[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： ?u{Mz9:?HT  
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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。 1
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背景： Y!(w
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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。 F5UHkv"K&O  
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。 3-0jxx(  
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步骤 eXLdb-  
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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。 PCBV6Y7r  
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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） h^{aG])  
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 o/RGzPR  
例如下所示： {FC<vx{42  
Sample name:  EDF-C1-56 *`bES V :  
Merging data from file EDF-C1-56 0-0.txt +).=}.k  
Finished merging RPC data for sample EDF-C1-56 -s91/|n  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt hn&NypI  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 S =sL:FC  
a. 创建一个新的散射库 ph~#{B(\  
b. 散射模型命名 S->S
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c. 改变散射模型为“Tabulated BSDF”. pBu}c<  
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 ） )4YtdAV  
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。 WUx2CK2N  
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， fB4z
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g. 点击OK W,t`DMC  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 r6:nYyF$)v  
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脚本代码： gp{Z]{io  
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'#Language "WWB-COM" J,`I>^G  
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Option Explicit _z"\3hZ  
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Sub Main BJZGQrsz  
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    'Cleanup l2LO,j}  
    ClearOutputWindow() )d=&X|S>  
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    Print "Merging RPC Photonics BSDF Data Files" mO0#xY_z  
    SetTextColor(255,0,0) ~~,#<g[  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." _[hVGCS
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    Print "Note: Do not run this script multiple times without deleting the output file between executions." &e4EZ  
    SetTextColor(0,0,0) )Z`OkkabnD  
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    'Current directory of this script (should be the same as the text files being merged) <$nMqUu0  
    Dim cDir As String pD6a+B\;k  
    cDir = MacroDir$ & "\" <+`}: A  
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    'Array which will be populated with the list of files to be merged \mwxV!!b$  
    Dim fList() As String, curFile As String ~</H>Jd  
    GetFileList( cDir, fList ) 4}^\&K&t{  
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    Print "" t(- 5l  
    Print "Files found for merging:" UO>S2u  
    For Each curFile In fList 4?7OP t6  
        Print Chr(9) & curFile `]l[p+DO  
    Next VZU@G)rd  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. OFw93UJ Y  
    Dim nameArray() As String, sampName As String $
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    nameArray = Split(fList(0)," 0-0.txt") @|7e~U  
    sampName  = nameArray(0)  ] 2lhJ  
    Print "" [PU0!W;  
    Print "Sample name: " & Chr(9) & sampName |w`Q$ c  
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    'Open an output file and write the FRED header data x):h|/B  
    Dim outFile As String H|B4.z  
    outFile = cDir & sampName & "_FRED.txt" {(`xA,El  
    Open outFile For Output As #1 =q*j". <  
    Print #1, "type bsdf_data" &28%~&L  
    Print #1, "format angles=deg bsdf=value scale=1" nnnq6Z}  
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    'Loop the file list, skip the two header lines and write the remaining data to file C5'#0}6i  
    Dim lineArray() As String, curLine As Long _O>8jH!#  
    For Each curFile In fList kT{d pGU9  
        Print "Merging data from file " & curFile gA DF  
        ReadFile( cDir & curFile, lineArray ) 5!d'RBO   
        For curLine = 2 To UBound(lineArray) q*K.e5"
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            Print #1, lineArray(curLine) :+}Eo9  
        Next Ha20g/UN.  
    Next ^y&sKO  
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    'Close the output file =xsTVT;sj  
    Close #1 1mz72K  
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    Print "Finished merging RPC data for sample " & sampName vBjrI*0  
    Print "FRED formatted data file: " & Chr(9) & outFile U>kL|X3 V  
End Sub .t|B6n!  
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'Utility function to read the contents of a file into an array of strings. NYp46;  
Function ReadFile(ByVal fileName As String, _ JG!@(lr  
                  ByRef lineArray() As String) As Long i6D66E  
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    ReadFile = -1 T0P_&E@X  
    Dim oFSO As Object p v*n.U6  
    Set oFSO = CreateObject("Scripting.FileSystemObject") dn@_\5  
    Erase lineArray a/H|/CB3  
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    Dim fid As Long 'z3I*[!  
    If oFSO.fileexists( fileName ) Then X=i",5;  
        fid = FreeFile() |4|j5<5  
        Open fileName For Input As fid d;O4)8>  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) YA%0{Tdxz  
        Close fid YB'BAX<lI  
    End If 5]yby"Z?}  
    Set oFSO = Nothing \J,pV  
    Return UBound( lineArray ) mR6hnKa_53  
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End Function L4-v'Z;  
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Sub GetFileList( ByVal in_dir As String, _ ky-9I<Z,,  
                 ByRef in_flist() As String ) ?hS&OtW   
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    'Redimension the file list array Sn!5/9Y  
    Erase in_flist }IGoPCV|  
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    'Tracks how many files are found aJ^RY5  
    Dim fCount As Long \t^h|<`  
    fCount = 0 $c<NEt_\  
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    'Recurse directory and search for text files >crFIkOJ  
    Dim f As String yRv4,{B}X>  
    f = Dir$(in_dir & "*.txt") /[RO>Z9  
    While f <> "" #1oyRD-  
        ReDim Preserve in_flist(fCount) M"
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        in_flist(fCount) = f DZE@C^0%  
        fCount += 1 <P1yA>=3`  
        f = Dir$() 7@uhw">mX  
    Wend =/SBZLR(9  
    ReDim Preserve in_flist(fCount-1) 5VR=D\j  
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End Sub YecV+K'p:  
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