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摘要: f'_M0x eO[c l B 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。 u|OtKq !.-.#<<_a 背景: c{4R*|^ 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。 B6%&gXr\ 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。 ]7vf#1i< 图1. RPC Photonics工程漫射体结构及光束投射形状 J*K<FFp3< |7c`(. u5F}( +4r 步骤 ?wCs&tM eM }W6vIn 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。 =<.F3lo\s $3#%aA!(# 图2. RPC Photonics工程漫射体不同类型的散射数据 3I*uV!notJ 2、 将 http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) &O*ENpF 3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 eEP(
). 例如下所示: l{Er+)a Sample name: EDF-C1-56 p:tN642 Merging data from file EDF-C1-56 0-0.txt ox4W$YdMG Finished merging RPC data for sample EDF-C1-56 }NwN2xTB FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt Z
Xb}R^O- 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 HsH<m j a. 创建一个新的散射库 R@n5AN( b. 散射模型命名 lwJip IO c. 改变散射模型为“Tabulated BSDF”. ;"@ :}_t 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 ) 2kJ!E@n7 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。 (}"S)#C 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, 4swKjN
& g. 点击OK W>$BF[x!{ 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 s OQcx\dK RH~sbnZ)F o(Kcs-W2 脚本代码: H+`*Y<F@ u`6/I#q` '#Language "WWB-COM" G"> 0]LQ SUu >6'LN Option Explicit *l-`<. [#Fg\2bq_y Sub Main i~8DSshA X:{WZs"[x 'Cleanup 74]a/'4 ClearOutputWindow() N&x:K+Zm. Pi){ h~B> Print "Merging RPC Photonics BSDF Data Files" ?K<ZkYw? SetTextColor(255,0,0) BSDk9Oc Print "Note: Script should be located in the same folder as the BSDF TXT files." 5~[N/Gl Print "Note: Do not run this script multiple times without deleting the output file between executions." :H\&2/j SetTextColor(0,0,0) qHJ'1~?q V{GXc:= 'Current directory of this script (should be the same as the text files being merged) [-58Ezyr Dim cDir As String `:4MMr9 1 cDir = MacroDir$ & "\" +5-fk>o Ut_mrb+W 'Array which will be populated with the list of files to be merged 6(.H3bu Dim fList() As String, curFile As String }{mG/(LX8 GetFileList( cDir, fList ) 7}o6_i !qw4mN Print "" !7c'<[+Hm Print "Files found for merging:" {XHk6w
*- For Each curFile In fList N8 M'0i? Print Chr(9) & curFile u<kD} Next `M)E* G Y}/c
N\ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. H
pFb{ Dim nameArray() As String, sampName As String Y%h}U<y nameArray = Split(fList(0)," 0-0.txt") ]>vf 9] sampName = nameArray(0) <`+zvUx^? Print "" J[r^T&o Print "Sample name: " & Chr(9) & sampName ?`aTu:1#Z ((cb4IX 'Open an output file and write the FRED header data T`Ro)ORC# Dim outFile As String }9=2g`2Q outFile = cDir & sampName & "_FRED.txt" _uJVuCc Open outFile For Output As #1 4,zvFH*AH Print #1, "type bsdf_data" ]738Z/)^ Print #1, "format angles=deg bsdf=value scale=1" 3SFg# P\T| [%E' 'Loop the file list, skip the two header lines and write the remaining data to file x ;mJvfX Dim lineArray() As String, curLine As Long Y'JL (~| For Each curFile In fList `*d{PJTv Print "Merging data from file " & curFile RM#fX^)= ReadFile( cDir & curFile, lineArray ) ]?#
#))RUS For curLine = 2 To UBound(lineArray) JT#7yetk' Print #1, lineArray(curLine) J&_3VKrN Next mmcdtVe Next h"8QeX:(( e{JVXc[D 'Close the output file bKByU{t Close #1 K
plM['uF RF!'K
ko Print "Finished merging RPC data for sample " & sampName |K)p]i+ Print "FRED formatted data file: " & Chr(9) & outFile u?Z
<n: End Sub FW5}oD(H .?Auh2nr 'Utility function to read the contents of a file into an array of strings. \=Nm5: Function ReadFile(ByVal fileName As String, _ [,GU5,o ByRef lineArray() As String) As Long 6W:1>,xS Ju4.@ ReadFile = -1 w49{-Pp[ Dim oFSO As Object qPUA!-' Set oFSO = CreateObject("Scripting.FileSystemObject") kXMP=j8 Erase lineArray lZvS0JS Wz5=(<{S Dim fid As Long (FG^UA#' If oFSO.fileexists( fileName ) Then ]<q'U> N fid = FreeFile() mZE8.` Open fileName For Input As fid vS#{-X lineArray = Split(Input(LOF(fid), fid), vbCrLf) '{CWanTPi Close fid :~i+tD End If M=6G:HHY Set oFSO = Nothing fzyzuS$ Return UBound( lineArray ) ]\`w1'* EP(Eq End Function F0&O/-w&u *k4+ioFnKE Sub GetFileList( ByVal in_dir As String, _ 5v+L';wx[T ByRef in_flist() As String ) 6: GN(R$0 ~hzEKvs 'Redimension the file list array wcl!S { Erase in_flist h&P
{p _Y X+%u(>> 'Tracks how many files are found ivD^HhG Dim fCount As Long EzUPah fCount = 0 A-;^~I U&s(1~e\ 'Recurse directory and search for text files H<XlUCr_~+ Dim f As String 8lpzSJP4k f = Dir$(in_dir & "*.txt") Z7oaQ\fR While f <> "" &<@%{h@= ReDim Preserve in_flist(fCount) ^^eV4Y5`+ in_flist(fCount) = f u
X>PefR fCount += 1 UC(9Dz f = Dir$() ,uO?;!t Wend YMK>+y[+4 ReDim Preserve in_flist(fCount-1) 38"cbHE3 ,.h$&QFj; End Sub {RH*8?7 'cYQ?; Nv{eE<<6 QQ:2987619807 4[Z1r~t\L
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