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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
Change comment: There is no comment for this version
To version 6.5
edited by Sima Mousavi
on 2024/01/29 14:36
Change comment: There is no comment for this version

Summary

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1 += **What is iDAS?** =
2 +
3 +**iDAS** stands for **Integrated Distributed Acoustic Sensing**. This advanced system utilizes the principle of Rayleigh backscattering in optical fibers to measure strain rates along the fiber's length. It's a cutting-edge technology predominantly used in fields like geophysics, where it's crucial for monitoring seismic activities, as well as in industrial applications like pipeline monitoring and security systems.
4 +
5 +=== **Safety first!**
6 + ===
7 +
8 +(% class="box warningmessage" %)
9 +The iDAS uses a Class 1 laser, which is generally considered safe for most applications. However, direct exposure to the eye should be avoided to prevent any risk of eye injury.
10 +\\Cables and fibers may create tripping hazards. Ensure that the routing of cables is done in a way that minimizes the risk of accidents.
11 +
12 +----
13 +
1 1  = **DAS Data Collection System** =
2 2  
3 3  ==== **1. Interrogator Unit** ====
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29 29  * **Physical Location Determination:** The physical locations of these channels are ascertainable through methods like tap tests and GPS tracking.
30 30  * **Metadata for Channels:** Each channel or group of channels has its own metadata block, detailing specifics like location and properties.
31 31  
32 -=== ===
33 33  
46 +[[image:1706489800616-982.png]]
47 +
48 +
49 +
50 +[[image:1706488566274-805.png]]
51 +
34 34  ----
35 35  
54 += **DAS Metadata Schema** =
55 +
56 +==== **1. Interrogator** ====
57 +
58 +* **Required:** Interrogator ID, manufacturer, model.
59 +* **Optional:** Serial number, firmware version.
60 +
61 +==== **2. Acquisition Parameters** ====
62 +
63 +* **Required:** Interrogator ID, acquisition ID, unit of measure, acquisition start and end time, acquisition sample rate, gauge length, number of channels, spatial sampling interval.
64 +* **Optional:** Pulse rate, pulse width.
65 +
66 +==== **3. Overview** ====
67 +
68 +* **Required:** Network code, location, start date, end date, point of contact.
69 +* **Optional:** Digital Object Identifier (DOI), purpose of data collection, funding agency.
70 +
71 +==== **4. Cable Information** ====
72 +
73 +* **Required:** Cable ID, cable bounding box.
74 +* **Optional:** Cable owner, cable installation date, cable characteristics.
75 +
76 +==== **5. Fiber Information ('Native format')** ====
77 +
78 +* **Required:** Cable ID, fiber ID, fiber geometry, fiber mode, fiber refraction index.
79 +* **Optional:** Fiber optical length, fiber start and end location, fiber one-way attenuation, fiber winding angle.
80 +
81 +==== **6. Channel Group** ====
82 +
83 +* **Required:** Interrogator ID, acquisition ID, channel group ID, cable ID, fiber ID, coordinate generation date.
84 +* **Optional:** Location method, coordinate reference frame, first/last usable channel ID, uncertainty of various coordinates (x, y, latitude, longitude, elevation, depth, strike, dip).
85 +
86 +==== **7. Channel** ====
87 +
88 +* **Required:** Channel group ID, channel ID, coordinates (x, y, latitude, longitude).
89 +* **Optional:** Elevation above sea level, depth below surface, distance along fiber, strike, dip.
90 +
91 +----
92 +
36 36  === ===
37 37  
38 38  = **Pre-processing Steps for DAS Data (2.5 months, 90 TB)** =
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247 -[[image:1706489800616-982.png]]
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251 -[[image:1706488566274-805.png]]
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