基于Labview的光纤传感器相位解调技术

介绍了相位调制型光纤传感器解调原理以及当前常用的解调方法,详细论述了基于3×3耦合器的无源零差对称解调原理及基于Labview软件开发平台的相位解调方法.实验结果显示该方法可实现对相位调制信号的准确解调.与传统硬件解调方法相比,该方法具有易于开发、便于实现微机处理等突出特点.     

光纤曲率传感器的特性测试与分析

研制了一种新型光纤曲率传感器,通过在光纤表面加工敏感区,放大因被测结构变形引起光纤弯曲所造成的光传输损耗,而最终获得的光损耗就是被测结构变形的信息,非常适合用于智能结构宏弯变形的测量。在实验特性测试中,设计出悬臂梁、简支梁及标准圆柱体机构,并通过精密放大电路,完成对光纤曲率传感器的静态特性、动态特性及方向性测试。     

三相光学电流传感器的实验研究

提出了一种用于测量电力系统三相电流的光学电流传感器系统，建立了基于法拉第磁致旋光效应的三相光学电流传感器系统的数学模型，对三相光学电流传感器进行了实验研究。实验结果与理论分析的结论是一致的。研究结果对改进三相光学电流传感器的设计，提高三相光学电流传感器的性能具有重要的指导作用。     

嵌埋式偏振光纤传感器用于电流变材料可控结构的振动测试

电流变材料结构的动态特性随外加电场而改变，使之成为重要可控结构．本文研究了嵌埋式偏振光纤传感器在该类结构振动测试中的应用．讨论了有关问题并观察到了结构自然频率及模态振幅衰减随外加电场的改变．实验证明，该方法具有抗电磁干扰，不接近结构表面等优点．     

Modulation of presynaptic nAChRs on postsynaptic GABA receptor in optic tectum of juvenile<Emphasis Type="Italic">Xenopus</Emphasis>

Using the blind patch-clamp technique with the whole-cell mode,we have studied the modulation presynaptic receptor on postsynaptic γ-raminobutyric acid (GABA) receptor measuring miniature inhibitory postsynaptic currents (mIPSCs)in optic tectum of Xenopus during critical peroid.It was demonstrated that compared with mature neurons,mIPSCs recorded from immature neurons had smaller amplitude and longer decay time.mIPSCs are mediated by GABAa receptor.The nicotinic acetylcholine receptor agonists(carbachol,cytisine,nicotine,DMPP and so on) could increase the frequency of mIPSCs.The enhancement of mIPSCs frequency induced by nAChR agonists was calcium-dependent.However,the choline,a product of hydrolyzed acetylcholine,could not increase the frequency of mIPSCs.DH-β-E,a competitive antagonist of nAChR,blocked the increase of mIPSCs frequency induced by carbachol.Mecamyllamine,an α3β4 subtype of nAChR antagonist,also blocked the carbachol-induced enhancement of mIPSCs.On the other hand,MLA,α7 subtype of nAChR antagonist,had no effect on it .Thus,it seems that nAChR could presynaptically modulate the mIPSCs and α3β4 subtype of nAChR might be involved.But α7 nAChR subtype of nAChR would not be involved.The modulation is calcium-dependent.Meanwhile,we found that Ca^2 -free solution could elicit giant PSCs.The frequency of mIPSCs also is related with the level of HP.     

永济市CATV前端的维护与管理

根据永济市的实际情况,文章从几个方面阐述了有线电视的维护与管理,以确保设备的正常运行。     

Two Sorts of Fiber Optic Sensor Monitoring the Cure Process of Composite Laminate

Two new sorts of fiber optic sensor are designed.Firstly, the variation of refractive index of resin surrounding the embedded fiber optic was mean to observed by measuring the speckle spatial spectrum at the end-face of the fiber optic.Secondly, it is proposed to measuring the change of thickness of the laminate by using fiber optic microbend attenuation.The experiment results measured by the fiber optic sensors are given.The first sort of sensor was found to be able to detect the viscosity process of the resin matrix during cure process includeing the minimum point of viscosity, the gelation point and the end point of cure process; the second sort of sensor could detect the course of change of the thickness of composite laminate pressed by operation pressure.It is benefit for us to optimize the operation technology and to establish the intelligent monitoring system about curing process of composites for the reason that the viscosity process and the change course of the thickness of laminate can be monitored.     

Measurement of creep of optical fiber by a low coherent white light double interferometer system

The creep properties of optical fiber used in fiber optical sensors were studied in this paper.A low coherent white light double interferometer system was designed and calibrated and the creep deformations of optical fibers under static and cyclic loadings were measured with this device.The research results showed that polymer coated optical fibers crept at the beginning when they were under static or cyclic load.As the number of the cyclic loading or the static loading times increased the creep tended to s...     

天冬氨酸对家鸽顶盖脑片Ⅱa—f层神经元电活动的影响

利用离体脑片技术，在５１例家鸽顶盖脑片上用玻璃微电极胞外记录了家鸽顶盖Ⅱａ－ｆ亚层神经元的自发放电活动。根据家鸽顶盖Ⅱａ－ｆ 层神经元自发放电活动的特征，将Ⅱａ－ｆ亚层神经元自发放电分为３种类型：慢而不规则型、快连续型和周期性簇状放电型。天冬氨酸（Ａｓｐ）对不同形式放电单位的作用均以兴奋为主，这种兴奋作用能被Ｎ－甲基－Ｄ－天冬氨酸（ＮＭＯＡ）增强，Ｄ－α－氨基－己二酸（Ｄ－α－ＡＡ）能阻断ＡＳＰ的     

卡距曲线测距精度的分析

本文介绍广泛应用于反坦克反装甲直射武器系统的测瞄合一光学瞄准镜卡距曲线测距精度的分析与计算方法及其优越性。