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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 M9~'dS'XI  
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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 ! z5c+JqN  
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。 P~x4h{~Gd  
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。 x1Gc|K/-  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 fmLDufx  
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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。 ).Iifu|ks  
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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) 0dD.xuor  
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 fNyXDCl  
例如下所示: {D,- Whi  
Sample name:  EDF-C1-56 W~l.feW$i  
Merging data from file EDF-C1-56 0-0.txt 2<AQ{ c  
Finished merging RPC data for sample EDF-C1-56 ?01ru5ys/o  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ~0Zy$L/D  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 :Z83*SPc  
a. 创建一个新的散射库  91fZ r  
b. 散射模型命名 v!n|X7  
c. 改变散射模型为“Tabulated BSDF”. c% ?@3d  
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 ) s~5rP:  
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。 1n.F`%YG  
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, ^0I"  
g. 点击OK 7MKZ*f@x;  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 6]HMhv  
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脚本代码 DoICf1  
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'#Language "WWB-COM" jG#e% `'  
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Option Explicit 8ddBQfCY  
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Sub Main #nj;F'O](  
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    'Cleanup md/h\o&  
    ClearOutputWindow() VY=YI}E  
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    Print "Merging RPC Photonics BSDF Data Files" T w1&<S  
    SetTextColor(255,0,0) UzV78^:,iD  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." G) 37?A)  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." X&M04  
    SetTextColor(0,0,0) q$<VLrx  
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    'Current directory of this script (should be the same as the text files being merged) YYe=E,q  
    Dim cDir As String R|*Eg,1g -  
    cDir = MacroDir$ & "\" =&: |a$C  
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    'Array which will be populated with the list of files to be merged @)ls+}=Y  
    Dim fList() As String, curFile As String og4mLoLA  
    GetFileList( cDir, fList ) fzN?X=  
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    Print "" A":cS }Ui  
    Print "Files found for merging:" emT/H 95|,  
    For Each curFile In fList >``  
        Print Chr(9) & curFile d^5x@E_Td  
    Next m,rkKhXP  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. d-H03F@N  
    Dim nameArray() As String, sampName As String >YcaFnY  
    nameArray = Split(fList(0)," 0-0.txt") m:9|5W  
    sampName  = nameArray(0) Y7')~C`up^  
    Print "" Xhpcu1nA  
    Print "Sample name: " & Chr(9) & sampName AU8sU?=  
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    'Open an output file and write the FRED header data wF*9%K'E  
    Dim outFile As String UhU"[^YO  
    outFile = cDir & sampName & "_FRED.txt" |Rm_8n%m  
    Open outFile For Output As #1 {_Fh3gjb/  
    Print #1, "type bsdf_data" o"p['m*g  
    Print #1, "format angles=deg bsdf=value scale=1" py wc~dWvz  
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    'Loop the file list, skip the two header lines and write the remaining data to file J(9{P/  
    Dim lineArray() As String, curLine As Long /1xBZf rN  
    For Each curFile In fList E!=Iz5  
        Print "Merging data from file " & curFile R I:kp.V  
        ReadFile( cDir & curFile, lineArray ) Q$Sp'  
        For curLine = 2 To UBound(lineArray) G4\|bwh  
            Print #1, lineArray(curLine) 5>VX]nE3!  
        Next E<@N4%K_Q  
    Next Q5Epq sKyC  
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    'Close the output file /^WOrMR  
    Close #1 qCF&o7*oN  
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    Print "Finished merging RPC data for sample " & sampName {f;DhB-jj  
    Print "FRED formatted data file: " & Chr(9) & outFile RW<4",  
End Sub UMK9[Iy$<M  
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'Utility function to read the contents of a file into an array of strings. PlwM3lrj  
Function ReadFile(ByVal fileName As String, _ i*T -9IP  
                  ByRef lineArray() As String) As Long 60WlC0Y~u  
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    ReadFile = -1 [i_evsUj?  
    Dim oFSO As Object Th$xk9TK^@  
    Set oFSO = CreateObject("Scripting.FileSystemObject") n|B<rx?v  
    Erase lineArray .dwbJT  
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    Dim fid As Long G7r.Jm^q  
    If oFSO.fileexists( fileName ) Then $Xqc'4YOZ  
        fid = FreeFile() h\+8eeIl  
        Open fileName For Input As fid C* 0Z F  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) S#Tu/2<}  
        Close fid |<uBJ-5  
    End If 9ZuKED  
    Set oFSO = Nothing 3r[ s_Y*  
    Return UBound( lineArray ) z|zEsDh;  
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End Function (B03f$8}*_  
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Sub GetFileList( ByVal in_dir As String, _ U U#tm  
                 ByRef in_flist() As String ) sH]T1z  
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    'Redimension the file list array C u1G8t-  
    Erase in_flist FRXaPod  
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    'Tracks how many files are found D$E#:[  
    Dim fCount As Long Zqb*-1Qw"*  
    fCount = 0 OLoo#HW  
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    'Recurse directory and search for text files $9u:Ox 2  
    Dim f As String +{#Z^y6&  
    f = Dir$(in_dir & "*.txt") *w/N>:V0p  
    While f <> "" >~tx8aI{  
        ReDim Preserve in_flist(fCount) j]aIJbi  
        in_flist(fCount) = f at1 oxmy  
        fCount += 1 b~(S;1NS'  
        f = Dir$() RLcC>Z  
    Wend 4JXJ0T ar  
    ReDim Preserve in_flist(fCount-1) fUPYCw6F  
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End Sub b`f6(6  
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