[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： EF}Z+7A  
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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。 TkK- r(=  
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背景： F
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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。 DBO
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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。 W8\K_M}  
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步骤 ?QZ\KY  
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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。 A|jaWZM-  
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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） IGVNX2
 
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 `_<K#AGAi  
例如下所示： !J.qH%S5  
Sample name:  EDF-C1-56 >Efv?8$E\  
Merging data from file EDF-C1-56 0-0.txt $/6.4"j  
Finished merging RPC data for sample EDF-C1-56 \acjv|]  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt :o=[Zp~B4d  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 3nxJ`W5j  
a. 创建一个新的散射库 [CJ&Yz Ji  
b. 散射模型命名 8LB+}N(8f  
c. 改变散射模型为“Tabulated BSDF”. u3Ua>A-  
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 ） S's\M5  
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。 :FB#,AOa_  
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， m@)K]0g<f  
g. 点击OK C;M.dd  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 GKSfr8US4  
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脚本代码： In5'(UHW:  

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'#Language "WWB-COM" jCxw|tmgq  
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Option Explicit ZEp UHdin  
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Sub Main tGe|@.!  
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    'Cleanup O:WFh;c  
    ClearOutputWindow() y#o ,Vg*V  
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    Print "Merging RPC Photonics BSDF Data Files" _m#M^<0n  
    SetTextColor(255,0,0) x<4-Q6'{S  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." \|RP-8  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." G ,An8GR%&  
    SetTextColor(0,0,0) !0{":4\  
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    'Current directory of this script (should be the same as the text files being merged) QD-#sU]  
    Dim cDir As String x/ lW=EQ  
    cDir = MacroDir$ & "\" @;!s"!~sv  
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    'Array which will be populated with the list of files to be merged lZ'-?xo  
    Dim fList() As String, curFile As String E80C0Q+V  
    GetFileList( cDir, fList ) %s6|w=.1  
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    Print "" $_%yr ~2  
    Print "Files found for merging:" :Em[>XA  
    For Each curFile In fList |MY6vRJ(  
        Print Chr(9) & curFile O|}97a^  
    Next k.NgE/;3  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. )<nr;n  
    Dim nameArray() As String, sampName As String uW},I6g  
    nameArray = Split(fList(0)," 0-0.txt") e?rp$kq7  
    sampName  = nameArray(0) eYLeytF]Uy  
    Print "" ^&>(_I\w.6  
    Print "Sample name: " & Chr(9) & sampName dq?{?~3  
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    'Open an output file and write the FRED header data a=>PGriL  
    Dim outFile As String epqX2`!V  
    outFile = cDir & sampName & "_FRED.txt" O'a Srjl  
    Open outFile For Output As #1 6&5p3G{%0  
    Print #1, "type bsdf_data" TL lR"L5  
    Print #1, "format angles=deg bsdf=value scale=1" B[w~bW|K
 
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    'Loop the file list, skip the two header lines and write the remaining data to file )/A IfH  
    Dim lineArray() As String, curLine As Long t
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    For Each curFile In fList C(qqGK{  
        Print "Merging data from file " & curFile a*@ 6G  
        ReadFile( cDir & curFile, lineArray ) R/&Bze  
        For curLine = 2 To UBound(lineArray) n@r'b{2;l  
            Print #1, lineArray(curLine) `Hld#+R  
        Next Ju4={^#  
    Next WB<_AIt+  
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    'Close the output file *J&XM[t  
    Close #1 %Aq+t&-BCX  
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    Print "Finished merging RPC data for sample " & sampName 8(J&_7u  
    Print "FRED formatted data file: " & Chr(9) & outFile KAH9?zI)M  
End Sub H}5zKv.T  
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'Utility function to read the contents of a file into an array of strings. AC:cV='  
Function ReadFile(ByVal fileName As String, _ pVbgjJI  
                  ByRef lineArray() As String) As Long B
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    ReadFile = -1 0 UdAF  
    Dim oFSO As Object s=9gp$9m  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 9un* 1%  
    Erase lineArray o\6A]T=R  
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    Dim fid As Long OCIWQ/ P  
    If oFSO.fileexists( fileName ) Then JsAl;w  
        fid = FreeFile() huVw+vAA  
        Open fileName For Input As fid frV*
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        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 6B>1"h%Wf  
        Close fid HF>Gf2-C  
    End If "e4;xU-  
    Set oFSO = Nothing (T+fO}0  
    Return UBound( lineArray ) ~H"Q5Hr  
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End Function r:Uqtqxh  
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Sub GetFileList( ByVal in_dir As String, _ } m5AO4:  
                 ByRef in_flist() As String ) 6apK]PT  
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    'Redimension the file list array V8AF;1c?-'  
    Erase in_flist v|r\kr k  
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    'Tracks how many files are found ;{
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    Dim fCount As Long R(_UR)G0 @  
    fCount = 0 XwWp4`Fd  
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    'Recurse directory and search for text files Ws2SD6!4`  
    Dim f As String ti6\~SY  
    f = Dir$(in_dir & "*.txt") "";[U  
    While f <> "" .u[hK  
        ReDim Preserve in_flist(fCount) C/AqAW1  
        in_flist(fCount) = f ;\~{79c  
        fCount += 1 rw>X JE  
        f = Dir$() &+F|v(|r  
    Wend f`Km ctI  
    ReDim Preserve in_flist(fCount-1) i=
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End Sub g+shz{3zvz