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Aerospace Technology Co. Page: 20/31 Movement and protection from thruster beam 移動(dòng)與保護(hù) The movable structure will allow to mount two cameras at the same time and perform, using stepper motors, the following actions: ? Positioning of the cameras in safe position on the far side of the thruster during thruster firing (the camera boxes will have shutters to prevent any sputtering) ? Positioning of the cameras in front of the thruster to perform the measurement campaign. ? Rotation and fine positioning of the cameras to scan different areas of the thruster. 可移動(dòng)結(jié)構(gòu)一次可安裝兩個(gè)相機(jī),使用步進(jìn)電機(jī)進(jìn)行如下活動(dòng): ? 推進(jìn)器點(diǎn)火時(shí)使相機(jī)處于原理推進(jìn)器的安全位置(相機(jī)箱帶有遮光器,防止濺射)。 Interfaces 接口 Mechanical Interface 機(jī)械接口 As shown in Figure 8, the EMS will be placed on the floor of the vacuum chamber, with a supporting structure, provided by Alta to be rigidly interfaced (typically by screw/bolts) on the vacuum chamber. 如圖 8 所示, EMS將通過(guò) Alta 提供的支撐結(jié)構(gòu)穩(wěn)固的安放在真空罐底部(螺絲 /螺栓)。如有需要, 北京和德宇航技術(shù)有限公司 China Head Aerospace Technology Co. Page: 21/31 Alta 可提供支撐件的圖紙。 ? 相機(jī)在已知位置拍攝大量照片,為了更好的測(cè)量結(jié)果,拍攝的照片多于實(shí)際測(cè)試所需。二次校準(zhǔn)是為長(zhǎng)期在真空中工作后判定系統(tǒng)的相對(duì)位置。校準(zhǔn)僅執(zhí)行兩次:分別是真空罐抽真空時(shí)和恢復(fù)。 2) 推進(jìn)器關(guān)閉時(shí)拍攝照片。 ? 如采取低溫冷卻,再次重復(fù)拍攝(真空罐內(nèi)溫度的變化引起第二階段的結(jié)構(gòu)變形)。相機(jī)的信號(hào)饋入使用 USB 頻道還是 Giga 以太網(wǎng),取決于真空罐環(huán)境。圖 11 是兩種可能的設(shè)計(jì),如傾向于簡(jiǎn)易方案,則可參考第二種設(shè)計(jì)。 ? 旋轉(zhuǎn),精確定位相機(jī)可對(duì)推進(jìn)器的不同區(qū)域掃描。 EMS overall dimensions EMS 整體 尺寸 The following pictures show the IV4 EMS system installed in the facility, that has the same diameter (2 meters) of LIP’s one. The overall envelope of the structure, including the positioning in the safe zone is: ? Width of 750 mm (maximum when the arm is in the safe parking position and longest horizontal guide is used) ? Height of 550 mm ? Depth of 600 mm (maximum when the arm is in the measuring position) 下圖是安裝于設(shè)備當(dāng)中的 IV4EMS,與 510所的直徑相同( 2m)。 ? 系統(tǒng)的最大缺陷是質(zhì)量合格的 3D 圖像不斷重建,但坑 /槽定量測(cè)量的不確定度高于利用線(xiàn)形光源。因此為了連續(xù)的建立 3D 形貌,現(xiàn)在的程序需要激光線(xiàn)在不同點(diǎn)多次拍攝。相關(guān)可行性研究正在進(jìn)行,面臨的困難有: ? 金屬網(wǎng)格的反射使坑 /槽輪廓的檢測(cè)變得困難。建議推進(jìn)器關(guān)閉后經(jīng)過(guò)相同的時(shí)間等待再進(jìn)行測(cè)量,如此可保證真空罐內(nèi)的溫度分布是重復(fù)的。 3) 建議利用已知的發(fā)動(dòng)機(jī)尺寸進(jìn)行原始的校準(zhǔn) picture section,用作日后比較(圖 2)。 Erosion measurement features 腐蝕測(cè)量特點(diǎn) Linear measurement 線(xiàn)性測(cè)量 As described in section , the typical working distance of the system is supposed to be around 175 mm from the target surface. In this case, the field of view of the cameras will be around mm with a resolution of 5 m. It is therefore expected, in case of nominal illumination, to be able to measure linear distance variations of minimum 23 pixels (corresponding to 1015 m). 如 ,系統(tǒng)的典型工作距離設(shè)為距離目標(biāo)表面 175mm,因此相機(jī)的視場(chǎng)約 , 分辨率 5m,所以在標(biāo)準(zhǔn)照明條件下,可測(cè)量的最小線(xiàn)性距離變量為 23pixels( 對(duì)應(yīng) 1015m) 。報(bào)價(jià)應(yīng)對(duì)其它可能性做出詳細(xì)說(shuō)明。 組件與備用件清單應(yīng)同系統(tǒng)一起提供,并有詳細(xì)的采購(gòu)信息。 EMS 的預(yù)計(jì)壽命應(yīng)為 8 年,包括定期維護(hù)和可用的備用件。 R13 – Control software source code 控制軟件源代碼 An option in the quotation should be present concerning the possibility of purchasing the control software source code, to be able to independently modify it in the future. 可購(gòu)買(mǎi)控制軟件源代碼,以便日后可自行修改。 ? EMS 一旦故障,發(fā)出警報(bào),提供修復(fù)相關(guān)信息。最高電壓約為 1500V,最大電流 12A,電 組件應(yīng)至少能承受 2500V的電壓。 o Available power: 220 V AC 真空度: 1x103 Pa to1x102 Pa; 潔凈度:實(shí)驗(yàn)室; 溫度: 040 176。 o Cleanliness level: laboratory。 Detailed customer requirements 客戶(hù)詳細(xì)要求 R01 Target thruster grid dimensions 目標(biāo)推進(jìn)器柵極尺寸 The erosion measure should be made on grids up to 300 mm in diameter. The grids will not be plane, but curved. 對(duì)直徑達(dá) 300mm的柵極進(jìn)行腐蝕測(cè)量,柵極不非平面而是曲面。紅外相機(jī)采集的圖像通過(guò)自主研制軟件分析(圖 4是該軟件的一個(gè)截圖)。C)或 2%,單位 ℃ ? 可重復(fù)性:顯示的 1% ? 測(cè)量距離: 75mm 到無(wú)限遠(yuǎn) ? 工作溫度: 10…50 176。C ? 溫度分變率: 80 mK (range 1, 30 176。C 北京和德宇航技術(shù)有限公司 China Head Aerospace Technology Co. Page: 7/31 * Repeatability: 1% of the reading * Measuring distance : from 75 cm to “infinity” * Working temperature : 10…50 176。C, 50Hz) * Field of View (FOV) : 15176。 The infrared camera has the following characteristics: 紅外相機(jī)具有以下特性: Parameter參數(shù) Value 數(shù)值 Measuring Range 測(cè)量范圍 0800℃ Error 誤差 2% Temperature Resolution溫度分辨率 ℃ CCD size CCD 尺寸 384 X 288 px Wavelength Range 波長(zhǎng)范圍 814 μm As an option, the following more performing camera could be provided: * Sensor : microbolometric NONcooled 384 x 288 pixels * Spectral range : 8…14 micron * Measurement Range(s) : 1) 0 200 176。連續(xù)測(cè)量的最大優(yōu)勢(shì)不僅可以記錄工作數(shù)小時(shí)后的整體腐蝕情況,也可以記錄隨時(shí)間變化的腐蝕情況(因此可以了解隨時(shí)間變化的腐蝕速率)。 北京和德宇航技術(shù)有限公司 China Head Aerospace Technology Co. Page: 4/31 Figure 1 Diagnostic system for GIE erosion measurement: front view (top), System placed in a parking position when the thruster is firing (bottom) 圖 1 用于 GIE 腐蝕測(cè)量的診斷系統(tǒng),正面圖(上圖),推進(jìn)器點(diǎn)火時(shí)系 統(tǒng)處于固定位置(下圖) The system consists of a supporting structure and of an inspection optical head. The supporting structure includes the following main subsystems: 系統(tǒng)由一個(gè)支持結(jié)構(gòu)和一個(gè)光學(xué)探頭組成。推進(jìn)器點(diǎn)火時(shí),該系統(tǒng)保持在一個(gè)固定位置(圖 1底部),因此不會(huì)接觸到等離子羽流。 北京和德宇航技術(shù)有限公司 China Head Aerospace Technology Co. Page: 1/31 ALTA 公司柵極腐蝕在線(xiàn)測(cè)量系統(tǒng) 技術(shù)建議書(shū) 北京和德宇航技術(shù)有限公司 China Head Aerospace Technology Co. Page: 2/31 1 Introduction 引文 Scope 范圍 At the end of May 2020 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 Institute of Physics (LIP), to be used to assess erosion of Gridded Ion Engines. 2020年 5月底和德公司要求 Alta 為可應(yīng)用于 510( LIP)所新型真空灌的腐蝕測(cè)量系統(tǒng)( EMS)給出正式報(bào)價(jià),該系統(tǒng)用于評(píng)估柵極離子發(fā)動(dòng)機(jī)( Gridded Ion Engines)的腐蝕情況。 The Telemicroscopy diagnostic system consists of a special camera mounted on a movable structure placed