8 papers
Characterization of Event-Based Vision Sensors for High-Speed Optical Instrumentation
Tomás Lopes, Joana M. Teixeira, Tiago D. Ferreira +3
Event-based vision sensors provide asynchronous event generation and microsecond timestamp resolution, which may be useful for high-speed optical measurements. However, precise eve…
Photonic Extreme Learning Machines using Event-Based detection
Vicente Rocha, Tomas Lopes, Joana Teixeira +3
Photonic extreme learning machines use random optical propagation, detection nonlinearity, and a trained linear readout for energy-efficient and scalable optical computing. However…
Towards Neuromorphic Event-Based Sensing for High-Speed Multi-Spectral Classification and Tracking of Microparticles
Joana M. Teixeira, Tomás Lopes, Tiago D. Ferreira +3
Conventional image-based microfluidic systems face an inherent trade-off between throughput, imaging speed, and data bandwidth, limiting their ability to monitor high-velocity flow…
All-optical Edge Computing for Speckle Sensing Interrogation
Tomás Lopes, Joana M. Teixeira, Tiago D. Ferreira +3
Speckle-based sensing exploits the rich environmental information of its high-dimensional spatial intensity patterns. However, the requirement for camera-based acquisition and subs…
Quantum Imaging of Birefringent Samples using Hong-Ou-Mandel Interference
Carolina Gonçalves, Tiago D. Ferreira, Catarina S. Monteiro +1
Two-photon interference in a Hong-Ou-Mandel (HOM) interferometer can be used as a quantum sensing mechanism due to the sensitivity of the interference dip to perturbations of the p…
Event-based Speckle Interrogation for High-Bandwidth Multi-point Optical Fiber Sensing
Tomás Lopes, Joana Teixeira, Vicente V. Rocha +4
Speckle-based fiber optic sensors are well-known to offer high sensitivity but are strongly limited on the interrogation side by low camera frame rates and dynamic range. To addres…
Multimodal Speckle-polarization Fiber-optic Sensing for Localized and High-bandwidth Vibration Monitoring
Catarina S. Monteiro, Tomás Lopes, Joana Teixeira +3
High-bandwidth and multi-point acoustic and vibration sensing is a critical asset for real-time condition monitoring, maintenance, and surveillance applications. In the case of lar…
High-Precision Acoustic Event Monitoring in Single-Mode Fibers Using Fisher Information
Catarina S. Monteiro, Tiago D. Ferreira, Nuno A. Silva
Polarization optical fiber sensors are based on modifications of fiber birefringence by an external measurand (e.g. strain, pressure, acoustic waves). Yet, this means that differen…