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Last modified by robert on 2024/05/17 16:52
From version 6.3
edited by Sima Mousavi
on 2024/01/29 13:13
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To version 1.1
edited by robert
on 2023/12/06 20:14
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1 -Distributed Acoustic Sensing (DAS)
1 +Distributed Acoustic Sensing
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1 -XWiki.sima
1 +XWiki.robert
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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.
243 -
244 -
245 -
246 -
247 -[[image:1706489800616-982.png]]
248 -
249 -
250 -
251 -[[image:1706488566274-805.png]]
252 -
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255 -
256 -[[Caption>>image:1706488806394-168.png]]
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258 -
259 -[[image:https://photos.fife.usercontent.google.com/pw/ABLVV86phmYsze0lp1yzL-gs6stE23rmgKbOxcpCRhFmK9s25zf5UHBkgbFcOg=w1440-h2556-s-no-gm?authuser=0]]
260 -
261 -
262 -
263 -[[How to clean the optical connector>>image:1706488909085-143.png||alt="How to clean the optical connector"]]
264 -
265 -
266 -
267 -
268 -
269 -
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