Distributed Acoustic Sensing Instrument (2 channels, 55 km) DAS-21-55KM
OVERVIEW
Overview
DAS-21-55KM is the two-channel workhorse: 55 km per channel with polarization plus frequency diversity reception, 3–26 m spatial resolution, 0.01 Hz–100 kHz bandwidth, 5.8 kg and 33–55 W. Two independent fibres are monitored simultaneously.
CORE STRENGTHS
Core strengths
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2 channels, 55 km
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Polarization + frequency diversity
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Two links in one unit
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Portable 5.8 kg
Key specifications
| Parameter | Value |
|---|---|
| Model | DAS-21-55KM |
| Channels | 2 channels |
| Maximum range | 55 km |
| Spatial resolution | 3–26 m |
| Frequency response | 0.01 Hz–100 kHz |
| Dimensions | 220 × 120 × 311 mm |
| Weight | 5.8 kg |
| Power consumption | 33–55 W |
| Fading suppression | Polarization and frequency diversity reception with coherent-fading suppression |
| Optical amplifier | EDFA peak power 0–200 mW (no Raman amplifier) |
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| Parameter | Value |
|---|---|
| AOM | 80 M / 200 M supported |
| Frequency sweep range | ±30 |
| Vibration dynamic range | ±500 rad |
| FPGA acquisition module | Xilinx Zynq7-100 (highest Zynq configuration) |
| On-board DDR | 4 GB |
| Narrow-linewidth laser | Linewidth 3–5 kHz; wavelength 1549.50–1550.50 nm; power 20 mW |
| Balanced detector | CMRR 30–45 dB; saturation 120 uW @1550 nm; NEP 8.5 pW/√Hz |
| Fibre interface | FC/APC |
| Operating temperature | -20 °C to 55 °C |
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