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摘要: :&w{\-0{ Q0cRH"!: 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。 ga0'zo9K vkcRm`. 背景: \a|L/9% 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。 Ee2c5C!|C 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。 u8vuwbra! 图1. RPC Photonics工程漫射体结构及光束投射形状 z#Nl@NO&
p{Sh F. Hs(D/&6% 步骤 K_/B?h E4[}lX} 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。 csQfic LE=k 图2. RPC Photonics工程漫射体不同类型的散射数据 %[QV,fD'E 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) ;<wS+4, 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 #kmh:P 例如下所示: :k,Q,B.I Sample name: EDF-C1-56 Ru\_dr2yI} Merging data from file EDF-C1-56 0-0.txt (pR.Abq Finished merging RPC data for sample EDF-C1-56 [=%YV# O FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt =
+Xc4a 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 BavO\{J#|0 a. 创建一个新的散射库 Z)"61)
) b. 散射模型命名 =zg:aTMti c. 改变散射模型为“Tabulated BSDF”. E~hzh /,34 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 ) 0b|zk < 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。 fI|[Z+" 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, q/&y*)&'O g. 点击OK \fLvw 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Q<"[C
1Lj B]iP't\~ p@Q5b}xCG_ 脚本代码: G*}F5.>8( 1s7^uA$}6 '#Language "WWB-COM" IB5BO7J 9.+/~$Ht
Option Explicit ?.bnIwQe [`_io>*g Sub Main n(;:*<Rh
_^t-9 'Cleanup y2yKm1<Ru< ClearOutputWindow() H{G{H=K_ 3Rv7Qx Print "Merging RPC Photonics BSDF Data Files" lE#m]D SetTextColor(255,0,0) ,"?A2n-qO Print "Note: Script should be located in the same folder as the BSDF TXT files." JBX[bx52<r Print "Note: Do not run this script multiple times without deleting the output file between executions." A.%CAGU5w SetTextColor(0,0,0) vK'?:}~ 2j&@p> 'Current directory of this script (should be the same as the text files being merged) -8Ti*: Dim cDir As String +|RB0}hFS- cDir = MacroDir$ & "\" \NL+}cL/ 3smM,fi 'Array which will be populated with the list of files to be merged 9@VO+E$7L Dim fList() As String, curFile As String *,WP,-0 GetFileList( cDir, fList ) UVuDQ tbDoP
Y Print "" )9j06(<A Print "Files found for merging:" vA% ^`5 For Each curFile In fList Sfjje4R Print Chr(9) & curFile (M-ZQ
- Next (k"_># %
j2n,f7hl. 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. C? Zw6M+ Dim nameArray() As String, sampName As String ,TC;{ $O5 nameArray = Split(fList(0)," 0-0.txt") C;B}3g& sampName = nameArray(0) y&J@?Hc> Print "" \c`oy=qY0 Print "Sample name: " & Chr(9) & sampName <9A@`_';Aq wzWbB2Mb5 'Open an output file and write the FRED header data zsl,,gk9Y Dim outFile As String N=1JhjVk" outFile = cDir & sampName & "_FRED.txt" h5zVGr Open outFile For Output As #1 TCVl8)j Print #1, "type bsdf_data" [w\?j, Print #1, "format angles=deg bsdf=value scale=1" $ChK]v
6C C*6S@4k 'Loop the file list, skip the two header lines and write the remaining data to file _GtBP'iN Dim lineArray() As String, curLine As Long vwGeD|Fb5 For Each curFile In fList *wbZ;rfF Print "Merging data from file " & curFile A7XnHPIw ReadFile( cDir & curFile, lineArray ) (&\aA 0-}H For curLine = 2 To UBound(lineArray) \k8rxW Print #1, lineArray(curLine) &Vk; VM`5 Next ]gb= Next $ItF])Bj5N ub?K, 'Close the output file v Y|! Close #1 B/uniR^x rp34?/Nz Print "Finished merging RPC data for sample " & sampName kAzd8nJ' Print "FRED formatted data file: " & Chr(9) & outFile tx7~SUr End Sub 4/>Our 5 748CD{KxW 'Utility function to read the contents of a file into an array of strings. h rN% Function ReadFile(ByVal fileName As String, _ <&!]K?Q9i ByRef lineArray() As String) As Long ,K9f_bv _sHK*&W{CT ReadFile = -1 =v6*| Dim oFSO As Object (zo^Nn9VJ Set oFSO = CreateObject("Scripting.FileSystemObject") %i{;r35M;9 Erase lineArray [\ )Ge ekSY~z=/u Dim fid As Long wVK*P
-C If oFSO.fileexists( fileName ) Then eARk
QV fid = FreeFile() Bd0eC#UGkQ Open fileName For Input As fid S9sR# lineArray = Split(Input(LOF(fid), fid), vbCrLf) Bn wzcl Close fid obClBO)@Y End If 5t:8.%<UK Set oFSO = Nothing cSP*f0n,eo Return UBound( lineArray ) NY tl8O6`<Z End Function [G|mY6F^ ,lN5,zI=S Sub GetFileList( ByVal in_dir As String, _ CX/(o] ByRef in_flist() As String ) D@Da0 {i{xo2<1" 'Redimension the file list array G&{HTYP Erase in_flist \y
Hen|% 4)-)# `K 'Tracks how many files are found nn~YK Dim fCount As Long haSM=;uPM fCount = 0 [`fI:ao| h,t|V}Wb 'Recurse directory and search for text files $ACx*e% Dim f As String w; TkkDH f = Dir$(in_dir & "*.txt") 3 pWM~(#>- While f <> "" f|3q^wjs
ReDim Preserve in_flist(fCount) 5a`%)K in_flist(fCount) = f U5ZX78>a fCount += 1
a=}*mF[ug f = Dir$() [IX+M#mf Wend z5cYyx
r> ReDim Preserve in_flist(fCount-1) 7v~j=Z> ZXiRw)rM End Sub 3 x*z\VJ
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