CN214173390U

CN214173390U - Optical fiber sensing high-speed data acquisition system

Info

Publication number: CN214173390U
Application number: CN202120372800.1U
Authority: CN
Inventors: 沈涛
Original assignee: Harbin Duanjin Photoelectric Technology Co ltd
Current assignee: Harbin Duanjin Photoelectric Technology Co ltd
Priority date: 2021-02-17
Filing date: 2021-02-17
Publication date: 2021-09-10
Anticipated expiration: 2031-02-17

Abstract

The utility model provides a high-speed data acquisition system of optical fiber sensing, including broadband light source, optical fiber isolator, coupler, optical fiber sensing unit, photoelectric detector and signal acquisition processing module, wherein contain wave filter, signal amplifier, high-speed AD converting circuit, FPGA module, SDRAM memory, power module, DSP treater, SFP module, transmission optic fibre and PC terminal in the signal acquisition processing module. The utility model relates to an improve the collection inefficiency that current traditional optical fiber sensing data acquisition system exists, the energy consumption is high and transmission rate is not enough scheduling problem. The utility model discloses can be applied to high-speed data acquisition and analysis processes in the optical fiber sensing field.

Description

Optical fiber sensing high-speed data acquisition system

Technical Field

The utility model belongs to the technical field of data acquisition, concretely relates to high-speed data acquisition system of optical fiber sensing.

Background

The data acquisition technology plays a vital role in industrial intellectualization, mainly researches acquisition, processing and display of external physical signals, and brings convenience for people to know external environment. Developed countries such as europe and the united states have been widely used in the fields of industrial control, remote sensing, radar monitoring, etc., as early as the end of the 20 th century. The key to data acquisition is the sensing element, and there are only two indicators to assess its performance: firstly, the precision of collection and secondly the speed of collection. The accuracy mainly depends on the conversion accuracy of the analog-to-digital converter ADC, and the acquisition and processing speed mainly depends on the Digital Signal Processor (DSP) and the field-programmable gate array (FPGA). For a sensing element, a traditional electrical sensor is easily interfered by the outside, so that accurate measurement is difficult to be carried out in severe environments such as high temperature, high voltage, strong electromagnetic interference and the like. Therefore, the optical fiber sensing technology has unprecedented development and application with its advantages of being unique.

With the continuous development of the optical fiber sensing technology, the optical fiber sensing device has the excellent performances of small volume, high sensitivity, electromagnetic interference resistance and the like, so that the optical fiber sensing technology and the high-speed data acquisition system are combined to have wider development prospect and research significance in the aspect of environment detection.

Disclosure of Invention

The utility model aims at solving the problems of low acquisition efficiency, high energy consumption, insufficient transmission rate and the like of the existing traditional optical fiber sensing data acquisition system, and providing an optical fiber sensing high-speed data acquisition system.

Therefore, the utility model adopts the following technical scheme:

the utility model provides a high-speed data acquisition system of fiber sensing which characterized in that: an optical fiber sensing high-speed data acquisition system is characterized in that: including broadband light source (1), optical fiber isolator (2), coupler (3), optical fiber sensing unit (4), photoelectric detector (5) and signal acquisition processing module (6), broadband light source (1) connects the input of optical fiber isolator (2), the input of coupler (3) links to each other with the output of optical fiber isolator (2) and the input of photoelectric detector (5) respectively, the input of optical fiber sensing unit (4) is connected to the output of coupler (3) simultaneously, the input of signal acquisition processing module (6) is connected to the output of photoelectric detector (5), wherein:

the signal acquisition and processing module (6) comprises a filter (6-1), a signal amplifier (6-2), a high-speed A/D conversion circuit (6-3), an FPGA module (6-4), an SDRAM memory (6-5), a power module (6-6), a DSP processor (6-7), an SFP module (6-8), a transmission optical fiber (6-9) and a PC terminal (6-10).

The broadband light source (1) is a strong-stability laser light source, the output light power is-3 dB, and the frequency bandwidth is 60 nm.

The optical fiber isolator (2) has the function of enabling light emitted by the light source to pass in a single direction, and reverse transmission is avoided so as to ensure the stability of an optical path system.

The coupler (3) is an optical fiber coupler, and receives and transmits the optical signal reflected by the optical fiber sensing unit (4) to the photoelectric detector (5).

The photoelectric detector (5) converts the received optical signals into electric signals and transmits the electric signals to the signal acquisition and processing module (6).

The signal acquisition processing module (6) filters, amplifies and acquires and processes the received electric signals at a high speed, and finally converts the processed data into optical signals and transmits the optical signals to the PC terminal (6-10) through optical fibers.

The high-speed A/D conversion circuit (6-3) adopts an AD9226 chip, the sampling frequency is set to be 60Hz, and the sampling rate reaches 5.78 Gb/s.

The SFP modules (6-8) realize the conversion from electrical signals to optical signals so as to achieve the purpose of transmitting data by optical fibers.

The utility model provides a high-speed data acquisition system of optical fiber sensing, this system have improved the collection inefficiency that current traditional optical fiber sensing data acquisition system exists, the energy consumption is high and transmission rate is not enough scheduling problem.

Generally, the utility model relates to a high-speed data acquisition system of optical fiber sensing mainly has following beneficial effect:

the utility model adopts the high-speed A/D conversion circuit, which effectively improves the precision and speed of collection when the optical fiber sensing is applied;

the utility model combines the FPGA module and the DSP processor, and adds the SDRAM memory additionally, thus not only increasing the processing capacity and the processing speed, but also improving the data storage capacity;

the utility model discloses a SFP module carries out ultimate optical fiber transmission, converts the signal of telecommunication into optical signal transmission to PC terminal, the effectual transmission rate and anti-electromagnetic interference ability that have improved.

In a word, the optical fiber sensing is combined with a high-speed data acquisition system, so that the accuracy, the acquisition rate and the anti-interference capability of measuring the environmental physical quantity are improved, and the manufacturing cost is reasonably saved.

Drawings

Fig. 1 is an overall structure diagram of an optical fiber sensing high-speed data acquisition system according to the present invention;

fig. 2 is a partially detailed view of the signal acquisition processing module.

Detailed Description

The following description will further describe the embodiments of the present invention with reference to the drawings.

Fig. 1 is a high-speed data acquisition system using optical fiber sensing according to this embodiment, which includes a broadband light source (1), an optical fiber isolator (2), a coupler (3), an optical fiber sensing unit (4), a photodetector (5), and a signal acquisition and processing module (6), where the broadband light source (1) is connected to an input end of the optical fiber isolator (2), an input end of the coupler (3) is respectively connected to an output end of the optical fiber isolator (2) and an input end of the photodetector (5), an output end of the coupler (3) is connected to an input end of the optical fiber sensing unit (4), and an output end of the photodetector (5) is connected to an input end of the signal acquisition and processing module (6);

referring to fig. 2, the signal acquisition processing module (6) comprises a filter (6-1), a signal amplifier (6-2), a high-speed a/D conversion circuit (6-3), an FPGA module (6-4), an SDRAM memory (6-5), a power module (6-6), a DSP processor (6-7), an SFP module (6-8), a transmission fiber (6-9) and a PC terminal (6-10).

The optical fiber isolator (2) has the function of enabling light emitted by the light source to pass through in a single direction, and reverse transmission is avoided so as to ensure the stability of an optical path system.

The signal acquisition processing module (6) filters, amplifies and acquires and processes the received electric signals at a high speed, and finally converts the processed data into optical signals and transmits the optical signals to the PC terminal (6-10) through an optical fiber.

The working principle is as follows: the broadband light source sends out light pulses, the light pulses pass through the optical fiber isolator and are transmitted to the optical fiber sensing unit through the coupler, the optical fiber sensing unit is arranged in a tested environment, when the environment changes, the optical fiber sensing unit senses the light pulses and transmits reflected light signals with environment information to the optical fiber coupler, the optical fiber coupler distributes the reflected light signals to the photoelectric detector, and the reflected light signals are converted into electric signals after being received and transmitted to the signal acquisition and processing module. And finally, filtering and amplifying the received electric signals, performing high-speed A/D conversion, transmitting the electric signals to an FPGA module for real-time storage, performing data transmission butt joint with a DSP processor, converting the data processed by the DSP processor into optical signals through an SFP module, and transmitting the optical signals to a PC terminal for analysis at a high speed through an optical fiber.

Claims

1. An optical fiber sensing high-speed data acquisition system is characterized in that: including broadband light source (1), optical fiber isolator (2), coupler (3), optical fiber sensing unit (4), photoelectric detector (5) and signal acquisition processing module (6), broadband light source (1) connects the input of optical fiber isolator (2), the input of coupler (3) links to each other with the output of optical fiber isolator (2) and the input of photoelectric detector (5) respectively, the input of optical fiber sensing unit (4) is connected to the output of coupler (3) simultaneously, the input of signal acquisition processing module (6) is connected to the output of photoelectric detector (5), wherein:

2. The optical fiber sensing high-speed data acquisition system according to claim 1, characterized in that: the broadband light source (1) is a strong-stability laser light source, the output light power is-3 dB, and the frequency bandwidth is 60 nm.

3. The optical fiber sensing high-speed data acquisition system according to claim 1, characterized in that: the optical fiber isolator (2) has the function of enabling light emitted by the light source to pass in a single direction, and reverse transmission is avoided so as to ensure the stability of an optical path system.

4. The optical fiber sensing high-speed data acquisition system according to claim 1, characterized in that: the coupler (3) is an optical fiber coupler, and receives and transmits the optical signal reflected by the optical fiber sensing unit (4) to the photoelectric detector (5).

5. The optical fiber sensing high-speed data acquisition system according to claim 1, characterized in that: the photoelectric detector (5) converts the received optical signals into electric signals and transmits the electric signals to the signal acquisition and processing module (6).

6. The optical fiber sensing high-speed data acquisition system according to claim 1, characterized in that: the signal acquisition processing module (6) filters, amplifies and acquires and processes the received electric signals at a high speed, and finally converts the processed data into optical signals and transmits the optical signals to the PC terminal (6-10) through optical fibers.

7. The optical fiber sensing high-speed data acquisition system according to claim 1, characterized in that: the high-speed A/D conversion circuit (6-3) adopts an AD9226 chip, the sampling frequency is set to be 60Hz, and the sampling rate reaches 5.78 Gb/s.

8. The optical fiber sensing high-speed data acquisition system according to claim 1, characterized in that: the SFP modules (6-8) realize the conversion from electrical signals to optical signals so as to achieve the purpose of transmitting data by optical fibers.