3.3 Ultrasonic testing technology
Ultrasonic waves are high-frequency sound waves that are invisible to the human ear and satisfy the wave transmission law during the frequency transmission process. Ultrasonic detection technology firstly transmits ultrasonic waves at the experimental detection position, and then receives ultrasonic-related parameters through the ultrasonic receiver to judge the internal defects of the structure. Sensors are set at different positions in the medium to measure the time when the ultrasonic wave propagates within a certain distance. The relationship between velocity, time and displacement is used to calculate the wave velocity. The relationship between the velocity and the medium-related parameters can be used to determine the relevant parameters of the material such as elastic modulus and compression resistance. Strength, flexural strength, etc., can also be used to detect defects inside materials or structures.
3.4 Application of laser technology in road bridges
Laser technology is mainly used to monitor road and bridge pavement. The specific application principles include optical time difference, photoelectric reflection, and diffraction. The principle of diffraction mainly uses the laser to summarize the diffraction process. If the slit is encountered, the diffraction will occur. By adjusting the width of the slit, different images of light and dark can be obtained, thereby establishing the correlation and changing the slit width in the structure. Analyze. The principle of photoelectric reflection is mainly that the laser intensity has a direct relationship with the intensity of the photocurrent. Under the action of the photoelectric converter, the light energy can be converted into electric energy. The change of the intensity of the laser, the signal of photoelectric conversion into electric energy will also change, according to The deflection of the deflection is calculated in advance by the calibration of the relationship between the photocurrent and the displacement. The principle of optical time difference is mainly to record the time difference of laser transmission in a short distance by laser transmission speed, and to judge the uniformity inside the engineering structure.
4 Summary
According to the above analysis, the application of non-destructive testing technology in road engineering can not only improve the project quality, extend the service life of the project, but also save engineering costs. In road engineering, non-destructive testing technology mainly includes laser detection technology, ultrasonic detection technology, image technology, spectrum analysis technology, etc. With the development of science and technology in China, non-destructive testing technology must be continuously improved, and it will be made for the development of road engineering in China. Make a bigger contribution.
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