[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： *T/']t  
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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。 khe}*y  
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背景： =euni}7a  
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。 nKY6[|!#  
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。 =  [E  
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步骤 *pq\MiD/  
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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。 fVlB=8DNk&  
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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） s_Sk0}e  
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 icgfB-1|i  
例如下所示： uFE)17E  
Sample name:  EDF-C1-56 n S=W1zf  
Merging data from file EDF-C1-56 0-0.txt \D4:Nt#  
Finished merging RPC data for sample EDF-C1-56 Hka2  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt mt .sucT  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 s AkdMo  
a. 创建一个新的散射库 g#bRT*,L  
b. 散射模型命名 iTwm3V P  
c. 改变散射模型为“Tabulated BSDF”. Y4-t7UlS;  
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 ） Y]>t[Lo%  
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。 _)8s'MjA:&  
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， ;uJMG  
g. 点击OK R_C)  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 OXA7w.^  
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脚本代码： N7"W{"3D  
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'#Language "WWB-COM" ]M=&+c>H~  
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Option Explicit 7#XzrT]  
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Sub Main <E~'.p,  
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    'Cleanup 4s-!7  
    ClearOutputWindow() la!~\wpa  
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    Print "Merging RPC Photonics BSDF Data Files" @JMiO^  
    SetTextColor(255,0,0) FrS]|=LJhX  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ?,mmYW6TjB  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." o-5TC  
    SetTextColor(0,0,0) [,Gg^*umS  
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    'Current directory of this script (should be the same as the text files being merged) Y2AJ+ |  
    Dim cDir As String [0!(xp^  
    cDir = MacroDir$ & "\" %b$>qW\*&  
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    'Array which will be populated with the list of files to be merged B#A6v0Ta  
    Dim fList() As String, curFile As String |Cv!,]9:r  
    GetFileList( cDir, fList ) @d'j zs  
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    Print "" 7Q 3k7  
    Print "Files found for merging:" ?,z}%p  
    For Each curFile In fList oH@78D0A  
        Print Chr(9) & curFile -?\D\\+t  
    Next :#Wd~~d  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. G|Ti4_w  
    Dim nameArray() As String, sampName As String z{ dEC %  
    nameArray = Split(fList(0)," 0-0.txt") MgZ/(X E  
    sampName  = nameArray(0) 1MFbQs^  
    Print "" }BEB1Q}L  
    Print "Sample name: " & Chr(9) & sampName _a, s )  
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    'Open an output file and write the FRED header data e\rp)[>'  
    Dim outFile As String #!=tDc &  
    outFile = cDir & sampName & "_FRED.txt" wYea\^co  
    Open outFile For Output As #1 W/N7vAx X  
    Print #1, "type bsdf_data" mH(:?_KrS-  
    Print #1, "format angles=deg bsdf=value scale=1" $4\j]RE!  
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    'Loop the file list, skip the two header lines and write the remaining data to file ?ub35NLa  
    Dim lineArray() As String, curLine As Long WJi]t93  
    For Each curFile In fList >P(.:_^p  
        Print "Merging data from file " & curFile HS$r8`S?)  
        ReadFile( cDir & curFile, lineArray ) C!gZN9-  
        For curLine = 2 To UBound(lineArray) kJU2C=m@e2  
            Print #1, lineArray(curLine) %#+Hl0,Tt  
        Next +`4A$#$+y  
    Next sOY:e/_F  
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    'Close the output file 9r9NxKuAO  
    Close #1 (
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    Print "Finished merging RPC data for sample " & sampName ceA9){  
    Print "FRED formatted data file: " & Chr(9) & outFile SbZ6t$"  
End Sub y_,bu^+*  
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'Utility function to read the contents of a file into an array of strings. +ZYn? #IQ  
Function ReadFile(ByVal fileName As String, _ ]e3Ax(i)  
                  ByRef lineArray() As String) As Long "@kaHIf[  
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    ReadFile = -1 |Tw~@kT@  
    Dim oFSO As Object jPeYmv]
  
    Set oFSO = CreateObject("Scripting.FileSystemObject") x-c"%Z|  
    Erase lineArray :UdF  
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    Dim fid As Long ~&O%N  
    If oFSO.fileexists( fileName ) Then rqq1TRg  
        fid = FreeFile() CTK;dM'uQ  
        Open fileName For Input As fid k)u[0}  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) sLFl!jX  
        Close fid Ac6=(B  
    End If & kIFcd@  
    Set oFSO = Nothing #$vEGY}1  
    Return UBound( lineArray ) Rcv9mj]l  
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End Function rNM;ZPF#  
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Sub GetFileList( ByVal in_dir As String, _ QJNFA}*>  
                 ByRef in_flist() As String ) B!yr!DW
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    'Redimension the file list array ;<5q]/IHK  
    Erase in_flist q4q6c")zp  
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    'Tracks how many files are found NI5``BwpO  
    Dim fCount As Long $( )>g>%  
    fCount = 0
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    'Recurse directory and search for text files 5x
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    Dim f As String Q\)F;:|  
    f = Dir$(in_dir & "*.txt") 2:R+tn(F  
    While f <> "" .pq%?&  
        ReDim Preserve in_flist(fCount) U.TA^S]`g  
        in_flist(fCount) = f Jwp7gYZ  
        fCount += 1 pp2~Meg  
        f = Dir$() tgaO!{9I?  
    Wend Q&&@v4L  
    ReDim Preserve in_flist(fCount-1) WHI`/FM  
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End Sub z2c6T.1M