[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： RV5X0  
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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。 Z9s tB>?  
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背景： $ +;`[b   
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。 wxXp(o(  
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。 OWFLw  
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步骤 }s=D,_}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。 Tm5]M$)  
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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,Boutd  
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 -Zd!0HNW1  
例如下所示： 1+RG@
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Sample name:  EDF-C1-56 V&<vRIsN  
Merging data from file EDF-C1-56 0-0.txt CN@bJo2  
Finished merging RPC data for sample EDF-C1-56 V} Y %9V  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 4[|^78  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 9D++SU2:}  
a. 创建一个新的散射库 W
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b. 散射模型命名 >S3iP?V7  
c. 改变散射模型为“Tabulated BSDF”. `uy)][j-  
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 ） 6wx;grt'Z  
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。 :}0y[qc3  
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， 9l9n
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g. 点击OK -! Hn,93  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 -l<b|`s=w.  
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脚本代码： e
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'#Language "WWB-COM" #N_C|v/  
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Option Explicit MZ o\1tU-i  
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Sub Main PXG)?`^NX  
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    'Cleanup R9nW5f Nf  
    ClearOutputWindow() N|5J-fR&  
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    Print "Merging RPC Photonics BSDF Data Files" nS)U+q-x&o  
    SetTextColor(255,0,0) T1jAY^^I  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." g-"@%ps  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." L\}o(P(  
    SetTextColor(0,0,0) Cqy84!Z<  
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    'Current directory of this script (should be the same as the text files being merged) j'FSd*5m  
    Dim cDir As String QNn\wz_)  
    cDir = MacroDir$ & "\" <QFT>#@T  
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    'Array which will be populated with the list of files to be merged p/L|;c  
    Dim fList() As String, curFile As String .
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    GetFileList( cDir, fList ) awh<CmcZ  
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    Print "" "n3r,  
    Print "Files found for merging:" WzZ<ZCHm  
    For Each curFile In fList o^FlQy\  
        Print Chr(9) & curFile F)_jW  
    Next   4R
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ~``oKiPg@  
    Dim nameArray() As String, sampName As String b{J
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    nameArray = Split(fList(0)," 0-0.txt") }M-^A{C\%  
    sampName  = nameArray(0)  PNY"Lqj  
    Print "" F \6-s`(  
    Print "Sample name: " & Chr(9) & sampName 8&<C.nKP  
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    'Open an output file and write the FRED header data U Hh  
    Dim outFile As String `~0)}K.F  
    outFile = cDir & sampName & "_FRED.txt" ]R[j]E.  
    Open outFile For Output As #1 N\{Xhr7d  
    Print #1, "type bsdf_data" -L&r2RF/  
    Print #1, "format angles=deg bsdf=value scale=1" x9Um4!/t  
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    'Loop the file list, skip the two header lines and write the remaining data to file 1"tyxAo\  
    Dim lineArray() As String, curLine As Long E{x<P0 ;  
    For Each curFile In fList hB/4.K]8  
        Print "Merging data from file " & curFile Z$ q{!aY  
        ReadFile( cDir & curFile, lineArray ) h=h4`uA9  
        For curLine = 2 To UBound(lineArray) 2GeJ\1k  
            Print #1, lineArray(curLine) mU@pRjq=  
        Next _wMxKM  
    Next =hD@hQi  
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    'Close the output file 5hN)y-4@  
    Close #1  %f3qCN  
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    Print "Finished merging RPC data for sample " & sampName D>tex/Of3  
    Print "FRED formatted data file: " & Chr(9) & outFile v$
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End Sub ! Rrk
 
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'Utility function to read the contents of a file into an array of strings. I)7STzlMj.  
Function ReadFile(ByVal fileName As String, _ {jdtNtw  
                  ByRef lineArray() As String) As Long oA/[>\y  
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    ReadFile = -1 xAJ N(8?  
    Dim oFSO As Object M~'4>h}  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ) 0NKL:u  
    Erase lineArray })#VO-J  
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    Dim fid As Long 3XykIj1  
    If oFSO.fileexists( fileName ) Then 5PF?Eq  
        fid = FreeFile() rdj_3Utv  
        Open fileName For Input As fid VZveNz@]r  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 7Yv1et |  
        Close fid YkWv*l  
    End If ki|KtKAu_9  
    Set oFSO = Nothing jGm`Qg{<  
    Return UBound( lineArray ) QjT$.pUd  
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End Function P"-*'q,9  
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Sub GetFileList( ByVal in_dir As String, _ |h^[/  
                 ByRef in_flist() As String ) #3VOC#.  
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    'Redimension the file list array "Y'MuV'x  
    Erase in_flist # <?igtUO  
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    'Tracks how many files are found ,gO}H)v]t  
    Dim fCount As Long %_P[ C}4  
    fCount = 0 $G\WW@*GE  
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    'Recurse directory and search for text files ) |t;nK,  
    Dim f As String IvZ,|R?  
    f = Dir$(in_dir & "*.txt") 7C;oMh5  
    While f <> "" YL?2gBT  
        ReDim Preserve in_flist(fCount) UY5wef2sF  
        in_flist(fCount) = f 5S9i>B  
        fCount += 1 ,|}}Ml
 
        f = Dir$() Aj{c s  
    Wend P^3`znq{  
    ReDim Preserve in_flist(fCount-1) ;{
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End Sub yf4I<v$y  
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