Note: Continuing improvements on the novel flat-response x-ray detector

This note describes multi-updates of the novel flat-response x-ray detector in fabrication technology, experimental application, and data uncertainty evaluation. Unlike the previous design, the compound filter is combined into one piece through an improved fabrication process that greatly enhanced its self-supporting capability. A method of pinhole-array imaging is introduced into the experimental application process to stop any debris from the hohlraum and to uniformly reduce the radiation flux. The experimental results show that this method works well. Furthermore, a method of uncertainty evaluation of the radiation flux measurement by the novel flat-response x-ray detector has been developed. The influence of the radiation spectrum to the flux measurement is analyzed. The evaluation shows that the relative uncertainty of the radiation flux is about 10% in higher radiation temperature condition (Tr > 150 eV) and 16% in lower radiation temperature condition (Tr < 100 eV).     

Portable (3)He detector cryostat for the far infrared

A portable (3)He cryostat for far infrared detection applications is described. The cryostat has been used for a number of years in aircraft- , observatory- , and laboratory-based research. Some related studies of various bolometric materials are also reported.     

Note: a high performance pulse energy detector for Q-switched laser based on photoacoustic effect

A high performance pulse energy detector is developed based on photoacoustic effect. Different from the detectors reported before which also utilized photoacoustic effect, our detector can measure the energy of each pulse output from a Q-switched laser and monitor the pulse energy fluctuation in real time owing to the signal processing circuit designed. By comparing with a commercial laser energy meter, our detector is proved to be of high sensitivity and accuracy. We test the detector under illumination of different pulse energy at varied wavelengths, and the results demonstrate that the detector has a broad spectral response and a dynamical energy range. Besides, the measurements of this detector will not be affected by the background light according to the principle of photoacoustic effect.     

全自动抑尘剂喷洒系统的研制

研制了铁路运煤车全自动抑尘剂喷洒系统,向车厢内的煤层表面均匀喷洒一层抑尘剂,极大降低了煤炭运输过程中的煤损耗问题。喷洒系统根据运煤车的型号、运行速度自动调节喷管高度及喷洒速度,并控制喷嘴滚筒旋转以防止抑尘剂喷洒到车厢连接空档处,并克服了车厢前部喷洒不足而尾部过量喷洒的问题,降低了抑尘剂喷洒成本,减少了操作人员。该系统已成功应用于实际生产中,运行状况表明:该系统喷洒效果稳定可靠,操作方便,具有良好的推广价值。     

MAST YAG Thomson scattering upgrade alignment system

The recent upgrade to the MAST YAG Thomson scattering while enhancing the diagnostic capabilities increased the complexity of the system. There are eight YAG lasers now operational, doubling the number from the previous setup. This means alignment between each laser individually and reference points is essential to guarantee data quality and diagnostic reliability. To address this issue an alignment system was recently installed. It mimics the beams alignment in MAST by sampling 1% of the laser beam that is sent into a telescope which demagnifies by a factor of 8. The demagnified beam is viewed with a CCD camera. By scanning the camera the profile and position of the beams in the scattering zone and in a range of several meters inside MAST can be determined. Therefore alignment is checked along the beam path without having to sample it inside the vessel. The experimental apparatus and test procedures are described.     

Note: characterization of CaF2/acetone bandpass photon detector with Kr filter gas

A modified design of a CaF(2)/acetone bandpass photon detector that uses Kr as a filter gas to tune the energy resolution is presented. Our design combines two standard single window detector tubes to build the Kr filter gas chamber. Synchrotron radiation has been used to determine the energy resolution of the detector, as a function of Kr pressure. The improvement in the detector energy resolution by 250 meV compared to the CaF(2)/acetone detector is better than that reported earlier. Substantial variation in the shape of the CaF(2)/acetone detector response functions is observed for different acetone pressure (≤3 mbar), and anode voltage (≤800 V). Our analysis reveals that the changes in the shape of the detector response function are associated to different regions of the detector operation.     

Optoelectronic scanning system upgrade by energy center localization methods

A problem of upgrading an optoelectronic scanning system with digital post-processing of the signal based on adequate methods of energy center localization is considered. An improved dynamic triangulation analysis technique is proposed by an example of industrial infrastructure damage detection. A modification of our previously published method aimed at searching for the energy center of an optoelectronic signal is described. Application of the artificial intelligence algorithm of compensation for the error of determining the angular coordinate in calculating the spatial coordinate through dynamic triangulation is demonstrated. Five energy center localization methods are developed and tested to select the best method. After implementation of these methods, digital compensation for the measurement error, and statistical data analysis, a non-parametric behavior of the data is identified. The Wilcoxon signed rank test is applied to improve the result further. For optical scanning systems, it is necessary to detect a light emitter mounted on the infrastructure being investigated to calculate its spatial coordinate by the energy center localization method.     

航空货运重量复核系统的改造

本文简要地介绍了GM8803称重管理机和计算机技术相结合在航空物流企业中的实际应用，分析了其主要功能及实现方式。     

基于ISP技术的远程智能升级系统

在系统可编程技术(ISP)是20世纪90年代迅速发展起来的一种新技术.本文以8位微处理器AT89S51为例介绍了ISP的实现方法,研究并实现了一种基于RS-485总线的远程升级系统,系统通过上位机软件,对RS-485总线上的从机进行升级、调试.     

Note: A novel integrated microforce measurement system for plane-plane contact research

The evaluation of plane-plane contact force has become a big issue in micro-/nano research, for example in microassembly. However with the lack of effective experimental equipments, the research on plane-plane contact has been limited to theoretical formulations or virtual simulation. In this paper, a microforce sensor and precision parallel robot integrated system is proposed for the microforce measurement of plane-plane contact. In the proposed system, the two objects are fixed on the parallel robot end-platform and the microforce sensor probe tip, respectively, and the high precision robot system is employed to provide six degree-of-freedom motions between both objects. So it is convenient for the microforce measurement between the planar objects with different orientations. As a significant application, the proposed system is utilized for measurements of pull-off force between planar objects, in which the validation of the system is demonstrated in practice. The proposed microforce measurement system is generic, which can be extended to a variety of microforce measurements in plane-plane contact.     

Note: Programmable data acquisition system for research measurements from meteorological radiosondes

A programmable data acquisition system to allow novel use of meteorological radiosondes for atmospheric science measurements is described. In its basic form it supports four analogue inputs at 16 bit resolution, and up to two further inputs at lower resolution, configurable instead for digital instruments. It also provides multiple instrument power supplies (+8 V, +16 V, +5 V, and -8 V) from the 9 V radiosonde battery. During a balloon flight encountering air temperatures from +17 °C to -66 °C, the worst case voltage drift in the 5 V unipolar digitisation circuitry was 20 mV. The system liberates a new range of low cost atmospheric research measurements, by utilising radiosondes routinely launched internationally for weather forecasting purposes. No additional receiving equipment is required. Comparisons between the specially instrumented and standard meteorological radiosondes show negligible effect of the additional instrumentation on the standard meteorological data.     

A double detector system for BSE and SE imaging

The double detector system described here is a simple device suitable for any SEM. It permits efficient imaging of specimen surfaces in either the secondary electron (SE) or backscattered electron (BSE) mode. The BSE detector is an annular single-crystal scintillator made of yttrium aluminium garnet (YAG) and the SE detector has a scintillator of the same material. Both detectors have their own light guides which are connected to a single photomultiplier. The choice of signal is made with a mechanical diaphragm mounted on a flange between the light guide and the photomultiplier. The SE detector may be replaced by a second BSE detector to allow the detection of “low” take-off angle BSEs to provide information which differs from that given by the annular BSE detector which operates to detect BSEs with a “high” take-off angle. In this way it is possible to image either material or topographic contrast with high resolution and to take advantage of the choice of detected electrons.     

循环流化床锅炉除灰系统的改造

论述用气力输送装置代替机械除尘装置，解决了原来除尘设备除尘效果不好而且不能正常运行的问题。