Multi-channel data acquisition device for submarine pipeline magnetic flux leakage internal detector

An internal detector and data acquisition technology, applied in the direction of material magnetic variables, etc., can solve the problems of incompetence for multi-channel high-frequency switching data acquisition tasks, cumbersome installation, poor scalability, etc., to reduce development cycle and technical risks, improve Stability and reliability, the effect of improving the overall performance index

CN102495132AActive Publication Date: 2012-06-13NORTHEASTERN UNIV
7 Cites 30 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-06-13

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a multi-channel data acquisition device for a submarine pipeline magnetic flux leakage internal detector. The multi-channel data acquisition device comprises a hall sensor, a multi-path switch, an instrument amplifier, an analog-to-digital (AD) conversion module, a field programmable gate array (FPGA), a digital signal processor (DSP) and a secure digital memory (SD) card, wherein the multi-path switch has a two-stage series structure; the multi-channel data acquisition device is provided with heat insulation cotton so as to adapt to a specific high-temperature and high-corrosion environment of a submarine pipeline; the hall sensor converts the magnetic induction density into voltage; the voltage is switched by the multi-path switch, so that a signal is transmitted to the instrument amplifier; the instrument amplifier amplifies a weak signal; the AD conversion module sets sampling for eight times through software, performs analog-to-digital conversion, and transmits a digital value to the FPGA after the conversion; and the DSP receives FPGA cached data, digitally filters and compresses the cached data, and finally stores the data into the SD card. Due to a dual central processing unit (CPU) structure consisting of the FPGA and the DSP, a large amount of data can be stored and processed; the device has the characteristics of high speed, multiple channels, high resolution and the like; furthermore, pipeline transportation safety is guaranteed; and early maintenance is facilitated.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of industrial automation control, and in particular relates to a multi-channel data acquisition device for a magnetic flux leakage internal detector of a submarine pipeline. Background technique

[0002] Pipeline non-destructive testing technology is a technology used to detect safety hazards such as corrosion, wear, and cracks in long-distance oil and gas pipelines in the petroleum industry. The detection of the pipeline mainly includes the internal detection and external detection of the pipeline.

[0003] At present, the external inspection of the pipeline can prompt when the pipeline has leaked, but this is an after-event treatment, which can only reduce the loss, and cannot completely eliminate the loss. However, the internal inspection of pipelines can identify potential pipeline defects, and can distinguish the size and type of defects for early maintenance, so that they can be found and repaired bef...

Examples

Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] The multi-channel data acquisition device used for the magnetic flux leakage internal detector of the submarine pipeline of the present invention comprises a Hall sensor, a multi-way switch, an instrument amplifier, an AD conversion module, FPGA, DSP and an SD card, and the structural block diagram is as follows figure 1 shown;

[0034] In this embodiment, the Hall sensor uses Honeywell SS495A linear Hall integrated circuit, which includes an amplifier circuit and an output compensation circuit, powered by a single power supply of 5V, and the input magnetic induction range is -670-670 Gauss.

[0035] DSP chooses TMS320VC5509, which can realize HPI parallel port communication with FPGA and transfer data with SD card. Calculated according to the running speed of the internal detector, sampling frequency, number of channels, AD resolution and detection time, the t...