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Sima Mousavi 6.5 1 = **What is iDAS?** =
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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.
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Sima Mousavi 8.1 5 === **Safety first!** ===
Sima Mousavi 6.5 6
Sima Mousavi 8.1 7 === ===
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Sima Mousavi 6.5 9 (% class="box warningmessage" %)
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.
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13 ----
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Sima Mousavi 7.1 15 === **System Components** ===
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Sima Mousavi 8.2 18 The iDAS system consists of the following components:
Sima Mousavi 7.1 19
Sima Mousavi 8.2 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.
Sima Mousavi 7.1 23
Sima Mousavi 8.2 24 ----
Sima Mousavi 7.1 25
Sima Mousavi 6.3 26 = **DAS Data Collection System** =
Sima Mousavi 5.1 27
Sima Mousavi 8.2 28 ==== **1. Surface Installation** ====
Sima Mousavi 6.3 29
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 * **Cable Types:** Cables may vary in construction types based on the installation environment.
32 * **Geographical Metadata:** Parameters related to geographical location are specified for easy searchability in databases.
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Sima Mousavi 8.2 34 ==== **2. Installation Environments** ====
Sima Mousavi 6.3 35
36 * **Shallow Burial:** The cable can be shallowly buried.
37 * **In-Conduit Installation:** The cable can also be installed within a conduit.
38 * **Water Installation:** Suitable for underwater environments.
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Sima Mousavi 8.2 40 ==== **3. Channels** ====
Sima Mousavi 6.3 41
42 * **Sensor Distribution:** Channels represent sensors distributed along the fiber array at fixed intervals.
43 * **Physical Location Determination:** The physical locations of these channels are ascertainable through methods like tap tests and GPS tracking.
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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Sima Mousavi 6.5 46 [[image:1706489800616-982.png]]
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Sima Mousavi 8.1 50 [[image:1706488566274-805.png]]
Sima Mousavi 6.5 51
Sima Mousavi 6.4 52 ----
Sima Mousavi 6.3 53
Sima Mousavi 6.4 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.
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Sima Mousavi 5.1 91 ----
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Sima Mousavi 6.3 93 === ===
Sima Mousavi 5.1 94
Sima Mousavi 6.3 95 = **Pre-processing Steps for DAS Data (2.5 months, 90 TB)** =
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97 1. (((
98 **Create a Deployment Log**
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100 * Document key details like photonics settings, duration of data collection, instances of hard disk failure, power outages, etc.
101 )))
102 1. (((
103 **Generate Geographic Coordinates**
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105 * Assign latitude and longitude coordinates to each DAS channel for spatial referencing.
106 )))
107 1. (((
108 **Data Conversion**
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110 * Convert the raw DAS time series data from counts to strain rate, which is more meaningful for seismic analysis.
111 )))
112 1. (((
113 **Data Decimation**
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115 * 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.
116 )))
117 1. (((
118 **Extract Specific Time Series**
119
120 * Isolate time series data of special interest, such as those related to earthquake events, for detailed analysis.
121 )))
122 1. (((
123 **Data Hosting**
124
125 * Store the processed data on Research School of Earth Sciences (RSES) clusters and the National Computational Infrastructure (NCI) for accessibility and further analysis.
126 )))
127 1. (((
128 **Extract Data and Instrument Response from Seismic Nodes**
129
130 * Retrieve both the raw data and the corresponding instrument response characteristics for accurate interpretation of the seismic signals.
131 )))
132 1. (((
133 **Long-term Archiving and Data Sharing**
134
135 * 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.
136 )))
137 1. (((
138 **Data Access and Record Keeping**
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140 * 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.
141 )))
142
143 === ===
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Sima Mousavi 9.15 145 ----
Sima Mousavi 6.3 146
Sima Mousavi 9.16 147 == **iDAS Software Overview** ==
Sima Mousavi 9.11 148
Sima Mousavi 10.3 149 ==== **Operating System Compatibility:** ====
Sima Mousavi 9.15 150
151 * (((
152 The iDAS system software is designed to run on the Windows operating system, with the current version compatible with Windows 7.
153 )))
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Sima Mousavi 10.3 155 ==== **Accessing the System:** ====
Sima Mousavi 9.11 156
Sima Mousavi 10.3 157 * (((
158 **User Login:** The system is set up to log in automatically as "User", without requiring any credentials.
159 )))
Sima Mousavi 9.11 160 * **Software Shortcut:** A shortcut to access the iDAS software is conveniently placed on the desktop for easy access.
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Sima Mousavi 10.3 162 ==== **Data Acquisition Controls** ====
Sima Mousavi 6.3 163
Sima Mousavi 9.16 164 * (((
165 **Start / Stop:** Easily control the start and stop of data acquisition using the current settings.
166 )))
Sima Mousavi 9.15 167 * **Calibrate Reference:** Recalibrate reference levels as needed.
168 * **Exit:** Safely exit the iDAS software.
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Sima Mousavi 10.3 170 ==== **Configuration iDAS Setup Wizard:** ====
Sima Mousavi 9.15 171
Sima Mousavi 10.3 172 (% class="wikigeneratedid" %)
173 Provides a guided, step-by-step process for setting up the iDAS system.
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175 * (((
176 **iDAS Configuration:** Access the iDAS configuration window for advanced settings.
177 )))
Sima Mousavi 9.15 178 * **Trigger Mode:** Opens the trigger configuration window for specific acquisition needs.
179
Sima Mousavi 10.3 180 ==== **Operating Modes ** ====
Sima Mousavi 9.15 181
Sima Mousavi 10.3 182 * (((
183 **Available Modes:** Acoustic, Waterfall, Stacking, Security, and OTDR.
184 )))
Sima Mousavi 9.15 185 * **Functionality:** Each mode presents the acoustic data from iDAS in unique formats.
186 * **Detailed Information:** See pages 19-23 of the Standard iDAS manual for comprehensive details on each mode.
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Sima Mousavi 12.2 188
189
190 === **Application Type Options** ===
191
192 1. **Diagnostic Setup Only:**
193 1*. Retrieves current settings for a basic diagnostic overview.
194 1. **Seismic Application:**
195 1*. Sets Data Output Frequency to 1000 Hz.
196 1*. Adjusts Data Output Spatial Resolution to 2 meters.
197 1. **Flow Monitoring:**
198 1*. Changes Data Output Frequency to 10,000 Hz.
199 1*. Sets Data Output Spatial Resolution to 0.25 meters.
200 1. **Security Monitoring:**
201 1*. Configures Data Output Frequency to 1000 Hz.
202 1*. Sets Data Output Spatial Resolution to 2 meters.
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205 [[image:1706508500303-165.png]]
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Sima Mousavi 12.6 208 === **Detailed Parameter Information** ===
Sima Mousavi 12.2 209
Sima Mousavi 12.6 210 1. **Time Decimation and Output Decimation:**
211 1*. These values are calculated based on the physical fiber length.
212 1. **Measure Length (m):**
213 1*. Generated value: 10176 meters.
214 1*. Note: 'Measure Length' includes the reference fiber inside the iDAS unit, differentiating it from 'Physical Fibre Length'.
215 1. **Pulse Width (ns):**
216 1*. Generated value: 50 nanoseconds.
217 1*. Spatial Extent: A 50ns pulse corresponds to a 10m spatial extent.
Sima Mousavi 12.2 218
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Sima Mousavi 12.7 220 [[image:1706508761205-307.png]]
Sima Mousavi 12.2 221
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Sima Mousavi 12.13 225
226 === **Optimal Light Management** ===
227
228 * **Objective:** Achieve balanced light distribution across the region of interest in the iDAS system.
229
230 === **Adjustment Guidelines** ===
231
232 1. **Setting Optical Power:**
233 1*. Aim to have the start of the region of interest around or below +4000 units.
234 1*. Ensure the far end of the region of interest does not enter a non-linear response scheme.
235 1. **Consideration for Short Fibers:**
236 1*. In cases where the fiber length is short and non-linear effects are not observed, set the Optical Power to its maximum.
237 1*. **Power Scale:** The adjustment slider ranges from 0-100, representing the percentage of maximum power available.
238
239 === **Note on Optical Power Control** ===
240
241 * **Control Mechanism:** The slider provides a precise control mechanism to manage the intensity of light sent through the fiber.
242 * **Monitoring and Adjustment:** Continuously monitor and adjust as necessary to ensure optimal performance.
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Sima Mousavi 12.14 245 [[image:1706509177362-144.png]]
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Sima Mousavi 12.14 251 XXXXXXXXXXX
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Sima Mousavi 12.14 253 [[image:1706509232964-660.png]]
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Sima Mousavi 12.17 257 == **Integrating GPS Antenna for Accurate Timing** ==
Sima Mousavi 12.13 258
Sima Mousavi 12.17 259 === **Installation and Connection Process** ===
Sima Mousavi 12.13 260
Sima Mousavi 12.17 261 **Connecting the GPS Antenna:**
Sima Mousavi 12.13 262
Sima Mousavi 12.17 263 * Connect one end of a coaxial cable with SMB female connectors to the GPS antenna.
264 * If you plan to mount the antenna, do so before connecting the cable.
265 * Connect the other end of the cable to the 'GPS Ant.' port located on the output panel at the front of the iDAS unit.
Sima Mousavi 12.13 266
Sima Mousavi 12.17 267 === **Monitoring GPS Status and Time** ===
Sima Mousavi 12.13 268
Sima Mousavi 12.17 269 * **GPS Information Display:** The GPS status and time are displayed on the Tool Bar of the iDAS software.
270 * **Status Indicators:**
271 ** **Red:** Antenna is not connected.
272 ** **Amber:** Antenna connected, but self-survey not completed.
273 ** **Green:** Antenna connected, self-survey completed, and timing is accurate.
Sima Mousavi 12.13 274
Sima Mousavi 12.18 275 [[image:1706509432197-316.png]]
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Sima Mousavi 10.1 289 === [[image:1706506304897-924.png]] ===
Sima Mousavi 6.3 290
Sima Mousavi 11.3 291 [[image:1706506500585-231.png]]
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Sima Mousavi 6.3 293 ----
294
295 = **Silixa iDAS Setup Manual for Reoccupying/Duplicating Experiment** =
296
297 = **General Information** =
298
Sima Mousavi 5.1 299 * **Experiment Name:** ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~__
300 * **Local Date:** ~_~_~_~_/~_~__**/202**
301 * **Local Time:** ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~__
302 * **Personnel:** ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_
303 * **Site Condition Notes:**
304 ** [Space for detailed notes about the site condition, any upkeep performed, and changes made since the last visit.]
305
306 ----
307
308 ==== **Setup Procedure** ====
309
310 1. (((
311 **Open iDAS Box**
312
313 * Serial Number: ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~__
314 * IP Address: ~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_~_
315 )))
316 1. (((
317 **Check Laser Lock**
318
319 * Ensure the lever on the LASER/RIGHT side of the iDAS is in the locked position (LEVER UP).
320 )))
321 1. (((
322 **Placement of iDAS**
323
324 * Position the iDAS on a stable surface.
325 * Ensure clear air flow around the fan vents.
326 )))
327 1. (((
328 **UPS Setup** (If applicable)
329
330 * Connect the UPS to a power source.
331 * Plug the NAS into the UPS using the special cable with a rectangular connector.
332 * Connect the monitor to the UPS.
333 )))
334 1. (((
335 **Peripheral Connections**
336
337 * Connect a computer monitor, mouse, and keyboard to the iDAS.
338 )))
339 1. (((
340 **GPS Antenna Connection**
341
342 * Connect the GPS antenna to the left-side socket on the front of the iDAS using a special adapter.
343 )))
344 1. (((
345 **Fibre Optic Connection**
346
347 * Clean both the fibre optic cable and the socket with a 1-click cleaner before connection.
348 * Use the guide/tip for cleaning the fibre and clean the socket without it.
349 )))
350 1. (((
351 **Powering the iDAS**
352
353 * Connect the iDAS to a power socket or UPS.
354 * Note: The iDAS turns on automatically when connected to power. Use the power button at the bottom left if it does not.
355 )))
356 1. (((
357 **Network Drive Mapping**
358
359 * Open File Explorer and select 'This PC' from the left pane.
360 * On the File Explorer ribbon, select 'More' > 'Map network drive'.
361 * Choose a drive letter from the 'Drive' list.
362 )))
363 1. (((
364 **Open iDAS Software**
365
366 * Use the link/shortcut on the Desktop.
367 )))
368 1. (((
369 **GPS Satellite Confirmation**
370
371 * Check for a green light in the top row of the software interface indicating GPS satellite detection.
372 )))
373 1. (((
374 **Lever/Interlock Adjustment**
375
376 * Lower the lever/interlock (as mentioned in step 2) before starting data acquisition.
377 )))
378 1. (((
379 **Configuration File Duplication**
380
381 * Use 'current.cfg' for duplicating previous setup.
382 * The file is located at C:/Silixa/Data/current.cfg.
383 * Copy this file to the desktop and save it with a new filename.
384 )))
385 1. (((
386 **iDAS Configuration Settings**
387
388 * Navigate to the 'Configuration' tab and click 'iDAS configuration'.
389 * Check all values under 'system'.
390 * Under 'application', enable error messages.
391 * In 'saving', select 'acoustic saving', choose 'tdms', and set the file save location and identifier.
392 * Leave default parameters in 'measure'.
393 )))
394 1. (((
395 **Mode Selection**
396
397 * Toggle between Acoustic mode, Waterfall mode, and OTDR mode to check data recording.
398 )))
399 1. (((
400 **Photograph OTDR Mode**
401
402 * Document the OTDR mode settings with a photograph.
403 )))
404 1. (((
405 **Photograph Waterfall Mode**
406
407 * Similarly, take a picture of the Waterfall mode settings.
408 )))
409 1. (((
410 **Configuration File Saving**
411
412 * Save the configuration file in .cfg format in a separate location without overwriting the existing one.
413 )))
414 1. (((
415 **Software Check**
416
417 * Ensure QFinder, Teamviewer, and Microsoft Remote Desktop are installed.
418 )))
419 1. (((
420 **Remote Access Setup**
421
422 * Open Teamviewer or Microsoft Remote Desktop.
423 * For Teamviewer, photograph the ID and password and ensure it remains open.
424 * For Microsoft Remote Desktop, record the IP address and test remote access with a separate laptop.
425 )))
426 1. (((
427 **Final Mode Setting**
428
429 * Switch to OTDR mode for ongoing operation (avoids excessive memory usage of Waterfall mode).
430 )))
431
432 ----
433
434 ==== **Important Reminders** ====
435
436 * Always ensure that the iDAS is connected to a suitably earthed power socket or UPS for safety.
437 * Regularly check the condition of all cables and connectors.
438 * Before leaving the setup, confirm that data saving is active if required.
439 * Keep a log of all actions taken during the setup for future reference and troubleshooting.
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Sima Mousavi 6.2 445 [[Caption>>image:1706488806394-168.png]]
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Sima Mousavi 6.2 452 [[How to clean the optical connector>>image:1706488909085-143.png||alt="How to clean the optical connector"]]
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