[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： k5%0wHpk=  
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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。 0jJ28.kOp  
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背景： N7HbOLpM  
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。 Zc\h15+P  
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。 7~l  
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步骤 ^I0GZG  

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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。 23\j1?  
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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） Z>w^j.(  
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 @F(3*5c_Y  
例如下所示： %L\{kUam  
Sample name:  EDF-C1-56 6aF'^6+a  
Merging data from file EDF-C1-56 0-0.txt ?4,*RCaI  
Finished merging RPC data for sample EDF-C1-56 6|9g4@Hy  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Xv7U<
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4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 hNq8 uyKx  
a. 创建一个新的散射库 $kD`$L@U  
b. 散射模型命名 c]aK N  
c. 改变散射模型为“Tabulated BSDF”. r@ T-Hi  
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 ） \BbOljM=  
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。 RqN_vk\  
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， ;*g*DIR  
g. 点击OK X~)V)'R  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值  uRB)g  
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脚本代码： 
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'#Language "WWB-COM" `3sy>GU?  
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Option Explicit 9OQ0Yc!3  
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Sub Main XEUa  
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    'Cleanup S4{Mu(^xT  
    ClearOutputWindow() K5)yM @cq  
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    Print "Merging RPC Photonics BSDF Data Files"  ENYF0wW  
    SetTextColor(255,0,0) %g]$Vfpy  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." "3Xv%U9@  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." :uIi ?  
    SetTextColor(0,0,0) 7$1fy0f[l  
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    'Current directory of this script (should be the same as the text files being merged) P+;CE|J`X  
    Dim cDir As String dY4k9
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    cDir = MacroDir$ & "\" dIk8TJ  
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    'Array which will be populated with the list of files to be merged j2o1"  
    Dim fList() As String, curFile As String A'~%
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    GetFileList( cDir, fList ) Mg a@JA"  
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    Print "" _Ra<|NVQh  
    Print "Files found for merging:" dK J@{d  
    For Each curFile In fList x:A-p..e  
        Print Chr(9) & curFile Uxk[O  
    Next &sZ9$s:(^  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement.
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    Dim nameArray() As String, sampName As String EI=Naq  
    nameArray = Split(fList(0)," 0-0.txt") AK@`'$  
    sampName  = nameArray(0) RVgPH<1X@e  
    Print "" LL= Z$U $  
    Print "Sample name: " & Chr(9) & sampName |P,zGy  
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    'Open an output file and write the FRED header data (b/A|hl  
    Dim outFile As String wQD0vsD  
    outFile = cDir & sampName & "_FRED.txt" MG7 ?N #  
    Open outFile For Output As #1 Q)LXL.0h  
    Print #1, "type bsdf_data" d}{LM!s  
    Print #1, "format angles=deg bsdf=value scale=1" @pF fpHq?>  
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    'Loop the file list, skip the two header lines and write the remaining data to file u0bfX,e2U  
    Dim lineArray() As String, curLine As Long BR& Aq  
    For Each curFile In fList X$7Oo^1;  
        Print "Merging data from file " & curFile N|!MO{sB  
        ReadFile( cDir & curFile, lineArray ) v"P&`1=T  
        For curLine = 2 To UBound(lineArray) W_[|X}lWP  
            Print #1, lineArray(curLine) X(Y#9N"  
        Next e2]
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    Next e/"yGQu  
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    'Close the output file ADv^eJJ|  
    Close #1 u*t,
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    Print "Finished merging RPC data for sample " & sampName prNhn:j  
    Print "FRED formatted data file: " & Chr(9) & outFile ,op]-CY5  
End Sub _BZ1Vnv  
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'Utility function to read the contents of a file into an array of strings. G(U9rJ9  
Function ReadFile(ByVal fileName As String, _ qP~WEcH`[  
                  ByRef lineArray() As String) As Long 1R0ffP]  
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    ReadFile = -1 X+=-f^)&  
    Dim oFSO As Object $&cz$jyY  
    Set oFSO = CreateObject("Scripting.FileSystemObject") T>}0) s  
    Erase lineArray  f~w>v  
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    Dim fid As Long 3lo;^KX !  
    If oFSO.fileexists( fileName ) Then si_W:mLF{a  
        fid = FreeFile() $4Z+F#mx  
        Open fileName For Input As fid BjJ,"sT  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 2O eshkE  
        Close fid &
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    End If &&[zT/]P  
    Set oFSO = Nothing #SKfE  
    Return UBound( lineArray ) !Y (apVQ  
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End Function +7,8w  
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Sub GetFileList( ByVal in_dir As String, _ 6cJ<9i &  
                 ByRef in_flist() As String ) I*EJHBsQ5  
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    'Redimension the file list array 4-mVB wq  
    Erase in_flist \gLxC  
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    'Tracks how many files are found n.*3,4.]  
    Dim fCount As Long LO)GTyzvJ  
    fCount = 0 vxZg &SRK  
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    'Recurse directory and search for text files tR kF   
    Dim f As String 8{dEpV*  
    f = Dir$(in_dir & "*.txt") 6?N4l ]l  
    While f <> "" v
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        ReDim Preserve in_flist(fCount) KU-'+k2s;p  
        in_flist(fCount) = f j&5G\6:  
        fCount += 1 ((XE\V\}Z  
        f = Dir$() 089 k.WG  
    Wend LheFQ A  
    ReDim Preserve in_flist(fCount-1) k<H%vg>{~s  
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End Sub I,b9t\(6  
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