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基于盒膜结构的微弯式长周期光纤光栅气压传感器研究 被引量:3
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作者 刘宏月 曾捷 +1 位作者 梁大开 王晓刚 《仪器仪表学报》 EI CAS CSCD 北大核心 2009年第8期1692-1696,共5页
利用长周期光纤光栅(LPFG)谐振光谱随弯曲曲率变化的敏感特性,通过设计特制LPFG-膜盒封装结构,研制了一种基于微弯特性的长周期光纤光栅气压传感器。根据ANSYS数值分析和实验结果表明,在0.02~0.25 MPa气压范围内,长周期光纤光栅的透射... 利用长周期光纤光栅(LPFG)谐振光谱随弯曲曲率变化的敏感特性,通过设计特制LPFG-膜盒封装结构,研制了一种基于微弯特性的长周期光纤光栅气压传感器。根据ANSYS数值分析和实验结果表明,在0.02~0.25 MPa气压范围内,长周期光纤光栅的透射率不断增强,透射谱中谐振峰幅值从16.712 dB降至6.495 dB,与所测气压值之间呈现良好对应关系,并且谐振峰波长也红移1.54 m,气压传感器的灵敏度可达到4.086 8×105 dB/hPa。该传感器系统在所测气压范围内显示出较好的灵敏性和重复性,能够满足气象及飞行器高度监测中对气压测量的要求。 展开更多
关键词 长周期光纤光栅 气压传感 弯曲 谐振峰幅值
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基于气压传感技术的农村公路交通量调查新方法
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作者 王征 《交通建设与管理》 2014年第5X期147-149,共3页
在分析了浙江省当前农村公路交通量调查现状后发现,调查过程中还是主要以人工观测为主。为了解决人工观测过程中存在的人力成本高、准确率低的问题,提出了一种基于气压传感技术的农村公路交通量新型调查设备。该设备可自动采集交通量信... 在分析了浙江省当前农村公路交通量调查现状后发现,调查过程中还是主要以人工观测为主。为了解决人工观测过程中存在的人力成本高、准确率低的问题,提出了一种基于气压传感技术的农村公路交通量新型调查设备。该设备可自动采集交通量信息,并能有效识别各种车型。经试验后发现,该设备具有较高的采集精度,可满足实际使用需求。 展开更多
关键词 农村公路 交通量调查 气压传感技术
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光纤气泡微腔传感技术 被引量:2
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作者 刘申 廖常锐 王义平 《应用科学学报》 CAS CSCD 北大核心 2018年第1期104-147,共44页
基于光纤气泡微腔的干涉仪在光纤传感领域中已经获得广泛关注.结合最新研究进展,给出了一种电弧放电法制备光纤气泡微腔的新技术,该技术仅利用商用光纤熔接机且无需辅助设备.系统研究了基于光纤气泡微腔的法布里-珀罗干涉仪的工作原理... 基于光纤气泡微腔的干涉仪在光纤传感领域中已经获得广泛关注.结合最新研究进展,给出了一种电弧放电法制备光纤气泡微腔的新技术,该技术仅利用商用光纤熔接机且无需辅助设备.系统研究了基于光纤气泡微腔的法布里-珀罗干涉仪的工作原理、制备方法及传感应用,实现了基于矩形气泡微腔的光学回音壁模式谐振器,进一步完成了腔模式的应变调谐. 展开更多
关键词 光纤 气泡微腔 法布里-珀罗干涉仪 回音壁谐振器 气压传感 应变
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基于游标效应的并联法布里-珀罗干涉仪传感特性的分析 被引量:3
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作者 罗春晖 陈晓旭 吴舜 《光学学报》 EI CAS CSCD 北大核心 2023年第5期23-30,共8页
针对应用高阶谐波游标效应时出现的内包络消失、外包络可见度低等问题,从理论分析和实验探索两方面出发,得出了降低传感腔和参考腔的光强差异可以提高光谱质量的结论。此外,通过合理设计优化传感腔与参考腔的腔长、折射率等影响游标放... 针对应用高阶谐波游标效应时出现的内包络消失、外包络可见度低等问题,从理论分析和实验探索两方面出发,得出了降低传感腔和参考腔的光强差异可以提高光谱质量的结论。此外,通过合理设计优化传感腔与参考腔的腔长、折射率等影响游标放大倍数的参数,在实验上采用平行结构的法布里-珀罗干涉仪制成了一阶谐波游标效应的光纤气压传感器,不仅获得了高对比度的游标干涉光谱,还在10~190 kPa气压范围内,实现了152 pm/kPa的气压灵敏度,线性度高达99%,对应的放大倍数可达到35.3。 展开更多
关键词 光纤光学 光纤 气压传感 光学游标效应 游标光谱
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基于LoRa无线通信的变电站火灾报警系统设计 被引量:11
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作者 赵志浩 卢超波 +1 位作者 陶洪平 沈伟 《电子与封装》 2022年第7期69-72,共4页
针对目前变电站内火灾监测的不足,提出了一种基于LoRa无线通信的变电站火灾报警系统。系统通过监测探火导管气压变化判断火灾是否发生,采用LoRa无线通信代替传统的有线通讯,可减少施工工序,缩短施工周期,有利于后期的系统维护。试验证... 针对目前变电站内火灾监测的不足,提出了一种基于LoRa无线通信的变电站火灾报警系统。系统通过监测探火导管气压变化判断火灾是否发生,采用LoRa无线通信代替传统的有线通讯,可减少施工工序,缩短施工周期,有利于后期的系统维护。试验证明系统可以准确快速监测到火灾的发生,并通过LoRa将报警信息传输给消防主机,可以代替有线系统,在变电站设备区域快速部署。 展开更多
关键词 火灾监测 气压传感 LoRa通讯 CKS32
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MEMS sensor technology 被引量:4
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作者 Jiang Zhuangde 《Engineering Sciences》 EI 2012年第5期16-25,共10页
Since 1992 the author has led research group in Xi'an Jiaotong University to investigate and develop micro-electro mechanical systems(MEMS) sensors,including pressure sensor,acceleration sensor,gas sensor,viscosit... Since 1992 the author has led research group in Xi'an Jiaotong University to investigate and develop micro-electro mechanical systems(MEMS) sensors,including pressure sensor,acceleration sensor,gas sensor,viscosity & density sensor,polymerase chain reaction(PCR) chip and integrated sensor etc.This paper introduces the technologies and research results related to MEMS sensors we achieved in the last 20 years. 展开更多
关键词 MEMS SENSOR CHIP
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Effect of roadway turnings on gas explosion propagation characteristics in coal mines 被引量:12
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作者 Zhu Chuanjie Lin Baiquan +1 位作者 Ye Qing Zhai Cheng 《Mining Science and Technology》 EI CAS 2011年第3期365-369,共5页
In order to reveal the effect of turnings on explosion propagation, experiments were performed in three different pipes (single bend, U-shaped pipe and Z-shaped pipe). Flame and pressure transducers were used to tra... In order to reveal the effect of turnings on explosion propagation, experiments were performed in three different pipes (single bend, U-shaped pipe and Z-shaped pipe). Flame and pressure transducers were used to track the velocity at the explosion front. When the pipes were filled with methane, the explosion strength was significantly enhanced due to the turbulence induced by increasing the number of turnings, while the flame speed (Sf) and peak overpressure (ΔPmax) increased dramatically. In addition, the strength of the explosion increased in violence as a function of the number of turnings. However, when the bend was without methane, the turnings weakened the strength of the explosion compared with the ordinary pipe, shown by the decrease in the values of ΔPmax and Sf. In addition, the propagation characteristics in a U-shaped pipe were similar to those in a Z-shaped pipe and the values of APmax and Sf were also close. The results show that the explosion propagation characteristics largely depend on gas distribution in the pipes and the number of turnings. The different directions of the turnings had no effect. 展开更多
关键词 Gas explosion Turning Flame speed Peak overpressure Explosion propagation
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A Study of the Unsteady Tip Flow Field of a Transonic Compressor 被引量:3
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作者 JingXuan Zhang Chengqin Li +1 位作者 Hongwu Zhang Weiguang Huang 《Journal of Thermal Science》 SCIE EI CAS CSCD 2011年第1期1-5,共5页
An experimental investigation on the unsteady tip flow field of a transonic compressor rotor has been performed.The casing-mounted high frequency response pressure transducers were arranged along both the blade chord ... An experimental investigation on the unsteady tip flow field of a transonic compressor rotor has been performed.The casing-mounted high frequency response pressure transducers were arranged along both the blade chord and the blade pitch.The chord-wise ones were used to indicate both the ensemble averaged and time varying flow structure of the tip region of the rotor at different operating points under 95% design speed and 60% design speed.The pitch-wise circumferential transducers were mainly used to analyze the unsteadiness frequency of the tip leakage flow in the rotor frame at the near stall condition.The contours of casing wall pressure show that there were two clear low pressure regions in blade passages,one along the chord direction,caused by the leakage flow and the other along the tangential direction,maybe caused by the forward swept leading edge.Both low pressure regions were originated from the leading edge and formed a scissor-like flow pattern.At 95% design speed condition,the shock wave interacted with the low pressure region and made the flow field unsteady.With the mass flow reduced,the two low pressure regions gradually contracted to the leading edge and then a spike disturbance emerged. 展开更多
关键词 TRANSONIC COMPRESSOR unsteady flow
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A new method of rapid quality detection of vacuum insulation panels
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作者 WANG ShaoJie FENG YongJian +2 位作者 HUANG YuanQing WU JunChao YE YongHan 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第8期1602-1609,共8页
A new method of measuring gas pressure in vacuum insulation panels(VIPs)is reported in this study,which provides a fast and efficient quality control option of production.Although there are different methods of measur... A new method of measuring gas pressure in vacuum insulation panels(VIPs)is reported in this study,which provides a fast and efficient quality control option of production.Although there are different methods of measuring gas pressure for VIPs,connecting an internal measurement gauge to external data acquisition units is problematic.The thin high barrier film covering the panel’s core usually prevents external electrical wires or mechanical devices being connected to the inside of the VIPs.To solve this problem,a micro capacitive pressure sensor with 0 to 250 Pa detection range is developed to detect the vacuum pressure.The sensor has high linearity and a sensitivity of 10 mV/Pa.Moreover,through the communication mode study,an ultrasound communications system for VIPs is designed.It shows from operation that this system is stable and reliable,and quick for communication speed.This new method enables the quality detection of VIPs to be completed within 1 second.The minimum detectable pressure of VIPs is below 1 Pa,and the measurement error can be controlled around 5%. 展开更多
关键词 vacuum insulation panels quality detection pressure sensor ultrasonic communication
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