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Selection of Special Optical Multimeters for Rail Transit Use

Optical multimeters for rail transit primarily include high-resolution laser scanners and fiber Bragg grating (FBG) sensors, chosen based on measurement type, speed, and environmental conditions. Key Optical Measurement Technologies1. Laser Scanners: High-resolution laser scanners are widely used for measuring rail profiles, track geometry, contact wire wear, and tunnel structures.

These systems can capture hundreds of profiles per second at speeds exceeding 100 km/h, providing precise 3D data for maintenance planning and long-term monitoring. They are effective in detecting small objects and wear patterns, independent of lighting conditions, and are suitable for continuous monitoring along extensive track sections (Fraunhofer IPM). 2.

Fiber Bragg Grating (FBG) Sensors: FBG sensors are embedded along rails to measure strain, deflection, and dynamic loads. They offer high sensitivity, immunity to electromagnetic interference, and can be multiplexed for distributed measurements over long distances.

FB

G sensors are particularly useful for monitoring track transitions, differential settlement, and stiffness variations, providing real-time data for structural health monitoring (OSU/FRA). 3.

Grating-

Based Optical Fiber Sensors: These include tilted fiber Bragg gratings and long-period fiber gratings. They detect strain, temperature, and vibration by monitoring shifts in reflected wavelengths. These sensors are compact, corrosion-resistant, and easily integrated into existing rail infrastructure, making them ideal for both point measurements and continuous monitoring (MDPI review).

Selection Criteria

When selecting optical multimeters for rail transit, consider the following: Measurement Objective: Choose laser scanners for geometric profiling and FBG sensors for strain and dynamic load monitoring. Operational Speed: Ensure sensors can operate at the required train speeds without loss of accuracy. Environmental Conditions: Optical fiber sensors are preferred in harsh environments due to their resistance to corrosion and electromagnetic interference.

Integration and Data Processing: Systems should support automated data acquisition and AI-based analysis for efficient maintenance planning. Coverage: Distributed sensors are suitable for long track segments, while point sensors are better for localized monitoring.

Practical Applications

Track Geometry Monitoring: Laser scanners and FBG sensors detect rail misalignments, buckling, and wear. Contact Wire and Overhead Line Monitoring: Laser scanners measure wear and position of multiple contact wires simultaneously. Tunnel and Clearance Inspection: High-resolution optical systems capture tunnel geometry, wall surface conditions, and moisture content.

Structural Health Monitoring: FBG sensors provide continuous strain and vibration data to prevent failures and optimize maintenance schedules. Conclusion: The optimal selection of optical multimeters for rail transit depends on the specific monitoring requirements, operational conditions, and desired data resolution. Combining laser scanning for geometric measurements with FBG-based optical fiber sensors for strain and dynamic monitoring provides a comprehensive solution for modern railway infrastructure management.

Selection of Special Optical Multimeters for Rail Transit Use

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Technical note

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