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We present an ultra-compact, reflective optical sensor probe based on silicon-on-insulator (SOI) microring resonator and Y-junction structure, which is capable of simultaneously achieving high sensitivity and fine resolution optical sensing. The reflective configuration of the probe enables remote measurements at locations which are otherwise hard to be assessed by transmission based sensors. As an...
An integrated photonic sensor based on an optoelectronic oscillator with an on-chip sensing probe that is capable of realizing highly sensitive and high-resolution optical sensing is presented. The key component is an integrated silicon-on-insulator based microring resonator which is used to implement a microwave photonic bandpass filter (MPBF) to effectively suppress the side modes of the optoelectronic...
Crowdsensing is regarded as an efficient way to collect a large number of sensing data by using sensor-equipped mobile phones. Most of the existing studies, which concentrate on the crowdsensing task assignment issue, often assume that there is only one data consumer in the system. Obviously, there may exist multiple data consumers in one real crowdsensing system, thus the previous works based on...
A tunable single bandpass microwave photonic filter exhibiting narrowband RF response with more than 20 dB sideband suppression ratio and an improved shape factor is proposed and experimentally demonstrated based on phase compensated silicon-on-insulator microring resonator.
Microwave photonic technologies are attractive for processing high bandwidth signals, overcoming inherent limitations with electronic approaches. Recent new developments in tunable microwave photonic signal processing are presented in the paper, including compensation techniques to achieve high-performance processors, wideband tunable time delays and phase shifting, and programmable microwave photonic...
A novel and compact optical vortex flow meter is presented and experimentally demonstrated. The proposed structure can monitor the open area liquid flow velocity based on the von Karman vortex street and floating fibre ring vortex sensor. The optical fibre ring with floating foam sphere is attached behind a bluff body to measure the vortex shedding frequency in the liquid flow. This structure of flow...
As the precondition of image recognition, the effective image segmentation plays the significant role of the following image processing. In this paper, it is proposed to apply Bayesian decision-making theory based on minimum error probability to gray image segmentation. On the assumption that the gray values accord with the probability distribution of Gaussian finite mixture model in image feature...
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