GEINTRA is a Spanish research group from the Department of Electronics of the University of Alcala. The group has developed a method and a sensor system for the detection and counting of the train’s axles. This sensor may be used to verify the integrity and speed of the railway convoys. This method and sensor system is characterized by its high auscultation speed. With this solution the measurements are made without physical contact with any element of the train, it has total immunity to electromagnetic interference (absence of electronics in the pathway) and to the sensor vibration. The group seeks railway related companies to achieve licensing agreements with technical collaborations and commercial agreements.
New and innovative aspects
Axles detector without any electronics included in the track
Completely immune to electromagnetic interference and sensor’s vibration
Main advantages of its use
- Significantly increases the safety in railway transport.
- No electronics in railway are required.
- The system is immune to electromagnetic interference.
- There is no mechanical wear of the components.
- The system is immune to vibration.
Nowadays there are rail systems solutions to detect the train axles. One of which is the use of electromechanical and optical pedals which sends out an electrical signal when it is pressed by a wheel. Those solutions have the disadvantage that the physical contact with the wheels or track causes physical wear and the life expectancy is short. Also in high-speed trains it may skip the step of consecutive axles due to the inertia of the mechanical parts of the sensors.
Other solutions, which do not require physical contact with the trains, are electromagnetic sensors, which are not commonly used because they have problems related to the difficulty of their location. There are also possible faults arising from their sensitivity to the relative position of the transmitter, the receiver and the vibration. In addition, those systems can suffer electromagnetic interferences by the surrounding environment, so that they do not meet the reliability requirements demanded by the railway systems. In some cases they require electronics on track, which is another negative factor in its detection reliability. Eliminating electronics in the track, together with the immunity to electromagnetic interference systems are two of the priority criteria on any safety-related system in railway environments.
In order to resolve those problems, a non-invasive optical sensing system has been designed which detects the wheels without including any electronics in the tracks. This system is completely immune to electromagnetic interferences. Furthermore, by the method used for the measurements is immune to the sensor system vibration.
The invention proposed is based on a millisecond detection precision at the moment when a wheel passes through the point where the optical sensor head is located. To get that objective, the system uses a time of flight camera, an infrared light emitting source, an optical fiber bundle, an optical head, a separator or splitter, two optical fiber bundles terminals, a focusing optics to the time of flight camera, a focusing optics to the emitting source of light and a synchronization card.
The time of flight camera functioning is based on the principle that each of the captured pixels determines the distance from the sensor to the object. Furthermore, this type of camera captures information regarding the light intensity that reaches each pixel, providing two arrays of data, one corresponding to the intensity levels and other one of distances between a point in the scene and the sensor.
The light emitter work in the infrared spectrum to ensure day and night system’s effectiveness even in extreme light conditions. Furthermore, strategies which reduce the effect of ambient lighting are used.
From the data arrays captured with the time of flying camera, the system calculates the instant in which each of the wheels passes through the point where the optical sensor head is located.
- Detection and counting of the train’s axles
Intellectual property status
Secret know how
Current development status
Desired business relationship
The group seeks railway related companies to achieve licensing agreements with technical collaborations and commercial agreements.