[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： R,(^fM  
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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。 r J&1
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背景： <ioX|.7ZX  
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。 9F3`hJZRy>  
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。 tZ(Wh  
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步骤
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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。 s4w<X}O_  
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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）  3o/f#y  
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 9t=erhUr  
例如下所示： p_qH7W  
Sample name:  EDF-C1-56 "5{\0CfS  
Merging data from file EDF-C1-56 0-0.txt D4@=+  
Finished merging RPC data for sample EDF-C1-56 `W"-jz5#=  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt -cG?lEh<  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 Um%E/0j  
a. 创建一个新的散射库 n6oVx5/  
b. 散射模型命名 u{J:wb  
c. 改变散射模型为“Tabulated BSDF”. ]t<%v_K  
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 ） DD;PmIW  
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。 ZgN*m\l  
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， B^eea[  
g. 点击OK 5^pQ=Sgt  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 )Y)7p//  
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脚本代码： b%AYYk)d?  
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'#Language "WWB-COM" qD2<-E&M/  
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Option Explicit $U!w#|&  
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Sub Main Ey)ox$  
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    'Cleanup 8amtTM  
    ClearOutputWindow() T_pE'U%[  
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    Print "Merging RPC Photonics BSDF Data Files" ; <3w ,r  
    SetTextColor(255,0,0) KPKby?qQ^  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." WC}mt%H*O  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." p_tMl%K  
    SetTextColor(0,0,0) @Yy
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    'Current directory of this script (should be the same as the text files being merged) b@nbXm]Z  
    Dim cDir As String T-JJc#  
    cDir = MacroDir$ & "\" l~!#<=.  
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    'Array which will be populated with the list of files to be merged ~d28"p.7  
    Dim fList() As String, curFile As String z.#gpTXD  
    GetFileList( cDir, fList ) Bf[D&O  
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    Print "" 4ajBMgD]KG  
    Print "Files found for merging:" <PXA`]x~  
    For Each curFile In fList s|dL.@0,L  
        Print Chr(9) & curFile V.;0F%zks5  
    Next M,|o2'  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. R0{+Xd  
    Dim nameArray() As String, sampName As String Xig%Q~oMp  
    nameArray = Split(fList(0)," 0-0.txt") 0s=GM|y  
    sampName  = nameArray(0) _k _F  
    Print "" 9v0f4Pbxm  
    Print "Sample name: " & Chr(9) & sampName ]oZ$,2#;~  
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    'Open an output file and write the FRED header data R~)c(jj5  
    Dim outFile As String UIbVtJ  
    outFile = cDir & sampName & "_FRED.txt" %/s:G)  
    Open outFile For Output As #1 Ywlym\ [+  
    Print #1, "type bsdf_data" (iH5F9WO  
    Print #1, "format angles=deg bsdf=value scale=1" .GL
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    'Loop the file list, skip the two header lines and write the remaining data to file cYW F)WAog  
    Dim lineArray() As String, curLine As Long C'kd>LAGu  
    For Each curFile In fList dEns|r  
        Print "Merging data from file " & curFile IB(5 &u.  
        ReadFile( cDir & curFile, lineArray ) a!4'}gHR  
        For curLine = 2 To UBound(lineArray) QfRt3\^`  
            Print #1, lineArray(curLine) *T*MLD]Q  
        Next >e"1a/2%>&  
    Next \/lH]u\x  
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    'Close the output file G$Z8k,g+<7  
    Close #1 N!^U{;X7/  
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    Print "Finished merging RPC data for sample " & sampName Qq^>7OU>Co  
    Print "FRED formatted data file: " & Chr(9) & outFile sm/l'e  
End Sub &&TQ0w&T
 
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'Utility function to read the contents of a file into an array of strings. n+j'FfSz  
Function ReadFile(ByVal fileName As String, _ o=4d2V%m  
                  ByRef lineArray() As String) As Long 0|HD(d`a  
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    ReadFile = -1 "P'
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    Dim oFSO As Object .u)Po;e`  
    Set oFSO = CreateObject("Scripting.FileSystemObject") .Mdxbs6.C  
    Erase lineArray :8jHN_u  
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    Dim fid As Long \<a(@#E*~  
    If oFSO.fileexists( fileName ) Then / IAK'/  
        fid = FreeFile() GYyP+7K4l[  
        Open fileName For Input As fid -E?h^J&U  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Z#nj[r!l}  
        Close fid )#M*@e$k  
    End If YjoN:z`b  
    Set oFSO = Nothing jo0p/5;  
    Return UBound( lineArray ) )nTOIfP2  
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End Function 0:Ak4L6k  
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Sub GetFileList( ByVal in_dir As String, _ {pm>F}Cwy  
                 ByRef in_flist() As String ) /DJyNf*  
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    'Redimension the file list array G}AfCd4  
    Erase in_flist cdf8YN0!  
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    'Tracks how many files are found  J$v0  
    Dim fCount As Long aB#qzrr['8  
    fCount = 0 CXb)k.L  
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    'Recurse directory and search for text files f'TdYG  
    Dim f As String b-;+&Rb  
    f = Dir$(in_dir & "*.txt") xW#r)aN]p  
    While f <> "" khyn4   
        ReDim Preserve in_flist(fCount) Y*dzoN.sW  
        in_flist(fCount) = f xmT(yv,  
        fCount += 1 m+s^K{k}  
        f = Dir$() S6`4&0'  
    Wend l{E+j%  
    ReDim Preserve in_flist(fCount-1) }pTy mAN  
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End Sub =pF 6  
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