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摘要: vl<J-+|0C pGIeW}2'9 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。 { at;
U@o II91Ia 背景: ,J|};s+ 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。 89paR[ 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。 =BtEduz 图1. RPC Photonics工程漫射体结构及光束投射形状 ( ;"ICk& K +~ %_
~[+~# 步骤 >HFJm&lQ Q%7EC>V 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。 TDoYp ^.(]i\V_ 图2. RPC Photonics工程漫射体不同类型的散射数据 7,1idY%cy 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) `G'V9Xs( 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 Bg`b*(Q 例如下所示: ;Gi w7a) Sample name: EDF-C1-56 ^{s)`j'I* Merging data from file EDF-C1-56 0-0.txt ^Z*_@A _v Finished merging RPC data for sample EDF-C1-56 B$bsh. FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt v%1# y5 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 7-5q\[ZK a. 创建一个新的散射库 `#R$ b. 散射模型命名 g5E]o) c. 改变散射模型为“Tabulated BSDF”. p})&Zl)V 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 ) $\bH5|Hk] e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 oI>;O# f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, 4=9F1[ g. 点击OK I$Z"o9" 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 bfJDF(=h )6(mf2& t3M/ThIE 脚本代码: O7.Is88! WFkXz*7B '#Language "WWB-COM" #U1soZ7 w
Bl=]BW!% Option Explicit {?C7BClB /90@ 85%r Sub Main %$cwbh-{{ l- X|3 , 'Cleanup u(BYRB ClearOutputWindow() r[gV`khka {<GsM Print "Merging RPC Photonics BSDF Data Files" 8ZN J} SetTextColor(255,0,0) a%AU9?/q# Print "Note: Script should be located in the same folder as the BSDF TXT files." iz'8P-]K> Print "Note: Do not run this script multiple times without deleting the output file between executions." 4 QDW}5xB SetTextColor(0,0,0) H`y- "L8q #C+0m` 'Current directory of this script (should be the same as the text files being merged) lj[Bd > Dim cDir As String D\k);BU~ cDir = MacroDir$ & "\" T|E ;U K9*K4'#R 'Array which will be populated with the list of files to be merged UpgOU. Dim fList() As String, curFile As String :g,r l\S7 GetFileList( cDir, fList ) \F>
*d!^C T1x$v,)8x Print "" KAe)
X_R7 Print "Files found for merging:" i{`>!)U For Each curFile In fList OxD\e5r Print Chr(9) & curFile mU3UQ
j Next |BXq8Erh #
mzJ^V- 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. nBNZ@nD Dim nameArray() As String, sampName As String 97
1qr nameArray = Split(fList(0)," 0-0.txt") 9`b*Y*d sampName = nameArray(0) We" "/X Print "" BFMM6-Ve Print "Sample name: " & Chr(9) & sampName -Wmpj D`LwW` 9 'Open an output file and write the FRED header data Me8d o;
G| Dim outFile As String (Q@m;i> outFile = cDir & sampName & "_FRED.txt" Pd3t~1TaW Open outFile For Output As #1 Qc3!FW<26 Print #1, "type bsdf_data" 9)=as/o Print #1, "format angles=deg bsdf=value scale=1" `dj/Uk xOkf9k_ 'Loop the file list, skip the two header lines and write the remaining data to file xUG|@xIwc Dim lineArray() As String, curLine As Long :!3P4?a For Each curFile In fList vbSz&+52; Print "Merging data from file " & curFile 6!bf,T] ReadFile( cDir & curFile, lineArray ) Vbwbc5m} For curLine = 2 To UBound(lineArray) HHX9QebiST Print #1, lineArray(curLine) wi9fYfuv3R Next k_!z=6?[: Next YKk%lZ.8 Jb0]!*tV 'Close the output file [%b<%m}L- Close #1 9 /9,[ A V,>#!zUv Print "Finished merging RPC data for sample " & sampName !x,3k\M Print "FRED formatted data file: " & Chr(9) & outFile #|'8O End Sub 4 ba1c <H$ CCo 'Utility function to read the contents of a file into an array of strings. $CXqkK<6 Function ReadFile(ByVal fileName As String, _ | o+vpy ByRef lineArray() As String) As Long 5uu{f&?u) 1z8.wdWJ} ReadFile = -1 ZI5UQH/ Dim oFSO As Object !D z:6r Set oFSO = CreateObject("Scripting.FileSystemObject") w|>Y&/IX Erase lineArray ^goS?p/z YpuA,r;" Dim fid As Long H-I*; If oFSO.fileexists( fileName ) Then IQH;`+ fid = FreeFile() ma-|L3 # Open fileName For Input As fid f(9w FT lineArray = Split(Input(LOF(fid), fid), vbCrLf) FL` . (, Close fid zmuq4-. End If hzPpw. Set oFSO = Nothing 2!jbaSH(+ Return UBound( lineArray ) C@KYg/nYw Bw{W-&$o End Function ^%\p; yhL 8y+Gvk: Sub GetFileList( ByVal in_dir As String, _ ~L?p/3m ByRef in_flist() As String ) L*FnFRhU (L~3nN;rr 'Redimension the file list array \Ud2]^D= Erase in_flist y_J{+ Jq.26I= 'Tracks how many files are found S:DB%V3 Dim fCount As Long dAga(<K fCount = 0 N["(ZSS q/]tJ{FI 'Recurse directory and search for text files m@jOIt!< Dim f As String y*zZ }> f = Dir$(in_dir & "*.txt") b5yb~;0 While f <> "" ,E/vHI8 ReDim Preserve in_flist(fCount) 71wyZJ in_flist(fCount) = f 9WBDSx_(Q fCount += 1 `5x,N%9{ f = Dir$() dLjT^ 9 Wend !WDdq_n*v ReDim Preserve in_flist(fCount-1) c5Offnq'1 '"I"D9;9 End Sub ,kLeK{
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