[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： Vsr"W@k_  
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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。 sQ.t3a3m  
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背景： hP}-yW6]  
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。 ~r_2V$sC2  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 kD(#LM<9s  
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步骤 *7w!~mn[m  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 KL./  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） +8Y|kC{9"  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 .03Rp5+v  
例如下所示： &?}A/(#  
Sample name:  EDF-C1-56 5O;D\M{>  
Merging data from file EDF-C1-56 0-0.txt my0
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Finished merging RPC data for sample EDF-C1-56 Xzl$Qc  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt a"`>J!  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ](FFvqA  
a. 创建一个新的散射库 #r/5!*3  
b. 散射模型命名 axOEL:-|Bu  
c. 改变散射模型为“Tabulated BSDF”. Ckc5;:b&m  
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 ） [^W +^3V  
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。 H%>^_:h  
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， O`5hjq#  
g. 点击OK eV~"T2!Sb  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 >.I9S{7  
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脚本代码： zI\+]U'  
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'#Language "WWB-COM" mZG n:f}=  
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Option Explicit 10)RLh|+  
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Sub Main GS7'pTsYH  
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    'Cleanup \C
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    ClearOutputWindow() r-*j"1 e  
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    Print "Merging RPC Photonics BSDF Data Files" x6^Y&,y9kU  
    SetTextColor(255,0,0) e)N<r  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." MiR$N  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." wWSo+40  
    SetTextColor(0,0,0) mkhWbzD'S  
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    'Current directory of this script (should be the same as the text files being merged) hC9EL= A  
    Dim cDir As String CO9PQ`9+  
    cDir = MacroDir$ & "\" R1/c@HQw?  
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    'Array which will be populated with the list of files to be merged d3Y;BxEz  
    Dim fList() As String, curFile As String gVe]?Jva`  
    GetFileList( cDir, fList ) }+Q4s]  
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    Print "" (z8;J>7  
    Print "Files found for merging:" JU.!<  
    For Each curFile In fList ^d@2Y0h
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        Print Chr(9) & curFile !v(^wqna\  
    Next dwQ1~  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. KVh#"]<WV  
    Dim nameArray() As String, sampName As String 9X,iQ  
    nameArray = Split(fList(0)," 0-0.txt") 1uppE|  
    sampName  = nameArray(0) `6lOqH  
    Print "" ;^u,[d  
    Print "Sample name: " & Chr(9) & sampName /.=aA~|  
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    'Open an output file and write the FRED header data k14<E/  
    Dim outFile As String .6LRg  
    outFile = cDir & sampName & "_FRED.txt" tC(MaI  
    Open outFile For Output As #1 N{~P}Sw  
    Print #1, "type bsdf_data" Qc)i?Z'6  
    Print #1, "format angles=deg bsdf=value scale=1" DA04llX~  
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    'Loop the file list, skip the two header lines and write the remaining data to file M@P%k`6C  
    Dim lineArray() As String, curLine As Long %l14K_  
    For Each curFile In fList #oFyi @U  
        Print "Merging data from file " & curFile ,Q3OQ[Nmh  
        ReadFile( cDir & curFile, lineArray ) 97$Q?a8S@  
        For curLine = 2 To UBound(lineArray) 8|<</v8i  
            Print #1, lineArray(curLine) w-2#CX8jY  
        Next Kh[l};/F  
    Next _)~1'tCs}h  
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    'Close the output file l2:-).7xt  
    Close #1 U#]J5'i  
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    Print "Finished merging RPC data for sample " & sampName [7d(PEQL`  
    Print "FRED formatted data file: " & Chr(9) & outFile %8h=_(X\7  
End Sub 6wj o:I  
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'Utility function to read the contents of a file into an array of strings. \Vroz=IT:  
Function ReadFile(ByVal fileName As String, _ }( CYok  
                  ByRef lineArray() As String) As Long &P>& T  
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    ReadFile = -1 |59)6/i  
    Dim oFSO As Object %OB>FY:|  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ZI;*X~h  
    Erase lineArray od5nRb  
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    Dim fid As Long s]OZ+^Z  
    If oFSO.fileexists( fileName ) Then fP5i
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        fid = FreeFile() r5ldK?=k+*  
        Open fileName For Input As fid %8|lAMTY7/  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) t&EizH$  
        Close fid {:*G/*1[.  
    End If /*{'p!?  
    Set oFSO = Nothing `B4Ilh"d  
    Return UBound( lineArray ) yn$1n
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End Function w8R7Ksn(  
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Sub GetFileList( ByVal in_dir As String, _ iQ(j_i'+!I  
                 ByRef in_flist() As String ) cu foP&  
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    'Redimension the file list array k ,ldi  
    Erase in_flist y0(.6HI  
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    'Tracks how many files are found f=}T^Z<  
    Dim fCount As Long |h6!bt!=  
    fCount = 0 `h'l"3l  
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    'Recurse directory and search for text files 3<+ZA-2  
    Dim f As String @s cn ?t  
    f = Dir$(in_dir & "*.txt") 7gN;9pc$  
    While f <> "" ][tR=Y#&y5  
        ReDim Preserve in_flist(fCount) _AX,}9
 
        in_flist(fCount) = f -dO8Uis$  
        fCount += 1 Uq_lT,  
        f = Dir$() %(p9AE  
    Wend "{qnm+G  
    ReDim Preserve in_flist(fCount-1) ~cSXBc,+  
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End Sub B }euIQB  
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