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infotek 2025-07-22 07:54

RPC Photonics扩散片BSDF

摘要 }+B7C2_\  
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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。
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背景 mSzwx/3"  
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。 Cjh&$aq  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 u7;A`  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 YO Y+z\Q  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下,选择“Raw data”文件。 f 4 _\F/  
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图2. RPC Photonics工程漫射体不同类型的散射数据
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) j@ "`!uPz  
3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 =.%ZF]Oe+#  
例如下所示: cC[n~OV  
Sample name:  EDF-C1-56 -r2cK{Hhp&  
Merging data from file EDF-C1-56 0-0.txt wx!*fy4hL  
Finished merging RPC data for sample EDF-C1-56 H )}WWXK  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt KZE.}8^%D  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 bXfOZFzq)  
a. 创建一个新的散射库 @v'D9 ?  
b. 散射模型命名 zbR.Lb  
c. 改变散射模型为“Tabulated BSDF”. EH3G|3^xz  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) 0 mQ3P.9  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 &SM$oy#?  
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, ]UI+6}r  
g. 点击OK 2mO#vTX4  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 D 6]$P%t9  
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脚本代码 cg.e(@(  
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'#Language "WWB-COM" 9e&#;6l  
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Option Explicit ;?!rpj  
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Sub Main z|<oxF.  
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    'Cleanup ^zJ. W  
    ClearOutputWindow() `|w#K28t"  
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    Print "Merging RPC Photonics BSDF Data Files" 9O Q4\  
    SetTextColor(255,0,0) HH#i.s2  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 55DzBV  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." xdM#>z`;  
    SetTextColor(0,0,0) Mh|`XO.5I  
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    'Current directory of this script (should be the same as the text files being merged) 0q>lW &J  
    Dim cDir As String AL7O-D  
    cDir = MacroDir$ & "\" 4sQAR6_SW~  
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    'Array which will be populated with the list of files to be merged w2+]C&B*  
    Dim fList() As String, curFile As String N]}+F w\5  
    GetFileList( cDir, fList ) }tZAU\z  
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    Print "" I0vn d7  
    Print "Files found for merging:" "V0:Lq  
    For Each curFile In fList .^S78hr]n  
        Print Chr(9) & curFile RM1uYFs<  
    Next BmFME0  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. (VAL.v*  
    Dim nameArray() As String, sampName As String ;cn.s,  
    nameArray = Split(fList(0)," 0-0.txt") P i!r}m  
    sampName  = nameArray(0) xg^^@o  
    Print "" bMZn7c  
    Print "Sample name: " & Chr(9) & sampName d`<^+p)oy  
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    'Open an output file and write the FRED header data SWsv,  
    Dim outFile As String (y=o]Vy  
    outFile = cDir & sampName & "_FRED.txt" eJGos!>*  
    Open outFile For Output As #1 Qsxkw  
    Print #1, "type bsdf_data"  Gy6 qLM  
    Print #1, "format angles=deg bsdf=value scale=1" U<Y'.!  
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    'Loop the file list, skip the two header lines and write the remaining data to file %Dls36F  
    Dim lineArray() As String, curLine As Long o;>3z*9?3  
    For Each curFile In fList +7< >x-+  
        Print "Merging data from file " & curFile ~: <@`  
        ReadFile( cDir & curFile, lineArray ) d"6]?  
        For curLine = 2 To UBound(lineArray) Fg\| e%  
            Print #1, lineArray(curLine) w1#jVcUQ  
        Next KBRg95E~]l  
    Next h_chZB'  
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    'Close the output file lhA s!\F  
    Close #1 Owpg]p yVD  
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    Print "Finished merging RPC data for sample " & sampName .hlQ?\  
    Print "FRED formatted data file: " & Chr(9) & outFile RvSq KW8  
End Sub VUC <0WV  
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'Utility function to read the contents of a file into an array of strings. ?hJsN  
Function ReadFile(ByVal fileName As String, _ )*K<;WI WH  
                  ByRef lineArray() As String) As Long a5}44/%  
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    ReadFile = -1 -j`!(IJ  
    Dim oFSO As Object U 'CfP9=  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 2WPF{y%/  
    Erase lineArray .eabtGO,  
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    Dim fid As Long ;*-@OLT_K  
    If oFSO.fileexists( fileName ) Then nKh%E-c  
        fid = FreeFile() V4eng "  
        Open fileName For Input As fid Wz-3?EQ  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) w38c  
        Close fid _(6B.  
    End If :q>oD-b$}  
    Set oFSO = Nothing - Y8ks7  
    Return UBound( lineArray ) bwSRJFqb  
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End Function ,%?; \?b%h  
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Sub GetFileList( ByVal in_dir As String, _ Sj0 ucnuHi  
                 ByRef in_flist() As String )  ^%5~ ;  
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    'Redimension the file list array f3zfRhkIk  
    Erase in_flist H-_^TB  
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    'Tracks how many files are found 5 dfe@$  
    Dim fCount As Long hY.e[+  
    fCount = 0 {UdcX~\~  
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    'Recurse directory and search for text files w>6"Sc7oc2  
    Dim f As String Zk/' \(5  
    f = Dir$(in_dir & "*.txt") ]_ejDN\>{V  
    While f <> "" ;]gsJ9FK<  
        ReDim Preserve in_flist(fCount) i'W_;Y}  
        in_flist(fCount) = f ~U"by_  
        fCount += 1 ]27>a"p59Y  
        f = Dir$() I&pr_~.  
    Wend YPha9M$AgU  
    ReDim Preserve in_flist(fCount-1) ~aJW"\{  
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End Sub z^gQ\\,4  
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