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Ballistocardiography (BCG) is a non-invasive method for measuring the reaction force of the human body to the ejection of blood at each cardiac cycle. It is now being the subject of renewed research interest due to recent technological advancement in the field of sensors. In this paper, we summarize our work on BCG with optical fiber sensors for various applications in the past 6 years. These include...
Ballistocardiography (BCG) is a non-invasive method for measuring the reaction force of the human body to the ejection of blood at each cardiac cycle. It is now being the subject of renewed research interest due to recent technological advancement in the field of sensors. In this paper, we summarize our work on BCG with optical fiber sensors for various applications in the past 6 years. These include...
The yarn break detection system of ring spinning based on tunnel magnetoresistance effect is proposed in the paper. The TMR element is used to detect the anomaly signal caused by rotating traveler. The signal reflects the rotation speed of traveler and the yarn break is monitored by speed measurement. The yarn break sensor, section detection module, machine monitoring module are designed and implemented...
A compact open-path tunable diode laser absorption spectrometry (TDLAS) sensor has been developed for gas-phase hydrogen peroxide (H2O2) concentration monitoring during sterilization and aseptic disinfection. The sensor was based on a open-path multi-pass Herriott cell and wavelength modulated near-infrared diode laser. The sensor was calibrated by titrating the H2O2 water which was obtained by exhausting...
In this paper, a novel polarization mode dispersion (PMD) monitoring method by adding auxiliary optical signal is presented. Based on four-wave mixing (FWM), the PMD can be monitored in all-optical domain by measuring the power of the idler wave. With the help of auxiliary signal, the change trend of idler wave power with PMD will be enlarged, which expands the scope of monitoring and improves the...
Vital signs (including breath and heartbeat) monitoring is a key tool in healthcare. Current monitors need invasive electronic sensors attached to user's body, which is inconvenient and uncomfortable. We demonstrate photonic smart health monitoring system based on phase-sensitive optical fiber interferometers. Users simply lie/sleep on a sensor mat embedded with optical fiber interferometers. Breath...
The evaluation technology of water quality is of great significance for monitoring and management of surface water quality. In this paper, the Extreme Learning Machine algorithm was optimized with the Dolphin Swarm Algorithm. Optimal weight and threshold of Extreme Learning Machine algorithm was searched by the process of creating a virtual team and seeking the best position of Dolphin Swarm. Four...
The optical network management system is very important for optical equipment monitoring and managing, the timeliness and accuracy are very critical parameters. Automatic discovery of network nodes is the embodiment of automation of network management system. However, most of the traditional automatic discovery method is based on the ICMP protocol, which is to ping all the IP addresses in local area...
A high-resolution FBG sensor is proposed for crust deformation observation and earthquake monitoring. A narrow-linewidth tunable fiber laser is used to interrogate the FBG. The wavelength shift of the FBGs due to seismic signal is measured by swept optical suppressed carrier single sideband (SSB-SC) interrogation technique with a reference FBG. The self-noise level is tested to be lower than NHNM...
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