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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
Q
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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
Q
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15
Q

what is Modal birefringence

A
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16
Q
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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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A
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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
A
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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
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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
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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
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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
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88
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89
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90
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91
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92
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93
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94
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95
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96
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97
Q

What is NA?

A
98
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A
99
Q
A
100
Q
A
101
Q

what is a CCL

A
102
Q

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

A
103
Q

what is the nominal ocular hazard distance

A
104
Q
A
105
Q
A
106
Q
A
107
Q

what is a pump down assembly

A
108
Q
A
109
Q

what is a walkaway VSP

A
110
Q
A
111
Q

describe the refractive index profile for single mode and multimode fibers

A
112
Q
A
113
Q

what is a wireline pressure control flange

A
114
Q

what is pulse width

A
115
Q
A
116
Q
A
117
Q
A
118
Q

what is a pump-in sub

A
119
Q
A
120
Q
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121
Q
A
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.

A
123
Q

what is IOR

A

optical index of refraction

124
Q
A
125
Q
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126
Q
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127
Q

what are the 3 types of backscattered photons

A
128
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129
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130
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131
Q
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132
Q
A
133
Q

What is “V number”

A
134
Q
A
135
Q

what is a quick connect sub

A
136
Q
A

optical power

137
Q
A
138
Q

describe bedding plane slip

A
139
Q
A
140
Q

what is the effective index

A
141
Q

what is the definition of poroelasticity

A
142
Q
A
143
Q
A
144
Q

what are the advantages to multimode fiber

A
145
Q
A
146
Q
A
147
Q

what is a cable head

A
148
Q
A
149
Q

what is a TEC cable

A

tubing Encapsulated cable

150
Q

what are fiber modes

A
151
Q

what is cutoff

A
152
Q
A
153
Q

what is a grease injector head

A
154
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A
155
Q
A
156
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A
157
Q
A
158
Q
A
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

A
161
Q
A
162
Q
A
163
Q

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

A
164
Q

what is phase velocity

A
165
Q
A
166
Q

what is an LAS file

A
167
Q
A
168
Q

what is a multiplexer

A
169
Q
A
170
Q

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

A
171
Q
A
172
Q
A
173
Q
A
174
Q

what is Group birefringence

A
175
Q
A
176
Q

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

A
177
Q
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178
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179
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180
Q
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181
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182
Q
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183
Q
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184
Q
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185
Q
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186
Q
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187
Q

what is a tool trap

A
188
Q
A
189
Q

•The intensity of the _____ band is temperature sensitive.

A
190
Q
A
191
Q
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192
Q

what is attenuation

A
193
Q
A
194
Q
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195
Q
A
196
Q
A
197
Q

what is band-pass filtered

A

only shows certain frequencies

198
Q

what is a pack-off sub

A
199
Q

what is the lubricator

A
200
Q
A
201
Q
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202
Q
A
203
Q
A
204
Q

The underlying principle of the ULTIMA DTS is ____ and _____

A
205
Q
A
206
Q
A
207
Q

what is a ball check valve

A
208
Q
A
209
Q

what is an optical circulator

A
210
Q
A
211
Q

what is a measuring head

A
212
Q

what is the spacial resolution of ULTIMA

A
213
Q
A
214
Q

Small form-factor pluggable transceiver

A
215
Q
A
216
Q
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217
Q
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218
Q

what is a mule shoe

A
219
Q

what is an SFP

A
220
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221
Q
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222
Q
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223
Q
A

Fiber basics (12 decks)

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