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Description
The ATLAS Inner Tracker at the High-Luminosity LHC requires precise environmental monitoring to ensure detector safety and long-term performance. Humidity control is critical to prevent condensation and degradation of sensitive electronics operating at low temperatures. Fiber optic sensors are well suited for this task due to their immunity to electromagnetic interference and radiation tolerance.
This work presents the integration of fiber optic humidity sensors into the ATLAS Detector Control System. Optical interrogation units read the spectral response of Fiber Bragg Grating and Long-Period Grating sensors installed in the detector volume. Each raw spectral readout is about 400 MB per sensor, which would exceed 100 petabytes over ten years at one readout per minute for 50 sensors. A dedicated software package therefore performs spectral peak detection and converts wavelengths into humidity, temperature, and radiation dose using embedded calibration models. The processed data are reduced to about 10 kB per sensor per minute, corresponding to roughly 2.6 terabytes over ten years.
A QUASAR-based OPC-UA server publishes these values to the ATLAS WinCC OA DCS, enabling real-time monitoring, alarm handling, data archiving, and control actions. This provides a scalable approach for integrating advanced fiber optic sensing into large-scale detector control systems
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