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oe1(光电查) - 科学论文

3 条数据
?? 中文（中国） ▾

  • An air-coupled ultrasonic sensor based on cascaded fibre Bragg grating and Fabry-Perot interference cavity

    摘要： In this paper, we proposed and demonstrated experimentally an air-coupled fiber-optic ultrasonic sensor, based on cascaded fibre Bragg grating (FBG) and Fabry-Perot interference (FPI) cavity. Because of the modulation effect of FPI cavity, the sensor’s responses to ultrasonic wave (UW) have been improved. With side-band filtering technology-based intensity interrogation, the voltage responses of 1.2 V and 1.34 V to the continuous and pulse UW at 1 MHz respectively are obtained in air, and its SNR is about 37 dB. Further results of the directivity and stability of the sensor indicate that the sensor has the potential of imaging in air.

    关键词： Fibre Bragg grating,Air-coupled,Ultrasonic sensor,Fibre-optic sensor

    更新于2025-09-23 15:19:57

  • An ultrasonic sensor composed of a fiber Bragg grating with an air bubble for underwater object detection

    摘要： We present and experimentally demonstrate a novel optical fiber ultrasonic sensor composed of a fiber Bragg grating (FBG) with an air bubble for underwater object detection. The air bubble is formed by splicing etched FBG and single mode fiber (SMF) with taper-shaped holes. And because of the corrosive action, the diameters of FBG and SMF reduces from 125 μm to dozens of micrometers, which will be conducive to improving the sensor's performances. The experiment results indicate that the sensor has high voltage responses of 6.3 V and 7.1 V to the continuous and pulse ultrasonic wave (UW) at 1 MHz and could be used for underwater objects imaging with high signal-to-noise ratio (SNR). Subsequently, the environmental temperature will not influence ultrasonic measurements using the sensor on account of the low temperature sensitivity of 19.5 pm/°C.

    关键词： Ultrasonic sensor,Fibre Bragg grating,Fibre-optic sensor,Underwater object detection

    更新于2025-09-09 09:28:46

  • [IEEE 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Nara, Japan (2018.10.9-2018.10.12)] 2018 IEEE 7th Global Conference on Consumer Electronics (GCCE) - Performance Evaluation of Flexible Electret Sensor Array for Ultrasonic Object Detection in Short Distance

    摘要： Ultrasonic object detection in short distance could contribute the monitoring of human life activity and remote operation of home appliances. In this study, Ultrasonic sensor array using flexible electret elements were fabricated to detect objects in short distance. The reflection waves were clearly detected at short distance. The object (PVC pipe) detection was examined using the ultrasound generated by the ECS array. The estimated distance was good agreement with the true value though large errors were observed for the estimated angles because only three receivers were used for ECS array.

    关键词： flexible sensor,electret,object detection,ultrasonic sensor,in-home activity recognition

    更新于2025-09-04 15:30:14