RPC Photonics扩散片BSDF
摘要: %k4Qx5`?d #<[&Lw 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。 =QVkY7 d*{Cv2A. 背景: %r1#G.2YW 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。 W
!j-/ql 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。 QG?!XWz
图1. RPC Photonics工程漫射体结构及光束投射形状 &Iy5@8 m0;j1-t /xJD/"Y3& 步骤 #[9UCX^= fB9,#
F 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。 6k;5T @Nsn0-B?ne
图2. RPC Photonics工程漫射体不同类型的散射数据 YSGE@ 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) jw{N#QDh 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 QD!NV* 例如下所示: M}[Q2v\ Sample name: EDF-C1-56 }nPt[77U_7 Merging data from file EDF-C1-56 0-0.txt \u`P(fI!K% Finished merging RPC data for sample EDF-C1-56 xwZ1Q,'C FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt lgiKNZgB? 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 PI%l a. 创建一个新的散射库 2o<*rH b. 散射模型命名 JR]elRR c. 改变散射模型为“Tabulated BSDF”. Jkj7ty.J 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 ) I1>f2/$z* e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 N}U+K f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, `Z,WKus g. 点击OK m
uO. 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 HcIJ&".~ wicsf<] c\o_U9=n 脚本代码: Yf9E0po Wo&22,EB '#Language "WWB-COM" 1(Vv-bq$ xwsl$Rj Option Explicit gBV4IQ @Ik5BT Sub Main wT!?.Y)aj a({Rb?b 'Cleanup &_Cc ClearOutputWindow() ,YM=?No gWU#NRRc Print "Merging RPC Photonics BSDF Data Files" 0(+<uo~6p1 SetTextColor(255,0,0) yWRIh*>nE Print "Note: Script should be located in the same folder as the BSDF TXT files." 'L O3[G{ Print "Note: Do not run this script multiple times without deleting the output file between executions." =Ks&m4 SetTextColor(0,0,0) Ux',ma1JK $rj:K)P 'Current directory of this script (should be the same as the text files being merged) .?NfV%vv Dim cDir As String }\<=B%{
cDir = MacroDir$ & "\" )2y [#Blo 6
DQOar>d 'Array which will be populated with the list of files to be merged $,Xn@4 Dim fList() As String, curFile As String *bpN!2 GetFileList( cDir, fList ) qfT9g>EF -<x% Print "" [p'2#Et Print "Files found for merging:" XixjdBFP For Each curFile In fList 90+Vw`Gz= Print Chr(9) & curFile ]~
N. Next Hz,Gn9:p [K
#$W 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. yj_/:eX Dim nameArray() As String, sampName As String ]vcT2lr] nameArray = Split(fList(0)," 0-0.txt") aO1.9!<v sampName = nameArray(0) 7<70\6 Print "" c(Y~5A{TXO Print "Sample name: " & Chr(9) & sampName )OQm,5F1 ][Tw^r& 'Open an output file and write the FRED header data _s#J\!F Dim outFile As String ]E"J^mflGK outFile = cDir & sampName & "_FRED.txt" $G0e1)D Open outFile For Output As #1 %6fnL~A Print #1, "type bsdf_data" Yqh-U%"' Print #1, "format angles=deg bsdf=value scale=1" FP{=b/ ]+ub
R; 'Loop the file list, skip the two header lines and write the remaining data to file Q3+%8zZI Dim lineArray() As String, curLine As Long .mrv"k\< For Each curFile In fList tpzWi
W/ Print "Merging data from file " & curFile )2E vZn ReadFile( cDir & curFile, lineArray ) %Jl6e}! For curLine = 2 To UBound(lineArray) p?Ux1S Print #1, lineArray(curLine) ]+pE1-p\ Next =4x6v< Next ecl6>PS$' m-C#~Cp36 'Close the output file "(H%m9K Close #1 lu>G=uCJ G@D8[ Print "Finished merging RPC data for sample " & sampName |;V-;e* Print "FRED formatted data file: " & Chr(9) & outFile Qe7
SH{ End Sub H^B,b!5i JeVbFZ8 'Utility function to read the contents of a file into an array of strings. U;ujN 8 Function ReadFile(ByVal fileName As String, _ `K$;K8! 1 ByRef lineArray() As String) As Long 'Q7t5v@FF WzdlrkD ReadFile = -1 ., thdqOO Dim oFSO As Object rmX5-k Set oFSO = CreateObject("Scripting.FileSystemObject") g-x;a0MQx Erase lineArray +=L+35M 3M^`6W[; Dim fid As Long RAEN
&M If oFSO.fileexists( fileName ) Then qncZpXw^ fid = FreeFile() }]=A:*jD Open fileName For Input As fid [;toumv lineArray = Split(Input(LOF(fid), fid), vbCrLf) SzG
%%CXH_ Close fid X2~KNw End If i7\>uni Set oFSO = Nothing +K=RM qM-8 Return UBound( lineArray ) "$"<AKCwS LBpAR| End Function RHu,t5, w3>G3=b Sub GetFileList( ByVal in_dir As String, _ YSZ[~?+ ByRef in_flist() As String ) x1CMW`F JO87rG 'Redimension the file list array H0Sm4 Erase in_flist rhQO#_` =/xXB 'Tracks how many files are found ZkMHy1 Dim fCount As Long OWN|W, fCount = 0 -42 U O1]XoUH< 'Recurse directory and search for text files t!ZFpMv]n Dim f As String zlh\P` f = Dir$(in_dir & "*.txt") 7vH4}S\
q While f <> "" w6B`_Z'f ReDim Preserve in_flist(fCount) wz:w6q in_flist(fCount) = f b DF_ fCount += 1 wp/x|AV f = Dir$() b\t@vMJ Wend +hWeN&A ReDim Preserve in_flist(fCount-1) i)ibDrX!I r^\Wo7q End Sub lFgE{;z@
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