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infotek 2023-05-11 08:31

RPC Photonics扩散片BSDF

摘要 vy W/f  
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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。
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背景 UO^"<0u  
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。 HRO :U%  
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。 <+D(GH};  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 uP bvN[~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。 Zh.5\&bm  
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图2. RPC Photonics工程漫射体不同类型的散射数据
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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) 5]yQMY\2)  
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 eqD|3YX  
例如下所示: bL\ab  
Sample name:  EDF-C1-56 \{  
Merging data from file EDF-C1-56 0-0.txt In)8AK(Hw  
Finished merging RPC data for sample EDF-C1-56 En$-,8\%  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ; V)pXLE  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Yt79W  
a. 创建一个新的散射库 }$5S@,  
b. 散射模型命名 _jt>%v4}4  
c. 改变散射模型为“Tabulated BSDF”. SwHrHj  
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 ) 1,,kU  
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。 EJ7}h?a]U_  
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, 0<"4W:  
g. 点击OK {xb8H  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 (VeX[*}I  
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脚本代码 =\ ]5C  
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'#Language "WWB-COM" *'D( j#&  
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Option Explicit ?pq#|PI)  
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Sub Main $<R\|_6J  
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    'Cleanup apsR26\^  
    ClearOutputWindow() SSH))zJ  
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    Print "Merging RPC Photonics BSDF Data Files" `)e5pK  
    SetTextColor(255,0,0) eZpyDw C{  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." feg  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ,z A9*  
    SetTextColor(0,0,0) r}>8FE9S'H  
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    'Current directory of this script (should be the same as the text files being merged) Ni]V)wGE;  
    Dim cDir As String r(=  
    cDir = MacroDir$ & "\" 98 dl -?  
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    'Array which will be populated with the list of files to be merged c:QZ(8d]L  
    Dim fList() As String, curFile As String cm`Jr#kl{  
    GetFileList( cDir, fList ) kY d'6+m  
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    Print "" f;os\8JdM  
    Print "Files found for merging:" B",5"'id  
    For Each curFile In fList SM%N ]/@U  
        Print Chr(9) & curFile dw'&Av' |E  
    Next i=Nq`BoQf  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. nymF`0HYe1  
    Dim nameArray() As String, sampName As String ?#N: a  
    nameArray = Split(fList(0)," 0-0.txt") Sg#$ B#g  
    sampName  = nameArray(0) ./SDZ:5/  
    Print "" ]Rah,4?9f  
    Print "Sample name: " & Chr(9) & sampName C(N' +VV_  
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    'Open an output file and write the FRED header data +fh@m h0[  
    Dim outFile As String l|WdJn o  
    outFile = cDir & sampName & "_FRED.txt" |qUi9#NUo  
    Open outFile For Output As #1 wm1`<r^M.  
    Print #1, "type bsdf_data" T!![7Rs  
    Print #1, "format angles=deg bsdf=value scale=1" 7 'T3W c  
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    'Loop the file list, skip the two header lines and write the remaining data to file zVEG ) Hr  
    Dim lineArray() As String, curLine As Long Ag[Zs%X  
    For Each curFile In fList dJvT2s.t[  
        Print "Merging data from file " & curFile ?w^MnK0U)  
        ReadFile( cDir & curFile, lineArray ) 5"~F#vt  
        For curLine = 2 To UBound(lineArray) zG IxmJ.  
            Print #1, lineArray(curLine) aCxF{>n  
        Next RCZ"BxleU  
    Next Ez()W,6]g  
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    'Close the output file !{u`}:\  
    Close #1 dWc'RwL  
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    Print "Finished merging RPC data for sample " & sampName aMU0BS"   
    Print "FRED formatted data file: " & Chr(9) & outFile G5MoIC  
End Sub =()Vrk|uK  
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'Utility function to read the contents of a file into an array of strings. hQWo ]WF(J  
Function ReadFile(ByVal fileName As String, _ Z;v5L/;  
                  ByRef lineArray() As String) As Long KM-d8^\:  
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    ReadFile = -1 ?/@ U#Qy  
    Dim oFSO As Object e\8|6< o[  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Jy^.L$bt  
    Erase lineArray >O;V[H2[  
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    Dim fid As Long Z]~) ->=}  
    If oFSO.fileexists( fileName ) Then 7\0}te  
        fid = FreeFile() p<Oz"6_/~  
        Open fileName For Input As fid OrC}WMhd  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) MpNgp )%>  
        Close fid 2gasH11M  
    End If @PL.7FM<v  
    Set oFSO = Nothing =)c^ik%F&  
    Return UBound( lineArray ) gJ=y7yX  
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End Function (IXUT6|  
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Sub GetFileList( ByVal in_dir As String, _  `1`Qu!  
                 ByRef in_flist() As String ) k_?Z6RE>  
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    'Redimension the file list array wU}%]FqtZ=  
    Erase in_flist 5+DId7d'n  
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    'Tracks how many files are found saa3BuV 6  
    Dim fCount As Long jk\z-hd  
    fCount = 0 ` n#Db  
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    'Recurse directory and search for text files I/B*iW^  
    Dim f As String cM_!_8o  
    f = Dir$(in_dir & "*.txt") #3knKBH  
    While f <> "" Nsf>b8O  
        ReDim Preserve in_flist(fCount) xNd p]u  
        in_flist(fCount) = f gyz_$T@x  
        fCount += 1 y*#YIS56I  
        f = Dir$() ,;@v Vm'}  
    Wend V(5*Dn84  
    ReDim Preserve in_flist(fCount-1) d-cW47  
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End Sub L$z(&%Nx  
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