[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： 6+b!|`?l+  
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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。 3fgVvt-2  
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背景：
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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。 Wf^6:  
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。 FX`SaY>D  
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步骤 9XImg
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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。 l`G .lM(  
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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） :@a8>i1&  
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 6}
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例如下所示： sPuNwVX>}I  
Sample name:  EDF-C1-56 yANk(  
Merging data from file EDF-C1-56 0-0.txt x9)^0Hbo  
Finished merging RPC data for sample EDF-C1-56 Tp2`eY5  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 'te4mY}  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 FO#`}? R`  
a. 创建一个新的散射库 JE9SPFQx9M  
b. 散射模型命名 }ac0}  
c. 改变散射模型为“Tabulated BSDF”. X-%XZDB6  
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 ） RoCX*3d  
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。 Q>]FO  
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， FJDx80J  
g. 点击OK &i179Qg!  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 MA0}BJoW  
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脚本代码： M}2a/}4
 
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'#Language "WWB-COM" :Lu=t3#  
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Option Explicit [+<lm 5t  

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Sub Main ^EY^.?Mg  
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    'Cleanup ~ HFDX@m*  
    ClearOutputWindow() ;K]6/Wt  
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    Print "Merging RPC Photonics BSDF Data Files" Gxx:<`[ON  
    SetTextColor(255,0,0) YTP6m9hA+  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." s|L}wtc  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." !cS A|C  
    SetTextColor(0,0,0) Nr 5h%<`I  
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    'Current directory of this script (should be the same as the text files being merged) 7~(|q2ib  
    Dim cDir As String Al
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    cDir = MacroDir$ & "\" `(NMHXgG+  
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    'Array which will be populated with the list of files to be merged F} d>pK9fn  
    Dim fList() As String, curFile As String aF2vw{wT}  
    GetFileList( cDir, fList ) 7`AQn],  
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    Print "" O%feBe  
    Print "Files found for merging:" sswYwU  
    For Each curFile In fList X;`XkOjk  
        Print Chr(9) & curFile $]O;D~
 
    Next 0G@sj7)]  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. -:Up$6PR  
    Dim nameArray() As String, sampName As String Ps=OL\i  
    nameArray = Split(fList(0)," 0-0.txt") t0t" =(d  
    sampName  = nameArray(0) a?&{eMEe}  
    Print "" .[YM0dt  
    Print "Sample name: " & Chr(9) & sampName 5`];[M9  
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    'Open an output file and write the FRED header data rfj>/?8!@  
    Dim outFile As String T#&tf
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    outFile = cDir & sampName & "_FRED.txt" aLzRbRv  
    Open outFile For Output As #1 OX|nYTp  
    Print #1, "type bsdf_data" aNn\URR  
    Print #1, "format angles=deg bsdf=value scale=1" Npu#.)G  
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    'Loop the file list, skip the two header lines and write the remaining data to file s'/b&Idf8  
    Dim lineArray() As String, curLine As Long 6R_G{AWLL  
    For Each curFile In fList H#yBWvj*H  
        Print "Merging data from file " & curFile rO#WG
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        ReadFile( cDir & curFile, lineArray ) `rt?n|*
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        For curLine = 2 To UBound(lineArray) #Fp5>%*  
            Print #1, lineArray(curLine) ;Ohabbj*  
        Next c*iZ6j"iI  
    Next e
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    'Close the output file )<Cf,R  
    Close #1 eRV4XB:  
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    Print "Finished merging RPC data for sample " & sampName Ih_2")d
  
    Print "FRED formatted data file: " & Chr(9) & outFile ZV:cgv  
End Sub 1$1s0yg  
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'Utility function to read the contents of a file into an array of strings. Ns3k(j16  
Function ReadFile(ByVal fileName As String, _ E RnuM  
                  ByRef lineArray() As String) As Long (- ]A1WQ?  
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    ReadFile = -1 HP`dfo~j  
    Dim oFSO As Object o{C7V*  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Rn] `_[)*~  
    Erase lineArray ^P)W/2  
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    Dim fid As Long TV^m1uC  
    If oFSO.fileexists( fileName ) Then 0[ (Z48  
        fid = FreeFile() kH&KE5  
        Open fileName For Input As fid  ]I pLF#  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) }ZPO^4H;-  
        Close fid '!$g<= @  
    End If @(k}q3b<  
    Set oFSO = Nothing ?_hKhn%K9  
    Return UBound( lineArray ) Q7<_>)e^  
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End Function J`uO~W"  
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Sub GetFileList( ByVal in_dir As String, _ ;;A8*\*$  
                 ByRef in_flist() As String ) *OoM[wEY  
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    'Redimension the file list array iR_j h=2{  
    Erase in_flist nu'r`  
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    'Tracks how many files are found pb>TUKvT&  
    Dim fCount As Long *<.{sx^Gk  
    fCount = 0 +>v3&[lGv  
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    'Recurse directory and search for text files ]VuB2L[D  
    Dim f As String Nn`l+WA3  
    f = Dir$(in_dir & "*.txt") YU*u!  
    While f <> "" QJeL&mf  
        ReDim Preserve in_flist(fCount) olHT* mr  
        in_flist(fCount) = f C2l=7+X#W  
        fCount += 1 HUP~  
        f = Dir$() yJyovfJz.  
    Wend [;/4'  
    ReDim Preserve in_flist(fCount-1) !c 3c%=W  
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End Sub T/m4jf2  
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