[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： ,FO|'l  
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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。 gC 4#!P  
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背景： C"WZsF^3  
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。 ~5529  
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。 [i_x 1  
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步骤 mYX) =
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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。 (5 hu W7v  
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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>Hx#R<*%  
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 @su,w,xLS  
例如下所示： TXv#/@  
Sample name:  EDF-C1-56 Bw[VK7  
Merging data from file EDF-C1-56 0-0.txt +=4b5*+qG  
Finished merging RPC data for sample EDF-C1-56 3.Kdz}  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt RPwSo.c4
 
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 {lJpcS  
a. 创建一个新的散射库 zZ-*/THB@R  
b. 散射模型命名 $la,_Sr  
c. 改变散射模型为“Tabulated BSDF”. cB^lSmu5  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） ^`THV  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 uyIA]OtyN  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， *fZ'#C~x  
g. 点击OK jL&F7itP  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 Pipif.  
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脚本代码： ?*=Jq  
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'#Language "WWB-COM" Vv]mME@  
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Option Explicit Re_.<_$  
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Sub Main A\>qoR!
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    'Cleanup E:AXnnGKO  
    ClearOutputWindow() X@rAe37h+  
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    Print "Merging RPC Photonics BSDF Data Files" KC'{>rt7  
    SetTextColor(255,0,0) gC_U7aw  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." q=U=Y n  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." #%~wuCn<K  
    SetTextColor(0,0,0) , {^g}d8  
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    'Current directory of this script (should be the same as the text files being merged) Wp $\>  
    Dim cDir As String W;7cF8fu4  
    cDir = MacroDir$ & "\" GmFNL/x8-v  
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    'Array which will be populated with the list of files to be merged E@p9vf->  
    Dim fList() As String, curFile As String <pCZ+Yv E"  
    GetFileList( cDir, fList ) TD<.:ul]  
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    Print "" I~,*Rgv/Z  
    Print "Files found for merging:" (Q&Z/Fe  
    For Each curFile In fList V0>,Kxk  
        Print Chr(9) & curFile 4?`7XJ0a  
    Next q-'zZ#  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 'a}pWkLB  
    Dim nameArray() As String, sampName As String :v#3;('7  
    nameArray = Split(fList(0)," 0-0.txt") -4.+
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    sampName  = nameArray(0) $P$OWp?b  
    Print "" t5S S]  
    Print "Sample name: " & Chr(9) & sampName 6v-h!1p{u  
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    'Open an output file and write the FRED header data 09r.0Ks  
    Dim outFile As String nL
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    outFile = cDir & sampName & "_FRED.txt" +u7mw<A 8  
    Open outFile For Output As #1 &}<IR\ci  
    Print #1, "type bsdf_data" d4/ZOj+%  
    Print #1, "format angles=deg bsdf=value scale=1" z,vjY$t:/  
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    'Loop the file list, skip the two header lines and write the remaining data to file !"Kg b;A
 
    Dim lineArray() As String, curLine As Long &W1c#]q@r  
    For Each curFile In fList n,`&f~tap  
        Print "Merging data from file " & curFile @<_4Nb  
        ReadFile( cDir & curFile, lineArray ) W1 E((2  
        For curLine = 2 To UBound(lineArray) z' @F@k6  
            Print #1, lineArray(curLine) =73wngw  
        Next yA~W|q(/V  
    Next ZDlMk
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    'Close the output file "~tEmMz  
    Close #1 /p~gm\5Z  
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    Print "Finished merging RPC data for sample " & sampName P:=3;d{v  
    Print "FRED formatted data file: " & Chr(9) & outFile I%
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End Sub fU,sn5zZ  
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'Utility function to read the contents of a file into an array of strings. dLLF
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Function ReadFile(ByVal fileName As String, _ ds`a6>746  
                  ByRef lineArray() As String) As Long QM OOJA  
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    ReadFile = -1 w _n)*he)z  
    Dim oFSO As Object Wcbb3N$+  
    Set oFSO = CreateObject("Scripting.FileSystemObject") fn)c&|aCt  
    Erase lineArray m8.sHw  
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    Dim fid As Long {/N4/gu  
    If oFSO.fileexists( fileName ) Then bX8Bn0#a+  
        fid = FreeFile() Pn0V{SJOJ%  
        Open fileName For Input As fid ]*?qaIdqu  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) g9g^zd,  
        Close fid ,JX/`7y  
    End If in$Pk$ c  
    Set oFSO = Nothing sa{X.}i%E  
    Return UBound( lineArray ) ~!\n
 
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End Function KnKV+:"  
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Sub GetFileList( ByVal in_dir As String, _ r\Zz=~![<  
                 ByRef in_flist() As String ) s#>Bwn&b)  
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    'Redimension the file list array Z3)1!|#Q  
    Erase in_flist J"# o #~  
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    'Tracks how many files are found UT%^!@u  
    Dim fCount As Long qhc3 oRe  
    fCount = 0 lUbQ@7a<'  
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    'Recurse directory and search for text files SnRk` 5t  
    Dim f As String j'
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    f = Dir$(in_dir & "*.txt") %&0_0BU  
    While f <> "" g^/  
        ReDim Preserve in_flist(fCount) 1jO}{U  
        in_flist(fCount) = f P >HEV a  
        fCount += 1 <J!#k@LY]7  
        f = Dir$() L> > %  
    Wend ?*){%eE  
    ReDim Preserve in_flist(fCount-1) =y.?=`"  
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End Sub  `C9/=