光子计数位置灵敏探测器畸变多项式校正

采用多项式校正方法对光子计数位置灵敏探测器成像畸变进行校正。介绍光子计数位置灵敏探测器工作原理并分析其畸变产生原因;介绍多项式校正原理,并给出光子计数位置灵敏探测器畸变多项式校正流程;采用该方法对两种不同畸变程度的基于楔条形阳极该类探测器进行了畸变校正,校正后残余误差分别为2.5pixel和1.2pixel。实验结果表明,多项式校正法能够有效校正光子计数位置灵敏探测器成像畸变。     

光学读出非制冷红外成像技术的光学灵敏度分析

不同于传统的非制冷红外成像技术,提出了基于微电子机械系统(MEMS)的新概念光学读出非制冷红外成像技术。它的光学读出系统基于空间刀口滤波原理,具有高灵敏度、高分辨率和高抗震性等优点,但同时也受到了反光板的弯曲变形、粗糙度等复杂因素的影响。在大量实验数据的基础上,利用夫琅禾费近场衍射理论,建立了复杂因素下光学灵敏度的理论分析模型,详细分析了刀口滤波位置、反光板的长度、曲率半径、粗糙度、LED光源的强度以及扩展宽度等对光学灵敏度的影响,并提出了通过极限操作使系统的光学灵敏度最大化的光学优化方法。     

Comparison of Amperometric and Coulometric Electrchemical Detectors for HPLC Through a Figure of Merit

Abstract

Performance characteristics of electrochemical detectors for high performance liquid chromatooraphy are difficult to predict from presently avaliable information relating response to design parameters. A fiqure of merit is proposed which allows an operational comparison to be made, based upon specific response, noise and band spread. On this basis, it is shown that a meaningful comparison of an amperometric design with a coulometric design can be obtained and that, contrary to previous predictions, this coulometric type is generally superior.     

锗-硼硅玻璃局部加热低温封接温度场研究

在光学读出非制冷红外热像仪焦平面阵列(FPA,Focal Plane Array)真空封装结构中,硼硅玻璃和双面镀增透膜的锗片分别作为透可见光和透红外光的窗口材料.由于锗窗上增透膜不能承受高温(<250℃),同时FPA也不能承受高温(<100℃),因此封装过程须在低温下进行,并对锗窗上的增透膜及FPA进行保护.本文提出了一种用于锗-硼硅玻璃低温扩散焊接的局部加热方法.该方法从导热系数较大的锗窗外表面加热(200℃),而导热系数较小的硼硅玻璃窗口外表面维持低温(60℃).有限元模拟计算结果表明,该加热过程稳态情况下待焊接区域温度约200℃,满足低温焊接的温度要求.锗窗上温度(200℃)低于250℃,且FPA区域的温升在75℃以下.用实验方法对模拟结果进行了验证,实验结果同模拟结果一致,证明该方法能够有效地保护FPA及锗窗上的增透膜.     

发光二极管诱导荧光检测器*

发光二极管诱导荧光检测器（LED-IF）是近十年来发展起来的一种微型化荧光检测器,在流动注射、毛细管液相色谱、毛细管电泳及芯片电泳等微流动分析系统中具有广泛的应用。本文讨论了LED-IF的4种光学结构,并对其主要器件,包括光源、滤光片、透镜、光纤、光电检测器以及检测池作了详细讨论,还介绍了LED-IF与其它技术的联用及其在生物、医药和环境样品检测中的应用,对未来的发展趋势作了展望。     

Compensation for thermal effects in mirrors of gravitational wave interferometers

In this paper we study several means of compensating for thermal lensing which, otherwise, should be a source of concern for future upgrades of interferometric detectors of gravitational waves. The methods we develop are based on the principle of heating the cold parts of the mirrors. We find that thermal compensation can help a lot but can not do miracles. It seems finally that the best strategy for future upgrades (“advanced configurations”) is may be to use thermal compensation together with another substrate materials than silica, for example sapphire. Received 26 April 2001     

Noise Characterization for Laser Interferometer Gravitational Wave Detectors

This work incorporates a review of the status, in Australia, of data analysis for gravitational wave detection using laser interferometers, within an overview of the present state of such research in the world generally. In this context, data analysis refers not so much to signal simulation as to what might be called the thorough process of noise characterization and the subsequent, quality-controlled signal extraction. To the extent that problems identified here arise for all currently planned instruments, there is necessarily a global component to the discussion presented. In Australia, there are unique circumstances, associated with attempting to carry out work in gravitational wave detection, which demand also a local aspect to the ensuing discussion.     

Determination of the Gamow–Teller strength function for the neutron-deficient isotopes In

The Gamow–Teller β decays of the neutron-deficient indium isotopes ^104–107In have been investigated by using total absorption γ-ray spectrometry on mass-separated sources. The experimental Gamow–Teller strength, deduced as a function of the excitation energy in the daughter nuclei ^104–107Cd, is compared to shell-model predictions.     

出境旅游网络关注度时空演变及影响因素研究——以泰国为例

网络关注度是测量潜在旅游者对目的地旅游关注情况及需求变化的重要手段之一。基于百度指数,以我国31个省（区、市）（不含港、澳、台）的泰国旅游网络关注度为研究对象,运用季节性强度指数、地理集中度指数、赫芬达尔-赫希曼指数、地理探测器等方法,探讨我国居民对泰国旅游网络关注度的时空演化规律及其影响因素。结果表明：从时序演化上看,2011—2019年泰国旅游网络关注度呈波动上升态势,可划分为快速上升期和平稳发展期2个阶段,地区季节性差异显著,3月、7月、12月为泰国旅游网络关注度的高峰时段;从空间分异上看,泰国旅游网络关注度空间分异变化不大,空间集聚趋于分散状态,整体呈“东高-西低”的阶梯状递减特征,高关注度地区主要集中在东部地区及四川省,低关注度地区则主要分布于除四川省外的西部省份;从影响因素上看,经济发展水平（人均可支配收入、GDP）、交通便利程度、贸易开放度以及国际旅游开放度共同影响泰国旅游网络关注度的空间分布格局。     

Zur Berechnung von Geometriefaktoren bei der Kernstrahlungsmessung

Der Geometriefaktor von radioaktiven umschlossenen oder offenen Strahlenquellen hängt bei der Messung mittels einer Kernstrahlungsmeßsonde von der räumlichen Anordnung der Strahlenquelle zu der strahlenexponierten wirksamen Fläche des Detektors und von der Geometrie der Strahlenquelle selbst ab. Fūr punktförmige Strahler in verschiedenen Positionen, Geraden, Kreisflächen und Zylinder wurde in möglichst einheitlicher Vorgehensweise die Berechnung der Geometriefaktoren bezüglich kreisförmiger ebener Detektionsflächen vorgenommen und rechentechnisch in Form von BESM 6-Algolprogrammen realisiert. Die Berechnungsergebnisse sind untereinander konsistent und wurden möglichst durch unabhängige Verfahren oder experimentelle Werte kontrolliert. Die Rechengenauigkeit kann gemäß den vorliegenden Anforderungen frei gewählt werden.