[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： S7(tGD  
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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。 '.*`PN5mDq  
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背景： WSqo\]  
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。 @+yjt'B  
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。 `%_(_%K  
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步骤 l,ic-Y1  
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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。 -cgMf\YF  
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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） G]T&{3g-.  
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 G;AJBs>Y}  
例如下所示： O|0V mm  
Sample name:  EDF-C1-56 1pM>-"a8j  
Merging data from file EDF-C1-56 0-0.txt ZVDi;   
Finished merging RPC data for sample EDF-C1-56 Ww =ksggpB  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt VJS1{n=;k  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 IgEVz^W?h  
a. 创建一个新的散射库 'o|=_0-7W  
b. 散射模型命名 o3Z<tI8-V  
c. 改变散射模型为“Tabulated BSDF”. E=]$nE]b  
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 ） C ett*jm_  
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。 KqvM5$3  
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， UV\&9>@L  
g. 点击OK !SThK8j$7  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 XGAR8=tic  
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脚本代码： y4,t=Gq7^  
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'#Language "WWB-COM" $KPf[JvQ  
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Option Explicit &IP`j~b  
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Sub Main G$t:#2  
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    'Cleanup Qn \=P*j  
    ClearOutputWindow() &/$3>MD2`  
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    Print "Merging RPC Photonics BSDF Data Files" @6VkNe9  
    SetTextColor(255,0,0) H(DI /"N  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." H={5>;8G  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." N3ccn  
    SetTextColor(0,0,0) {4r }jH  
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    'Current directory of this script (should be the same as the text files being merged) (t"e#b(:  
    Dim cDir As String *R8P brN  
    cDir = MacroDir$ & "\" K<p
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    'Array which will be populated with the list of files to be merged y-_IMu.J`  
    Dim fList() As String, curFile As String ;
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    GetFileList( cDir, fList ) %Vhj<
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    Print "" */j[n$K>~`  
    Print "Files found for merging:" A>rN.XW  
    For Each curFile In fList QxiAC>%K  
        Print Chr(9) & curFile ,yTT,)@<  
    Next 9n;6;K#  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Bs\&'=l  
    Dim nameArray() As String, sampName As String m 3Do+!M[  
    nameArray = Split(fList(0)," 0-0.txt") \;0UP+  
    sampName  = nameArray(0) C,,S<=L:  
    Print "" 8[x{]l[  
    Print "Sample name: " & Chr(9) & sampName 89ab?H}/  
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    'Open an output file and write the FRED header data vgN%vw pL  
    Dim outFile As String 'e8O \FOf  
    outFile = cDir & sampName & "_FRED.txt" 90">l^HX=  
    Open outFile For Output As #1 s$xm  
    Print #1, "type bsdf_data" ?{r-z3@ N  
    Print #1, "format angles=deg bsdf=value scale=1" Nx<fj=VJ  
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    'Loop the file list, skip the two header lines and write the remaining data to file ADB,gap  
    Dim lineArray() As String, curLine As Long Ha~}NO  
    For Each curFile In fList )b-KF}]d  
        Print "Merging data from file " & curFile T_oL/x_;  
        ReadFile( cDir & curFile, lineArray ) ( \7Yo^  
        For curLine = 2 To UBound(lineArray) M8|kmF
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            Print #1, lineArray(curLine) a[RqK#  
        Next "BvDLe':  
    Next h-5] nL3  
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    'Close the output file GhW{6.^  
    Close #1 `FAZAC\  
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    Print "Finished merging RPC data for sample " & sampName gCM(h[7A  
    Print "FRED formatted data file: " & Chr(9) & outFile f&? 8fB8{  
End Sub 7%i6zP/a  
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'Utility function to read the contents of a file into an array of strings. ,ZvlKN  
Function ReadFile(ByVal fileName As String, _ Zi.
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                  ByRef lineArray() As String) As Long GoPK. E$  
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    ReadFile = -1 CFG(4IMx  
    Dim oFSO As Object {#&j
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    Set oFSO = CreateObject("Scripting.FileSystemObject") I1W~;2cK  
    Erase lineArray r-5xo.J'  
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    Dim fid As Long 3jw4#GW  
    If oFSO.fileexists( fileName ) Then ]%[.>mR  
        fid = FreeFile() `,Y/!(:;  
        Open fileName For Input As fid 1V;,ZGI*  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 1_z~<d @?;  
        Close fid #XeabcOQ  
    End If 2Y%E.){  
    Set oFSO = Nothing Hf9F:yH  
    Return UBound( lineArray ) z}2  
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End Function qIk(ei  
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Sub GetFileList( ByVal in_dir As String, _ p~dj-w  
                 ByRef in_flist() As String ) $rH}2  
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    'Redimension the file list array HQV#8G#B  
    Erase in_flist W"1=K]B  
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    'Tracks how many files are found c)zwyBz  
    Dim fCount As Long pGsu#`t  
    fCount = 0 }Pj;9ivz  
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    'Recurse directory and search for text files 6<9gVh<=w  
    Dim f As String C^ Oy.s  
    f = Dir$(in_dir & "*.txt") R9InUX"k  
    While f <> "" 5Pd^Sew  
        ReDim Preserve in_flist(fCount) lNB<_SO  
        in_flist(fCount) = f AmBLZ<f;  
        fCount += 1 W4:#=.m  
        f = Dir$() w'<"5F`  
    Wend -qJO6OM  
    ReDim Preserve in_flist(fCount-1) {Zf 9} !qF  
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End Sub |\SwZTr  
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