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摘要: O?8^I< @)8QxI^3[ 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。 }LH>0v_<Y JD^&d~n_ 背景: G\\zk 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。 8t$a8 PE FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 E6SGK,f0D 图1. RPC Photonics工程漫射体结构及光束投射形状 sW~Z?PFP Ge+&C RhyX B)F2SK<@ 步骤 w#Y<~W& }2.^n{Y
1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 27-<q5q
H}NW? 图2. RPC Photonics工程漫射体不同类型的散射数据 Mj&f7IUO 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) /;M0tP 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 *'+OA6 例如下所示: '|0Dt|$ Sample name: EDF-C1-56 "`DCXn#mB Merging data from file EDF-C1-56 0-0.txt q/,W'lQ\; Finished merging RPC data for sample EDF-C1-56 "
}@QL` FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt (lhbH]I 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 pa&*n=&cL a. 创建一个新的散射库 &0O1tM*v b. 散射模型命名 G?)vqmJ% c. 改变散射模型为“Tabulated BSDF”. R/
7G 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 )
;p"G<n 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。 $;%-<*Co f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, E+$vIYq:W g. 点击OK 4A%O`&eZ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 J{=by]-rD, 3LZ0EYVL fbSl$jn. 脚本代码: U S+PI` 93%U;0w[Nw '#Language "WWB-COM" NYD#I{h )<
~1AL Option Explicit >9D=PnHnD *1V}vJvi Sub Main 0@E[IDmp I<*U^e 'Cleanup M'D;2qo ClearOutputWindow() 9)sGnD; &yzC\XdA Print "Merging RPC Photonics BSDF Data Files" ARW|wXhyf SetTextColor(255,0,0) $kJvPwRO Print "Note: Script should be located in the same folder as the BSDF TXT files." "A^9WhUpJ Print "Note: Do not run this script multiple times without deleting the output file between executions." U]dz_%CRP SetTextColor(0,0,0) mq~7v1kw WO*YBH@ 'Current directory of this script (should be the same as the text files being merged) \LRno3 Dim cDir As String p"/1Kwqx cDir = MacroDir$ & "\" ;$(a+? 3|RfX 'Array which will be populated with the list of files to be merged :{C#<g` Dim fList() As String, curFile As String ):eX* GetFileList( cDir, fList ) FsZF>vaV DY?`Y%" Print "" w-[WJ:2. Print "Files found for merging:" ?gjM]Ki%: For Each curFile In fList Wx~0_P Print Chr(9) & curFile w:Fes Next {m F:m5e a3
wUB 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 5xP\6Nx6&5 Dim nameArray() As String, sampName As String z>NRvx0 nameArray = Split(fList(0)," 0-0.txt") GAbX.9[V sampName = nameArray(0) Os9xZ Print "" zl46E~"]x Print "Sample name: " & Chr(9) & sampName [g/Hf(& V@<tIui$ 'Open an output file and write the FRED header data 5)o-$1s A Dim outFile As String t/HMJ outFile = cDir & sampName & "_FRED.txt" D0=D8P}H: Open outFile For Output As #1 A\lnH5A Print #1, "type bsdf_data" +Tde#T&[ Print #1, "format angles=deg bsdf=value scale=1" L.lmbxn ;PI=jp 'Loop the file list, skip the two header lines and write the remaining data to file |h(!CFR Dim lineArray() As String, curLine As Long #ldNWwvRGj For Each curFile In fList w``t"v4 Print "Merging data from file " & curFile Zse3e ReadFile( cDir & curFile, lineArray ) Bm"jf] For curLine = 2 To UBound(lineArray) 'Wl))lB Print #1, lineArray(curLine) ( }5k"9Z Next Ua\g*Cxh Next 3Z NYR' c*K-?n9YMz 'Close the output file ,ju 1:` Close #1 7*d}6\
%
md_aD Print "Finished merging RPC data for sample " & sampName cysYjuI i Print "FRED formatted data file: " & Chr(9) & outFile s#?Y^bgH End Sub wqyx{W`~w %FLz}QW* 'Utility function to read the contents of a file into an array of strings. J6_Hlt Function ReadFile(ByVal fileName As String, _ >Be PE(k ByRef lineArray() As String) As Long a*6x^R;) Fe%Q8RIh_ ReadFile = -1 *-T3'beg Dim oFSO As Object BgJ;\NV Set oFSO = CreateObject("Scripting.FileSystemObject") N \[Cuh8Fe Erase lineArray $}2m%$vJO AF ZHS\ Dim fid As Long ]pl g@ If oFSO.fileexists( fileName ) Then -4Zf0r1u fid = FreeFile() ]IXKoJUf Open fileName For Input As fid m*|3 lineArray = Split(Input(LOF(fid), fid), vbCrLf) GKH7Xx( Close fid 'CjcOI
s End If tn+i5Eso Set oFSO = Nothing .@JXV
$Z Return UBound( lineArray ) E {4/$} 5G'X\iR End Function ,'m<um lLxKC7b Sub GetFileList( ByVal in_dir As String, _ ZGSb&!Ke ByRef in_flist() As String ) i>_V?OT#5 fOm=#:O 'Redimension the file list array EN` --^ Erase in_flist -OZXl &!2
4l=! 'Tracks how many files are found
;B o 2$ Dim fCount As Long Hwklk9U fCount = 0 Q?L-6]pg Ui@Q&%b 'Recurse directory and search for text files ;VeC(^-eh6 Dim f As String |L.QIr,jCC f = Dir$(in_dir & "*.txt") *I(>[m! While f <> "" @sav8] ReDim Preserve in_flist(fCount) {jcrTjmxe in_flist(fCount) = f UMpC2)5 fCount += 1 ~A}"s-Kq5 f = Dir$() %L:e~* Wend eEb(TG~,Y ReDim Preserve in_flist(fCount-1) #n]js7 tmDI2Z%7 End Sub M['8zN 29z+<?K{ =<y$5"| QQ:2987619807 qS*qHT(u19
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