Fiber optic system design for vehicle detection and analysis

Nedoma, Jan; Zboril, Ondrej; Fajkus, Marcel; Zavodny, Petr; Kepák, Stanislav; Bednarek, Lukas; Martínek, Radek; Vašinek, Vladimír

doi:10.1117/12.2239549

Cited by 7 publications

(3 citation statements)

References 8 publications

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“…The experimental results could be used to determine the changes in the geometric condition of buildings and engineering structures. The authors of [14][15][16] focused on the use of a fiber-optic interferometer in motor vehicle traffic or for perimetric applications. A sensor on the Mach-Zehnder interferometer was constructed to detect vibration and acoustic responses caused by humans and vehicles moving around the sensor.…”

Section: State-of-the-artmentioning

confidence: 99%

Use of Fiber-Optic Sensors for the Detection of the Rail Vehicles and Monitoring of the Rock Mass Dynamic Response Due to Railway Rolling Stock for the Civil Engineering Needs

et al. 2019

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The paper describes the original results of a comparative study of the standard seismic station vs. a novel interferometric sensor for civil engineering needs. The presented results showed that to implement seismic measurements using standard seismic stations, a method using a fiber optic interferometer may serve as an alternative. We presented time records and the frequency spectra obtained from experimental measurements of the dynamic response of the upper rock mass beneath passing tram vehicles (a total of 769 passes) over a period of five months of practical measurements under various climatic conditions. The fiber-optic sensor detected all phenomena at a 100% rate, and the recorded results were compared to the results from a standard seismic station. Both sets of results were recorded simultaneously and agreed significantly, especially in terms of frequency. With regard to time, all tram vehicle axles were detected in individual time records. With regard to frequency, the results detected in the bandwidth generally correlated to rail transport for individual types of tram vehicles.

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Section: State-of-the-artmentioning

confidence: 99%

Use of Fiber-Optic Sensors for the Detection of the Rail Vehicles and Monitoring of the Rock Mass Dynamic Response Due to Railway Rolling Stock for the Civil Engineering Needs

et al. 2019

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“…Optical fiber sensors that monitor the phase of light are among the most sensitive sensors. Many research papers deal with the use of interferometers in transportation or beyond [15][16][17][18]. These papers deal with signal processing issues, circuit improvements, applications, and changes in evaluation, where appropriate.…”

Section: Introductionmentioning

confidence: 99%

New approach for speed and direction measurement by fiber optic sensor

Cubik,

Nedoma,

Fajkus

et al. 2024

Specialty Optical Fibres VIII

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Traffic monitoring is the subject of scientific publications and technical solutions, primarily due to the need to optimize and increase traffic safety. There are many systems that can determine direction, velocity, or make vehicle classifications. These can be, for example, traditional camera systems, laser gates, LIDAR scanning, pneumatic sensors, or induction loops. A non-traditional approach is the use of optical fibers as a traffic sensor. Optical fiber sensors use different technologies, one of them being sensors that evaluate the phase change of light (interferometers). The enormous sensitivity of these sensors combined with electromagnetic inertia are promising parameters for deploying system in areas that may be disturbed by magnetic fields or require special security requirements. The focus of this research is an optical fiber sensor based on the Michelson interferometer. The paper deals with the sensitivity of the measuring arm when changing its arrangement. Different configurations of the measuring fiber arrangement in relation to the objects to be monitored lead to the construction of a monitoring system with properties useful for direction monitoring and velocity measurement. This paper deals with the asymmetric configuration of the measuring arm of an optical fiber interferometer. Experiments in outdoor vehicular traffic conditions together with frequency spectrum analysis investigate the usability of the measurement system. The system itself can be extended to classify the measured objects by analyzing the amplitude frequency spectrum and using machine learning.

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“…Among other things, the team of authors has already dealt with the use of the Mach-Zehnder interferometer to measure the dynamic effects caused by tram, railway and road transport, as well as the monitoring of the dynamic effects of the construction technology, and the applicability of fiber optic sensors to the monitoring of these effects has been confirmed at the experimental level and with some limitations. [20,21]. This research is still ongoing [22].…”

Section: Introductionmentioning

confidence: 99%

Alternative Approaches to Vibration Measurement Due to the Blasting Operation: A Pilot Study

Kepák

Stolárik

Nedoma

et al. 2019

Sensors

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As the infrastructure grows, space on the surface in the urban area is diminishing, and the view of the builders is increasingly moving underground. Implementation of underground structures, however, presents a number of problems during construction. One of the primary side effects of tunnel excavation is vibration. These vibrations need to be monitored for potential damage to structures on the surface, and this monitoring is an integral part of any such structure. This paper brings an original pilot comparative study of standard seismic instrumentation with experimentally developed fiber-optic interferometric and acoustic systems for the purpose of monitoring vibration caused by the blasting operation. The results presented show that systems operating on physical principles (other than those previously used) have the potential to be an alternative that will replace the existing costly seismic equipment. The paper presents waveform images and frequency spectra from experimental measurements of the dynamic response of the rock environment, due to blasting operation performed shallowly during the tunnel excavation of a sewer collector. In the time and frequency domain, there is, by comparison, significant agreement both in the character of the waveform images (recording length, blasting operation timing) and in the spectra (bandwidth, dominant maxima).

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Fiber optic system design for vehicle detection and analysis

Cited by 7 publications

References 8 publications

Use of Fiber-Optic Sensors for the Detection of the Rail Vehicles and Monitoring of the Rock Mass Dynamic Response Due to Railway Rolling Stock for the Civil Engineering Needs

Use of Fiber-Optic Sensors for the Detection of the Rail Vehicles and Monitoring of the Rock Mass Dynamic Response Due to Railway Rolling Stock for the Civil Engineering Needs

New approach for speed and direction measurement by fiber optic sensor

Alternative Approaches to Vibration Measurement Due to the Blasting Operation: A Pilot Study

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