[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： J}+N\V~
 

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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。 Rkp +}@Y_  
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背景： dA E85  
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。 w\UAKN60  
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。 *4LRdLMn  
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步骤 cui%r!D  
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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。 (C1~>7L  
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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） PkZ1Db  
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 c~ vql4  
例如下所示： $Ff6nc=  
Sample name:  EDF-C1-56 y\(xYB>T  
Merging data from file EDF-C1-56 0-0.txt _~{J."q  
Finished merging RPC data for sample EDF-C1-56 SIKaDIZ  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Z!Z{Gm3  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 aMxj{*v7  
a. 创建一个新的散射库 m/jyc# L:u  
b. 散射模型命名 m#G,m  
c. 改变散射模型为“Tabulated BSDF”. G<k.d"<  
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 ） Mk=*2=d  
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。 [s\8@5?E  
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， 63_#*6Pv28  
g. 点击OK E2t&@t%W  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 |(TEG.<g  
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脚本代码： @o*~\E<T  
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'#Language "WWB-COM" +5I'? _{V  
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Option Explicit 6d6Dk>(V  
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Sub Main =R 4]Kf  
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    'Cleanup kP/<S<h,g  
    ClearOutputWindow() n@R/zy  
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    Print "Merging RPC Photonics BSDF Data Files" bA2[=6  
    SetTextColor(255,0,0) {dP6fr1z  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." ZR%$f-  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 2TQZu3$c  
    SetTextColor(0,0,0) iPY)Ew`Im  
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    'Current directory of this script (should be the same as the text files being merged) v@ qDR|?^  
    Dim cDir As String {QmK4(k?|c  
    cDir = MacroDir$ & "\" nUVk;0at  

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    'Array which will be populated with the list of files to be merged &OE-+z  
    Dim fList() As String, curFile As String m\CU,9;;(  
    GetFileList( cDir, fList ) ,quUGS  
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    Print "" %Ie,J5g5  
    Print "Files found for merging:" R >SZE"  
    For Each curFile In fList s]`6uyW"  
        Print Chr(9) & curFile kka{u[ruA  
    Next qmGHuQVe  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ~;pP@DA  
    Dim nameArray() As String, sampName As String i92Z`jiR  
    nameArray = Split(fList(0)," 0-0.txt") ,3eN&  
    sampName  = nameArray(0) WlY\R>x#  
    Print "" v$x)$/]n  
    Print "Sample name: " & Chr(9) & sampName | 2<zYY  
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    'Open an output file and write the FRED header data J}4RJ9  
    Dim outFile As String >Di`zw~  
    outFile = cDir & sampName & "_FRED.txt" !>!jLZ0  
    Open outFile For Output As #1 `1Md1e:J  
    Print #1, "type bsdf_data" }?Pa(0=U  
    Print #1, "format angles=deg bsdf=value scale=1" )+hJi/g  
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    'Loop the file list, skip the two header lines and write the remaining data to file >Wx9a"H^(  
    Dim lineArray() As String, curLine As Long uh#E^~5S  
    For Each curFile In fList <
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        Print "Merging data from file " & curFile p`Tl)[*  
        ReadFile( cDir & curFile, lineArray ) nygeR|:\  
        For curLine = 2 To UBound(lineArray) )k[XO  
            Print #1, lineArray(curLine) U8HuqFC  
        Next P,F5Hf  
    Next !B{(EL=g  
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    'Close the output file `:m=r
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    Close #1 q3-cWfU  
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    Print "Finished merging RPC data for sample " & sampName -`Zk`s|
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    Print "FRED formatted data file: " & Chr(9) & outFile k%-UW%  
End Sub 3BLHd<  
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'Utility function to read the contents of a file into an array of strings. GMLx$?=j  
Function ReadFile(ByVal fileName As String, _ qX6zk0I a
 
                  ByRef lineArray() As String) As Long :x3DuQP  
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    ReadFile = -1 $Op:-aW&  
    Dim oFSO As Object -cZuP7oA  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 7~P!Z=m^^f  
    Erase lineArray [!} uj`e  
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    Dim fid As Long {\VsM#K6  
    If oFSO.fileexists( fileName ) Then #L*MMC"  
        fid = FreeFile() :'fK`G 6  
        Open fileName For Input As fid _x`:Ne?  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 4IM&#_6  
        Close fid :,/ \E  
    End If sv "GX<+  
    Set oFSO = Nothing *l0i}"T^_  
    Return UBound( lineArray ) )^)|b5,  
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End Function ~+RrL,t#  
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Sub GetFileList( ByVal in_dir As String, _ %F;uW[4r  
                 ByRef in_flist() As String ) eR3MU]zF  
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    'Redimension the file list array `sRys oW  
    Erase in_flist OQyZ'  
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    'Tracks how many files are found #X5Tt  ;  
    Dim fCount As Long ,p..h+l  
    fCount = 0 Dl}va  
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    'Recurse directory and search for text files 
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    Dim f As String  |FFMQ"  
    f = Dir$(in_dir & "*.txt") V0F1X s`  
    While f <> "" 1py>[II@  
        ReDim Preserve in_flist(fCount) !#WJ(zSq  
        in_flist(fCount) = f 4%TmW/yd  
        fCount += 1 PC!X<C8*  
        f = Dir$() Ftu
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    Wend '}P$hP_d  
    ReDim Preserve in_flist(fCount-1) )L,Nh~  
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End Sub |X~vsM0