Centimeter-level location of partial discharge under dual-source signal aliasing in switch cabinet using dual-end transmission fluorescent optical fiber

Dual-sensor correlation for wideband HFCT partial discharge detection and interference suppression in transformers

On-site partial discharge (PD) detection of power transformers is challenged by strong electromagnetic interferences, including converter pulsation, corona, and power-side harmonics, whose spectra overlap with PD signals. A dual-channel synchronous detection system based on self-developed wideband high-frequency curren...

An ultrasonic gas leak localization method based on mode switching

With the increasing demands for industrial safety, environmental protection, and energy efficiency, ultrasonic gas leak localization has attracted increasing attention. However, conventional single-model localization algorithms often exhibit degraded accuracy when the source-to-sensor distance varies, owing to the diff...

Additive-Noise Suppression in Interferometric Fiber-Optic Sensing Using an Intrinsic Full-Link Noninterfering Pulse

Additive-noise suppression in interferometric fiber-optic sensing often relies on auxiliary reference optics or computationally intensive back-end processing. Here, we present an intrinsic pulse-domain scheme that turns noninterfering return pulses generated by the sensing array, normally discarded during demodulation,...

Optical Frequency-Domain Reflectometry for Distributed Sensing Using Laser Current Modulation With Optical Saturation and Phase Cross-Correlation

We propose and experimentally demonstrate an optical frequency-domain reflectometry (OFDR) scheme for distributed sensing that combines direct current modulation of a telecom-grade distributed feedback laser with optical power equalization via saturable optical amplifier dynamics and phase-correlation processing. The a...

Normalized compensation method for infrared emissivity based on real-time source monitoring

Intensity/polarization-based visible/infrared dual-band composite detection system

To address the stray light interference problem faced by photoelectric detection systems in complex environments, conventional single-mode optical detection suffers from significant limitations in all-weather operation, stray light suppression, and anti-interference capability. In this paper, a visible/infrared dual-ba...