RPC Photonics扩散片BSDF
摘要: )j]RFt 'Vd>"ti 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。 ,J~dER\% ?0x;L/d]) 背景: (hoqLL\}k 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。 tj3p71% 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。 =3'wHl
图1. RPC Photonics工程漫射体结构及光束投射形状 79v&6Io Sa0\93oa yT4|eHl 步骤 RjT[y: ! 2-4%h! 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。 ,x/j&S9! 0U<9=[~q7@
图2. RPC Photonics工程漫射体不同类型的散射数据 Q%a4g 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) #?9oA4Q 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 R~i<* 例如下所示: \3l;PY Sample name: EDF-C1-56 Vk"QcW Merging data from file EDF-C1-56 0-0.txt +vP1DXtj( Finished merging RPC data for sample EDF-C1-56 >\'yj|
U, FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt a'Z"Yz^Eo 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ]q j%6tz a. 创建一个新的散射库 MAXdgL[] b. 散射模型命名 4{Iz\:G:{/ c. 改变散射模型为“Tabulated BSDF”. }Y[.h=X 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 ) ;8@A7`^ 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。 Ii)TCSt9U? 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, VioVtP0
g. 点击OK i[<O@Rb 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ~LVa# 3eB2=_V` w*+rB p,f 脚本代码: {XVSHUtw 0V^?~ex '#Language "WWB-COM" 1#'wR3[+ g%Z;rDfi Option Explicit by
{~gu 6V)# Yf Sub Main T<OLfuV V{n pK( 'Cleanup dG| iA] ClearOutputWindow() G/y< bPQ &(K*TB|Om Print "Merging RPC Photonics BSDF Data Files" 0zd1:*KR, SetTextColor(255,0,0) 7(jt:V6V Print "Note: Script should be located in the same folder as the BSDF TXT files." cIgF]My*D@ Print "Note: Do not run this script multiple times without deleting the output file between executions." xZkLN5I{ SetTextColor(0,0,0) g$<@! ''Hq-Ng 'Current directory of this script (should be the same as the text files being merged) yCz?V[49 Dim cDir As String `);`E_'U
k cDir = MacroDir$ & "\"
I{E10; {DpZg",H- 'Array which will be populated with the list of files to be merged cv^^NgQ Dim fList() As String, curFile As String ]`MRH[{ GetFileList( cDir, fList ) M4QMD;Ez V3jx{BXs2 Print "" eC1cE Print "Files found for merging:" k,r\^1h For Each curFile In fList pd|c7D!6U, Print Chr(9) & curFile AVi|JY)> Next ZXco5,1 `Z{7Ut^) 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. `0sa94H1[ Dim nameArray() As String, sampName As String
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}- nameArray = Split(fList(0)," 0-0.txt") 5L4~7/kj sampName = nameArray(0) H}:apRb Print "" t+vn.X+& Print "Sample name: " & Chr(9) & sampName sl)_HA7G %3q@\:s 'Open an output file and write the FRED header data ~<|xS
Dim outFile As String HMBxj($eR outFile = cDir & sampName & "_FRED.txt" b2Ct^`|M5 Open outFile For Output As #1 c=ZX7U Print #1, "type bsdf_data" %DiZ&}^Ck Print #1, "format angles=deg bsdf=value scale=1" 8(BLS{-"< 1{DHlyA6g 'Loop the file list, skip the two header lines and write the remaining data to file vHao
y Dim lineArray() As String, curLine As Long vXyaOZ For Each curFile In fList t.]oLG22r Print "Merging data from file " & curFile H*l8,*M} ReadFile( cDir & curFile, lineArray ) dL v\H& For curLine = 2 To UBound(lineArray) &359tG0@P Print #1, lineArray(curLine) cP(/+
/9 Next u{I)C0 Next Ij#?r2Z% s7=]!7QGS! 'Close the output file 27;*6/>, Close #1 *F&C`] 5HmX-+XpK Print "Finished merging RPC data for sample " & sampName Lx2.E1?@ Print "FRED formatted data file: " & Chr(9) & outFile Nn%{Ka End Sub nE,"3X" kRG-~'f%` 'Utility function to read the contents of a file into an array of strings. p7|~x@q+ Function ReadFile(ByVal fileName As String, _ _pW\F(+8 ByRef lineArray() As String) As Long C#(4>' m\j'7mZ1 ReadFile = -1 2TY|)ltsF Dim oFSO As Object xez~Yw2 Set oFSO = CreateObject("Scripting.FileSystemObject") {V8v
Erase lineArray c^I_~OwaE Uw4KdC Dim fid As Long *YYm;J' If oFSO.fileexists( fileName ) Then KUZ'$oKg fid = FreeFile() ]{Iy< Open fileName For Input As fid f5^[`b3H lineArray = Split(Input(LOF(fid), fid), vbCrLf) l3-;z)SgH Close fid FjVC&+c End If Id|38 Set oFSO = Nothing rs'~' Y Return UBound( lineArray ) -bduB@#2d &`GQS| End Function or>5a9pj O0c#-K.f Sub GetFileList( ByVal in_dir As String, _ KE6[ u*\ ByRef in_flist() As String ) C%0 |o/Wi A)&OR]0[ 'Redimension the file list array cl30"WK! Erase in_flist [@_}BZk WTZP}p1 'Tracks how many files are found 80LKxA;5N Dim fCount As Long 0k0y'1SL fCount = 0 R"VmN2 Zm^4p{I%o* 'Recurse directory and search for text files
D`2Iy.|! Dim f As String %5NfF65' f = Dir$(in_dir & "*.txt") bncIxxe While f <> "" a3sXl+$D@ ReDim Preserve in_flist(fCount) d7qHUx'=z in_flist(fCount) = f Y }aa6 fCount += 1 <9B\(' f = Dir$() ZV$qv=X Wend sTU`@}} ReDim Preserve in_flist(fCount-1) *O+G}_} |ffM6W1: End Sub &ScADmZP^d +x\b- ' 8.ll]3)) QQ:2987619807 49E<`f0
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