[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： =W6AUN/%p  
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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。 8#9d
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背景： d+_wN2  
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。 ^;b$`*M1  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件，其在杂散光分析中独特的算法、高效的准确性，使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 n y7
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步骤 .~+I"V{yF  
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1、 在http://www.rpcphotonics.com/bsdf-data-optical-diffusers/下载并解压BSDF数据到某一文件夹下，选择“Raw data”文件。 d3fF|Wp1  
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。（脚本代码放在了本文的最后） 3McBTa!  
3、 打开FRED并运行脚本文件，会输出如下“<SAMPLE>_FRED.txt”格式，<SAMPLE>即为RPC Photonics散射片数据集 7.n/W|\  
例如下所示： 2Rc'1sCth-  
Sample name:  EDF-C1-56 Vj7(6'Hg  
Merging data from file EDF-C1-56 0-0.txt +)C?v&N  
Finished merging RPC data for sample EDF-C1-56 4}FuoQL  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Kf<-PA  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 p!MOp-;-  
a. 创建一个新的散射库 e~C^*wL  
b. 散射模型命名 Ds4n>V,o  
c. 改变散射模型为“Tabulated BSDF”. NrE&w H:  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） rzH*|B0g  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 4#$~gTc@  
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， n{dl-P  
g. 点击OK !@9Vq6  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 M^\#(0^2@  
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脚本代码： }ZMbTsm  
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'#Language "WWB-COM"
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Option Explicit b{|Ha3;w  
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Sub Main uV r6tb1  
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    'Cleanup ozZW7dveU  
    ClearOutputWindow() !Pf_he  
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    Print "Merging RPC Photonics BSDF Data Files" 5CZii=@  
    SetTextColor(255,0,0) A"t~ )  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." *ip2|2G$  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." */iD68r|-  
    SetTextColor(0,0,0) ;/$=!9^sZ  
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    'Current directory of this script (should be the same as the text files being merged) bce>DLF  
    Dim cDir As String -~O7.E(ok  
    cDir = MacroDir$ & "\" tG(#&54  
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    'Array which will be populated with the list of files to be merged zc&>RM  
    Dim fList() As String, curFile As String X}.y-X#v5J  
    GetFileList( cDir, fList ) A;nrr1-0  
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    Print "" gP
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    Print "Files found for merging:" T8& kxp  
    For Each curFile In fList VG*Tdaua~  
        Print Chr(9) & curFile $2Y'[Dto\  
    Next (H/JB\~r  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. )UA$."~O  
    Dim nameArray() As String, sampName As String lP*_dt9  
    nameArray = Split(fList(0)," 0-0.txt") %$/t`'&o-  
    sampName  = nameArray(0) 7%C6hEP/*W  
    Print "" H79XP.TtE  
    Print "Sample name: " & Chr(9) & sampName iaAVGgA9+  
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    'Open an output file and write the FRED header data D_oGhQYY4  
    Dim outFile As String cn&\q.!fh  
    outFile = cDir & sampName & "_FRED.txt" _-aQ.p ?T  
    Open outFile For Output As #1 iiS^xqSNCt  
    Print #1, "type bsdf_data" U)~?/s{v  
    Print #1, "format angles=deg bsdf=value scale=1" uMl.}t2uYu  
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    'Loop the file list, skip the two header lines and write the remaining data to file J-t5kU;L{  
    Dim lineArray() As String, curLine As Long =h,6/cs  
    For Each curFile In fList fHTqLYd-  
        Print "Merging data from file " & curFile tZlz0BY!  
        ReadFile( cDir & curFile, lineArray ) f/t1@d!  
        For curLine = 2 To UBound(lineArray) <11pk  
            Print #1, lineArray(curLine) va \5  
        Next c,a+u  
    Next qkB)CY7  
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    'Close the output file ~^*IP1.3  
    Close #1 nQ4s  
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    Print "Finished merging RPC data for sample " & sampName 1"J\iwN3  
    Print "FRED formatted data file: " & Chr(9) & outFile N1r
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End Sub '<"eG!O  
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'Utility function to read the contents of a file into an array of strings. ("(:wYR%  
Function ReadFile(ByVal fileName As String, _ Ei!5Qya>  
                  ByRef lineArray() As String) As Long r8\"'4B1  
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    ReadFile = -1 }HB)%C50.  
    Dim oFSO As Object 5~Vra@iab:  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 0{bGVLp  
    Erase lineArray `$j"nP F_  
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    Dim fid As Long =ML6"jr  
    If oFSO.fileexists( fileName ) Then sM)qzO2wh  
        fid = FreeFile() b#%s!  
        Open fileName For Input As fid _,V 9^  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) T_ifDQX;  
        Close fid kfaRN^  
    End If '51DdT
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    Set oFSO = Nothing )rJ{}U:S  
    Return UBound( lineArray ) ax{+7 k  
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End Function My'u('Q%  
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Sub GetFileList( ByVal in_dir As String, _ D 3m4:z  
                 ByRef in_flist() As String ) e(7F| G*  
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    'Redimension the file list array M&P?/Zi=L  
    Erase in_flist RRh0G>*  
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    'Tracks how many files are found vZj:\geV  
    Dim fCount As Long 7{HJjH!zx  
    fCount = 0 h$[}lZDg  
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    'Recurse directory and search for text files ]i'hCa $$  
    Dim f As String \6A-eWIQif  
    f = Dir$(in_dir & "*.txt") H^ _[IkuA%  
    While f <> "" {fXD@lhi  
        ReDim Preserve in_flist(fCount) yRt]i>  
        in_flist(fCount) = f p/jC}[
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        fCount += 1 Pg[XIfBva  
        f = Dir$() gMe)\5`\Y  
    Wend 5B3S]@%  
    ReDim Preserve in_flist(fCount-1) o*OYZ/_L  
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End Sub  ^2-2Jz@  
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