q

What is the equation to determine window size required to achieve a one meter length resolution along the fiber

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17
Q

Laser pulses are directed to the fiber line by
means of a directional coupler. The fiber optic line then passes through a(n) ______ before going into the fiber

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18
Q

______ laser pulses and smaller time
windows are required to better detect short length high temperature nanomalies.

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19
Q

Those waves associated with the lattice vibrations show up as _____ lines or peaks on the backscatter spectrum.

20
Q

the stokes and antistokes signals signal on the backscatter vary because

21
Q

Total internal reflection is based on what law

22
Q

what is the equation for overstuff of the fiber caused by its own weight

23
Q

what is the refractive index

24
Q

a DTS system’s resolution should be stated in terms of fiber ____ and _____.

25
what is the Beer-Lambert law
26
what is the equation for overstuff
27
28
what is the sampling resolution
29
what is optical overstuff
30
what are the x and y axis for a typical Optical Time Domain Reflectometry (OTDR) graph
31
Resolution can be expressed as \_\_\_\_\_\_ of the temperature measurement
32
If the velocity of light in the fiber is v, a \_\_\_\_can be opened at some time t to capture that backscattered light.
33
what are two definitions of spacial resolution
34
For singlemode fiber, longer distances requires ____ and \_\_\_\_\_
35
The main backscattered wave is at the wavelength of the launched wave and is called the ____ peak or band. This is by far the _____ signal returned.
36
how is the speed of light in a fiber determined
37
During backscattering, the energized lattice and molecules then give off light having wavelengths at _______ the incident wave.
38
This light pulse is, in effect, a travelling ____ moving through the fiber line and relaying back temperature information
39
how is differential loss determined in a DTS wrap back
40
how long is the lightpulse to measure the fiber
41
the weakest of the backscattered waves, resulting from molecular and atomic vibrations, are the \_\_\_\_Bands
42
laser pulses are directed to the fiber line by means of a \_\_\_\_\_\_\_\_\_.
43
Optical Time Domain Reflectometry (OTDR) is used to access what and with what type of wave
44
what is the equation for the energy of the returning Ramen backscatter
45
what is cone of acceptance
46
what doe attenuation mean
the reduction of the force, effect, or value of something