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摘要: "pOqd8>] Pa3{Ds 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。 /g13X,.H 2XzF k_6H 背景: R_t~UTfI; 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。 H3!,d`D.N 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。 Um/CR! 图1. RPC Photonics工程漫射体结构及光束投射形状 _c[|@D p 7
,f6kG x6"/z 步骤 km9Gwg/zT |Uc<;> l 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。 sq6>DuBZz f#*h^91x 图2. RPC Photonics工程漫射体不同类型的散射数据 Tw2Xe S 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) dz{#"No0 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 pTc$+Z73 例如下所示: P;^y|0Nm Sample name: EDF-C1-56 O5g}2 Merging data from file EDF-C1-56 0-0.txt Xq+!eOT Finished merging RPC data for sample EDF-C1-56 p^T&jE8])# FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt AEB/8%l};v 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ` 52%XI a. 创建一个新的散射库 np<f, b. 散射模型命名 rd XCWK$E c. 改变散射模型为“Tabulated BSDF”. @<hF.4,] 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 ) kJHr&=VO~ 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。 ,lrYl!, 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, ,Y`'myL8W g. 点击OK 3 %z 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 FgXu1- Mi;}.K0J /p[|DJoM 脚本代码: 3?!G- NYWG#4D '#Language "WWB-COM" 6"BtfQ") D=jSh Option Explicit N!tpzHXw L4MxU 2 Sub Main p>2|| |^YzFrc 'Cleanup qzuQq94k ClearOutputWindow() *54>iO-
c F% F
c+? Print "Merging RPC Photonics BSDF Data Files" ~5lKL5w SetTextColor(255,0,0) Yh}zt
H Print "Note: Script should be located in the same folder as the BSDF TXT files." vF5wA-3&t Print "Note: Do not run this script multiple times without deleting the output file between executions." `4q5CJ2 SetTextColor(0,0,0) kWzuz# ap Fs UsE 'Current directory of this script (should be the same as the text files being merged) yw;ghP; Dim cDir As String '"!z$i~G= cDir = MacroDir$ & "\" "6NFe!/Y$* utYnaeQcn 'Array which will be populated with the list of files to be merged 4^d+l.F Dim fList() As String, curFile As String 1x~%Ydy GetFileList( cDir, fList ) b:N^Fe xi
'72 Print "" l.__10{ Print "Files found for merging:" !!?+M @ For Each curFile In fList .`oJcJ Print Chr(9) & curFile 'Qm` A= Next T0@](g /e-ka{WS 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 8>C;
>v Dim nameArray() As String, sampName As String />dB%* nameArray = Split(fList(0)," 0-0.txt") kx"hWG4 sampName = nameArray(0) l 'AK Print "" MgJ%26TZ Print "Sample name: " & Chr(9) & sampName y3
({(URU ?aK'OIo 'Open an output file and write the FRED header data =]_d pE EQ Dim outFile As String 6vD]@AF outFile = cDir & sampName & "_FRED.txt" k| _$R? Open outFile For Output As #1 Wrf^O2 Print #1, "type bsdf_data" Tf&f`/ Print #1, "format angles=deg bsdf=value scale=1" 5}.,"Fbr p9FA_(`^ 'Loop the file list, skip the two header lines and write the remaining data to file ^ l]]qdNr Dim lineArray() As String, curLine As Long -XS+Uv For Each curFile In fList SR&(HH$ Print "Merging data from file " & curFile _H~pH7WU ReadFile( cDir & curFile, lineArray ) @{J!6YGh For curLine = 2 To UBound(lineArray) Hrd5p+j Print #1, lineArray(curLine) d-6sC@PB Next C ?GvTc Next B)j`}7O06 [?|l X$< 'Close the output file tJ?qcT? Close #1 2 pM ?V&Ld$db Print "Finished merging RPC data for sample " & sampName p6&LZ=tL3 Print "FRED formatted data file: " & Chr(9) & outFile o1 hdO End Sub i#pjv'C p=8M0k 'Utility function to read the contents of a file into an array of strings. jQ.>2-;H9 Function ReadFile(ByVal fileName As String, _ )1ZJ ByRef lineArray() As String) As Long 5t"bCzp &X#x9|=&O ReadFile = -1 ;Zx K3/(7 Dim oFSO As Object (c|$+B^* Set oFSO = CreateObject("Scripting.FileSystemObject") ({d,oU$>y Erase lineArray }$&T
O$LX fd!pM4"0 Dim fid As Long `@fhge If oFSO.fileexists( fileName ) Then bl:a&<F fid = FreeFile() |g7nh[ Open fileName For Input As fid 'mBLf&fB lineArray = Split(Input(LOF(fid), fid), vbCrLf) M(.uu`B Close fid N27K End If E>l#0Zw Set oFSO = Nothing ~_dBND? Return UBound( lineArray ) Q>SPV8s <eud#v End Function :|3"H&FWK M\Uc;:) H Sub GetFileList( ByVal in_dir As String, _ }2iKi(io* ByRef in_flist() As String ) >0g`U PK.h E{R 'Redimension the file list array {L-{Y<fke Erase in_flist }6uV]V{ 323yAF 'Tracks how many files are found ]Vf8mkDGO Dim fCount As Long tK s4}vW fCount = 0 fJF8/IQ4 @mQ/WYs 'Recurse directory and search for text files wa(Wit"- Dim f As String {jx#^n&5R f = Dir$(in_dir & "*.txt") cdek^/ While f <> "" VuO) ReDim Preserve in_flist(fCount) (04j4teE in_flist(fCount) = f Kd`l[56# fCount += 1 ~u?x{[ f = Dir$() :uT
fhr Wend DMK"Q#Vw ReDim Preserve in_flist(fCount-1) %~B)~|h XDrlJvrPL End Sub Yn[EI7D `F-Dd4B |$.sB|_
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