Correlation analysis recognition method of detection signal in closed spacing corrosion
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A technology of corrosion detection and correlation analysis, applied in the field of pattern recognition, multidisciplinary application of embedded systems, cathodic protection, buried pipeline cathodic protection, corrosion detection, to achieve the effect of solving synchronization problems
Inactive Publication Date: 2011-03-30
天津市嘉信技术工程有限责任公司
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[0011] The purpose of the present invention is to solve the problem of accurate synchronization of signals and clock drift between different detection equipment modules in the signal acquisition process of the pipeline detection system, and to provide a method for correlation analysis and identification of detection signals in densely spaced corrosion detection
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Embodiment 1
[0075] Example 1: CIPS-Logger, a densely spaced static data logger
[0076] The static data recorder is a special device used in closely spaced detection to record the change of cathodic protection current on the pipeline at a fixed position. The function of the instrument is to complete the collection of CIPS static detection data during the entire cathodic protection effect detection period under complex industrial and mining conditions, so as to realize the correction of earth current and stray current interference.
[0077] 1. Hardware implementation:
[0078] 80C52 single-chip microcomputer is used to form the system, and the main frequency is 12MHz;
[0079] External expansion of 32MB program / data memory;
[0082] 0.45 seconds ON, 0.8 seconds OFF; 1.65 seconds ON, 0.9 seconds OFF; 3 seconds ON, 2 seconds OFF;
[0083] 4 seconds ON, 1 second OFF.
[00...
Embodiment 2
[0111] Embodiment 2: Close interval data DSP recorder
[0112] The data DSP recorder is a special device used in closely spaced detection to record the change of the cathodic protection current on the pipeline along the pipeline route.
[0113] 1. Hardware implementation:
[0114] Adopt IT TMS320-2812DSP chip to form the system, the main frequency is 150MHz;
[0115] External expansion of 64MB program memory, 64MB data memory;
[0117] 16-bit A / D fast analog / digital conversion of cathodic protection potential;
[0118] 4 interrupt modes:
[0119] 0.45 seconds ON, 0.8 seconds OFF, 1.65 seconds ON, 0.9 seconds OFF, 3 seconds ON, 2 seconds OFF, 4 seconds ON, 1 second OFF.
[0120] The signal resolution of tube-ground potential is 1mV.
[0121] 2. Implementation of the method:
[0122] 1) The standard waveform library stores 32 waveforms with 16-bit precision, 8 waveforms for each interr...
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Abstract
The invention relates to the correlation analysis recognition method of detection signals in a close spacing corrosion examination. The invention applies the mathematical method of a correlation analysis to process and recognize the interrupt cycle of the cathodic protection signals of a close spacing examination device, and solves the problem of the synchronization of remote signals effectively.The method of the invention includes: the construction of a standard waveform signal database, the sampling and inputting of waveform signals which will be analyzed, the correlation analysis of the waveform signals, the recognition and the filter of the waveform signals, the correction of a clock drift, the setting of the parameter of the filter and the outputting of the waveform signals. The invention applies the correlation analysis method to recognize, which can guarantee the accuracy of the examination data effectively. The invention does not use the traditional GPS satellite synchronous mode, reduces the part of the close spacing examination device, reduces the construction cost of the system, simultaneously expands the application situation of the closes spacing examination system, for example examining nearby the big building, or using the interrupter in a cathodic protection station, and prevents the situation of that the examination is unable to implement while the quality ofthe GPS signals is weak from occurring.
Description
【Technical field】: [0001] The invention belongs to the technical field of cathodic protection for buried pipelines, and belongs to the technical field of multidisciplinary application of corrosion detection, cathodic protection, pattern recognition and embedded systems. 【Background technique】: [0002] Close Interval Potential Survey (CIPS) technology is one of the key technical methods for corrosion detection of buried steel pipelines today. The closely spaced corrosion detector measures the detailed relationship between the cathodic protection potential and the distance of the pipeline on the ground above the route of the buried steel pipeline, and completes the detection and evaluation of the effectiveness of the cathodic protection of the pipeline. [0003] The CIPS detector consists of a highly sensitive millivolt meter, cathodic protection current interrupter, CIPS static data recorder, Cu / CuSO 4 It is composed of equipment such as half-cell probe and tail wire wheel....
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