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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 -= **DAS Metadata Schema** =
35 -
36 -==== **1. Interrogator** ====
37 -
38 -* **Required:** Interrogator ID, manufacturer, model.
39 -* **Optional:** Serial number, firmware version.
40 -
41 -==== **2. Acquisition Parameters** ====
42 -
43 -* **Required:** Interrogator ID, acquisition ID, unit of measure, acquisition start and end time, acquisition sample rate, gauge length, number of channels, spatial sampling interval.
44 -* **Optional:** Pulse rate, pulse width.
45 -
46 -==== **3. Overview** ====
47 -
48 -* **Required:** Network code, location, start date, end date, point of contact.
49 -* **Optional:** Digital Object Identifier (DOI), purpose of data collection, funding agency.
50 -
51 -==== **4. Cable Information** ====
52 -
53 -* **Required:** Cable ID, cable bounding box.
54 -* **Optional:** Cable owner, cable installation date, cable characteristics.
55 -
56 -==== **5. Fiber Information ('Native format')** ====
57 -
58 -* **Required:** Cable ID, fiber ID, fiber geometry, fiber mode, fiber refraction index.
59 -* **Optional:** Fiber optical length, fiber start and end location, fiber one-way attenuation, fiber winding angle.
60 -
61 -==== **6. Channel Group** ====
62 -
63 -* **Required:** Interrogator ID, acquisition ID, channel group ID, cable ID, fiber ID, coordinate generation date.
64 -* **Optional:** Location method, coordinate reference frame, first/last usable channel ID, uncertainty of various coordinates (x, y, latitude, longitude, elevation, depth, strike, dip).
65 -
66 -==== **7. Channel** ====
67 -
68 -* **Required:** Channel group ID, channel ID, coordinates (x, y, latitude, longitude).
69 -* **Optional:** Elevation above sea level, depth below surface, distance along fiber, strike, dip.
70 -
71 -----
72 -
73 -=== ===
74 -
75 -= **Pre-processing Steps for DAS Data (2.5 months, 90 TB)** =
76 -
77 -1. (((
78 -**Create a Deployment Log**
79 -
80 -* Document key details like photonics settings, duration of data collection, instances of hard disk failure, power outages, etc.
81 -)))
82 -1. (((
83 -**Generate Geographic Coordinates**
84 -
85 -* Assign latitude and longitude coordinates to each DAS channel for spatial referencing.
86 -)))
87 -1. (((
88 -**Data Conversion**
89 -
90 -* Convert the raw DAS time series data from counts to strain rate, which is more meaningful for seismic analysis.
91 -)))
92 -1. (((
93 -**Data Decimation**
94 -
95 -* 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.
96 -)))
97 -1. (((
98 -**Extract Specific Time Series**
99 -
100 -* Isolate time series data of special interest, such as those related to earthquake events, for detailed analysis.
101 -)))
102 -1. (((
103 -**Data Hosting**
104 -
105 -* Store the processed data on Research School of Earth Sciences (RSES) clusters and the National Computational Infrastructure (NCI) for accessibility and further analysis.
106 -)))
107 -1. (((
108 -**Extract Data and Instrument Response from Seismic Nodes**
109 -
110 -* Retrieve both the raw data and the corresponding instrument response characteristics for accurate interpretation of the seismic signals.
111 -)))
112 -1. (((
113 -**Long-term Archiving and Data Sharing**
114 -
115 -* 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.
116 -)))
117 -1. (((
118 -**Data Access and Record Keeping**
119 -
120 -* 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.
121 -)))
122 -
123 -=== ===
124 -
125 -=== ===
126 -
127 -=== ===
128 -
129 -=== ===
130 -
131 -=== ===
132 -
133 -----
134 -
135 -= **Silixa iDAS Setup Manual for Reoccupying/Duplicating Experiment** =
136 -
137 -= **General Information** =
138 -
139 -* **Experiment Name:** ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~__
140 -* **Local Date:** ~_~_~_~_/~_~__**/202**
141 -* **Local Time:** ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~__
142 -* **Personnel:** ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_
143 -* **Site Condition Notes:**
144 -** [Space for detailed notes about the site condition, any upkeep performed, and changes made since the last visit.]
145 -
146 -----
147 -
148 -==== **Setup Procedure** ====
149 -
150 -1. (((
151 -**Open iDAS Box**
152 -
153 -* Serial Number: ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~__
154 -* IP Address: ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_
155 -)))
156 -1. (((
157 -**Check Laser Lock**
158 -
159 -* Ensure the lever on the LASER/RIGHT side of the iDAS is in the locked position (LEVER UP).
160 -)))
161 -1. (((
162 -**Placement of iDAS**
163 -
164 -* Position the iDAS on a stable surface.
165 -* Ensure clear air flow around the fan vents.
166 -)))
167 -1. (((
168 -**UPS Setup** (If applicable)
169 -
170 -* Connect the UPS to a power source.
171 -* Plug the NAS into the UPS using the special cable with a rectangular connector.
172 -* Connect the monitor to the UPS.
173 -)))
174 -1. (((
175 -**Peripheral Connections**
176 -
177 -* Connect a computer monitor, mouse, and keyboard to the iDAS.
178 -)))
179 -1. (((
180 -**GPS Antenna Connection**
181 -
182 -* Connect the GPS antenna to the left-side socket on the front of the iDAS using a special adapter.
183 -)))
184 -1. (((
185 -**Fibre Optic Connection**
186 -
187 -* Clean both the fibre optic cable and the socket with a 1-click cleaner before connection.
188 -* Use the guide/tip for cleaning the fibre and clean the socket without it.
189 -)))
190 -1. (((
191 -**Powering the iDAS**
192 -
193 -* Connect the iDAS to a power socket or UPS.
194 -* Note: The iDAS turns on automatically when connected to power. Use the power button at the bottom left if it does not.
195 -)))
196 -1. (((
197 -**Network Drive Mapping**
198 -
199 -* Open File Explorer and select 'This PC' from the left pane.
200 -* On the File Explorer ribbon, select 'More' > 'Map network drive'.
201 -* Choose a drive letter from the 'Drive' list.
202 -)))
203 -1. (((
204 -**Open iDAS Software**
205 -
206 -* Use the link/shortcut on the Desktop.
207 -)))
208 -1. (((
209 -**GPS Satellite Confirmation**
210 -
211 -* Check for a green light in the top row of the software interface indicating GPS satellite detection.
212 -)))
213 -1. (((
214 -**Lever/Interlock Adjustment**
215 -
216 -* Lower the lever/interlock (as mentioned in step 2) before starting data acquisition.
217 -)))
218 -1. (((
219 -**Configuration File Duplication**
220 -
221 -* Use 'current.cfg' for duplicating previous setup.
222 -* The file is located at C:/Silixa/Data/current.cfg.
223 -* Copy this file to the desktop and save it with a new filename.
224 -)))
225 -1. (((
226 -**iDAS Configuration Settings**
227 -
228 -* Navigate to the 'Configuration' tab and click 'iDAS configuration'.
229 -* Check all values under 'system'.
230 -* Under 'application', enable error messages.
231 -* In 'saving', select 'acoustic saving', choose 'tdms', and set the file save location and identifier.
232 -* Leave default parameters in 'measure'.
233 -)))
234 -1. (((
235 -**Mode Selection**
236 -
237 -* Toggle between Acoustic mode, Waterfall mode, and OTDR mode to check data recording.
238 -)))
239 -1. (((
240 -**Photograph OTDR Mode**
241 -
242 -* Document the OTDR mode settings with a photograph.
243 -)))
244 -1. (((
245 -**Photograph Waterfall Mode**
246 -
247 -* Similarly, take a picture of the Waterfall mode settings.
248 -)))
249 -1. (((
250 -**Configuration File Saving**
251 -
252 -* Save the configuration file in .cfg format in a separate location without overwriting the existing one.
253 -)))
254 -1. (((
255 -**Software Check**
256 -
257 -* Ensure QFinder, Teamviewer, and Microsoft Remote Desktop are installed.
258 -)))
259 -1. (((
260 -**Remote Access Setup**
261 -
262 -* Open Teamviewer or Microsoft Remote Desktop.
263 -* For Teamviewer, photograph the ID and password and ensure it remains open.
264 -* For Microsoft Remote Desktop, record the IP address and test remote access with a separate laptop.
265 -)))
266 -1. (((
267 -**Final Mode Setting**
268 -
269 -* Switch to OTDR mode for ongoing operation (avoids excessive memory usage of Waterfall mode).
270 -)))
271 -
272 -----
273 -
274 -==== **Important Reminders** ====
275 -
276 -* Always ensure that the iDAS is connected to a suitably earthed power socket or UPS for safety.
277 -* Regularly check the condition of all cables and connectors.
278 -* Before leaving the setup, confirm that data saving is active if required.
279 -* Keep a log of all actions taken during the setup for future reference and troubleshooting.
280 -
281 -
282 -
283 -
284 -[[image:1706489800616-982.png]]
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296 -[[image:https://photos.fife.usercontent.google.com/pw/ABLVV86phmYsze0lp1yzL-gs6stE23rmgKbOxcpCRhFmK9s25zf5UHBkgbFcOg=w1440-h2556-s-no-gm?authuser=0]]
297 -
298 -
299 -
300 -[[How to clean the optical connector>>image:1706488909085-143.png||alt="How to clean the optical connector"]]
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302 -
303 -
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