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Last modified by robert on 2024/05/17 16:52
From version 6.5
edited by Sima Mousavi
on 2024/01/29 14:36
Change comment: There is no comment for this version
To version 6.3
edited by Sima Mousavi
on 2024/01/29 13:13
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 -
14 14  = **DAS Data Collection System** =
15 15  
16 16  ==== **1. Interrogator Unit** ====
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42 42  * **Physical Location Determination:** The physical locations of these channels are ascertainable through methods like tap tests and GPS tracking.
43 43  * **Metadata for Channels:** Each channel or group of channels has its own metadata block, detailing specifics like location and properties.
44 44  
32 +=== ===
45 45  
46 -[[image:1706489800616-982.png]]
47 -
48 -
49 -
50 -[[image:1706488566274-805.png]]
51 -
52 52  ----
53 53  
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 -
93 93  === ===
94 94  
95 95  = **Pre-processing Steps for DAS Data (2.5 months, 90 TB)** =
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