RPC Photonics扩散片BSDF
摘要: jPx}-_jM H5UF r,t 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。 08%Bx~88_% "*MF=VB1 背景: gMPp'^g]_ 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。 `YMd0* 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。 a <F2]H=J
图1. RPC Photonics工程漫射体结构及光束投射形状 $
O[Y /?z3*x WlGT&m&2 步骤 pW>{7pXn :l iDoGDi 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。 JB.U& =2} kiLKO
图2. RPC Photonics工程漫射体不同类型的散射数据 %p&y/^=0I 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) H5:f&m 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 P46Q3EE
例如下所示: rQ U6*f Sample name: EDF-C1-56 qn |~YXn Merging data from file EDF-C1-56 0-0.txt AR$SQ_4 Finished merging RPC data for sample EDF-C1-56 "QiLu=Rq FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 'lu3BQvfh 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 O(D2F$VlL a. 创建一个新的散射库 r}D#(G$ b. 散射模型命名 6Q_A-X3hk c. 改变散射模型为“Tabulated BSDF”. apfr>L3 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 ) iy]?j$B$ 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。 @_#\qGY 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, rcY &n^: g. 点击OK ,j.bdlI# 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 VRD^> Gi 8~TKiR5 |')PQ 脚本代码: M:iH7K X:g#&e_ '#Language "WWB-COM" zZ<* (hQi { Option Explicit 4udj"-V uhp.Yv@c Sub Main ;/JXn 0 ]L
'Cleanup \^RKb-6n ClearOutputWindow() v=cQ`nou ZKpJc'h Print "Merging RPC Photonics BSDF Data Files" ;YW@ 3F-h SetTextColor(255,0,0) \4C[<Gbx$( Print "Note: Script should be located in the same folder as the BSDF TXT files." n+YUG Print "Note: Do not run this script multiple times without deleting the output file between executions." fBv:
TC% SetTextColor(0,0,0) RgQs`aI 2+~gZxHq 'Current directory of this script (should be the same as the text files being merged) ;DR5?N/a Dim cDir As String }<l:~-y| cDir = MacroDir$ & "\" >TBXT+ m]8*k=v 'Array which will be populated with the list of files to be merged A~<!@`NjB Dim fList() As String, curFile As String ms&1P GetFileList( cDir, fList ) } e+`Kxy 0BhcXHt Print "" A8Fe@$<#8 Print "Files found for merging:" m|c[C\)By For Each curFile In fList HG?+b Print Chr(9) & curFile NlKVl~_ C Next {B4qeG5 "`4ky] 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. 3Ke6lV)uq Dim nameArray() As String, sampName As String 1PUZB`"3 nameArray = Split(fList(0)," 0-0.txt") F@f4-NR> sampName = nameArray(0) :/$WeAg Print "" W0~G`A(:; Print "Sample name: " & Chr(9) & sampName Y7r;}^+WY NjOUe?BQ 'Open an output file and write the FRED header data ~~-VScG& Dim outFile As String 2%`=
LGQC outFile = cDir & sampName & "_FRED.txt" /(51\RYkir Open outFile For Output As #1 ?Y,^Moc: Print #1, "type bsdf_data" w]{c*4o Print #1, "format angles=deg bsdf=value scale=1" S_Wq`I@b Q[rZ1z 'Loop the file list, skip the two header lines and write the remaining data to file $6pLsX Dim lineArray() As String, curLine As Long >$L7J=Em For Each curFile In fList rVoV@,P Print "Merging data from file " & curFile Hxgc9Fis ReadFile( cDir & curFile, lineArray ) It&CM,=t For curLine = 2 To UBound(lineArray) z06,$OYz Print #1, lineArray(curLine) \WE&5
9G Next B\)Te9k' Next 3c3;8h$k "IT7.!=@9 'Close the output file nv@z;#& Close #1 ,S=[# !uW*~u Print "Finished merging RPC data for sample " & sampName _r{H)}9 Print "FRED formatted data file: " & Chr(9) & outFile il@>b End Sub J*$%d1 rVNx2 'Utility function to read the contents of a file into an array of strings. "j,vlG Function ReadFile(ByVal fileName As String, _ [=q/f2_1. ByRef lineArray() As String) As Long n2B%}LLa P{6$".kIY ReadFile = -1 PD0&ep1h7G Dim oFSO As Object A%W]XEa<
Set oFSO = CreateObject("Scripting.FileSystemObject") U\?D;ABQ% Erase lineArray ra T9 yT@Aj;X0v Dim fid As Long &3Zb? If oFSO.fileexists( fileName ) Then 9Sxr9FLW~ fid = FreeFile() :) lG}c
Open fileName For Input As fid %0C [v7\ lineArray = Split(Input(LOF(fid), fid), vbCrLf) $5JeN{B Close fid i3N{Dt End If <lf692.3 Set oFSO = Nothing O?Bf (y Return UBound( lineArray ) Bc"MOSV0 F8?2+w@P End Function Mu[lk=jC M8X6!"B$Y Sub GetFileList( ByVal in_dir As String, _ .b3h?R*& ByRef in_flist() As String ) [q2:d^_FA `5?0yXK 'Redimension the file list array H@1'El\9 Erase in_flist qS/}aDk& iF^qbh%%E 'Tracks how many files are found /f1]U
LmC: Dim fCount As Long
|gO7`F2 fCount = 0 N<:c*X rzAf {2 'Recurse directory and search for text files ?uSoJM`wa! Dim f As String 1 Q(KZI f = Dir$(in_dir & "*.txt") HqW / While f <> "" agx8 *x ReDim Preserve in_flist(fCount) FE!jN-# in_flist(fCount) = f f%o[eW# fCount += 1 *pwkv7Zh f = Dir$() D#&9zR86F Wend HXKM<E{j ReDim Preserve in_flist(fCount-1) {k3ItGQ_ mBErU6?X,A End Sub i#*[,
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