Compact Distributed DAS All Demodulation Module with Integrated Acquisition Card
This module integrates all components of the DAS system, including the DAS optical path and data acquisition. Users only need to prepare a PC to obtain vibration data that has been demodulated by the FPGA on the acquisition card via the UDP protocol.
Huang
Email: Hqy@ybphotonics.com
Summarize
Coherent fading suppression DAS all-fiber demodulation module deeply integrates DAS optical acquisition front-end and DAS high-speed data processing back-end, and its length, width and size are only half A4 paper, providing a compact and convenient solution for distributed fiber acoustic wave measurement.
DAS optical acquisition front-end part, which integrates ultra-narrow linewidth light source, modulator, amplifier and coherent receiver module, realizes high signal-to-noise ratio coherent detection and ultra-long distance sensing, and ensures excellent performance of optical link.
Among them, DAS high-speed data processing back-end part adopts dual-channel 250MSps DAS high-speed acquisition card, supports Gigabit Ethernet communication (data transmission rate up to 1000Mb/s) or 10G optical port communication (data transmission rate up to 10Gb/s), and can collect more than 100km optical fiber data. Built-in phase demodulation algorithm, realize all-fiber demodulation and coherent fading suppression, can directly output amplitude and phase demodulation data, in which phase data can be directly used as vibration signal without secondary de-winding; can also output original sampling data for user-defined demodulation. This design reduces the dependence of the system on CPU computing power, simplifies the development process, and realizes "data reading is available, phase is vibration".
Product Features
- High-speed data acquisition and transmission
- Built-in all-fiber demodulation and coherent fading suppression algorithm
- Highly integrated compact design
Application
- Perimeter intrusion monitoring
- Oil and gas pipeline leakage warning
- Structural health monitoring of tunnels and slopes
- Submarine/Land Cable Condition Monitoring
- Urban Infrastructure Vibration Monitoring
Optical Path Structure
The internal optical path of this module is shown in the figure above. This module integrates the DAS optical path and the DAS acquisition card, and transmits signals to the host computer via an Ethernet port or optical port.
Product Performance Parameters
| performance parameter | least value | typical value | maximum | unit | remark |
|---|---|---|---|---|---|
| Measuring Distance | 40 | km | |||
| Pulse Width | 20 | 500 | ns | ||
| Impulse Frequency | 100 | 50000 | Hz | Depends on fiber length | |
| Response Frequency | 1 | 20000 | Hz | Depends on fiber length | |
| Intermediate Frequency | 80 | MHz | |||
| Spatial Resolution | 3 | m | |||
| Capture Card Resolution | 0.4m, 0.8m, 1.6m, 3.2m, 6.4m optional | m | |||
| Gauge Length | 2 | 32 | sampling site | ||
| Phase Noise Floor | <0.1rad@gauge =20m | distance dependent | |||
| Demodulation Algorithm | Coherent fading suppression all-fiber demodulation | ||||
| Data Transmission Interface | Gigabit Ethernet port/10 Gigabit optical port | ||||
| Data Transmission Rate | 1Gb/s(Gigabit Ethernet port)/10Gb/s(10Gb optical port) | ||||
| Data Transmission Type | Raw data, amplitude demodulated data, phase demodulated data | ||||
| Data Transmission Protocol | UPD | ||||
| Module Debugging Interface | Serial TTL | ||||
| Module Debugging Protocol | Modbus-RTU | ||||
| Working Voltage | 12 | V | |||
| Power | 37 | W | |||
| Preheating Time | 2 | Min | |||
| Operating Temperature | -20 | 60 | ℃ | ||
| Storage Temperature | -40 | 80 | ℃ | ||
Product Size Specification
[Figure 2] Product size description diagram
Description of Product Interface and Indicator Light
Table 1 Description of product interface
| interface type | silk-screen | explain |
|---|---|---|
| Green plug terminal | 5V | DC power supply +5V power supply |
| GND | DC power GND | |
| White plug terminal | COM | Serial port, TTL level, communication with host computer for adjusting parameters |
| Sensing fiber 1 | Sensor1 | Default FC/APC connector, single channel products use this interface |
| Sensing fiber 2 | Sensor2 | Default FC/APC connector |
| Gigabit Ethernet port | GbE | RJ45 connector, data transfer rate up to 1000Mb/s |
| 10G SFP+ optical port | 10G SFP+ | Data rates up to 10Gb/s via SFP+ optical module connection to external fiber |
Table 2 Description of product indicator light
| Type of indicator light | silk-screen | explain |
|---|---|---|
| Power indicator | P | Main power indicator lamp, always on means power on, off means power off |
| Raman 1 indicator | L1 | Raman amplifier 1 indicator light, always on or off |
| Raman 2 indicator | L2 | Raman amplifier 2 indicator light, always on or off |
Ordering Information
| Model | Type | Channels | Distance | Intermediate Frequency | Laser linewidth | Features |
|---|---|---|---|---|---|---|
| GY-DAS-CFS-40-250-1 | Fully Integrated Module | 1 | ≤40km | 80M | <3kHz | DAS optical path + acquisition card + compact size |
| GY-DAS-CFS-40-250-2 | Fully Integrated Module | 2 | ≤40km | 80M | <3kHz | DAS optical path + acquisition card + compact size |
| GY-DAS-CFS-60-250-1 | Fully Integrated Module | 1 | ≤60km | 80M | <3kHz | Add a Raman module for a longer detection range. |
| GY-DAS-CFS-60-250-2 | Fully Integrated Module | 2 | ≤60km | 80M | <3kHz | Add a Raman module for a longer detection range. |
FAQ
-
Q: What is the lead time for your fiber optic sensing related module products?
A: Basically, we have more than 90% of modules in stock, only a few models need 2 weeks lead time. -
Q: Do you support the sale of those countries, and is the shipping included?
A: Our service is available worldwide, regardless of country or region. Shipping is included. -
Q: Who are your typical customers?
A: More than 100 top universities and research institutes in China have chosen us and given us high evaluations, such as: Chinese Academy of Sciences, CEC, Tsinghua University, Peking University and other clients.
