栅极腐蚀在线测量技术项目可行性论证报告.doc
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1、 北京和德宇航技术有限公司 China Head Aerospace Technology Co.ALTA公司栅极腐蚀在线测量系统技术建议书1 Introduction 引文1.1 Scope 范围At the end of May 2013 Head Aerospace has requested Alta to provide a formal quotation for an Erosion Measuring System (EMS) to be implemented in a new vacuum chamber of the Customer, the Lanzhou Insti
2、tute of Physics (LIP), to be used to assess erosion of Gridded Ion Engines.2013年5月底和德公司要求Alta为可应用于510(LIP)所新型真空灌的腐蚀测量系统(EMS)给出正式报价,该系统用于评估栅极离子发动机(Gridded Ion Engines)的腐蚀情况。1.2 Applicable documents 适用文件The following is the complete list of documents to be considered applicable to this proposal:下表列出了可
3、适用于该投标的所有文件:1.3 Acronyms and abbreviations 首字母缩略词与缩写词首字母缩略词/缩写Meaning含义ATPAuthorization To Proceed授权进行COClose-Out完结DAQData AcQuisition数据采集EPElectric Propulsion电推进EMSErosion Measuring System腐蚀测量系统FFP Firm Fixed Price固定总价FMEAFailure Mode and Effects Analysis失效模式与影响分析FSOFull Scale Output全量程输出GIEGridded
4、 Ion Engine栅极离子发动机HETHall Effect Thruster霍尔效应推进器HWHardware硬件I/F,IFInterFace接口IRInfra Red红外线LIPLanzhou Institute of Physics510所MAIManufacturing,Assembly, Integration制造,部装,集成NDANon-Disclosure Agreement保密协议QMQualification Model鉴定样机RPARetarding Potential Analyzer减速电势分析仪SWSoftware软件TBCTo Be Confirmed/To
5、be Clarified留待确定TBDTo be Determined/Defined留待决定TCThermoCouple热电偶VDCVolt Direct Current直流电压2 Introduction 简介The present section describes the tele-microscopy and erosion facility implemented in Alta IV-4 facility.本章将介绍Alta IV-4设备所采用的远程显微镜和腐蚀测量设备。2.1 Tele-microscopy System for Gridded Ion Engines 栅极离子
6、发动机远程显微镜系统Alta provides an innovative diagnostics to measure the erosion of the grid holes in Gridded Ion Engines (GIE).Alta为栅极离子发动机网格空腐蚀情况的测量形成了一种新型的诊断方法。The Telemicroscopy diagnostic system consists of a special camera mounted on a movable structure placed inside the vacuum facility. The system is
7、 maintained in a parking position while the thruster is firing (Figure 1 - bottom), so that it does not interfere with the plasma plume. When the thruster stops firing, the Telemicroscopy system is moved in front of the thruster to perform the erosion measurement. Four led lights or a laser line bea
8、m illuminate the thruster during the image acquisition. The motion of the diagnostic system is obtained through two separate stepper motors one governing the arm rotation, the other controlling the arm translation. 远程显微诊断系统为一个专用相机固定于可移动结构上,并放置于真空设备内部。推进器点火时,该系统保持在一个固定位置(图1底部),因此不会接触到等离子羽流。推进器关闭后,远程显
9、微镜系统移动到推进器前方对腐蚀情况进行测量。图像采集时有四盏LED灯或激光线束为推进器照明。诊断系统的移动由两个分开的步进电机控制,一个控制臂的旋转,一个控制臂的移动。Figure 1 Diagnostic system for GIE erosion measurement: front view (top), System placed in a parking position when the thruster is firing (bottom)图1 用于GIE腐蚀测量的诊断系统,正面图(上图),推进器点火时系统处于固定位置(下图)The system consists of a s
10、upporting structure and of an inspection optical head. The supporting structure includes the following main subsystems: 系统由一个支持结构和一个光学探头组成。支持结构主要由以下分系统够成:l Translation stage移动台l Rotation stage旋转臂l Sustaining arm支撑臂l Protective box保护箱The optical head consists of a long working distance objective with
11、 the following characteristics: 光学探头具有长工作距离物镜,其特性如下: Parameter参数Unit单位Value数值Field of view视场mm5.33Resolution分辨率mm0.005Depth of Field景深mm0.408Working Distance工作距离mm175The measurement system allows the inspection of the acceleration grid (measurement of the hole diameter variation across a diameter of
12、 the grid). 系统也可进行加速极检测(通过一个网格的直径测量孔径的差异)。Parameter参数Unit单位Value数值GIE diameter range GIE直径范围mm50300Image resolution图像分辨率m5Field of view视场mm5.3Measurement type测量种类-Hole diameter孔径Grid deformation网格变形Working distance工作距离mm175The Tele-microscopy system has been designed with the aim of performing succe
13、ssive erosion measurements during GIE tests with no need of re-opening the vacuum chamber. This greatly reduces the risk of contamination and saves a considerable amount of time if multiple measurements are to be taken along an endurance test. The remarkable advantage of performing a series of succe
14、ssive measurements lies in the opportunity of recording not only the total erosion after a certain number of firing hours, but also a time-history of the erosion (thus providing information about how the erosion rate varies in time).远程显微系统的设计可在GIE测试时进行连续腐蚀测量,而无须再次打开真空灌,这大大减小了污染的风险,并且为耐久试验的多次测量节省了大量的
15、时间。连续测量的最大优势不仅可以记录工作数小时后的整体腐蚀情况,也可以记录随时间变化的腐蚀情况(因此可以了解随时间变化的腐蚀速率)。Figure 2 Calibration images taken on a brand new grid图2 全新网格的校准图像2.2 Infrared-Camera System for HET Temperature Measurement 用于HET温度测量的红外照相机不要温度测量的相机可节省多少成本?我们暂时不需这种功能。By using an infrared camera it is possible to monitor the temperatu
16、re of the thruster assembly during the test. Alta provides an advanced diagnostic system with the infrared camera installed right inside the vacuum chamber in order to have an optimal view of the item whose temperature has to be monitored. Besides, in this way the camera can be placed closer to the
17、thruster (w.r.t. an infrared camera placed outside the chamber and operating through one of the available viewports), resulting in a higher spatial resolution of the acquired images. 测试过程中推进器部件的温度可通过红外照相机监测。Alta提供的带有红外照相机的诊断系统科直接安装于真空管内部,以获得被测物体的最佳视图。此外,相机更加靠近推进器,可获得较高的空间分辨率(放置在真空罐外部的红外相机只能通过一个可用视点照
18、射)。The infrared camera has the following characteristics:红外相机具有以下特性:Parameter参数Value数值Measuring Range测量范围0-800Error误差2%Temperature Resolution温度分辨率0.08CCD size CCD尺寸384 X 288 pxWavelength Range波长范围8-14 mAs an option, the following more performing camera could be provided: * Sensor : microbolometric N
19、ON-cooled 384 x 288 pixels * Spectral range : 814 micron * Measurement Range(s) : 1) 0 - 200 C 2) 150 - 800 C 3) 200 - 1000 C * Temperature resolution: 80 mK (range 1, 30 C, 50Hz) * Field of View (FOV) : 15 x 12* Minimal focal distance: 0.75 m * Target image: about 280 x 205 mm 1 m distance * Pixel
20、measurement spot: 0.8 mm 1 m distance * Different possible acquisition frequencies :selectable between 50Hz, 25Hz, 12.5Hz,. * Measure uncertainty: 2K(T 100C) or 2% of the measured value in C * Repeatability: 1% of the reading * Measuring distance : from 75 cm to “infinity” * Working temperature : -1
21、050 C * Interface: Fast Ethernet (real-time 50Hz max) * 4 I/O digital ports: digital inputs (trigger), digital output (alarm) * Power Input : 1036Vcc, 5VA * Weight : about 1.6 kg * Dimensions (mm) : 85 x 175 x 107 mm * Protection : IP54以下性能较高的相机作为可选项目提供: 传感器:微测辐射热 非冷却382x288pixels 光谱范围:814 微米 测量范围:1
22、) 0 - 200 C 2) 150 - 800 C 3) 200 - 1000 C 温度分变率:80 mK (range 1, 30 C, 50Hz) 视场(FOV):15 x 12 最小焦距: 0.75m 靶像:约280x205mm1m距离 像素测量点:0.8mm1m距离 不同采集频率:可选频率50Hz,25Hz,12.5Hz 测量不确定度:所测值的2K(T 100C)或2%,单位 可重复性:显示的1% 测量距离:75mm到无限远 工作温度:-1050 C 接口:快速以太网(最大值实时50Hz) 种I/O数字分类:数字输入(触发),数字输出(警报) 电源输入:1036Vcc, 5VA 重量
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