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C 摘要: &_c5C G|]39/OO3{ 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。 ?jBh=X\]: ;6zp,t0 背景: 9_S>G$9D Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 .We"j_
} FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。图1. RPC Photonics工程漫射体结构及光束投射形状 *8QGv6*vQ .7GAGMNS (svd~h e2 MU&P+Wr 步骤 b<rJ@1qtJ _\xd]~ELj 1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 =G2A Ufn 图2. RPC Photonics工程漫射体不同类型的散射数据 "Q@ZS2;A ep"54o5=d 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) u>-!5=D8 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 bQM_rqjJGw 例如下所示: n\y%5J+ Sample name: EDF-C1-56 lN^} qg>< Merging data from file EDF-C1-56 0-0.txt [HhdeLOX Finished merging RPC data for sample EDF-C1-56 DPsf] FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt 6|:]2S 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 mI~k@ !3 a. 创建一个新的散射库 mM7S9^<UH b. 散射模型命名 ^Ru/7pw5 c. 改变散射模型为“Tabulated BSDF”. d6k`=Hlg d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Ea*Jl< e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 LA^H213N| f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, k/#& ]8( g. 点击OK 0zAj.iG 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 0TI+6u P1
`-OM 9f4#b8 脚本代码: =r:-CRq( 7L:$Amb_F '#Language "WWB-COM" ^*]0quu=z k iCg+@nT Option Explicit b1;80P/:D 29#;;n}p Sub Main v(t?d A%s"WSx, 'Cleanup r`L$[C5I ClearOutputWindow() i.Qy0 {
O*maE" Print "Merging RPC Photonics BSDF Data Files" c.PPVqx SetTextColor(255,0,0) ~WJEH# Print "Note: Script should be located in the same folder as the BSDF TXT files." vF=d`T< Print "Note: Do not run this script multiple times without deleting the output file between executions." ukr
a)>Y[| SetTextColor(0,0,0) J,E'F!{ bewi.$E{
'Current directory of this script (should be the same as the text files being merged) %o+VZEH3 Dim cDir As String *Gm%Dn cDir = MacroDir$ & "\" .Go 3'$'v GIDC' 'Array which will be populated with the list of files to be merged zKWcDbj Dim fList() As String, curFile As String W/uaNp GetFileList( cDir, fList ) %fpcH e}e\*BL Print "" j%KLp4J/e Print "Files found for merging:" ht S5<+Y For Each curFile In fList KwRO?G9& Print Chr(9) & curFile A|YqBl Next Nze#u; ,bCPO`45 'Split the first text file name found to get the sample name. First file should be 0-0 measurement.
M>~jLu0@ Dim nameArray() As String, sampName As String h"')D nameArray = Split(fList(0)," 0-0.txt") xgt dmv% sampName = nameArray(0) Tp`by
1s Print "" ^6ZA2-f/<8 Print "Sample name: " & Chr(9) & sampName %9=^#e+pE ~OEP)c\k 'Open an output file and write the FRED header data 81/Bn! Dim outFile As String ~'HwNzDQc outFile = cDir & sampName & "_FRED.txt" 0bpl3Fh.v Open outFile For Output As #1 (CH F=g Print #1, "type bsdf_data" gRKmfJ*u Print #1, "format angles=deg bsdf=value scale=1" >"S'R9t y2^r.6"O 'Loop the file list, skip the two header lines and write the remaining data to file Xt /muV Dim lineArray() As String, curLine As Long ])a?ri For Each curFile In fList xk}YeNVj Print "Merging data from file " & curFile fdzD6KZI ReadFile( cDir & curFile, lineArray ) ^c^9kK' For curLine = 2 To UBound(lineArray) "S^;X
@#v Print #1, lineArray(curLine) .) B _~tct Next s&M6DFlA Next A[!Fg0X0 VD.p"F(] 'Close the output file ~y^#?; Close #1 Sz"J-3b^ r 06}@ 7 Print "Finished merging RPC data for sample " & sampName w=3@IW Print "FRED formatted data file: " & Chr(9) & outFile h&5H`CR[ End Sub ^C@uP9g r+>E`GGQ 'Utility function to read the contents of a file into an array of strings. VD+8j29 Function ReadFile(ByVal fileName As String, _ SA{A E9y ByRef lineArray() As String) As Long 'e\m6~u\hm ~|pVz/s|G ReadFile = -1 2:/' Dim oFSO As Object M:nXn7)+ Set oFSO = CreateObject("Scripting.FileSystemObject") ZqkP# ]+Y' Erase lineArray rFn;z}J2 L;5jhVy Dim fid As Long C&3#'/& If oFSO.fileexists( fileName ) Then l@<^V N@ fid = FreeFile() @k,u xe- Open fileName For Input As fid r&xqsZ%R lineArray = Split(Input(LOF(fid), fid), vbCrLf) i3*?fMxhu) Close fid Lz=nJn End If =6j
5, Set oFSO = Nothing <i~ (
8F\ Return UBound( lineArray ) 7|T5N[3?l, d^Ra1@0"q2 End Function &m4
\"X@ hn.9j" Sub GetFileList( ByVal in_dir As String, _ naXo <B ByRef in_flist() As String ) v(=fV/ )Bl% {C 'Redimension the file list array zV4%F"- Erase in_flist 3>0/WbA:7E ?qw&H /R 'Tracks how many files are found /pFg<
Dim fCount As Long )wpBxJ;dB} fCount = 0 0[T!}F^%e ZHICpL 'Recurse directory and search for text files v.cB3/$z Dim f As String doP4N6 f = Dir$(in_dir & "*.txt") Rh9>iA@fd While f <> "" 0X0HDQ ReDim Preserve in_flist(fCount) WaN0$66[: in_flist(fCount) = f mv SNKS fCount += 1 Q2^}NQO= f = Dir$() T!pWU*aB Wend ~{Tus.jk ReDim Preserve in_flist(fCount-1) |