FBG Sensor Array for Reactor Temperature Monitoring

The patent replaces traditional thermocouple-based electrical measurement systems with optical fiber-based measurement systems. The FBG sensor uses optical wavelength shifts to detect temperature changes, eliminating the electrical components that are susceptible to electromagnetic interference and corrosion. This substitution of measurement principle fundamentally resolves the reliability-precision contradiction by using an inherently more robust sensing mechanism.

The patent employs FBG sensors whose Bragg wavelength shifts in response to temperature changes. By monitoring the wavelength shift parameter rather than electrical resistance or voltage, the system achieves high measurement precision while maintaining reliability in harsh environments. The optical wavelength parameter is immune to electromagnetic interference and corrosion effects.

The patent implements continuous real-time temperature monitoring through the FBG sensor array, which continuously measures temperature at multiple positions simultaneously. The optical fiber network and demodulation system enable uninterrupted data acquisition, eliminating the periodic inspection gaps inherent in manual methods while maintaining operational simplicity through automated sensing.

The patent uses optical fiber sensors that can be distributed throughout the reactor to create multiple measurement points simultaneously. This allows the system to capture temperature information from numerous locations in real-time, effectively creating a comprehensive temporal and spatial copy of the thermal field without requiring manual intervention at each point.

The patent divides the temperature monitoring task into multiple segments by deploying an array of FBG sensors at different axial positions within the reactor. Each sensor monitors a specific zone, and the collective array provides comprehensive coverage of the entire reactor volume. This segmentation approach achieves complete monitoring coverage while maintaining relatively simple device architecture through the use of a single optical fiber containing multiple sensors.

The patent transitions from single-point monitoring to distributed spatial monitoring by arranging FBG sensors along the axial dimension of the reactor. This dimensional expansion from one point to multiple points along a line enables comprehensive coverage of the reactor's thermal profile without proportionally increasing device complexity, as all sensors are integrated into a single optical fiber system.