[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： ST|x23|O]  
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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。 aHV;N#Lx3  
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背景： >Rl"  
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。 0.\/\V:H6  
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。 uu-PJTNZ  
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步骤 BnX0G1|#  
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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。 XPavReGf  
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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） &pP;Neh;  
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 ?U%qPv:  
例如下所示： |'e^QpU5  
Sample name:  EDF-C1-56 K='z G*$l  
Merging data from file EDF-C1-56 0-0.txt #oS<E1  
Finished merging RPC data for sample EDF-C1-56 8f_l}k$Eg  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt /,BD#|  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 ^a/gBC82x  
a. 创建一个新的散射库 sG(~^hJ_  
b. 散射模型命名 2A']yD  
c. 改变散射模型为“Tabulated BSDF”. o$wEEz*4  
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 ） ^+*N%yr  
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。 $|zX|  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， 6`&a&%,O  
g. 点击OK VRVO-Sk  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 |O{m2Fi  
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脚本代码： lz/8  
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'#Language "WWB-COM" I:E`PZ  
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Option Explicit Fh)IgzFj  
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Sub Main I!ED?n  
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    'Cleanup *zaQx+L  
    ClearOutputWindow() jqz ux[6{  
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    Print "Merging RPC Photonics BSDF Data Files" ! :Y:pu0  
    SetTextColor(255,0,0) ,A9]CQ  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." 3BzNi'  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." =R^%(Py  
    SetTextColor(0,0,0) ##q2mm:a9P  
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    'Current directory of this script (should be the same as the text files being merged) Ij 79~pn  
    Dim cDir As String KsddA  
    cDir = MacroDir$ & "\" l.(v^3:X  
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    'Array which will be populated with the list of files to be merged xn?a. 3b'  
    Dim fList() As String, curFile As String &U{#Kt5q  
    GetFileList( cDir, fList ) Z EQ@IS:Y  
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    Print "" FX;QG94!  
    Print "Files found for merging:" :)8VdWg  
    For Each curFile In fList 7( #:GD  
        Print Chr(9) & curFile '%>=ZhO  
    Next ^Xz@`_I  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. N'F77 .  
    Dim nameArray() As String, sampName As String n"$jG:AQJ  
    nameArray = Split(fList(0)," 0-0.txt") &PL8|w  
    sampName  = nameArray(0) #^#PP
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    Print "" adlV!k7RG  
    Print "Sample name: " & Chr(9) & sampName <3L5"77G6  
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    'Open an output file and write the FRED header data O6@j &*jS  
    Dim outFile As String .[YuRLGz  
    outFile = cDir & sampName & "_FRED.txt" H h4WMZJG  
    Open outFile For Output As #1 ]z;P9B3@&  
    Print #1, "type bsdf_data" 87=&^.~`  
    Print #1, "format angles=deg bsdf=value scale=1" y$;/Vm_
'  
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    'Loop the file list, skip the two header lines and write the remaining data to file ,t3wp#E2#  
    Dim lineArray() As String, curLine As Long Pi=+/}  
    For Each curFile In fList zlyS}x@p  
        Print "Merging data from file " & curFile K:J3Z5"  
        ReadFile( cDir & curFile, lineArray ) -7SAK1c$  
        For curLine = 2 To UBound(lineArray) f0!))/rSD  
            Print #1, lineArray(curLine) ,yC-+VL  
        Next SfA\}@3  
    Next 97Lte5c6r  
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    'Close the output file G`+T+  
    Close #1 K~uXO  
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    Print "Finished merging RPC data for sample " & sampName W'els)WJ|x  
    Print "FRED formatted data file: " & Chr(9) & outFile u\a#{G;Z  
End Sub ?xA:@:l/  
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'Utility function to read the contents of a file into an array of strings. "_P;2N6  
Function ReadFile(ByVal fileName As String, _ ,y1PbA0m  
                  ByRef lineArray() As String) As Long 1f%1*L0>@  
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    ReadFile = -1 md=TjMaY  
    Dim oFSO As Object 1}S S+>`  
    Set oFSO = CreateObject("Scripting.FileSystemObject") ycc4W*]  
    Erase lineArray 9K.V
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    Dim fid As Long 5
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    If oFSO.fileexists( fileName ) Then uyO/55;HO  
        fid = FreeFile() B{/R: Hm  
        Open fileName For Input As fid Y5f1lUT  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) B`YTl~4  
        Close fid dW_KU}  
    End If ]Gzm^6v  
    Set oFSO = Nothing b`(}.r?W  
    Return UBound( lineArray ) B3:ez jj  

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End Function y?rPlA_  
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Sub GetFileList( ByVal in_dir As String, _ yZ @"\Z!  
                 ByRef in_flist() As String ) tW.9yII  
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    'Redimension the file list array }bs+-K  
    Erase in_flist [I0:=yJ+  
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    'Tracks how many files are found k@\ iGqo  
    Dim fCount As Long C\\~E9+  
    fCount = 0 Nc1"g1JR  
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    'Recurse directory and search for text files Hek*R?M|  
    Dim f As String !-ok"k0,u  
    f = Dir$(in_dir & "*.txt") ;i8g41qjF  
    While f <> "" yu;+o3WlK  
        ReDim Preserve in_flist(fCount) b v G/|U  
        in_flist(fCount) = f cq5jPZ}  
        fCount += 1 ^b/ Z)3  
        f = Dir$() YO#M/%^j  
    Wend r/4``shg  
    ReDim Preserve in_flist(fCount-1) WM Fb4SUR  
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End Sub w&X<5'GM  
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