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Version 6.3 by Sima Mousavi on 2024/01/29 13:13
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1 = **DAS Data Collection System** =
2
3 ==== **1. Interrogator Unit** ====
4
5 * **Function:** The interrogator unit is the core component of a DAS system. It sends laser pulses through the optical fiber and measures the backscattered light.
6 * **Recording Information:** It records various settings such as the optical system configurations, spatial sampling rates, and the duration of data acquisition.
7 * **Multiple Interrogators:** More than one interrogator may be used in an experiment. Each unit should have a unique identifier and is described in its respective metadata block.
8
9 ==== **2. Surface Installation** ====
10
11 * **Cable Arrangement:** The optical fiber cable can be a single long continuous cable or multiple cables with connectors, used across different installation environments.
12 * **Cable Types:** Cables may vary in construction types based on the installation environment.
13 * **Geographical Metadata:** Parameters related to geographical location are specified for easy searchability in databases.
14
15 ==== **3. Fiber Optic Cable** ====
16
17 * **Cable Composition:** Several optical fibers may be enclosed within one cable.
18 * **Metadata Identification:** The metadata identifies each individual fiber used in the acquisition, including its intrinsic properties.
19
20 ==== **4. Installation Environments** ====
21
22 * **Shallow Burial:** The cable can be shallowly buried.
23 * **In-Conduit Installation:** The cable can also be installed within a conduit.
24 * **Water Installation:** Suitable for underwater environments.
25
26 ==== **5. Channels** ====
27
28 * **Sensor Distribution:** Channels represent sensors distributed along the fiber array at fixed intervals.
29 * **Physical Location Determination:** The physical locations of these channels are ascertainable through methods like tap tests and GPS tracking.
30 * **Metadata for Channels:** Each channel or group of channels has its own metadata block, detailing specifics like location and properties.
31
32 === ===
33
34 ----
35
36 === ===
37
38 = **Pre-processing Steps for DAS Data (2.5 months, 90 TB)** =
39
40 1. (((
41 **Create a Deployment Log**
42
43 * Document key details like photonics settings, duration of data collection, instances of hard disk failure, power outages, etc.
44 )))
45 1. (((
46 **Generate Geographic Coordinates**
47
48 * Assign latitude and longitude coordinates to each DAS channel for spatial referencing.
49 )))
50 1. (((
51 **Data Conversion**
52
53 * Convert the raw DAS time series data from counts to strain rate, which is more meaningful for seismic analysis.
54 )))
55 1. (((
56 **Data Decimation**
57
58 * Reduce the sampling rate from 1000 Hz to 100 Hz. This step is essential to manage data volume and focus on frequencies of interest for seismic activities.
59 )))
60 1. (((
61 **Extract Specific Time Series**
62
63 * Isolate time series data of special interest, such as those related to earthquake events, for detailed analysis.
64 )))
65 1. (((
66 **Data Hosting**
67
68 * Store the processed data on Research School of Earth Sciences (RSES) clusters and the National Computational Infrastructure (NCI) for accessibility and further analysis.
69 )))
70 1. (((
71 **Extract Data and Instrument Response from Seismic Nodes**
72
73 * Retrieve both the raw data and the corresponding instrument response characteristics for accurate interpretation of the seismic signals.
74 )))
75 1. (((
76 **Long-term Archiving and Data Sharing**
77
78 * Ensure that the data is archived in a format and location that supports long-term preservation and accessibility, such as the AuScope Distributed Acoustic Sensing (DAS) Collection.
79 )))
80 1. (((
81 **Data Access and Record Keeping**
82
83 * Maintain records and access paths (e.g., NCI local file path) for the data, including metadata and other associated records, to facilitate future research and data sharing.
84 )))
85
86 === ===
87
88 === ===
89
90 === ===
91
92 === ===
93
94 === ===
95
96 ----
97
98 = **Silixa iDAS Setup Manual for Reoccupying/Duplicating Experiment** =
99
100 = **General Information** =
101
102 * **Experiment Name:** ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~__
103 * **Local Date:** ~_~_~_~_/~_~__**/202**
104 * **Local Time:** ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~__
105 * **Personnel:** ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_
106 * **Site Condition Notes:**
107 ** [Space for detailed notes about the site condition, any upkeep performed, and changes made since the last visit.]
108
109 ----
110
111 ==== **Setup Procedure** ====
112
113 1. (((
114 **Open iDAS Box**
115
116 * Serial Number: ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~__
117 * IP Address: ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_
118 )))
119 1. (((
120 **Check Laser Lock**
121
122 * Ensure the lever on the LASER/RIGHT side of the iDAS is in the locked position (LEVER UP).
123 )))
124 1. (((
125 **Placement of iDAS**
126
127 * Position the iDAS on a stable surface.
128 * Ensure clear air flow around the fan vents.
129 )))
130 1. (((
131 **UPS Setup** (If applicable)
132
133 * Connect the UPS to a power source.
134 * Plug the NAS into the UPS using the special cable with a rectangular connector.
135 * Connect the monitor to the UPS.
136 )))
137 1. (((
138 **Peripheral Connections**
139
140 * Connect a computer monitor, mouse, and keyboard to the iDAS.
141 )))
142 1. (((
143 **GPS Antenna Connection**
144
145 * Connect the GPS antenna to the left-side socket on the front of the iDAS using a special adapter.
146 )))
147 1. (((
148 **Fibre Optic Connection**
149
150 * Clean both the fibre optic cable and the socket with a 1-click cleaner before connection.
151 * Use the guide/tip for cleaning the fibre and clean the socket without it.
152 )))
153 1. (((
154 **Powering the iDAS**
155
156 * Connect the iDAS to a power socket or UPS.
157 * Note: The iDAS turns on automatically when connected to power. Use the power button at the bottom left if it does not.
158 )))
159 1. (((
160 **Network Drive Mapping**
161
162 * Open File Explorer and select 'This PC' from the left pane.
163 * On the File Explorer ribbon, select 'More' > 'Map network drive'.
164 * Choose a drive letter from the 'Drive' list.
165 )))
166 1. (((
167 **Open iDAS Software**
168
169 * Use the link/shortcut on the Desktop.
170 )))
171 1. (((
172 **GPS Satellite Confirmation**
173
174 * Check for a green light in the top row of the software interface indicating GPS satellite detection.
175 )))
176 1. (((
177 **Lever/Interlock Adjustment**
178
179 * Lower the lever/interlock (as mentioned in step 2) before starting data acquisition.
180 )))
181 1. (((
182 **Configuration File Duplication**
183
184 * Use 'current.cfg' for duplicating previous setup.
185 * The file is located at C:/Silixa/Data/current.cfg.
186 * Copy this file to the desktop and save it with a new filename.
187 )))
188 1. (((
189 **iDAS Configuration Settings**
190
191 * Navigate to the 'Configuration' tab and click 'iDAS configuration'.
192 * Check all values under 'system'.
193 * Under 'application', enable error messages.
194 * In 'saving', select 'acoustic saving', choose 'tdms', and set the file save location and identifier.
195 * Leave default parameters in 'measure'.
196 )))
197 1. (((
198 **Mode Selection**
199
200 * Toggle between Acoustic mode, Waterfall mode, and OTDR mode to check data recording.
201 )))
202 1. (((
203 **Photograph OTDR Mode**
204
205 * Document the OTDR mode settings with a photograph.
206 )))
207 1. (((
208 **Photograph Waterfall Mode**
209
210 * Similarly, take a picture of the Waterfall mode settings.
211 )))
212 1. (((
213 **Configuration File Saving**
214
215 * Save the configuration file in .cfg format in a separate location without overwriting the existing one.
216 )))
217 1. (((
218 **Software Check**
219
220 * Ensure QFinder, Teamviewer, and Microsoft Remote Desktop are installed.
221 )))
222 1. (((
223 **Remote Access Setup**
224
225 * Open Teamviewer or Microsoft Remote Desktop.
226 * For Teamviewer, photograph the ID and password and ensure it remains open.
227 * For Microsoft Remote Desktop, record the IP address and test remote access with a separate laptop.
228 )))
229 1. (((
230 **Final Mode Setting**
231
232 * Switch to OTDR mode for ongoing operation (avoids excessive memory usage of Waterfall mode).
233 )))
234
235 ----
236
237 ==== **Important Reminders** ====
238
239 * Always ensure that the iDAS is connected to a suitably earthed power socket or UPS for safety.
240 * Regularly check the condition of all cables and connectors.
241 * Before leaving the setup, confirm that data saving is active if required.
242 * Keep a log of all actions taken during the setup for future reference and troubleshooting.
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247 [[image:1706489800616-982.png]]
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256 [[Caption>>image:1706488806394-168.png]]
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259 [[image:https://photos.fife.usercontent.google.com/pw/ABLVV86phmYsze0lp1yzL-gs6stE23rmgKbOxcpCRhFmK9s25zf5UHBkgbFcOg=w1440-h2556-s-no-gm?authuser=0]]
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263 [[How to clean the optical connector>>image:1706488909085-143.png||alt="How to clean the optical connector"]]
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