宽视场大相对孔径星敏感器光学系统设计

介绍了一种用于卫星姿态控制的星敏感器光学系统,该光学系统焦距为51 mm,相对孔径为1/1.1,视场角为21°×21°（圆视场2ω＝30°）,光谱范围为0.5～0.85 μm,采用了复杂化双高斯结构.与普通成像系统不同的是,该系统要求对不同光谱的恒星所采集到的点像能量中心是一致的,且星像点像的弥散圆须控制在一定的范围内.具有倍率色差小、轴上和轴外能量分布比较一致的特点.     

A selective artemisinin-sensor using metalloporphyrin as a recognition element entrapped in the Au-nanoparticles-chitosan modified electrodes

An amperometric artemisinin (ARN) sensor based on the supramolecular recognition of glycosylated metalloporphyrin, which is included in the Au-nanoparticles-chitosan film coated on the glass carbon electrodes, was developed. For the improvement of the selectivity of artemisinin detection, 5,10,15,20-tetrakis[2-(2,3,4,6-tetraacetyl-β-d-glucopyranosyl)-1-O-phenyl]porphyrin (T(o-glu)PPH) metal complex [FeT(o-glu)PPCl] was synthesized and employed as a ARN-sensitive and -selective material in the amperometric sensors. The proposed [FeT(o-glu)PPCl]/Au-nanoparticles modified electrodes showed excellent selectivity and sensitivity toward ARN with respect to a number of interferents and exhibited stable current response, which can be attributed to the coordination of ARN with the [FeT(o-glu)PPCl] in the electrodes. The calibration graph obtained with the proposed sensor was linear over the range of 1.8 × 10⁻⁷-1.7 × 10⁻⁹ mol l⁻¹, with a detection limit of 1.7 × 10⁻⁹ mol l⁻¹ for ARN. Significant advantages of the proposed procedure over the conventional reductive electrochemical methods are the selective detection and the relatively low applied potential requirement of the ARN-sensor. The prepared sensor is applied for the determination of ARN in plant samples and the results agreed with the values obtained by the pharmacopoeia method.     

光纤法-珀传感器监测混凝土固化期收缩应变的实验研究

本文介绍了光纤法-珀应变传感器的基本原理及优点,并用其进行了混凝土固化过程中的收缩应变监测实验,在混凝土两天的固化过程中监测到了130微应变的收缩应变.本文还对光纤法-珀应变传感器的温度稳定性能进行了理论分析及对比实验,实验结果表明,在一定条件下环境温度对光纤法-珀应变传感器的影响可忽略不计,因此可不用任何温度补偿.     

光纤Sagnac温度传感器

介绍了一种新型的基于光纤Sagnac干涉仪的高精度光纤温度传感器———光纤Sagnac温度传感器。讨论了此传感器的测温原理,推导了被测温度与传感器输出之间的关系,设计并调测了一个具体传感器系统。实验结果表明,此温度传感器具有很高的精度和大的测量范围。     

Vibration analysis of a new polymer quartz piezoelectric crystal sensor for detecting characteristic materials of volatility liquid

We present a new polymer quartz piezoelectric crystal sensor that takes a quartz piezoelectric crystal as the basal material and a nanometer nonmetallic polymer thin film as the surface coating based on the principle of quartz crystal microbalance (QCM). The new sensor can be used to detect the characteristic materials of a volatile liquid. A mechanical model of the new sensor was built, whose structure was a thin circle plate composing of polytef/quartz piezoelectric/polytef. The mechanical model had a diameter of 8 mm and a thickness of 170 μ. The vibration state of the model was simulated by software ANSYS after the physical parameters and the boundary condition of the new sensor were set. According to the results of experiments, we set up a frequency range from 9.995850 MHz to 9.997225 MHz, 17 kinds of frequencies and modes of vibration were obtained within this range. We found a special frequency f_sp of 9.996358 MHz. When the resonant frequency of the new sensor’s mechanical model reached the special frequency, a special phenomenon occurred. In this case, the amplitude of the center point O on the mechanical model reached the maximum value. At the same time, the minimum absolute difference between the simulated frequency based on the ANSYS software and the experimental measured stable frequency was reached. The research showed that the design of the new polymer quartz piezoelectric crystal sensor perfectly conforms to the principle of QCM. A special frequency value f_sp was found and subsequently became one of the most important parameters in the new sensor design.     

An optical fibre pH sensor based on dye doped mesostructured silica

This paper describes the synthesis and optical pH sensing properties of a pH indicator dye activated mesostructured silica coated optical fibre. The pH-sensitive dye bromothymol blue was incorporated into the mesostructure sol precursor and thin films/coatings were used for pH-sensing applications without prior removal of the surfactant. The pH sensitivity range and operating wavelength were analysed by absorption measurements on layer dip-coated on glass slides. The pH sensing properties of coated optical fibre were tested by evanescent wave method. Experiments were carried out by using a series of solutions of known pH. No leaching was observed (except at very high pH) and an excellent reversibility was obtained between pH=2 and 5.     

电控发动机喷油脉宽的分析

本文介绍了利用喷油脉宽大小的变化来分析电控发动机电控系统、燃油供给等系统故障的一种方法,在汽车故障检测与诊断中有着广泛的应用。     

基于MSP430单片机的自动灌溉演示装置

介绍了基于MSP430F149单片机的自动灌溉演示系统的软硬件设计.该系统通过单片机控制温湿度传感器和光强传感器,实现对环境相对湿度、温度、光强实时采集与处理,演示自动灌溉植物.     

用于气象观测的阵列式温度传感器流体动力学分析与实验研究

传统百叶箱和防辐射罩内部的温度传感器受到太阳辐射会导致其温度高于大气真实温度, 升温量可达0.8 K甚至更高. 为提高大气温度观测精度, 本文设计了一种阵列式温度传感器. 利用计算流体动力学方法分析计算该传感器在不同环境条件下的辐射升温量, 采用遗传算法对计算结果进行拟合, 获得辐射升温量修正方程. 为验证阵列式温度传感器的实际性能, 研制了强制通风温度测量平台. 将阵列式温度传感器、配有传统防辐射罩的温度传感器和强制通风温度测量平台置于相同环境下, 进行大气温度观测比对实验. 配有传统防辐射罩的温度传感器辐射升温量平均值为0.409 K; 与前者相比, 阵列式温度传感器的辐射升温量仅为0.027 K. 这种阵列式温度传感器可将辐射升温引起的误差降低约93%. 辐射升温量实验测量值与修正方程修正值之间的平均偏移量为0.0174 K, 均方根误差为0.0215 K, 该结果验证了计算流体动力学方法与遗传算法的准确性. 如果配合计算流体动力学方法与遗传算法, 温度测量精度有进一步提高的潜力.     

四端光纤补偿网络的理论分析

强度干扰是阻碍强度调制光纤传感器发展及应用的关键问题.研究表明,光纤网络补偿方法对抑制强度干扰是一种行之有效的方法.作者经过深入的研究,提出了一种先进的四端光纤补偿网络结构.本文对四端光纤补偿网络进行了全面、系统的分析,揭示了网络的特性.这对于强度调制光纤传感器的发展及应用具有重要的意义.同时,对于强度调制光学测量系统也具有一定的意义.