Fig. 5: The application of LACT-based sensors for traffic and bridge vibration monitoring.
From: Laser-upgraded coal tar for smart pavements in road and bridge monitoring applications
a Experimental system for verifying vehicle monitoring. b The signals collected by the photoelectric speed measurement system and the LACT-based sensors at 10 cm/s. c, d Finite-element simulation of semirigid base asphalt pavement model to determine the placement of the sensors. e Comparison of the speed measurements between LACT-based sensors and photoelectric switches. f The miniaturized bridge model for vibration monitoring. Inset: Attachment position of the sensor. g Time-domain signals collected by sensors at different vibration frequencies. h The power spectra of the signals for the extraction of the vibration frequency
