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edited by Sima Mousavi
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To version 6.3
edited by Sima Mousavi
on 2024/01/29 13:13
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Summary

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1 -Distributed Acoustic Sensing
1 +Distributed Acoustic Sensing (DAS)
Content
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1 -=== SmartSolo Node Types and Procedures ===
1 += **DAS Data Collection System** =
2 2  
3 -**SmartSolo Node Variants:**
3 +==== **1. Interrogator Unit** ====
4 4  
5 -* **SmartSolo IGU 16HR 3C (5 Hz) Short Period Node**: Designed for capturing higher frequency seismic data.
6 -* **SmartSolo BD3C-5 (5-second) Broad-Band Node**: Ideal for broader frequency range, including lower frequencies.
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.
7 7  
8 -**Procedures for Installation, Demobilization, and Data Download**:
9 +==== **2. Surface Installation** ====
9 9  
10 -* (((
11 -The installation, demobilization, and data downloading procedures for both types of SmartSolo nodes – the IGU 16HR 3C Short Period Node and the BD3C-5 Broad-Band Node – are largely similar.
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.
12 12  
13 -This uniformity in process ensures ease of operation across different node types, allowing for a streamlined approach in fieldwork and data management.
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.
14 14  )))
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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263 +[[How to clean the optical connector>>image:1706488909085-143.png||alt="How to clean the optical connector"]]
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