共查询到20条相似文献,搜索用时 109 毫秒
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光纤光栅作为新型传感元件,因为其具有抗电磁干扰和分布式测量等电学传感器无法比拟的优点,正在被广泛的研究.为了实现替代现有的高精度电学温度传感器的目的,可以尝试利用光纤光栅对温度和应变共同敏感的特性,制作高灵敏度光纤光栅温度传感器.尽管已经出现了对高灵敏光纤光栅温度传感器的报到,但是,很少有针对高灵敏光纤光栅温度传感器稳定性的研究.在实验室环境下,我们对高灵敏光纤光栅温度传感器的稳定性进行了测试.我们制作了一款高灵敏光纤光栅温度传感器,将其与普通光纤光栅温度传感器和电学石英温度传感器共同置于盛满水的不锈钢容器中,观测室温变化.通过对它们两周的观测结果进行对比,我们发现:尽管与普通光纤光栅温度传感器的结果相比,高灵敏光纤光栅温度传感器的观测结果与石英温度传感器的结果更一致;但是,高灵敏光纤光栅温度传感器出现了微小漂移.因为该漂移出现在进一步拉伸光纤光栅的过程中,所以它很可能是由于光纤光栅的固定点出现了微小滑动造成的.这为光纤光栅在高精度温度测量领域的应用作了有益尝试. 相似文献
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光纤传感技术未来地震监测的发展方向 总被引:3,自引:0,他引:3
利用光纤传感器进行地震前兆观测是一种独具优势的地震监测新手段。 光纤传感器具有高精度、 抗电磁干扰、 不存在零漂、 易于组网以及适于长距离传输等一系列独特优势, 可以解决地震前兆观测中电学测量仪器存在的固有问题。 介绍了几类常用光纤传感器的工作原理及特点, 综述了光纤传感器在地壳形变观测和地震波探测两个应用领域国内外的研究进展, 并指出了目前需要解决的问题。 研制了一套基于光纤传感器的钻孔应变、 地震波和地温同时测量的多参量钻孔综合地震观测设备, 现场实验表明, 该光纤综合钻孔地震观测设备适应地震前兆观测中对抗环境干扰能力、 测量精度、 稳定性等方面的性能要求, 具有较好的应用前景。 相似文献
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利用光纤光栅对温度和应力应变的敏感效应制成的传感器可以将温度、压力、应力、应变等物理量转换成光学量(波长),由此所构成的测量系统具有极高的稳定性,不存在零点漂移,抗干扰能力强等一系列优点.不足的是光纤光栅传感器本身灵敏度不够高,在许多场合其测量分辨率不能满足要求,特别是作为地震前兆观测的主要测量手段——应力应变测量精度要求较高.本文提出一种技术思路,即通过增敏装置来提高系统测量分辨率,理论上可以将应力应变的测量分辨率提高到10-9至10-10量级,可以满足高精度应力应变测量的指标要求. 相似文献
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地震前,泉水、井水的温度变化已有较多报道。有人曾用热敏电阻或铂电阻温度传感器进行地热前兆观测,方法虽简便,但是灵敏度低,稳定性不够好。 我们于1982年研制成功了以石英晶体做测温传感器的SZW-1型数字式钻孔温度计,下面对该温度计的原理作一简单介绍。 相似文献
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光纤传感器在水文地球化学地震前兆观测中的应用及其前景 总被引:3,自引:0,他引:3
地震科学面临步入中年的考验,观测技术的革新和进步可能是地震科学焕发青春的途径之一。光纤传感器具有本质安全,电绝缘性好、便于连网、易于实现远程和在线测量等一系列优点。光纤传感器完全可以解决目前地震水文地球化学数字化观测和活断层监测中的诸多不足,它能够提供更加准确和可靠的数据。光纤的应用,使得远程和地下深部测量成为可能,并且多个测项可以复用同一条光纤。光纤传感器在地震前兆观测中具有广泛的应用前景。 相似文献
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介绍了专用于地震前兆观测的TDT—25型地温传感器的设计原理及其各个功能模块的工作原理。文章还给出了该地温传感器的测试结果和应用图例,证明该传感器完全满足地震前兆观测的需要。 相似文献
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地电观测专用高精度数据采集器研制 总被引:1,自引:0,他引:1
针对地震地电前兆观测,研制基于ARM9平台和32位模数转换器ADS1281的地电观测高精度数据采集系统,实现了高精度和低噪声采样.本文给出地电观测高精度数据采集系统的硬件设计、软件实现和系统指标测试结果.该系统采样率可设置为1次/s至100次/s,1至6通道任意配置,通信协议符合中国地震局地震前兆台网专用设备网络通信规程,可以满足地震地电传感器信号采集和网络接入需求. 相似文献
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M. N. French R. L. Bras W. F. Krajewski 《Stochastic Environmental Research and Risk Assessment (SERRA)》1992,6(1):27-45
A procedure for short-term rainfall forecasting in real-time is developed and a study of the role of sampling on forecast ability is conducted. Ground level rainfall fields are forecasted using a stochastic space-time rainfall model in state-space form. Updating of the rainfall field in real-time is accomplished using a distributed parameter Kalman filter to optimally combine measurement information and forecast model estimates. The influence of sampling density on forecast accuracy is evaluated using a series of a simulated rainfall events generated with the same stochastic rainfall model. Sampling was conducted at five different network spatial densities. The results quantify the influence of sampling network density on real-time rainfall field forecasting. Statistical analyses of the rainfall field residuals illustrate improvement in one hour lead time forecasts at higher measurement densities. 相似文献
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《地震工程与工程振动(英文版)》2014,(4)
正This journal is established by the Institute of Engineering Mechanics(IEM),China Earthquake Administration,to promote scientific exchange between Chinese and foreign scientists and engineers so as to improve the theory and practice of earthquake hazards mitigation,preparedness,and recovery.To accomplish this purpose,the journal aims to attract a balanced number of papers between Chinese and 相似文献
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George W. Housner 《地震工程与工程振动(英文版)》2008,7(2):I0001-I0001
Destructive earthquakes have caused great damage in China and the United States and collapsing buildings havecaused many deaths and injuries. The field of earthquake engineering studies earthquake hazards, the occurrence ofearthquakes of various magnitudes, the nature of the ground shaking during an earthquake, the vibration of structuresduring earthquakes, the strengthening of existing structures and the design of new structures to be earthquake resistant,and finally, how to cope with earthquake damage and restore a city to normal functioning. Such efforts are in progressin both countries, but unfortunately, the language barrier interferes with the free flow of information between China andthe Untied States. It would be mutually beneficial if some means could be developed to promote the exchangeof information across the Pacific Ocean. This new journal has been established for this purpose and its success willbe an important step in promoting earthquake engineering in China and the United States. 相似文献
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《国际泥沙研究》2014,(4)
正President:Giampaolo Di Silvio,Italy Vice Presidents:Ulrich C.E.Zanke,Germany Zhao-yin Wang,China The World Association for Sedimentation and Erosion Research(WASER),inaugurated on Oct.19,2004,is an independent non-governmental,non-profit organization.The mission of WASER is to promote international co-operation on the study 相似文献
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JianCheng Shi 《中国科学:地球科学(英文版)》2014,57(10):2281-2282
正Global Change includes climate change and other environmental changes caused by the joint interaction among various layers of Earth. From the positive side, global change provides new opportunities to human and other living forms on Earth. In the meantime, it creates tremendous challenges and negative impact. At present, the negative impacts have reached all primary processes of the global ecosystem and every aspect of human society, especially causing degradation of the ecosystem. For instance, intensive deforestation causes decline of biodiversity; global warming causes sea level rise and increases 相似文献