[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： hU 7fZl%yl  
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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。 pQ 6#L  
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背景： RfBb{?PP)  
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。 'pY;]^M  
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。 ~ ZL`E  
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步骤 !Blk=L+p  
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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。 |{)xC=  
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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） 9.zQ<k2  
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 L~{Vt~H9"  
例如下所示： 1Wk EPj,  
Sample name:  EDF-C1-56 9ET+k(wI@  
Merging data from file EDF-C1-56 0-0.txt {p|%hhTK%  
Finished merging RPC data for sample EDF-C1-56 B  bw1k  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt y8vH?^:%<  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 6b70w @P!  
a. 创建一个新的散射库 lK,=`x
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b. 散射模型命名 J,G9m4Z7  
c. 改变散射模型为“Tabulated BSDF”. IZ0$=aB7  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） X8 )>}#:  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 h+3Z.WKhwP  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， 
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g. 点击OK RLz`aBT  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 _P<lG[V  
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脚本代码： 18"VB50b}  
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'#Language "WWB-COM" As~p1%nok  
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Option Explicit [A9,!YY  
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Sub Main 5o| !f  
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    'Cleanup
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    ClearOutputWindow() 4A/,X>W61  
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    Print "Merging RPC Photonics BSDF Data Files" NhK(HTsvK  
    SetTextColor(255,0,0) As'M39*V  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 4@]xn  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." c =N]! ,MO  
    SetTextColor(0,0,0) *_<*bhR<  
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    'Current directory of this script (should be the same as the text files being merged) {9Mdt`WL  
    Dim cDir As String mu6xL QdA  
    cDir = MacroDir$ & "\" vvsNWA
 
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    'Array which will be populated with the list of files to be merged +%#MrNM'  
    Dim fList() As String, curFile As String 03QEXm~|Q  
    GetFileList( cDir, fList ) /GuSIZg"_  
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    Print "" {#*?S>DA  
    Print "Files found for merging:" rZ.a>'T4  
    For Each curFile In fList 6Sb'Otw.  
        Print Chr(9) & curFile B~!G lT  
    Next rF'^w56  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 'hlB;z|T  
    Dim nameArray() As String, sampName As String F%.9fUo  
    nameArray = Split(fList(0)," 0-0.txt") L_gsG|xX  
    sampName  = nameArray(0) Wt+y-ES  
    Print "" ;V"yMWjc  
    Print "Sample name: " & Chr(9) & sampName *mQDS.'AB@  
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    'Open an output file and write the FRED header data ]\a\6&R  
    Dim outFile As String t$y&=v  
    outFile = cDir & sampName & "_FRED.txt" BH#C<0="  
    Open outFile For Output As #1 :%uyy5AZ  
    Print #1, "type bsdf_data" .hQ3A"  
    Print #1, "format angles=deg bsdf=value scale=1" @r/Id
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    'Loop the file list, skip the two header lines and write the remaining data to file Y-%l7GErhL  
    Dim lineArray() As String, curLine As Long g8+4$2`ny  
    For Each curFile In fList g^z5fFLg/8  
        Print "Merging data from file " & curFile qXU:A-IdIl  
        ReadFile( cDir & curFile, lineArray )  &6\r  
        For curLine = 2 To UBound(lineArray) AY&9JSu6  
            Print #1, lineArray(curLine) n~,]KdU]  
        Next k,;lyE  
    Next TRk ?8  
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    'Close the output file W>?f^C!+m  
    Close #1 Pe$^Mo.q  
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    Print "Finished merging RPC data for sample " & sampName IYf
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    Print "FRED formatted data file: " & Chr(9) & outFile >?>ubM`,  
End Sub NoJnchiU  
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'Utility function to read the contents of a file into an array of strings. Ok}{jwJ%W;  
Function ReadFile(ByVal fileName As String, _ FI?gT  
                  ByRef lineArray() As String) As Long >J^7}J  
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    ReadFile = -1 V6@*\+:3)  
    Dim oFSO As Object J|gdO+  
    Set oFSO = CreateObject("Scripting.FileSystemObject") yN9$gfJC^  
    Erase lineArray GhG%>U#&a  
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    Dim fid As Long ~j/bCMEf!  
    If oFSO.fileexists( fileName ) Then Q? <-`7  
        fid = FreeFile() lBlSNDs  
        Open fileName For Input As fid u[V4OU}%  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 3{NaZIk  
        Close fid ;g: UE  
    End If +,&m7L  
    Set oFSO = Nothing }g>dn  
    Return UBound( lineArray ) Q^a&qYK  
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End Function LN@E\wRw{r  


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Sub GetFileList( ByVal in_dir As String, _ )myf)"l5  
                 ByRef in_flist() As String ) 0Y5LDP  
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    'Redimension the file list array J6)efX)j-p  
    Erase in_flist x[vpoB+c  
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    'Tracks how many files are found ]regi- LGU  
    Dim fCount As Long 4*0:bhhhf_  
    fCount = 0 cm@jt\D  
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    'Recurse directory and search for text files Y3vX)D}  
    Dim f As String 5z1\#" B[  
    f = Dir$(in_dir & "*.txt") cJxW;WI!,  
    While f <> "" OD  
        ReDim Preserve in_flist(fCount) >
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        in_flist(fCount) = f ;\<""Yj@l  
        fCount += 1 p//T7rs  
        f = Dir$() lo cW_/  
    Wend ! 9d_Gf-  
    ReDim Preserve in_flist(fCount-1) ~gu=x&{  
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End Sub W3D
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