[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： 2ag8?#  
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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。 Q3&q%n|<  
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背景： {$yju_[  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 *0eU_*A^zO  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 dpNER
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步骤 SZHgXl3:  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 X~JP 1  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） * zyik[o  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 |ll
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例如下所示： 3Ioe#*5\  
Sample name:  EDF-C1-56 Q-gVg%'7  
Merging data from file EDF-C1-56 0-0.txt %%uE^nX>  
Finished merging RPC data for sample EDF-C1-56 zp1ym}9M  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Uza '%R  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 JDE_*xaUV  
a. 创建一个新的散射库 KbvMp1'9P  
b. 散射模型命名 @CL#B98jl  
c. 改变散射模型为“Tabulated BSDF”. g]2L[4  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） z
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e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 g;8 wP5i  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， %60 OS3  
g. 点击OK ^sLx3a  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 oYStf5  
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脚本代码： o1$u;}^|  
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'#Language "WWB-COM" <c p
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Option Explicit cpltTJFg  
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Sub Main Q,xL8i M,  
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    'Cleanup Kx]SiejJ  
    ClearOutputWindow() }:ZA)  
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    Print "Merging RPC Photonics BSDF Data Files" eNAxVF0  
    SetTextColor(255,0,0) UGhEaKH~R  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 67& hXIp  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 0^-1d2Z~  
    SetTextColor(0,0,0) uD&B{c+a  
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    'Current directory of this script (should be the same as the text files being merged) x^f)I|t  
    Dim cDir As String ;X,u 
  
    cDir = MacroDir$ & "\" "lL+Heq>V  
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    'Array which will be populated with the list of files to be merged :/;/mHG]  
    Dim fList() As String, curFile As String kk3^m1  
    GetFileList( cDir, fList ) .9qK88fUR  
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    Print "" WVy'f|3;  
    Print "Files found for merging:" GlAI~\A  
    For Each curFile In fList neDXzMxF  
        Print Chr(9) & curFile c0@8KW[,  
    Next F3qK6Ah.  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. <=q} Nd\  
    Dim nameArray() As String, sampName As String A IP~A]T  
    nameArray = Split(fList(0)," 0-0.txt") Wp=3heCa6  
    sampName  = nameArray(0) do}LaUz  
    Print "" *x"80UXL  
    Print "Sample name: " & Chr(9) & sampName I0)`tQ+  
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    'Open an output file and write the FRED header data |7s2xRc  
    Dim outFile As String zH8E,)  
    outFile = cDir & sampName & "_FRED.txt" 4>hHUz[_  
    Open outFile For Output As #1 'pdTV:]zA  
    Print #1, "type bsdf_data" _!\d?]Ya  
    Print #1, "format angles=deg bsdf=value scale=1" /U~|B
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    'Loop the file list, skip the two header lines and write the remaining data to file +&Ld`d!n  
    Dim lineArray() As String, curLine As Long G6sK3K  
    For Each curFile In fList 7F
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        Print "Merging data from file " & curFile 1o_
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        ReadFile( cDir & curFile, lineArray ) 6o3 bq|  
        For curLine = 2 To UBound(lineArray) P3$eomX'  
            Print #1, lineArray(curLine) [VCC+_  
        Next ^QB[;g.O  
    Next |?`5~f  
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    'Close the output file *sho/[~_  
    Close #1 %`vzQt`>  
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    Print "Finished merging RPC data for sample " & sampName 7io["zW  
    Print "FRED formatted data file: " & Chr(9) & outFile kX 1}/l  
End Sub \U~4b_a
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'Utility function to read the contents of a file into an array of strings. L+%"ew  
Function ReadFile(ByVal fileName As String, _ #x%'U}sF  
                  ByRef lineArray() As String) As Long Q M,
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    ReadFile = -1 CUA @CZ6{  
    Dim oFSO As Object 7p&jSOY  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ^?69|,  
    Erase lineArray s:`i~hjq  
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    Dim fid As Long o<2GtF1"o  
    If oFSO.fileexists( fileName ) Then q!c(~UVw  
        fid = FreeFile() bm588UQ  
        Open fileName For Input As fid N!A20Bv  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) *pl6 V|  
        Close fid R{hX--|j  
    End If 3KLUH=)P  
    Set oFSO = Nothing ><%585  
    Return UBound( lineArray ) C \ Cc[v  
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End Function I8F+Z  
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Sub GetFileList( ByVal in_dir As String, _ -"(*'hD  
                 ByRef in_flist() As String ) g14
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    'Redimension the file list array \lL[08G  
    Erase in_flist T&U}}iWN  
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    'Tracks how many files are found U~ {k_'-i  
    Dim fCount As Long 6K2e]r  
    fCount = 0 $QX$rN  
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    'Recurse directory and search for text files 0SpB2>_  
    Dim f As String A`c22Ls]  
    f = Dir$(in_dir & "*.txt")
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    While f <> "" P\7DA4]  
        ReDim Preserve in_flist(fCount) <H[w0Z$  
        in_flist(fCount) = f $Dg-;I  
        fCount += 1 C*`WMP*  
        f = Dir$() v|?@k^Ms  
    Wend zal]t$z>  
    ReDim Preserve in_flist(fCount-1) c '|*{%<e2  
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End Sub z%&FLdXgW+  
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