[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： [tA;l+Q\&  

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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。 J@X'PG< 6B  
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背景： )5U[o0td  
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。 .dQQoyR+O  
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。 K7Wk6Aw  
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步骤 ?Poq2
 
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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。 sWblFvHqrU  
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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） )Ocl=H|=  
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 16i"Yg!*  
例如下所示： mAW,?h  
Sample name:  EDF-C1-56 *9c!^$V  
Merging data from file EDF-C1-56 0-0.txt }HYjA4o\A  
Finished merging RPC data for sample EDF-C1-56 %v7[[U{T  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt tl'9IGlc  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 /E5 5Pec  
a. 创建一个新的散射库 qt^T6+faaQ  
b. 散射模型命名 | j a-
 
c. 改变散射模型为“Tabulated BSDF”. 'ao"9-c  
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 ） cEd+MCN  
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。 w MP  
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， Bk\Gj`"7  
g. 点击OK mzc 4/<th  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 k{$ ao  
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脚本代码： ]t
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'#Language "WWB-COM" UNi`P9D]3  
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Option Explicit gzD@cx?V  
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Sub Main Cssl{B  
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    'Cleanup pOkLb #  
    ClearOutputWindow() R$Tp8G>j  
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    Print "Merging RPC Photonics BSDF Data Files" Iu*^xn  
    SetTextColor(255,0,0) MqA`yvQm  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." [wB9s{CX  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." gxMfu?zk"  
    SetTextColor(0,0,0) dk<XzO~g  
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    'Current directory of this script (should be the same as the text files being merged) \VFHHi:I  
    Dim cDir As String i^!ez5z  
    cDir = MacroDir$ & "\" <ExZ:ip  
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    'Array which will be populated with the list of files to be merged %F*|;o7
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    Dim fList() As String, curFile As String 1#4PG'H  
    GetFileList( cDir, fList ) {Pu\?Cq  
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    Print "" r]Ff{la5  
    Print "Files found for merging:" =}:)y0L  
    For Each curFile In fList FsGlJ  
        Print Chr(9) & curFile EmT`YNuc  
    Next y{a$y}7#X  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. (x$9~;<S*d  
    Dim nameArray() As String, sampName As String iIGbHn,/  
    nameArray = Split(fList(0)," 0-0.txt") v^7LctcVm  
    sampName  = nameArray(0) e~T@~(fft  
    Print "" s{4\xAS>  
    Print "Sample name: " & Chr(9) & sampName &h,5:u  
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    'Open an output file and write the FRED header data LR,7,DH$9'  
    Dim outFile As String EIf~dOgH  
    outFile = cDir & sampName & "_FRED.txt" hwDbs[:  
    Open outFile For Output As #1 N9rBW
 
    Print #1, "type bsdf_data" @&hnL9D8lL  
    Print #1, "format angles=deg bsdf=value scale=1" ]k8/#@19  
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    'Loop the file list, skip the two header lines and write the remaining data to file }Y17*zp%  
    Dim lineArray() As String, curLine As Long TV}}dw  
    For Each curFile In fList 35*\_9/#  
        Print "Merging data from file " & curFile 'snYu!`z  
        ReadFile( cDir & curFile, lineArray ) uGl| pJ\y=  
        For curLine = 2 To UBound(lineArray) ,[nm_^R*\  
            Print #1, lineArray(curLine) STA4 p6  
        Next qJ_1*!!91  
    Next ro[Y-o5Q0  
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    'Close the output file g+C!kaC)  
    Close #1 OW(&s,|6x  
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    Print "Finished merging RPC data for sample " & sampName i$KpDXP\  
    Print "FRED formatted data file: " & Chr(9) & outFile sF+=KH  
End Sub da$BUAqU  
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'Utility function to read the contents of a file into an array of strings. oAZh~~tp  
Function ReadFile(ByVal fileName As String, _ ?oiKVL"7  
                  ByRef lineArray() As String) As Long i NWC6y  
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    ReadFile = -1 )hj|{h7  
    Dim oFSO As Object |k{-l!HI  
    Set oFSO = CreateObject("Scripting.FileSystemObject") vY*\R0/a  
    Erase lineArray p
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    Dim fid As Long xqHL+W  
    If oFSO.fileexists( fileName ) Then :'r6TVDW  
        fid = FreeFile() !1uzX
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        Open fileName For Input As fid (a6?s{(  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) b]]N{: I  
        Close fid NgB 7?]vu  
    End If WIh@y2&R  
    Set oFSO = Nothing `$z)$VuP  
    Return UBound( lineArray ) i`OrMzL  
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End Function (w2= 2$  
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Sub GetFileList( ByVal in_dir As String, _ (5uJZ!m  
                 ByRef in_flist() As String ) 3An(jt$%Q  
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    'Redimension the file list array ?4)v`*  
    Erase in_flist 1ZKzumF  
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    'Tracks how many files are found /axTh  
    Dim fCount As Long 1=Ilej1  
    fCount = 0 3,.% s  
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    'Recurse directory and search for text files I*1S/o_xI  
    Dim f As String ".2A9]
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    f = Dir$(in_dir & "*.txt") LI:T
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    While f <> "" 
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        ReDim Preserve in_flist(fCount) f(u&XuZ  
        in_flist(fCount) = f En9R>A;`  
        fCount += 1 -rDz~M
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        f = Dir$() $ehg@WK}.  
    Wend "'eWn6O(  
    ReDim Preserve in_flist(fCount-1) r7)@M%A  
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End Sub sS,#0Qt.  
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