This paper analyzes the importance of asphalt pavement rutting detection in pavement maintenance and pavement administration in today’s society, the shortcomings of the existing rutting detection methods are presented and a new rutting line-laser extraction method based on peak intensity characteristic and peak continuity is proposed. The intensity of peak characteristic is enhanced by a designed transverse mean filter, and an intensity map of peak characteristic based on peak intensity calculation for the whole road image is obtained to determine the seed point of the rutting laser line. Regarding the seed point as the starting point, the light-points of a rutting line-laser are extracted based on the features of peak continuity, which providing exact basic data for subsequent calculation of pavement rutting depths.
A fiber-optic microphone based on intensity modulation has been fabricated and tested. The device possesses sufficient sensitivity to detect acoustic waves in the frequency range from 300 to 3400 Hz. The signal to noise ration is 43 dB relative to 0. 1 pa 1 KHz. Since the device has been fabricated with standard GI (50 / 125) fibers it can be built quite simple and inexpensively with higher stability and reliability. The sensor is compatible with present fiber communication systems including sources, detectors and components.