[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： bGZhUEq  
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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。 vF9*tK'   
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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。 L
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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 5z1\#" B[  
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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。 OD  
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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） p//T7rs  
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 lo cW_/  
例如下所示： ! 9d_Gf-  
Sample name:  EDF-C1-56 ~gu=x&{  
Merging data from file EDF-C1-56 0-0.txt y=[gQJ6~r  
Finished merging RPC data for sample EDF-C1-56 W3D
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt SV
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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 i/NDWVFD  
a. 创建一个新的散射库 _^_5K(Uq  
b. 散射模型命名 r0)JUc}Fyq  
c. 改变散射模型为“Tabulated BSDF”. 6yE'/VB<  
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 ） O{PW  
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。 f"vk# 3  
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， _,DO~L  
g. 点击OK }sf YCz  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 }TSgAwsbC  
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脚本代码： mfZ)^X  
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'#Language "WWB-COM" :~
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Option Explicit X6Un;UL  
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Sub Main +C'XS{K,#  
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    'Cleanup (jMtN?&0H-  
    ClearOutputWindow() DH:J  
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    Print "Merging RPC Photonics BSDF Data Files" ypH8QfxLTr  
    SetTextColor(255,0,0) (VR"Mi4  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." |)9thIQF  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." #S%4?  
    SetTextColor(0,0,0) G@9u:\[l  
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    'Current directory of this script (should be the same as the text files being merged) @!e~G'j%VD  
    Dim cDir As String os[ZIHph  
    cDir = MacroDir$ & "\" E(_KN[}S  
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    'Array which will be populated with the list of files to be merged VKy5=2&  
    Dim fList() As String, curFile As String auRY|j  
    GetFileList( cDir, fList ) /?Vdqci  
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    Print "" &M[MEO`t8  
    Print "Files found for merging:" ?KCivf  
    For Each curFile In fList )u0O_R  
        Print Chr(9) & curFile fe|g3>/|  
    Next hd5$yU5JQ  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. s D_G)c  
    Dim nameArray() As String, sampName As String COSTV>s;  
    nameArray = Split(fList(0)," 0-0.txt") Tp?-*K  
    sampName  = nameArray(0) #,&8&  
    Print "" lkb2?2\+  
    Print "Sample name: " & Chr(9) & sampName Z ] 
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    'Open an output file and write the FRED header data 34z+INkX  
    Dim outFile As String 4@6<  
    outFile = cDir & sampName & "_FRED.txt" T^]7R4Fg  
    Open outFile For Output As #1 ?W!ry7gXO  
    Print #1, "type bsdf_data" !4t`Hv?'  
    Print #1, "format angles=deg bsdf=value scale=1" \]8VwsP  
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    'Loop the file list, skip the two header lines and write the remaining data to file Q ]"jD#F  
    Dim lineArray() As String, curLine As Long 4d`+CD C  
    For Each curFile In fList G6V/SaD  
        Print "Merging data from file " & curFile 9OyNi  
        ReadFile( cDir & curFile, lineArray ) ]v\^&7pW  
        For curLine = 2 To UBound(lineArray) XFQNr`  
            Print #1, lineArray(curLine) H-
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        Next )t%h[0{{  
    Next @r<b:?u  
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    'Close the output file /;l[I=VI  
    Close #1 hbI;Hd  
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    Print "Finished merging RPC data for sample " & sampName >aG=T{  
    Print "FRED formatted data file: " & Chr(9) & outFile t`YWwI.  
End Sub ,[X_]e;  
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'Utility function to read the contents of a file into an array of strings.  WK==j1  
Function ReadFile(ByVal fileName As String, _ XQ?fJWLU  
                  ByRef lineArray() As String) As Long 
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    ReadFile = -1 % :/
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    Dim oFSO As Object 8eJE>g1J  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Ie@Jb{x  
    Erase lineArray Uw)=WImz[  
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    Dim fid As Long ?#BV+#(  
    If oFSO.fileexists( fileName ) Then sn"fK=,#g  
        fid = FreeFile() O~PChUU*Y  
        Open fileName For Input As fid Yw)Fbt^  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) xE1'&!4O  
        Close fid /e1(? 20  
    End If sbnjy"Z%  
    Set oFSO = Nothing I^_NC&m  
    Return UBound( lineArray ) zkexei4^<  
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End Function | -+zofx  
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Sub GetFileList( ByVal in_dir As String, _ !^WHZv4  
                 ByRef in_flist() As String ) P!e=b-T  
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    'Redimension the file list array <a|@t@R  
    Erase in_flist %e?fH.)  
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    'Tracks how many files are found @AQwr#R"l  
    Dim fCount As Long .Djta|puu  
    fCount = 0 4 1t
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    'Recurse directory and search for text files Qxa{UQh}9  
    Dim f As String Sh&PNJ
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    f = Dir$(in_dir & "*.txt") ->gZ)?Fqy  
    While f <> "" gU;&$  
        ReDim Preserve in_flist(fCount) 7\Fs=\2l+'  
        in_flist(fCount) = f I ~$1Lu`~  
        fCount += 1 ;ME)Og  
        f = Dir$() JOD/Raq.1k  
    Wend obo&1Uv,/  
    ReDim Preserve in_flist(fCount-1) ~h)&&'a  
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End Sub mLyBm  
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