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摘要: :~ 	 RSw;b.t7 RPC Photonics公司有高品质的的工程漫射体BSDF测试数据,但它对于FRED帮助甚少,下面这个步骤描述了如何利用FRED脚本转换RPC Photonics提供的TXT文件,并将数据直接应用到FRED的Tabulated scatter 散射模型。 W59 xe&l g5x>}@ONq7 背景: 7j(gW Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 r^ ' FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 bweAmSs 图1. RPC Photonics工程漫射体结构及光束投射形状 >svx
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8o).q}>& 步骤 YUyYVi7clq QF22_D<.}J 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 L.S/M v F7]8*[u 图2. RPC Photonics工程漫射体不同类型的散射数据 jR+kx:+ 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) EN,}[^Z 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 7<K=G2_: 例如下所示: H
=&K_ Sample name: EDF-C1-56 \NKw,`/ Merging data from file EDF-C1-56 0-0.txt YM. Finished merging RPC data for sample EDF-C1-56 ~E vGNnTL FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Zw<<p|{)< 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 >66
`hZ a. 创建一个新的散射库 7&w[h4Lw b. 散射模型命名 [o7Qr?RN c. 改变散射模型为“Tabulated BSDF”. Ysw&J}6e d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ta'wX e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 6?JvvS5 f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, VCIV*5
P g. 点击OK /#q6.du 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 `_]Ul I_h -[h|*G.J Im]6-#(9\| 脚本代码: `7?EE1o
YOA)paq+ '#Language "WWB-COM" fhC| =0XB tDMNpl Option Explicit lg{/5gQG zH#urF6< Sub Main w02C1oGfx yb0Mn*X+
N 'Cleanup |8)\8b|VuC ClearOutputWindow() a6;5mx 8,e%=7h_e Print "Merging RPC Photonics BSDF Data Files" (rq(y$N SetTextColor(255,0,0) mHH>qW{` Print "Note: Script should be located in the same folder as the BSDF TXT files." 'tjqfR Print "Note: Do not run this script multiple times without deleting the output file between executions." 9g.5: SetTextColor(0,0,0) wLvM<p7OX 4[Wwm 'Current directory of this script (should be the same as the text files being merged) ][YC.J Dim cDir As String k[@/N+;")` cDir = MacroDir$ & "\" ::-*~CH) n?9FJOqi 'Array which will be populated with the list of files to be merged 1(e64w@ Dim fList() As String, curFile As String 8==_43 GetFileList( cDir, fList ) b&AeIU}&
9w=[}<E Print "" 7")~JBH Print "Files found for merging:"
IA`Lp3Z For Each curFile In fList 'q@vTM'- Print Chr(9) & curFile +/" \.wYv Next j[dgY1yE: 8`90a\t'Z 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. I<+:Ho=6 Dim nameArray() As String, sampName As String \eRct_ nameArray = Split(fList(0)," 0-0.txt") D6C h6i5$ sampName = nameArray(0) Q^* 33 Print "" s%RG_"l Print "Sample name: " & Chr(9) & sampName Q8.LlE999 bL+}n8B 'Open an output file and write the FRED header data Vjd>j; H Dim outFile As String da@W6Ov x outFile = cDir & sampName & "_FRED.txt" _6g(C_m'T? Open outFile For Output As #1 Jje!*?&8X Print #1, "type bsdf_data" %36@1l-N Print #1, "format angles=deg bsdf=value scale=1" 8xkLfN|N=
,lFp4 C 'Loop the file list, skip the two header lines and write the remaining data to file s#(%u t Dim lineArray() As String, curLine As Long T8yMaC For Each curFile In fList !fjB oK+ Print "Merging data from file " & curFile 4=N(@mS ReadFile( cDir & curFile, lineArray ) yM,Y8^ For curLine = 2 To UBound(lineArray) jdx T662q Print #1, lineArray(curLine) Iyb_5 UmpF Next rZE+B25T~ Next {kr14l*2 q1m{G1W
n 'Close the output file S,Tc\} Close #1 Z9Z\2t RdNLf Print "Finished merging RPC data for sample " & sampName -=ZDfM
Print "FRED formatted data file: " & Chr(9) & outFile EBr?>hl End Sub c@J@*.q] DKkilqVM 'Utility function to read the contents of a file into an array of strings. ,_Kr}RH Function ReadFile(ByVal fileName As String, _ HV*;Yt ByRef lineArray() As String) As Long ]b:>7_la 8DM! ]L ReadFile = -1 c]/S<w< Dim oFSO As Object FW|_8q?}< Set oFSO = CreateObject("Scripting.FileSystemObject") 4yjIR? Erase lineArray 'g3T'2"`5 Wrh$`JC Dim fid As Long l,zhBnD If oFSO.fileexists( fileName ) Then &So1;RR,_M fid = FreeFile() ?GW}:'z Open fileName For Input As fid m(0X_&&?z lineArray = Split(Input(LOF(fid), fid), vbCrLf) g(,^';j Close fid @PctBS<s End If B-PX/Q Set oFSO = Nothing 5}c8v2R:B Return UBound( lineArray ) 0N$FIw2 cLw|[!5: End Function II!~"-WH l@ (:Q!Sk Sub GetFileList( ByVal in_dir As String, _ Y*S:/b~y ByRef in_flist() As String ) M|fV7g BRM!g9 'Redimension the file list array |qz%6w= Erase in_flist beSU[ Rd|8=`) 'Tracks how many files are found ZY@ntV? Dim fCount As Long K<kl2# fCount = 0 \ Ce*5h /?($W|9+l 'Recurse directory and search for text files x*=1C,C Dim f As String F\|4zM f = Dir$(in_dir & "*.txt") 9%1J..c While f <> "" k%Vprc ReDim Preserve in_flist(fCount) N"suR}9% in_flist(fCount) = f T[#q0bv fCount += 1 -4zV
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S< f = Dir$() Ks@cwY Wend 1<5Ug8q ReDim Preserve in_flist(fCount-1) ~E!kx VCJOWUEO1 End Sub $mh\`
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