Ground marking method for eliminating time drift of crystal oscillator
A technology of time drift and marking method, which is applied in seismology, geophysical measurement, electric/magnetic exploration, etc., and can solve problems that cannot meet the requirements of portability, low power consumption and low cost, accuracy of defect location, and difficulty of algorithms, etc. problem, to achieve the effect of eliminating crystal oscillator time drift, low power consumption and cost, and eliminating influence
Inactive Publication Date: 2012-01-11
TIANJIN UNIV
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This method must accurately measure the time when the inner detector passes through welding, and the subsequent processing needs to calculate linear calibration factors for multiple welds. The hardware is relatively complex and the algorithm is difficult, which cannot meet the requirements of portability, low power consumption and low cost. ; Due to the influence of the transmission delay and the structure of the internal detector itself, the time for the internal detector to pass through the same welding place measured by the ground marking system and the internal detector is different. This scheme calibrates the two times to be equal, thus introducing errors. Affects the accuracy of defect location
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[0032] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0033] In order to eliminate the influence of clock drift on the measurement results, improve the detection accuracy of ground markers, accurately locate the position of pipeline defects, and meet the requirements of portability, low power consumption and low cost, the embodiment of the present invention provides a method to eliminate crystal oscillator time Drift ground marking method, see figure 2 , image 3 , Figure 4 , Figure 5 and Figure 6 , see the description below:
[0034] The embodiment of the present invention is based on an existing ground marking system using a highly stable clock source synchronization method for time synchronization. The ground marking system includes two parts: a ground marker and a master clock...
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The invention discloses a ground marking method for eliminating time drift of a crystal oscillator and relates to the field of detection in pipelines. The method comprises the following steps of: coding ground markers before an internal detector is sent into a pipeline; performing time synchronization on the internal detector and the ground markers through a master clock; sending the internal detector into the pipeline for operation; placing the ground markers on ground marking piles; starting the ground markers to acquire data when the internal detector is close to the ground markers; recording the time when the internal detector passes through the ground markers; storing the recorded time when the internal detector passes through the ground markers into the ground markers; taking the internal detector out of the pipeline, and calibrating each ground marker for the second time; and transmitting the internal detector passing time recorded by the ground markers and data recorded by theinternal detector to a supervisory computer for processing so as to realize the positioning of pipeline defects. By the method, the influence of clock drift is effectively eliminated, the detection precision of the ground markers is improved, and the positions of the pipeline defects are accurately positioned.
Description
technical field [0001] The invention relates to the field of detecting ground markings in pipelines, in particular to a ground marking method for eliminating crystal oscillator time drift. Background technique [0002] With the rapid development of the pipeline transportation industry, the increase of pipelines, the increase of pipe age, the manufacturing defects, construction defects and corrosion of the pipeline itself, and man-made damage, etc., pipeline accidents occur frequently, seriously affecting the normal operation of the pipeline and the surrounding natural environment. , the safety and reliability of the pipeline has become increasingly prominent. The in-pipeline detection technology uses high-precision non-destructive detection equipment, advanced signal processing and digital storage systems to move forward under the impetus of oil and gas, complete the step-by-step scanning of the pipeline, and realize the precise positioning of pipeline defects such as pipeli...
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IPC IPC(8): G01B7/00G01V3/08G01V1/00F17D5/00
Inventor 李一博向红靳世久曾周末李健
Owner TIANJIN UNIV