[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： U0gZf5;*  
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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。 vJLGy]  
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背景： 84vd~Cf9  
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。 ~)^'5^  
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。 q3AqU?f  
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步骤 +$|fUn{  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 ia7<AwV  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） y~fKLIoz"  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 4;fuS_(X  
例如下所示： 2 /FQ;<L  
Sample name:  EDF-C1-56 jMgXIK\  
Merging data from file EDF-C1-56 0-0.txt Hs*["zFc  
Finished merging RPC data for sample EDF-C1-56 ,Cb3R|L8  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Keozn*fzI  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 L8 L1_  
a. 创建一个新的散射库 =hkYQq`Q  
b. 散射模型命名 oQ 2$z8  
c. 改变散射模型为“Tabulated BSDF”. _]-4d_&3(  
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 ） &W,jR|B  
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。 ZUHRATT-  
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， G@.MP| 2  
g. 点击OK $P=C7;  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 6Q^~O*cw  
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脚本代码： ;$QC_l''b  
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'#Language "WWB-COM" B1V{3  
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Option Explicit 3''Sx8p  
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Sub Main 8.i4QaU  
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    'Cleanup m[^lu1\wn  
    ClearOutputWindow() } o%^ Mu B  
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    Print "Merging RPC Photonics BSDF Data Files" dE7S[O  
    SetTextColor(255,0,0) q`VL i  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." "j@\a)a  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." .\n` 4A1z  
    SetTextColor(0,0,0) $-iEcxsi  
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    'Current directory of this script (should be the same as the text files being merged) "9wD|wsz  
    Dim cDir As String 5o#JHD  
    cDir = MacroDir$ & "\" >2'"}np
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    'Array which will be populated with the list of files to be merged 0B}4$STOo[  
    Dim fList() As String, curFile As String /|IPBU 5  
    GetFileList( cDir, fList ) VPe0\?!d  
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    Print "" *yu}e)(0  
    Print "Files found for merging:" l3
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    For Each curFile In fList K#0TD("  
        Print Chr(9) & curFile CkT(\6B-  
    Next 5E&#Kh(I  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. xu2KEwgb  
    Dim nameArray() As String, sampName As String 23s;O))  
    nameArray = Split(fList(0)," 0-0.txt") iwotEl0*{  
    sampName  = nameArray(0) 9}(w*>_L  
    Print "" E>!=~ 7.  
    Print "Sample name: " & Chr(9) & sampName 5*AXL.2ih  
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    'Open an output file and write the FRED header data 5(3O/C{?~  
    Dim outFile As String qt@L&v}~j  
    outFile = cDir & sampName & "_FRED.txt" K3T.l#d'L  
    Open outFile For Output As #1 &{}Mds  
    Print #1, "type bsdf_data" r
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    Print #1, "format angles=deg bsdf=value scale=1" 1( pHC  
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    'Loop the file list, skip the two header lines and write the remaining data to file Ri.tA  
    Dim lineArray() As String, curLine As Long Zh"m;l/]  
    For Each curFile In fList mdj%zJ8/  
        Print "Merging data from file " & curFile "Ms;sdjg}&  
        ReadFile( cDir & curFile, lineArray ) ?=VvFfv%  
        For curLine = 2 To UBound(lineArray) /jY u-H+C  
            Print #1, lineArray(curLine) J2YQdCL  
        Next B5b:znW2@  
    Next r|Ui1f5  
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    'Close the output file I;(3)^QH#  
    Close #1 L:z0cvn"  
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    Print "Finished merging RPC data for sample " & sampName ;_o]$hV|  
    Print "FRED formatted data file: " & Chr(9) & outFile |>.Q U3  
End Sub yvAO"43  
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'Utility function to read the contents of a file into an array of strings. v pI9TG  
Function ReadFile(ByVal fileName As String, _ Gt w>R  
                  ByRef lineArray() As String) As Long uDf<D.+5Ze  
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    ReadFile = -1 "6B7EH  
    Dim oFSO As Object :|S zD4Ag  
    Set oFSO = CreateObject("Scripting.FileSystemObject") :E:e ^$p  
    Erase lineArray I6>J.6luF9  
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    Dim fid As Long JJ?{V:  
    If oFSO.fileexists( fileName ) Then g@.$P>Bh  
        fid = FreeFile() .E4*>@M5  
        Open fileName For Input As fid PRKZg]?  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) nM,:f)z  
        Close fid -%nD'qy,.  
    End If La
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    Set oFSO = Nothing +$2{u_m,  
    Return UBound( lineArray ) N]<(cG&p  
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End Function Ey6R/M)?:y  
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Sub GetFileList( ByVal in_dir As String, _ 0RUk^  
                 ByRef in_flist() As String ) 2MkrVQQ9g  
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    'Redimension the file list array 1!#85SMx  
    Erase in_flist |V9[aa*c  
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    'Tracks how many files are found +H)'(<  
    Dim fCount As Long 5>k:PKHL  
    fCount = 0 Z>[7#;;  
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    'Recurse directory and search for text files dC11kqqj  
    Dim f As String =L6#=7hcl  
    f = Dir$(in_dir & "*.txt") Bo 35L:r|  
    While f <> "" 'ofj1%c  
        ReDim Preserve in_flist(fCount)  @MW@mP)#  
        in_flist(fCount) = f ui8 Q2{z  
        fCount += 1 v2T2/y%  
        f = Dir$() 3h:j.8Z  
    Wend eA!o#O.  
    ReDim Preserve in_flist(fCount-1) %!aU{E|@_  
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End Sub Z\&f"z?L  
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