Distributed DAS All Demodulation Module
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
Product Info
Introduction
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.
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".
Character
- 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
II. 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 ℃
III. Product Size Specification
[Figure 2] Product size description diagram
IV. 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
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.
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".
Character
- 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
II. 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 | ℃ | ||
III. Product Size Specification
[Figure 2] Product size description diagram
IV. 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 |
Product Related Videos
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.
DAS Hardware All-in-One Comparison
| Product Type | Universal DAS hardware all-in-one | Enhanced DAS hardware all-in-one | High-performance DAS hardware all-in-one |
|---|---|---|---|
| Image |  |  |  |
| modulation scheme | single-pulse modulation | single-pulse modulation | sweep modulation |
| demodulation | Digital IQ demodulation, fpga+upper computer software demodulation | Digital IQ demodulation, fpga+upper computer software demodulation | Chirp demodulation |
| Inhibition of Coherent Decay | implemented | implemented | implemented |
| Full-area phase demodulation | implemented | implemented | implemented |
| spatial resolution | 6-10 meters | 3-10 meters | 2meters |
| signal-to-noise ratio： | general | general | high |
| sensitivity： | general | general | high |
| Market Prevalence： | More (basically this program) | Less | Less（Only 2-3 in China） |
| Acquisition Signal： | IF signal | IF signal | IF signal (complete signal acquisition) |
| Acquisition Channel： | dual channel | dual channel | single channel |
| Demodulation flexibility： | High (flexibility to modify different algorithms) | High (flexibility to modify different algorithms) | High (flexibility to modify different algorithms) |
| Detection distance： | 30km/50km | 30km/50km | 20km/40km |
| detection frequency： | 50kHz@1km | 50kHz@1km | 50kHz@1km |
| response band： | 0.02Hz-20kHz(Distance Related) | 0.02Hz-20kHz(Distance Related) | 1Hz-20kHz(Distance Related) |
| Fiber Type： | Single mode G652/G652D | Single mode G652/G652D | Single mode G652/G652D |
| optical connector： | FC/APC | FC/APC | FC/APC |
| communication interface： | PCIE/Ethernet | PCIE/Ethernet | PCIE/Ethernet |
| dimension： | 482*390*133mm | 482*500*178mm | 482*500*178mm |
| electricity supply： | AC220V | AC220V | AC220V |
| power wastage： | 220W | 480W | 480W |
