[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： =<@2#E)  
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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。 E(pF:po  
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背景： URgk^nt2p  
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。 q<W=#Sx  
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。 WS8+7O'1\  
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步骤 :,12")N  
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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。 lf<S_2i  
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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） <:>SGSE9  
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 j1
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例如下所示： 2aZw[7s  
Sample name:  EDF-C1-56 Qhi '')Q  
Merging data from file EDF-C1-56 0-0.txt 7tM9u5FF  
Finished merging RPC data for sample EDF-C1-56 B5V_e!*5F*  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 7M_U2cd|TD  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 O`GsS{$sS  
a. 创建一个新的散射库 _mvxsG  
b. 散射模型命名 -~[9U,  
c. 改变散射模型为“Tabulated BSDF”. ,C.:;Ime({  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） @oF$LMD  
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。  9fnA   
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 >Iewx G
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5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 >7`<!YJkK  
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脚本代码： UUK
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'#Language "WWB-COM" V=He_9B  
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Option Explicit W!blAkM%i  
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Sub Main
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    'Cleanup )Au6Nf  
    ClearOutputWindow() RgorkZlVM  
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    Print "Merging RPC Photonics BSDF Data Files" 5J)=}e  
    SetTextColor(255,0,0) do-ahl,  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." o@]So(9f  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." p(xC*KWB  
    SetTextColor(0,0,0) "\Egs)\  
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    'Current directory of this script (should be the same as the text files being merged) fJ\sguZ  
    Dim cDir As String K3uG2g(>2  
    cDir = MacroDir$ & "\" "'8KV\/D  
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    'Array which will be populated with the list of files to be merged n?\ nn3  
    Dim fList() As String, curFile As String !Fw?H3X!"q  
    GetFileList( cDir, fList ) n,eJ$2!J  
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    Print "" >-_d CNZ  
    Print "Files found for merging:" '}g*!jL  
    For Each curFile In fList uPYmHA}_/  
        Print Chr(9) & curFile cYx4~V^  
    Next wiaX&-c]8  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ;!91^Tl  
    Dim nameArray() As String, sampName As String nzjkX4KV  
    nameArray = Split(fList(0)," 0-0.txt") yc2/~a_Gx  
    sampName  = nameArray(0) 9jN)I(^D6  
    Print "" ,\ 2a=Fp  
    Print "Sample name: " & Chr(9) & sampName D'Z|}(d&  
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    'Open an output file and write the FRED header data i |{Dd%4vK  
    Dim outFile As String Am8x74?  
    outFile = cDir & sampName & "_FRED.txt" Eh-n  
    Open outFile For Output As #1 c`lJu_  
    Print #1, "type bsdf_data" 6.5T/D*TT  
    Print #1, "format angles=deg bsdf=value scale=1" dC
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    'Loop the file list, skip the two header lines and write the remaining data to file `28};B>  
    Dim lineArray() As String, curLine As Long ve ~05mg  
    For Each curFile In fList RH}A  
        Print "Merging data from file " & curFile DjU9 uZT  
        ReadFile( cDir & curFile, lineArray ) J};z85B  
        For curLine = 2 To UBound(lineArray) d=,%=@  
            Print #1, lineArray(curLine) 2,lqsd:xM  
        Next LG~S8u  
    Next ZpUCfS)|&  
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    'Close the output file bX.ja;;   
    Close #1 *A}cL  
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    Print "Finished merging RPC data for sample " & sampName v7%X@j]ji  
    Print "FRED formatted data file: " & Chr(9) & outFile b
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End Sub  tvXW  
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'Utility function to read the contents of a file into an array of strings. UgWs{y2SE.  
Function ReadFile(ByVal fileName As String, _ eI1GXQ%  
                  ByRef lineArray() As String) As Long HTe<x  
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    ReadFile = -1 )CX4kPj  
    Dim oFSO As Object k
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    Set oFSO = CreateObject("Scripting.FileSystemObject") _k^0m
 
    Erase lineArray [4fU+D2\d  
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    Dim fid As Long _U;e
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    If oFSO.fileexists( fileName ) Then &V|>dLT>A  
        fid = FreeFile() "NRDNqj(  
        Open fileName For Input As fid <foCb%$(?  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0!z@2[Pe66  
        Close fid Bl9jkq ]  
    End If qO`)F8  
    Set oFSO = Nothing p
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    Return UBound( lineArray ) @/r
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End Function O]f/r,4@  
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Sub GetFileList( ByVal in_dir As String, _ 0 ugT2%  
                 ByRef in_flist() As String ) j3q~E[Mz\  
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    'Redimension the file list array [m+iQVk'  
    Erase in_flist zI~owK)%Z  
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    'Tracks how many files are found 3~e8bcb  
    Dim fCount As Long nC {K$  
    fCount = 0 $+}+zZX5  
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    'Recurse directory and search for text files X-Wz:NA  
    Dim f As String y*{Zbz#{  
    f = Dir$(in_dir & "*.txt") zrVC8Wb  
    While f <> "" ,G#.BLH cX  
        ReDim Preserve in_flist(fCount) ?PTk1sB  
        in_flist(fCount) = f y2O4I'/5<  
        fCount += 1 |*RYq2y  
        f = Dir$() >;z<j$;F<  
    Wend fF*`'i=!  
    ReDim Preserve in_flist(fCount-1) KJE[+R H+z  
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End Sub 3D9!M-