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Last modified by robert on 2024/05/17 16:52
From version 6.1
edited by Sima Mousavi
on 2024/01/29 11:39
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To version 6.3
edited by Sima Mousavi
on 2024/01/29 13:13
Change comment: There is no comment for this version

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1 -=== **Silixa iDAS Setup Manual for Reoccupying/Duplicating Experiment** ===
1 += **DAS Data Collection System** =
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 +
3 3  ----
4 4  
5 -==== **General Information** ====
36 +=== ===
6 6  
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 +
7 7  * **Experiment Name:** ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~__
8 8  * **Local Date:** ~_~_~_~_/~_~__**/202**
9 9  * **Local Time:** ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~__
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152 -[[image:https://photos.fife.usercontent.google.com/pw/ABLVV87kSOUibG3z-j2KEZVZsK3whKaKTz3HMBd9NH_QQycwFx_2vZ7-koa-0g=w4000-h2252-s-no-gm?authuser=0]]
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154 154  [[image:1706488566274-805.png]]
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256 +[[Caption>>image:1706488806394-168.png]]
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161 161  [[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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