Abstract
Fiber-optic interferometric sensor for monitoring automobile and rail traffic
Highlights
Today there are many sensors and systems for vehicle detection based on different principles and with different functionalities
We analyzed the effect of the sensor location on the vehicle detection quality
Two passive detection systems placed 50 m and 1.3 km away from the control room were used to measure tunnel vibrations triggered by passing trains free from the effect of any unrelated electromagnetic interference (EMI) existing in the subway tunnel
Summary
Today there are many sensors and systems for vehicle detection based on different principles and with different functionalities. In the case of automobile vehicles, the most commonly used technologies are inductive loops and magnetic sensors, pneumatic sensors, piezoelectric sensors, and CCTV (closed circuit television) technology. Inductive loops and magnetic sensors are based on the principle of induction changes in the electromagnetic field. These types of sensors are placed below the road surface. Due to their simplicity and reliability, they are among the most commonly used detectors [2,3]. Pneumatic sensors fall into the category of portable technology with very easy installation. They are based on measuring the changes in pressure in the pipe placed in the road. Piezoelectric sensors are devices that measure changes in pressure converted to an
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