What data acquisition card is needed for distributed acoustic sensing?

Sampling Rate

According to the sampling theorem, a data acquisition card for distributed acoustic sensing requires a sampling rate of 250M if an 80M AOM is used. If a 200M AOM is chosen, then a data acquisition card with a 1G sampling rate is required.

Bits Of The Capture Card

Data acquisition cards need to be 14 bits and above, our 250M data acquisition cards are 14 bits and 1G data acquisition cards are 16 bits.

Physical Interface

The interface of the data acquisition card can choose PCIe or 10 Gigabit fiber optic interface. It is not recommended to use the USB interface, because our engineering practice, found that the USB data acquisition card stability is not high, resulting in a variety of abnormalities in the system.

Built-in Pulse

Distributed acoustic sensing applications require that pulses of light be fed into the fiber before acquisition begins. So for the simplicity of the system, usually we have built-in signal trigger output on the data acquisition card, which can trigger the data acquisition card out of the pulse signal to facilitate system integration. So a good data acquisition card for distributed acoustic sensing system should have a built-in pulse output function and be able to output TTL signals to the AOM driver.

IQ Algorithm Integration

Coherent distributed fiber optic sensing system demodulation of the first step is to carry out IQ demodulation, so the data acquisition card is best to be able to built-in IQ demodulation algorithm, which will reduce the system's demodulation operations combined with the complexity of the FPGA hardware to carry out the IQ demodulation, which will greatly accelerate the data processing speed.

Data Acquisition Card Products

Cost-Effective DAQ Boards For Distributed Acoustic Sensor DAS

[DAQ] 2024-02-16 04:27:39

Data Acquisition Card for Distributed Acoustic Fiber Sensing (DAS) with Pulse Output sends TTL pulses directly to the AOM driver, eliminating the need for an additional pulse generator and greatly reducing system complexity.

1GSps dual-channel high-speed data acquisition card

[DAQ] 2024-02-16 04:24:51

The DAQ board, which can be set up to 1G sample rate and has built-in trigger output and input interfaces, can be used for applications such as DAS distributed acoustic sensing system with 200M AOM acquisition or LIDAR.