[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： 'U}i<^,c  
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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。 7\{<AM?*  
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背景： <;9vwSH>  
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。 t4s}w$4  
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。 RSmxwx^  
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步骤 >y]YF3?  
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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。 fXL>L   
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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） sOJ"~p  
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 d\Dxmb]o  
例如下所示： }3[ [ONA  
Sample name:  EDF-C1-56 v/yk T9@;  
Merging data from file EDF-C1-56 0-0.txt ^Gs!"Y  
Finished merging RPC data for sample EDF-C1-56 Za}91z"  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt QX(:!b  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 NmtBn^t  
a. 创建一个新的散射库 ?6j@EJ<2q  
b. 散射模型命名 >{GC@Cw  
c. 改变散射模型为“Tabulated BSDF”. u4+VG5.rhT  
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=)}=^N0  
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。 9,,v0tE  
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， >656if O  
g. 点击OK U}Hmzb  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 #lVVSrF,-  
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脚本代码： 54}s:[O  
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'#Language "WWB-COM" f4w|  
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Option Explicit J::SFu=  
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Sub Main i!,>3  
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    'Cleanup +Tu:zCv.  
    ClearOutputWindow()  ;\iQZ~   
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    Print "Merging RPC Photonics BSDF Data Files" 5Vvy:<.la  
    SetTextColor(255,0,0) J-,T^Wv  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." :wn![<`3q  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ^Y'>3o21f  
    SetTextColor(0,0,0) a<\m` Es=  
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    'Current directory of this script (should be the same as the text files being merged) CF>NyY:_  
    Dim cDir As String ?NHh=H\7u  
    cDir = MacroDir$ & "\" 92} ,A`=  
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    'Array which will be populated with the list of files to be merged mX2Qf8  
    Dim fList() As String, curFile As String {=R=\Y?r&  
    GetFileList( cDir, fList ) 8H{@0_M  
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    Print "" v.Q)Obyn  
    Print "Files found for merging:" ^rxXAc[  
    For Each curFile In fList iezz[;t  
        Print Chr(9) & curFile 2&Efqy8}DZ  
    Next @P@t/  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 'rCwPsI&4  
    Dim nameArray() As String, sampName As String Crey}A/N  
    nameArray = Split(fList(0)," 0-0.txt") 0Z@u6{Z9R  
    sampName  = nameArray(0) ZsV'-gu  
    Print "" 8`*`4m  
    Print "Sample name: " & Chr(9) & sampName n$~RgCf  
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    'Open an output file and write the FRED header data `#l_`j=r$  
    Dim outFile As String OY@
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    outFile = cDir & sampName & "_FRED.txt" f:BW{Cij;y  
    Open outFile For Output As #1 lual'~  
    Print #1, "type bsdf_data" Zo&U3b{Dy  
    Print #1, "format angles=deg bsdf=value scale=1" CP={|]>+S  
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    'Loop the file list, skip the two header lines and write the remaining data to file Q
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    Dim lineArray() As String, curLine As Long ;,IGO7R  
    For Each curFile In fList `Y'}\>.#  
        Print "Merging data from file " & curFile 5$9j&&R  
        ReadFile( cDir & curFile, lineArray ) p-Q1abl  
        For curLine = 2 To UBound(lineArray) xEZvCwsb  
            Print #1, lineArray(curLine) ,>e<mphM  
        Next vmk c]DC  
    Next G2em>W_n  
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    'Close the output file 3tgct <"  
    Close #1 ;H}?8L  
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    Print "Finished merging RPC data for sample " & sampName G:A` n;E0  
    Print "FRED formatted data file: " & Chr(9) & outFile "S6d^  
End Sub *!B,|]wq=  
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'Utility function to read the contents of a file into an array of strings. xe_c`%_  
Function ReadFile(ByVal fileName As String, _ [dUW3}APV  
                  ByRef lineArray() As String) As Long U${dWxC  
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    ReadFile = -1 t&-7AjS5  
    Dim oFSO As Object SVeL c  
    Set oFSO = CreateObject("Scripting.FileSystemObject") QhN5t/Hr  
    Erase lineArray HQ4o^WC  
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    Dim fid As Long 0 5 `x$f  
    If oFSO.fileexists( fileName ) Then B6|=kl2C  
        fid = FreeFile() Uv.{=H:  
        Open fileName For Input As fid Xo$(zGb  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) X$J  
        Close fid $,bLb5}Qu  
    End If ~|+  
    Set oFSO = Nothing lKwIlp  
    Return UBound( lineArray ) O-
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End Function ofRe4 *\j  
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Sub GetFileList( ByVal in_dir As String, _ "y#$| TMB  
                 ByRef in_flist() As String ) 02?y%  
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    'Redimension the file list array SmC91XO  
    Erase in_flist +.gZILw  
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    'Tracks how many files are found 1XL^Zhr  
    Dim fCount As Long N9idk}T  
    fCount = 0 iCa#OQ  
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    'Recurse directory and search for text files X`#vH8  
    Dim f As String qN[U|3k  
    f = Dir$(in_dir & "*.txt") #8rLB(  
    While f <> "" qgDd^0  
        ReDim Preserve in_flist(fCount) _KLKa/3  
        in_flist(fCount) = f J?LetyDNr]  
        fCount += 1 p~BEz?e  
        f = Dir$() c7,p5[  
    Wend M;-PrJdyt  
    ReDim Preserve in_flist(fCount-1) !CY:XQm  
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End Sub sA#}0>`3S