Bell Textron and PhotonFirst Technologies have signed a memorandum of understanding to develop fiber optic sensing technology for structural health monitoring (SHM) in rotorcraft. Announced on October 15, 2026, the agreement will focus on advancing the integration of optical sensors into Bell aircraft to monitor structural condition and support maintenance decisions throughout service life.
The sensing technology uses optical fibers containing Fiber Bragg Grating (FBG) sensors to measure parameters such as strain, temperature, pressure and structural shape. Changes in the light reflected at specific wavelengths allow the system to capture physical changes in monitored structures. PhotonFirst also develops photonic integrated circuit-based interrogators to process these optical signals.
For composite aircraft structures, embedded fiber optic sensors can provide data on strain, deformation and structural loading without relying on conventional electrical sensing networks. Multiple sensing points can be incorporated into a single lightweight fiber, reducing cable routing, installation complexity and added system weight. The optical sensors are also inherently immune to electromagnetic interference and can operate in demanding temperature environments.
The partnership will explore how this information can support a shift from scheduled inspections and preventive maintenance toward condition-based and predictive maintenance. Monitoring structural behaviour during operation could help maintenance teams identify changes requiring further inspection, improve aircraft availability and reduce maintenance costs. The announcement does not specify which Bell aircraft or structural components will be assessed first.
PhotonFirst brings more than 20 years of experience developing fiber optic sensing systems for demanding environments. Its technology has been applied to aerospace monitoring tasks, including rotor blade monitoring, where sensors can measure structural condition and loads. The Bell agreement will focus on maturing the technology and advancing its integration into rotorcraft applications.
The memorandum establishes a framework for further technical development rather than announcing a completed aircraft installation or certification milestone. Future integration work will need to address sensor placement, installation reliability and the interpretation of collected structural data before the technology can support operational maintenance programmes at scale.
Source: PhotonFirst Technologies | News
