第三届新型光电探测技术及其应用研讨会征文通知

正http://www.csoe.org.cn/NDTA2016/光电探测技术是现代信息获取的主要手段之一,光电探测技术的发展是随着其他关键技术的发展而发展的,由于激光技术、光波导技术、光电子技术、光纤技术、计算机技术的发展,以及新材料、新器件、新工艺的不断涌现,光电探测技术取得了巨大发展。近年来,光电探测技术引起了业内人士的普遍关     

专题征稿

正光纤传感技术经过五十多年的学术研究与技术发展,近几年来出现了加速发展的趋势。这是由于一方面,光纤传感技术已经在若干个实际应用场景中获得了大量应用;另一方面,微纳技术、材料技术和生物技术的发展和交叉应用也为光纤传感技术提供了许多交叉感测的新方法和新途径。我国经济的快速发展,不仅为光纤传感技术的实际应用提供了广阔的市场,同时也助推了这一领域基础研究的繁荣与进步。     

纤维光学的新进展

本文回顾了纤维光学的发展,并对近十多年来的发展作了评述。指出,低消耗光学纤维和梯度折射率透镜的出现和发展,光学纤维传感器的广泛应用,塑料光纤和红外光纤的迅速发展使纤维光学发展到一个新阶段,促进了通信技术、应用光学技术、检验技术发生重大变革。本文还对纤维光学今后的发展进行了讨论。     

中国光纤传感40年

概述了中国光纤传感器(OFS)近40年发展的历史和现状,回顾了该技术领域发展的三个阶段:迅速发展和制定国家规划阶段,技术和市场不成熟陷入低谷阶段和进入市场走产业化道路阶段。从典型OFS技术及其应用、新型OFS技术与仪器发展这两个方面,概述了中国学者所取得的主要技术成果,包括:光纤Sagnac干涉仪及其在陀螺领域的应用;光纤迈克耳孙、马赫-曾德尔干涉仪在水声探测、石油勘探、地声探测方面的应用;光纤光栅传感技术及其在火灾报警中的应用;分布式OFS技术及其在智能结构与建筑领域的典型应用;光纤法布里-珀罗传感技术与应用以及新型OFS传感技术和生物医学应用。阐明了中国OFS研发交流平台的发展及其对OFS学术发展与技术促进的重要作用。指出了目前中国OFS技术发展过程中所面临的问题,宏观上总结了OFS发展的经验并展望了其发展前景。     

第四届新型光电探测技术及其应用研讨会征文通知

正2017年10月18-20日西安http://www.csoe.org.cn/meeting/NDTA2017/光电探测技术是现代信息获取的主要手段之一,光电探测技术的发展是随着其他关键技术的发展而发展的,由于激光技术、光波导技术、光电子技术、光纤技术、计算机技术的发展,以及新材料、新器件、新工艺的不断涌现,光电探测技术取得了巨大发展。近年来,光电探测技术引起了业内人士的普遍关注,在军事和民用领域占     

石英增强光声光谱技术研究进展

石英增强光声光谱（QEPAS）技术是一种新颖的气体探测技术,具有体积小、灵敏度高等优点,是痕量气体检测技术的研究热点。本文对QEPAS技术的基本原理、发展历史及发展现状进行了综述,并对多种不同结构的QEPAS系统发展情况进行了介绍,最后对该技术的发展前景进行了展望。     

透析直读光谱仪的行业发展动态

光谱技术是一门历史久远的传统技术,从1666年牛顿第一个色散实验开始,就注定了它的不朽。随着光电技术的发展,光电直读光谱仪成为光谱技术重要发展领域,成功造就了一个伟大的产业,为近现代的材料科学及其他科学领域的发展做出了重要贡献。     

浅析测试仪器的现状及发展趋势

随着电子技术、计算机技术、通信技术以及自动化技术的高速发展,对测试仪器的检测速度、准确度和检测功能等方面提出了更高的要求,而这些技术的发展也推动了测试仪器的迅速发展。现代监测和传感技术、显示技术、数字信号处理技术和系统理论研究,都为测试过程的数字化、智能化、网络化创造了条件。在它们的推动下,仪器仪表技术不断进步,出现了以计算机为核心的自动测控系统,测试仪器也从早期简单的模拟式、数字式仪表,发展到现在的智能化仪表、虚拟仪器、网络化仪器等先进的微机化仪器。总体来看,测量仪器主要经历了从传统仪器到智能仪器、虚拟仪器和网络化仪器四个发展阶段。     

基于偏振成像技术的目标探测研究进展及分析

简述了利用偏振成像技术进行目标探测的物理特性,介绍了偏振成像技术的应用优点,概括分析了我国利用偏振成像技术进行目标探测的发展状况,指出了发展中存在的问题,叙述了国外在该研究方向所取得的主要成就。总结分析了基于偏振成像技术的目标探测的研究进展,并对其未来发展方向进行了展望。     

同步辐射X线光刻

X线光刻是未来亚微米应用的重要微光刻技术、近年来,同步辐射X线光源的应用是技术上一个重要发展,本文叙述了同步辐射X线光刻在微电子技术未来发展中的作用、现状及其基本技术问题。并介绍了我国同步辐射X线光刻的发展情况。     

Janossy Densities. I. Determinantal Ensembles

We derive an elementary formula for Janossy densities for determinantal point processes with a finite rank projection-type kernel. In particular, for =2 polynomial ensembles of random matrices we show that the Janossy densities on an interval I can be expressed in terms of the Christoffel–Darboux kernel for the orthogonal polynomials on the complement of I.     

Graduation of electron spectrometer intensity scale. Part 1. A theoretical approach

We consider an ordinary spectrometer equipped with a dispersing field analyser (e.g. cylindrical mirror analyser (CMA)), an electron multiplier, and analogue differentiation facilities. Transformation of the true energy distribution of secondary electrons to the spectrometer output voltage is described mathematically using a spectrometer operator. Conditions are established that allow the mathematical expression of the operator to be reduced to a graduation function G(E′) of pass energy E′. The G(E′) function is defined as the product of a probability function definite integral and a multiplier gain coefficient. The operator and/or the graduation function take account of influences of any extraneous fields on the spectrometer output voltage.     

The E.S.R. spectrum of irradiated ammonium hypophosphite

Electron spin resonance spectra of irradiated crystals of ammonium hypophosphite (NH₄)⁺(H₂PO₂)^- indicate that the ionic radical H[Pdot]O₂ ^- is initially formed. The hyperfine interaction tensor of the phosphorus nucleus has the principal values 1698, 1228 and 1228 Mc/s. Interaction with the proton gives rise to an almost isotropic hyperfine coupling of 230 Mc/s. These results indicate that the species H[Pdot]O₂ ^- is irregular tetrahedral in shape, the unpaired electron occupying a hybrid σ orbital centred on the phosphorus nucleus.

There is evidence that the radical H[Pdot]O₂ ^- reacts with an adjacent H₂PO₂ ^- ion forming the species O₂[Pdot]-PHO₂ ⁼. The principal values of the hyperfine interaction tensors of the two phosphorus nuclei are 1365, 944, 921 Mc/s and 527, 362, 359 Mc/s respectively. The proton has an isotropic hyperfine coupling of 90 Mc/s. The spectra of irradiated deuterated crystals confirmed this analysis.     

Graduation of electron spectrometer intensity scale. Part 2. How to do it

Graduation function G(E′) absolute values have been determined experimentally for the first time for the intensity scale of an ordinary Auger electron spectrometer. The determination of G(E′) includes creation of an original standard signal and measurement of the consequent reaction of the spectrometer using a “giant rectangular modulation” operation mode, integration of the measurand, and use of an original G(E′) definition. The experimental values of G(E′) are presented in the correct dimensional units for a pass energy range E′ = 150–1000 eV. A non-monotonous behaviour of G(E′), a strong dependence of G(E′) on the multiplier entrance bias voltage, and a discrepancy between the graduation functions of spectrometers of the same type with CMA are demonstrated. Possibilities are predicted for a similar G(E′) determination for other types of spectromer.     

Trilocal structures. I. Secular equation

The principles used with the bilocal photon are applied to the analysis of trilocal structures. From the trilocal wave equation, and the phase-space boundary condition (that the structure float on a Fermi sea filling the vacuum), a secular equation is obtained, an eighth-order polynomial in the energy of the structure. Requiring that the structure move as a particle, withw ²=k ²+m ², provides explicit expressions for two auxiliary parameters, and, to be used later in an expansion of the wave function.     

Kinetic evaluation of an i.v. bolus of MR contrast media

Currently, it is assumed that the pharmacokinetic properties of the first minutes of an I.V. MR contrast media bolus are similar to those of an i.v. iodinated contrast media bolus used in CT. Correct timing of an MRA examination is crucial for obtaining sufficient arterial contrast. This study sought to evaluate the temporal change of arterial signal intensity within 150 s after i.v. bolus injection of Gd-DTPA. Thirty consecutive patients (14 women/16 men; mean age: 51 +/- 11 years) were prospectively examined with a 1.0 Tesla clinical scanner. A single axial slice was acquired in 1.25 sec with manufacturer provided gradient echo sequence through the aorta at the level of the renal arteries. Investigation was started simultaneously to the application of contrast media (0.1 mmol/kg bodyweight Gd-DTPA at three different rates 2 mL/sec, 3 mL/sec and 4 mL/sec) and repeated for 2.5 min. An additional echo Doppler examination excluded patients with any cardiac disorders. Maximum signal (1300% increase compared to the basic value) in the aorta was achieved 20 +/- 6 sec after start of bolus injection. Then a plateau phase was maintained for the remaining investigation time (2.5 min). No significant difference was shown for different injection rates. After a bolus injection of Gd-DTPA the arterial contrast remains on a high level for at least 2 min. However, correct timing of the bolus arrival is still crucial to discriminate arteries and veins. An injection rate between 2 mL/sec and 4 mL/sec has no influence on early contrast media dynamics.     

Study of a circuit-breaker arc with self-generated flow. I. Energytransfer in the high-current phase

This study deals with the first phase of operation, corresponding to the energy transfer between arc and gas and to the pressure rise. The experimental study is devoted to measurements of current, arc voltage, and pressure variations in N₂ and SF₆. For currents of the order of 10 kA the mean measured electric field was about 32 V/cm in SF₆ and 36 V/cm in N₂. Through a bibliographical study and a modeling approach of the interruption arc, an analysis of the role of the different mechanisms of energy transfer between the arc and SF₆ was conducted. With a 10 kA pulse, about 80% of the transfer is found to be due to convection and the rest to radiation from the arc. This transfer results in an overpressure of nearly 1 bar in SF₆ and 2 bar in N₂. It appears that the operation of this type of circuit breaker is limited to high currents: for currents below 7 kA the overpressure is lower than 0.5 bar, which does not provide efficient blowing at current zero     

香豆素440/荧光素钠/藏红混合染料体系的光谱研究

通过对C440/Fl.Na/Saf.-T三元混合染料体系的荧光光谱研究,了解到这三种染料之间有较充分的能量转移。又通过对C440/Fl.Na和Fl.Na/Saf.-T两个混合染料体系的荧光寿命测量,讨论了分子间能量转移过程和机理,并做了一些定量的分析。     

New spinor representation of Maxwell's equations. I. Generalities

A new representation of the electromagnetic field tensor has been found. In this representation it is shown that an intimate relationship exists between electromagnetism and spin; the duality rotation of the already unified theory is shown to coincide with the Touschek-Nishijima transformation of the theory of leptons. A nonlinear spinor equation equivalent to Maxwell's equations is deduced.