Changes for page Integrated Distributed Acoustic Sensing (iDAS)

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1		-integrated Distributed Acoustic Sensing (iDAS)
	1	+Distributed Acoustic Sensing (DAS)

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1		-= **What is iDAS?** =
	1	+= **DAS Data Collection System** =
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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.
	3	+==== **1. Interrogator Unit** ====
4	4
5		-=== **Safety first!** ===
	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.
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7		-=== ===
	9	+==== **2. Surface Installation** ====
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10		-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.
11		-\\Cables and fibers may create tripping hazards. Ensure that the routing of cables is done in a way that minimizes the risk of accidents.
12		-
13		-----
14		-
15		-=== **System Components** ===
16		-
17		-
18		-The iDAS system consists of the following components:
19		-
20		-1. **Interrogator unit:** This unit houses the laser, detector, and electronics for processing the backscattered light signal. It records various settings such as the optical system configurations, spatial sampling rates, and the duration of data acquisition. 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.
21		-1. **Optical fiber:** The optical fiber is the sensor that is used to measure strain rate.
22		-1. **Data acquisition software**: This software is used to control the interrogator unit and to acquire and process the data. It records various settings such as the optical system configurations, spatial sampling rates, and the duration of data acquisition.
23		-
24		-----
25		-
26		-= **DAS Data Collection System** =
27		-
28		-==== **1. Surface Installation** ====
29		-
30	30	* **Cable Arrangement:** The optical fiber cable can be a single long continuous cable or multiple cables with connectors, used across different installation environments.
31	31	* **Cable Types:** Cables may vary in construction types based on the installation environment.
32	32	* **Geographical Metadata:** Parameters related to geographical location are specified for easy searchability in databases.
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34		-==== **2. Installation Environments** ====
	15	+==== **3. Fiber Optic Cable** ====
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	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	+
36	36	* **Shallow Burial:** The cable can be shallowly buried.
37	37	* **In-Conduit Installation:** The cable can also be installed within a conduit.
38	38	* **Water Installation:** Suitable for underwater environments.
39	39
40		-==== **3. Channels** ====
	26	+==== **5. Channels** ====
41	41
42	42	* **Sensor Distribution:** Channels represent sensors distributed along the fiber array at fixed intervals.
43	43	* **Physical Location Determination:** The physical locations of these channels are ascertainable through methods like tap tests and GPS tracking.
44	44	* **Metadata for Channels:** Each channel or group of channels has its own metadata block, detailing specifics like location and properties.
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46		-[[image:1706489800616-982.png]]
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50		-[[image:1706488566274-805.png]]
51		-
52	52	----
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54	54	= **DAS Metadata Schema** =
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309	309	[[Caption>>image:1706488806394-168.png]]
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