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infotek 2021-10-26 09:58

RPC Photonics扩散片BSDF

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RPC Photonics扩散片BSDF
时间:2016-01-08 23:10来源:讯技光电作者: 技术部点击:次打印
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摘要 =]pcC  
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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。 2qb,bp1$  
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背景 ::\7s  
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 u ~N)^  
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。
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 Zhl}X!:c?\  
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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。 o%+8.Tx6wT  
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) \BT8-}  
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 R "S,&  
例如下所示: $J>J@4  
Sample name:  EDF-C1-56 s2*^ PG  
Merging data from file EDF-C1-56 0-0.txt NR8YVO)5$  
Finished merging RPC data for sample EDF-C1-56 dF$Fd{\4^  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt :V>M{vd  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面
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a. 创建一个新的散射库 o(,u"c/Or  
b. 散射模型命名 /dU-$}>ZI  
c. 改变散射模型为“Tabulated BSDF”. sv<U$M~)X  
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 ) x[Xj[O  
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。 T@PtO "r  
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, RCED K\*m  
g. 点击OK a'f0Wv0%"  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 Ou~|Q&f'  
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脚本代码 FFH9 $>A  
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'#Language "WWB-COM" ,t4g^67R{  
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Option Explicit s6k,'`.  
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Sub Main C wKo'PAJ  
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    'Cleanup 8y!d^EQ  
    ClearOutputWindow() *I0{1cST  
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    Print "Merging RPC Photonics BSDF Data Files" s 2t'jIB  
    SetTextColor(255,0,0) {'W\~GnZ  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." Jsi [,|G  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." H\tz"<*``  
    SetTextColor(0,0,0) }(AgXvRq  
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    'Current directory of this script (should be the same as the text files being merged) ;eznONNF  
    Dim cDir As String [TiOh'  
    cDir = MacroDir$ & "\" k^3|A3A  
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    'Array which will be populated with the list of files to be merged YYDLFt r2  
    Dim fList() As String, curFile As String 30 Vv Zb  
    GetFileList( cDir, fList ) =F2e*?a3  
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    Print "" =/@c9QaV B  
    Print "Files found for merging:" 4&IBNc,sn  
    For Each curFile In fList ' bio: 1  
        Print Chr(9) & curFile OczVObbS  
    Next ^E&':6(  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. eR.ucTji  
    Dim nameArray() As String, sampName As String M IPmsEdBi  
    nameArray = Split(fList(0)," 0-0.txt") Yr@)W~  
    sampName  = nameArray(0) s8T} ah!  
    Print "" CybHr#LBc  
    Print "Sample name: " & Chr(9) & sampName /[YH  W]  
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    'Open an output file and write the FRED header data 9.R)iA  
    Dim outFile As String 7_ g}t!b`  
    outFile = cDir & sampName & "_FRED.txt" \HFeEEKH  
    Open outFile For Output As #1 Q7O8']~n  
    Print #1, "type bsdf_data" _K{hq<g  
    Print #1, "format angles=deg bsdf=value scale=1" *V(TNLIh;  
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    'Loop the file list, skip the two header lines and write the remaining data to file iivuH2/~?[  
    Dim lineArray() As String, curLine As Long T_CYSS|fX  
    For Each curFile In fList $FEG0&  
        Print "Merging data from file " & curFile :(EU\yCzK  
        ReadFile( cDir & curFile, lineArray ) kQXtO)  
        For curLine = 2 To UBound(lineArray) rt] @Z`w  
            Print #1, lineArray(curLine) 7-81,ADv(  
        Next o >bf7+D  
    Next k WYjqv  
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    'Close the output file Wbc*x  
    Close #1 _@0>y MZ^  
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    Print "Finished merging RPC data for sample " & sampName %7q,[g8  
    Print "FRED formatted data file: " & Chr(9) & outFile )`]w\s #  
End Sub {q%&~  
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'Utility function to read the contents of a file into an array of strings. g9OO#C>  
Function ReadFile(ByVal fileName As String, _ ;3NA,JA#Y  
                  ByRef lineArray() As String) As Long #LEK?]y  
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    ReadFile = -1 A<.`HCv2  
    Dim oFSO As Object )6dvWK  
    Set oFSO = CreateObject("Scripting.FileSystemObject") weC$\st:D  
    Erase lineArray :M(%sv</  
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    Dim fid As Long T%K"^4k  
    If oFSO.fileexists( fileName ) Then DPI iGRw  
        fid = FreeFile() O$+J{@  
        Open fileName For Input As fid a2 fV0d6*l  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) L}CjC>R!  
        Close fid GYYk3\r  
    End If 'Uqz,  
    Set oFSO = Nothing "Q]`~u':  
    Return UBound( lineArray ) */ZrZ^?o  
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End Function RajzH2j+>  
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Sub GetFileList( ByVal in_dir As String, _ eZs34${fN  
                 ByRef in_flist() As String ) gS ~QlW V  
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    'Redimension the file list array 09pnM|8A  
    Erase in_flist SN O'*?  
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    'Tracks how many files are found GMRw+z4  
    Dim fCount As Long dN J2pfvv  
    fCount = 0 ~=i9]%g ?  
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    'Recurse directory and search for text files *?%DdVrO@  
    Dim f As String LDHuf<`  
    f = Dir$(in_dir & "*.txt") 7:t+  
    While f <> "" jD9 ^DzFx  
        ReDim Preserve in_flist(fCount) PvX>+y5  
        in_flist(fCount) = f b_@MoL@A!  
        fCount += 1 Lh0Pvq0C  
        f = Dir$() 85YE6^y  
    Wend Mp9wYM*  
    ReDim Preserve in_flist(fCount-1)

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