[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： CV& SNA  
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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。 G7),!Qol  
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背景： yXEC@#?|  
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。 =E,*8O]  
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。 
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步骤 |H |ewVUY  
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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。 35,SPR  
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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） t=yM}#r$  
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 ].Et&v  
例如下所示： =UYc~VUYnT  
Sample name:  EDF-C1-56 Rq\.RR](  
Merging data from file EDF-C1-56 0-0.txt yt<K!=7&  
Finished merging RPC data for sample EDF-C1-56 {WC{T2:8  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt \ (X~Z  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面
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a. 创建一个新的散射库 &]ImO RN  
b. 散射模型命名 fYH%vr)  
c. 改变散射模型为“Tabulated BSDF”. WJg?R^  
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 ） >Vg<J~[
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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。 l9SbuT$U  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， e
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g. 点击OK ,I)/ V>u  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 XLzHm&;  
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脚本代码： T"dEa-O  
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'#Language "WWB-COM" g8B@M*JA  
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Option Explicit QZd ,GY5{  
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Sub Main e&wWlB![  
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    'Cleanup \E0Uj>9+[  
    ClearOutputWindow() EY&hWl*a^  
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    Print "Merging RPC Photonics BSDF Data Files" d7l0;yR&+  
    SetTextColor(255,0,0) x==%BBnO%  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." IF@)L>-%  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." #,$d!l @  
    SetTextColor(0,0,0) Q;`#ujxL  
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    'Current directory of this script (should be the same as the text files being merged) /(XtNtO*  
    Dim cDir As String ZG<<6y*.  
    cDir = MacroDir$ & "\" )Ibp%'H  
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    'Array which will be populated with the list of files to be merged mO]>(^c  
    Dim fList() As String, curFile As String Cg-khRgLS  
    GetFileList( cDir, fList ) /Wk\6  
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    Print "" R`A@F2  
    Print "Files found for merging:" @Vc*JEW  
    For Each curFile In fList *qGxQ?/  
        Print Chr(9) & curFile 4Yx?75/  
    Next gNN{WFHQX:  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 7pmhH%Dn$  
    Dim nameArray() As String, sampName As String A=E1S{C  
    nameArray = Split(fList(0)," 0-0.txt") ~x`OCii  
    sampName  = nameArray(0) kcI3pmgj  
    Print "" 2et7Vw  
    Print "Sample name: " & Chr(9) & sampName gHA"O@HgDI  
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    'Open an output file and write the FRED header data hQPiGIs
  
    Dim outFile As String r#3(;N{=  
    outFile = cDir & sampName & "_FRED.txt" k)dLJ<EM  
    Open outFile For Output As #1 vt@.fT#e  
    Print #1, "type bsdf_data" KK}^E_v  
    Print #1, "format angles=deg bsdf=value scale=1" X.bNU  
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    'Loop the file list, skip the two header lines and write the remaining data to file $_% a=0  
    Dim lineArray() As String, curLine As Long -T`rk~A9A
 
    For Each curFile In fList 0vt?yD  
        Print "Merging data from file " & curFile Tf<1Z{9  
        ReadFile( cDir & curFile, lineArray ) ( {5LB4  
        For curLine = 2 To UBound(lineArray) `(.K|l}  
            Print #1, lineArray(curLine) q:+,'&<D  
        Next Ztr,v$  
    Next W{Ine> a'  
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    'Close the output file {-09,Q
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    Close #1 pMKnA.|  
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    Print "Finished merging RPC data for sample " & sampName g%Sl+gWdJ  
    Print "FRED formatted data file: " & Chr(9) & outFile #\_N-bVu  
End Sub .B+R+2uY3  
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'Utility function to read the contents of a file into an array of strings. y}FTLX $  
Function ReadFile(ByVal fileName As String, _ Ao69Qn  
                  ByRef lineArray() As String) As Long {'NdN+_C  
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    ReadFile = -1 #ih(I7prH  
    Dim oFSO As Object *?VbN}g2  
    Set oFSO = CreateObject("Scripting.FileSystemObject") )xy1DA  
    Erase lineArray kG^DHEne  
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    Dim fid As Long ]<V[H  
    If oFSO.fileexists( fileName ) Then !-_0I
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        fid = FreeFile() 5IE2&V  
        Open fileName For Input As fid $h"tg9L^)  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Ep>3%{V  
        Close fid
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    End If 3&^4%S{/  
    Set oFSO = Nothing R'`q0MoN1  
    Return UBound( lineArray ) 0GK<l  
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End Function ~Pq1@N>n  
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Sub GetFileList( ByVal in_dir As String, _ w]J9Kv1)-  
                 ByRef in_flist() As String ) ^1sX22k  
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    'Redimension the file list array K[!OfP  
    Erase in_flist *7u~`  
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    'Tracks how many files are found Soy!)
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    Dim fCount As Long B2w\  
    fCount = 0 $T.we+u  
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    'Recurse directory and search for text files U` uP^  
    Dim f As String ?mU 3foa  
    f = Dir$(in_dir & "*.txt") h,o/(GNnW  
    While f <> "" fl#gWAM  
        ReDim Preserve in_flist(fCount) RY3ANEu+  
        in_flist(fCount) = f uLX5khQ  
        fCount += 1 #; CC"  
        f = Dir$() ? FGzw  
    Wend Y&!M#7/'J3  
    ReDim Preserve in_flist(fCount-1) uu@Y]0-  
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End Sub V3DXoRE-8i  
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