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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 5.1
edited by Sima Mousavi
on 2024/01/29 10:58
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1 -= **DAS Data Collection System** =
1 +=== **Silixa iDAS Setup Manual for Reoccupying/Duplicating Experiment** ===
2 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 34  ----
35 35  
36 -=== ===
5 +==== **General Information** ====
37 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 -
102 102  * **Experiment Name:** ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~__
103 103  * **Local Date:** ~_~_~_~_/~_~__**/202**
104 104  * **Local Time:** ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~__
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240 240  * Regularly check the condition of all cables and connectors.
241 241  * Before leaving the setup, confirm that data saving is active if required.
242 242  * 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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251 -[[image:1706488566274-805.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]]
260 -
261 -
262 -
263 -[[How to clean the optical connector>>image:1706488909085-143.png||alt="How to clean the optical connector"]]
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