[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： V =aoB Z  
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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。 ?M-8Fp3 +  
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背景： O-lh\9{'R  
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。 x(zZqOed  
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。 a={qA4N  
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步骤 ftU5A@(T  
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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。 ^RAFmM#F  
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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） cASHgm  
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 Hh;6B!zb+  
例如下所示： {BCj
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Sample name:  EDF-C1-56 =egi?Ne  
Merging data from file EDF-C1-56 0-0.txt jsaCnm>
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Finished merging RPC data for sample EDF-C1-56 ZpctsCz]  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 10 H!  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 OHnjI>/  
a. 创建一个新的散射库 $(L7/
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b. 散射模型命名 N&h!14]{Z  
c. 改变散射模型为“Tabulated BSDF”. Ib8{+j  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） "jc)N46  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 sK/"  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， D=sc41]  
g. 点击OK Z:$b)+2:\  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 9x{prCr  
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脚本代码： A y[L{!)2{  
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'#Language "WWB-COM" _:p_#3s$  
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Option Explicit LhRe?U\  
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Sub Main R,+(JgJ  
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    'Cleanup c+/C7C o  
    ClearOutputWindow() YY~=h5$  
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    Print "Merging RPC Photonics BSDF Data Files" rg/vxTl  
    SetTextColor(255,0,0) Y(Ezw !a  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." YmjS!H  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." :=eUNH  
    SetTextColor(0,0,0) J\D3fh97-  
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    'Current directory of this script (should be the same as the text files being merged) :Rj,'uH+h)  
    Dim cDir As String 1ZFSz{  
    cDir = MacroDir$ & "\" ea>\.D-S  
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    'Array which will be populated with the list of files to be merged mxA )r5sx  
    Dim fList() As String, curFile As String 0w. _}Cz  
    GetFileList( cDir, fList ) wu&7#![,  
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    Print "" wT yM9wz&  
    Print "Files found for merging:" JW'acD  
    For Each curFile In fList a\_,_psK  
        Print Chr(9) & curFile lFY8^#@  
    Next j1+Y=@MA  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. }
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    Dim nameArray() As String, sampName As String Yb{t!KL  
    nameArray = Split(fList(0)," 0-0.txt") Hvo27THLo  
    sampName  = nameArray(0) &:K?-ac  
    Print "" _u2  
    Print "Sample name: " & Chr(9) & sampName $Xc<K
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    'Open an output file and write the FRED header data toJ&$HrE  
    Dim outFile As String KZfRiCZ  
    outFile = cDir & sampName & "_FRED.txt" 5K~6`  
    Open outFile For Output As #1 .Kwl8xRg  
    Print #1, "type bsdf_data" *G41%uz  
    Print #1, "format angles=deg bsdf=value scale=1" ZS_f',kE  
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    'Loop the file list, skip the two header lines and write the remaining data to file 8:fiO|~%  
    Dim lineArray() As String, curLine As Long SH|$Dg  
    For Each curFile In fList UOOme)\>  
        Print "Merging data from file " & curFile zAUfd[g  
        ReadFile( cDir & curFile, lineArray )
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        For curLine = 2 To UBound(lineArray) oH"N>@Vl  
            Print #1, lineArray(curLine) {2@96o2}  
        Next \9QOrjiw  
    Next *$D-6}Oay  
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    'Close the output file zUqDX{I8  
    Close #1 ht9b=1wd%s  
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    Print "Finished merging RPC data for sample " & sampName P$I\)Q H  
    Print "FRED formatted data file: " & Chr(9) & outFile G].KJ5,y  
End Sub ;D:T ^4  
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'Utility function to read the contents of a file into an array of strings. nVzo=+Yp  
Function ReadFile(ByVal fileName As String, _ PM7/fv*,  
                  ByRef lineArray() As String) As Long UXHFti/A<  
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    ReadFile = -1 sKO ;p  
    Dim oFSO As Object e,8-P-h~T  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Q,`kfxA`O  
    Erase lineArray _@
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    Dim fid As Long 9#!tzDOtD  
    If oFSO.fileexists( fileName ) Then 9<S-b |!@  
        fid = FreeFile() +)SX  
        Open fileName For Input As fid }}_l@5  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) [dMxr9M  
        Close fid &=bI3-  
    End If [_n|n"M  
    Set oFSO = Nothing n TG|Isa  
    Return UBound( lineArray ) MzD0F#Y  
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End Function pdSyx>rJ  
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Sub GetFileList( ByVal in_dir As String, _ e$=|-Jz  
                 ByRef in_flist() As String ) LKcrr
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    'Redimension the file list array g\'sGt3O  
    Erase in_flist BL67sva;  
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    'Tracks how many files are found x}d\%*B  
    Dim fCount As Long RMK U5A7  
    fCount = 0 9"S3AEI  
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    'Recurse directory and search for text files .Ko`DH~!,C  
    Dim f As String hM}2++V  
    f = Dir$(in_dir & "*.txt") uk,f}Xc  
    While f <> "" M_K&x-H0  
        ReDim Preserve in_flist(fCount) G<'S  
        in_flist(fCount) = f 7f>n`nq?  
        fCount += 1  >pKI'  
        f = Dir$() zYgLGwi{  
    Wend kWFR(J&R  
    ReDim Preserve in_flist(fCount-1) z61 o6mb  
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End Sub |4vk@0L