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Fiber basics > basics > Flashcards

basics Flashcards

1
Q

what is an OTDR

A

optical time domain reflectometer

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2
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3
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4
Q

what is HFM

A

strain hydraulic fracture monitoring

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5
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6
Q

what does iDAS stand for

A

intelligent DAS

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7
Q

what is modal dispersion

A
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8
Q

how does the OTDR work

(optical time domain reflectometer)

A
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9
Q

what is a wireline valve

A
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10
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11
Q

Light is confined inside the optical fibre thanks to _______

A
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12
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13
Q

what is Δα.

A
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14
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15
Q

what is Modal birefringence

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16
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17
Q

what is group velocity

A
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18
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19
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20
Q

what does DAS measure (short version)

A

measures the rate of change of strain in the fiber or strain rate

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21
Q

what is chromatic dispersion

A
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22
Q

what are the 2 types of refractive index profiles

A
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23
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24
Q

what is the definition of RMS

A
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25
Q

what are the advantages of using graded-index fiber versus single-index fiber

A
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26
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27
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28
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29
Q

what is mode area

A
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30
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31
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32
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33
Q

what is the definition of bandwith

A
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34
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35
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36
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37
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38
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39
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40
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41
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42
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43
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44
Q

Stokes and anti-Stokes signals experience _____ losses.

A
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45
Q

what is the equation of NA

A
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46
Q

what is a line-wiper

A
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47
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48
Q

what is a quick test sub

A
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49
Q

what are the most common materials used in fiber optics

A
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50
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51
Q

It is important to note that fiber sensitivity to a p-wave arrival is greatest at angles of incidence near ____ or in the direction parallel to the fiber. Note that for shear waves, the particle motion is perpendicular to the direction of travel of the wave. This means that the sensitivity to shear waves within the fiber is greatest for angles of incidence close to ______ degrees or perpendicular to the stimulation

A
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52
Q
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53
Q

what is the temperature resolution of ULTIMA

A
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54
Q

what is the range of ULTIMA

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55
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56
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57
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58
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59
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60
Q
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61
Q

what is FIMT

A

fiber in metal tube

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62
Q
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63
Q
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64
Q

•The temperature resolution degrades _____ over distance. This is caused by the _________.

A
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65
Q
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66
Q

what are 3 advantages and disadvanteges to fiber VSP

A
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67
Q

what does RAID stand for

A
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68
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69
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70
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71
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72
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73
Q
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74
Q

what’s the difference between temperature accuracy and resoluiton

A
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75
Q
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76
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77
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78
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79
Q
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80
Q

what is an offset VSP

A
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81
Q
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82
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83
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84
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85
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86
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87
Q
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88
Q
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89
Q
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97
Q

What is NA?

101
Q

what is a CCL

102
Q

•Loss occurs because a small portion of forward propagating light is_________

103
Q

what is the nominal ocular hazard distance

107
Q

what is a pump down assembly

109
Q

what is a walkaway VSP

111
Q

describe the refractive index profile for single mode and multimode fibers

113
Q

what is a wireline pressure control flange

114
Q

what is pulse width

118
Q

what is a pump-in sub

122
Q

How low is the optical fibre attenuation?

Typical singlemode fibres halve the signal power every ___km

Typical ADSL copper wire lines halve the signal power every 250m at 1MHz carrier frequency.

123
Q

what is IOR

A

optical index of refraction

127
Q

what are the 3 types of backscattered photons

133
Q

What is “V number”

135
Q

what is a quick connect sub

136
Q
A

optical power

138
Q

describe bedding plane slip

140
Q

what is the effective index

141
Q

what is the definition of poroelasticity

144
Q

what are the advantages to multimode fiber

147
Q

what is a cable head

149
Q

what is a TEC cable

A

tubing Encapsulated cable

150
Q

what are fiber modes

151
Q

what is cutoff

153
Q

what is a grease injector head

159
Q
  1. An APC reduces the risk of ________
A
  1. An APC reduces the risk of direct light reflection
160
Q

how is fiber das limited compared to a geophone

163
Q

how can you tell the differencet between the FC/PC and E2000 connectors

164
Q

what is phase velocity

166
Q

what is an LAS file

168
Q

what is a multiplexer

170
Q

what are the 2 advantages of fiber das VSP over geophone VSP

174
Q

what is Group birefringence

176
Q

Knowing the s______ one can map the temperature distribution to the fibre distance

187
Q

what is a tool trap

189
Q

•The intensity of the _____ band is temperature sensitive.

192
Q

what is attenuation

197
Q

what is band-pass filtered

A

only shows certain frequencies

198
Q

what is a pack-off sub

199
Q

what is the lubricator

204
Q

The underlying principle of the ULTIMA DTS is ____ and _____

207
Q

what is a ball check valve

209
Q

what is an optical circulator

211
Q

what is a measuring head

212
Q

what is the spacial resolution of ULTIMA

214
Q

Small form-factor pluggable transceiver

218
Q

what is a mule shoe

219
Q

what is an SFP

Fiber basics (12 decks)

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