Control method for acquiring dielectric constant of calibration material in real time

Abstract

The invention discloses a control method for acquiring a dielectric constant of a calibration material in real time, used for reflecting the real-time paving thickness and compaction degree of pitch;and determining a real-time reflection coefficient amplitude [Gamma]i of the calibration material and an air interface, and determining a relative dielectric constant [Xi][Gamma]i of the calibration material based on the real-time reflection coefficient amplitude [Gamma]i of the calibration material and an air interface; therefore, the lossless and nonstop real-time detection and calibration of the dielectric constant are achieved, and the defects and disadvantages that at present, vibration exists in the radar test and only initial dielectric constant is calibrated, and thus the material thickness, uniformity, compactness degree and damages cannot be truly reflected in real time are overcome, so as to further promote the commercial process of the ground penetrating radar. The control method provided by the invention is simple to use, convenient to operate, strong in function, strong in practicability, efficient and accurate, and has extremely high commercial value.

Description

technical field [0001] The invention belongs to the application field of ground penetrating radar, and in particular relates to a control method for real-time acquisition of the dielectric constant of calibration materials. Background technique [0002] GPR has the characteristics of wide detection range, high work efficiency and clear positioning, and is widely used in the fields of asphalt pavement thickness detection, compaction prediction and uniformity prediction, and pavement structural layer disease investigation. The ground penetrating radar excites electromagnetic waves to the measured object in a fixed way by the launching device, and obtains the required information through interlayer reflection. [0003] Different materials, different ratios and different compaction degrees will have differences in the electromagnetic wave propagation speed of pavement dielectric materials. The most critical step based on ground penetrating radar detection is to calibrate the die...

AI Technical Summary

Problems solved by technology

In the process of measuring the thickness of asphalt paving, although the non-stop calibration has been realized through algorithm design, in this process, it is still necessary to manually use a steel fork or a large screwdriver to randomly select measuring points according to needs, and insert them after the depth of the bottom surface of the asphalt layer. Read with a ruler, and then calibrate the ground penetrating radar, the calibration operation will artificially bring errors

Moreover, the asphalt mixture is not uniform. As the asphalt paving / compaction process advances, the dielectric constant of the asphalt mixture changes in real time within a certain range. If only the initial dielectric constant calibration of the GPR is performed, It cannot reflect the real-time paving thickness and compaction degree of asphalt in real time

[0005] To sum up, in the current existing technology, there is no technical solution that can solve the above technical problems, specifically, there is a lack of a control method for real-time acquisition of the dielectric constant of the calibration material

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