激光光散射仪及应用

介绍激光光散射仪的测定原理,常用测定仪器、测定方法以及在聚合物研究中的实际应用。     

基于51单片机的透光式孔洞检测仪设计

工业生产板带过程中,由于原料不稳定、工艺控制波动和设备异常等因素,会引入多种缺陷,孔洞属于引入的典型的严重缺陷。该文设计的孔洞检测仪相对于人工检测和影像检查具有检测精度高,投入成本低,易于现场安装和维护等多种优点,有很好的应用前景。     

基于散射光功率比值测量的抗扰浊度探测器

针对水下长期在线浊度探测需考虑器件不稳定以及出光窗口污染对探测精度的影响等问题,提出了一种使用双散射光功率比值表征浊度的探测方法.该方法使用一束平行光照射待测环境,并滑光路同时探测两点的90°散射光功率;然后,对获得的两个散射光功率值进行比值处理,以此得到待测环境的浊度.使用该方法设计了一种新的浊度探测结构,该结构满足...     

Differential capacitance sensor as position detector for a magnetic suspension densimeter

A differential capacitance sensor has been used in the servosystem of a magnetic suspension densimeter to detect the position of a magnetic buoy. This type of sensor has not previously been used in this application. Its design, performance, and advantages are described.     

压缩态光场在激光干涉仪引力波探测器中的应用

激光干涉仪在引力波发现中起着关键作用,标准量子极限是干涉仪灵敏度进一步提高的主要障碍,压缩态光场注入是超越标准量子极限的重要手段。分析了压缩态光场的主要特点,讨论了压缩态光场的产生机制,介绍了压缩态光场技术在超越标准量子极限中的应用。     

The effect of detector size on the signal-to-noise ratio in confocal polarized light microscopy

We introduce a signal-to-noise ratio in an attempt to suggest an optimum pinhole size for confocal polarized light microscopes. We find that pinhole sizes which are typically 60% greater than those used in nonpolarized light confocal microscopy are appropriate.     

Wire GEM detector

A wire GEM (WGEM) detector with a gas gap between meshes was constructed. The detector provides the amplification 5 × 10⁴ for the gas mixture of Ar + 20% CO₂ at atmospheric pressure. As compared with well-known GEM detectors produced by perforation the plastic plate metallized on both sides the WGEM does not suffer from breakdowns between its electrodes and the effect of accumulation of charges on holes’ walls is absent. As a result the WGEM has high reliability and stability.     

The CLEO detector

The construction and performance of a large aperture magnetic detector designed for use at the Cornell Electon Storage Ring is descr bed.     

The photomultiplier tubes in the light sensor of an orbital detector for studying the fluorescent radiation of extensive air showers

The characteristics of the photomultiplier tube used in a photodetector of fluorescent radiation and the arrangement of its power supply and control systems are described. The photodetector is used to observe extensive air showers from near-Earth orbit under varying conditions of the night sky background.Translated from Pribory i Tekhnika Eksperimenta, No. 1, 2005, pp. 108–111.Original Russian Text Copyright © 2004 by Garipov, Khrenov, Lubsandorzhiev, Belyanchenko, Smolitskiy, Salazar, Fokitis.     

Absolute beam brightness detector

In generally accepted emittance measurement, main attention is concentrated on emittance areas ?(x), ?(y) occupied by desired part of ion beam in transverse phase space and shape of these areas. The absolute beam phase density (brightness) as usually is not measured directly and the average beam brightness B is calculated from a beam intensity I and the transverse emittances. In the ion source and low energy beam transport (LEBT) optimization, it is important to preserve the beam brightness because some aberration of ion optic and beam instabilities can decrease the brightness of the central part of ion beam significantly. For these brightness measurements, it is convenient to use an absolute beam brightness detector with the brightness determination from one short considered in this article.     

A multielectrode X-ray detector

A multielectrode vacuum photoemission detector for X-ray tomography of plasmas at the ITER facility is described. The detector characteristics have been investigated with an X-ray source. The spectral response of the detector to X-ray photons with energies of 3–30 keV has been determined. The spatial and angular dependences of the X-ray detection efficiency are presented. The useful signal of the ITER facility has been estimated.     

一种新的鲁棒恒虚警检测器

本文基于自动删除单元平均(ACCA)方法和单元平均(CA)方法,提出了一种新的恒虚警检测器(ACGCA-CFAR)以提高CFAR检测的抗干扰性能.它的前沿和后沿滑窗分别采用ACCA和CA方法产生两个局部估计,然后取最大值作为背景噪声功率水平估计.在SwerlingII型目标假设下,推导出ACGCA在均匀背景下虚警概率Pfa的解析表达式,并与现有方案进行了比较,仿真和试验数据处理结果表明:ACGCA-CFAR在均匀背景和非均匀背景下均具有相当好的检测性能,而它的样本排序时间只有OS和ACCA的1/4.     

A microcantilever-based pathogen detector

The ability to detect small amounts of materials, especially bacterial organisms, is important for medical diagnostics and national security issues. Engineered micromechanical systems provide one approach for constructing multifunctional, highly sensitive, real-time, immunospecific biological detectors. We present qualitative detection of specific Salmonella enterica strains using a functionalized silicon nitride microcantilever. Detection is achieved due to a change in the surface stress on the cantilever surface in situ upon binding of a small number of bacteria. Scanning electron micrographs indicate that less than 25 adsorbed bacteria are required for detection.     

基于STM32的手持式地震波检波器测试仪研制

针对国内外产品优点和克服缺点的基础上,通过研究地震波检波器测试仪所基于的测量原理,引入了STM32F10X和带触摸屏的液晶显示器,设计出了功耗小、便于携带、存储容量大、工作稳定,能够及时准确测量地震波检波器是否处于正常工作状态的地震波检波器测试仪。     

便携数字式超声探伤仪

介绍了超声检测在起重运输机械中的应用,在分析超声波探伤原理的基础上,提出超声波探伤系统的硬件和软件设计方法.该系统用于起重运输以及其相关的行业,是安全作业和运行的有力保障.经过长时间的运行,证实系统工作稳定、性能良好.     

高效液相色谱法-蒸发光散射检测器结合化学计量学方法测定硫酸卡那霉素注射液中卡那霉素A

将高效液相色谱法-蒸发光散射检测器和化学计量学方法结合起来,建立了一种新的测定硫酸卡那霉素注射液中卡那霉素A含量的方法。考察了流动相的种类、比例以及检测器的条件等对测定的影响。实验确定的色谱条件为：C18色谱柱（200mm×4．6mm,5μm）;流动相为甲醇：水（50：50）;蒸发光散射检测器;漂移管温度50℃;增益50。实验结果表明,该方法的RSD为6．5％。根据经化学计量学方法处理后的图谱计算样品中卡那霉素A的含量为0．08g／mL。     

A γ detector movement system of the spectrometer with a vertex detector setup

The system controlling movement of the γ detector in the spectrometer with a vertex detector (SVD) setup has been upgraded. The choice of circuitry components for designing the control interface, coordinate sensors, actuation mechanisms, and system of emergency shutdown is substantiated. The circuit designs allowing the reliability of the γ detector and its positioning accuracy to be increased are described. Commercially produced industrial controllers of asynchronous motors with frequency steering are used in the system. The software developed for controlling the γ detector movement is described. The system has been completely mounted and tested and now is ready for operation as a part of the SVD setup.     

轴承钢鉴别仪设计

为避免轴承制造过程中出现的钢种混料问题,研制了轴承钢种鉴别仪,经过使用,效果良好,解决了混料问题。