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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。 51&K TKBW2 背景: hiQ #< 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。 3"HW{= 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。 U+FI^Xrt# 图1. RPC Photonics工程漫射体结构及光束投射形状
70BLd(? n3Q Rn^ nA?Ks!9T 步骤 nWz7$O
$]t3pAI[H0 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。 "|KhqV=?v /\0g)B;] 图2. RPC Photonics工程漫射体不同类型的散射数据
7`_`V&3s 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) Z_.xglq{ 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 dFVx*{6 例如下所示: f5ttQ&@FF Sample name: EDF-C1-56 8.m9 =+)8 Merging data from file EDF-C1-56 0-0.txt $WS?/H0C Finished merging RPC data for sample EDF-C1-56 y1c2(K>tu FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt l1I\khS 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 [;RO= a. 创建一个新的散射库 O=E?m=FR" b. 散射模型命名 Hru~Y}V c. 改变散射模型为“Tabulated BSDF”. VY|'7in"M d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ZD;1{ e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 ly~tB LH} f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, )j/b`V6 g. 点击OK D(&XmC[\Y 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 NA;OT7X[ u]uZc~T +Cg[!6[# 脚本代码: V+Y; I92orr1 '#Language "WWB-COM" h51)kN: VSLi{=# Option Explicit PyQ
P K, W|-<ekH_u Sub Main 1 ` ={** M>_
U9g 'Cleanup e` {F7rd: ClearOutputWindow() -4!S?rHwd+ /|#" ;QsPN Print "Merging RPC Photonics BSDF Data Files" '"M9`@Y3^ SetTextColor(255,0,0) KzWqHq Print "Note: Script should be located in the same folder as the BSDF TXT files." cl1>S 3 Print "Note: Do not run this script multiple times without deleting the output file between executions." 'D &[Y)f^ SetTextColor(0,0,0) .6HHUy K$kI%eGZA 'Current directory of this script (should be the same as the text files being merged) X(M|T]`b: Dim cDir As String s)9d\{ cDir = MacroDir$ & "\" >\4"k4d} we}G%09L 'Array which will be populated with the list of files to be merged -a\[`JHi Dim fList() As String, curFile As String %k i^XB86 GetFileList( cDir, fList ) _?rL7oTv
SodYb Print "" ]gjB%R[.m Print "Files found for merging:" 8'|_O For Each curFile In fList '9XSz? Print Chr(9) & curFile b;jr;I Next Zt/4|&w 2`P=ekF] 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. i)=dp!Bx^ Dim nameArray() As String, sampName As String BBDt^$ nameArray = Split(fList(0)," 0-0.txt") C7Ny-rj}IA sampName = nameArray(0) R?5v//[ Print "" 1WUlBr/k Print "Sample name: " & Chr(9) & sampName hmp!|Q[) x.kIzI5 'Open an output file and write the FRED header data %Fp1c K Dim outFile As String wrm
ReT? outFile = cDir & sampName & "_FRED.txt" "(+p1
Open outFile For Output As #1
`BzjDI:a Print #1, "type bsdf_data" \$W\[s4I Print #1, "format angles=deg bsdf=value scale=1" 05s{Z.aK Q/]t$ 'Loop the file list, skip the two header lines and write the remaining data to file ~ya@ YP]'; Dim lineArray() As String, curLine As Long ')zf8>, For Each curFile In fList bvF-F$n%F Print "Merging data from file " & curFile sg%Ptp ReadFile( cDir & curFile, lineArray ) t~_bquGk For curLine = 2 To UBound(lineArray) w42=tN+B Print #1, lineArray(curLine) IutU~%wv Next s_#6^_ Next =O??W8u 'dJ(x 'Close the output file *o6hDhg Close #1 LOi/+;> @FaK/lKK Print "Finished merging RPC data for sample " & sampName }s@vN8C Print "FRED formatted data file: " & Chr(9) & outFile [m0G;%KR/ End Sub P-?R\(QYtR <~}NxY\5 'Utility function to read the contents of a file into an array of strings. (-%1z_@Y Function ReadFile(ByVal fileName As String, _ OJT%?P%@{ ByRef lineArray() As String) As Long K9QC$b9( t{Wu5<F: ReadFile = -1 75W@B}dZd Dim oFSO As Object LO@o`JF Set oFSO = CreateObject("Scripting.FileSystemObject") j]'ybpMT" Erase lineArray '7JM/AcC#K A@ZsL Dim fid As Long >)6k)$x%% If oFSO.fileexists( fileName ) Then 9}$'q$0R] fid = FreeFile() :wY(</H Open fileName For Input As fid wo5fGQJ lineArray = Split(Input(LOF(fid), fid), vbCrLf) e)f!2'LL Close fid bBY7^k End If SQ-CdpT< Set oFSO = Nothing G'{*guYU Return UBound( lineArray ) CPci
'SO !0X/^Xv@= End Function cCv@fks -Ra-Ux Sub GetFileList( ByVal in_dir As String, _ @cB6,iUr ByRef in_flist() As String ) ]N{jF$ eOZ"kw"uHu 'Redimension the file list array -+fW/Uo Erase in_flist 4uE|$ O"9Or3w 'Tracks how many files are found z-JYzxL9 Dim fCount As Long ;4k/h/o1# fCount = 0 hxkwT #L+ZHs~ 'Recurse directory and search for text files K$c?:?wmo Dim f As String ?X@uR5?{ f = Dir$(in_dir & "*.txt") mbXW$E-&R2 While f <> "" '}9 %12\^h ReDim Preserve in_flist(fCount) `{H!V~42 in_flist(fCount) = f nG~^-c+ fCount += 1 e4<St`K f = Dir$() d@ef+- Wend K>_~|ZN1C8 ReDim Preserve in_flist(fCount-1) Le2rc*T FJ2~SKWT End Sub Zp+orc7 ZVDi;
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