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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 E/H9#  
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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。 YMw,C:a4  
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背景 d[h=<?E5  
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。 OFo hyy(  
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 J)g +I  
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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。 d*TH$-F!p  
图2. RPC Photonics工程漫射体不同类型的散射数据
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2、 将     http://fred-kb.photonengr.com/wp-content/uploads/sites/2/2015/06/constructRpcScatterFile.frs脚本文件放在步骤1中的文件下。(脚本代码放在了本文的最后) ]fY:+Ru  
3、 打开FRED并运行脚本文件,会输出如下“<SAMPLE>_FRED.txt”格式,<SAMPLE>即为RPC Photonics散射片数据集 7 :\J2$P  
例如下所示: {v!w2p@  
Sample name:  EDF-C1-56 %5L~&W}^"  
Merging data from file EDF-C1-56 0-0.txt R UCUEo63  
Finished merging RPC data for sample EDF-C1-56 lGet)/w;c  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt -wUT@a  
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 tG]W!\C'h  
b. 散射模型命名 xz`0V}dPl  
c. 改变散射模型为“Tabulated BSDF”. #F/W_G7v  
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 ) $m)eO8S+  
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。 #}1yBxB<=  
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, y@}WxSK*0  
g. 点击OK \HD:#a  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 #+i5'p(4  
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脚本代码 JiqhCt\  
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'#Language "WWB-COM" z>W?\[E<2  
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Option Explicit PYCG#U  
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Sub Main "Ml#,kU<T  
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    'Cleanup :S`12*_g"  
    ClearOutputWindow() VaonG]Ues  
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    Print "Merging RPC Photonics BSDF Data Files" "SuG6!k3  
    SetTextColor(255,0,0) ga'G)d3oS  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." .Z`xNp  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." L{ej<0yr  
    SetTextColor(0,0,0) 7#HSe#0J  
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    'Current directory of this script (should be the same as the text files being merged) i1{)\/f3  
    Dim cDir As String OZKZv,  
    cDir = MacroDir$ & "\" 8VpmcGvc3  
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    'Array which will be populated with the list of files to be merged jJ RaY3  
    Dim fList() As String, curFile As String [IyC}lSW^-  
    GetFileList( cDir, fList ) c r18`xU  
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    Print "" [pt U}  
    Print "Files found for merging:" ZP:+'\&J  
    For Each curFile In fList 5rtE/ {A  
        Print Chr(9) & curFile \^cXmyQ<%  
    Next Vo%ikR #  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. v/7^v}[<  
    Dim nameArray() As String, sampName As String C szZr>Z  
    nameArray = Split(fList(0)," 0-0.txt") xgsEe3|  
    sampName  = nameArray(0) &?j\=%  
    Print "" &[ |Z2}  
    Print "Sample name: " & Chr(9) & sampName V\c`O  
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    'Open an output file and write the FRED header data !h^_2IX  
    Dim outFile As String Yi`DRkp]3  
    outFile = cDir & sampName & "_FRED.txt" 9*s:Vff{  
    Open outFile For Output As #1 Qdy/KL1]  
    Print #1, "type bsdf_data" nGDY::nUE  
    Print #1, "format angles=deg bsdf=value scale=1" ] P_yN:~  
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    'Loop the file list, skip the two header lines and write the remaining data to file %4wHiCOg  
    Dim lineArray() As String, curLine As Long I,/E.cRV<  
    For Each curFile In fList +wGvY r  
        Print "Merging data from file " & curFile !%D;H~mQ  
        ReadFile( cDir & curFile, lineArray ) $}H,g}@0  
        For curLine = 2 To UBound(lineArray) Rx@0EPV  
            Print #1, lineArray(curLine) #A~7rH%hi  
        Next JGYJ;j{E]  
    Next !Ks<%; rb  
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    'Close the output file B;<zA' 1  
    Close #1 H=XdgOui  
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    Print "Finished merging RPC data for sample " & sampName HSACaTVK  
    Print "FRED formatted data file: " & Chr(9) & outFile d(vt0  
End Sub 'kJyE9*xU.  
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'Utility function to read the contents of a file into an array of strings. 1_mqPMm  
Function ReadFile(ByVal fileName As String, _ ]0")iY_  
                  ByRef lineArray() As String) As Long 7Xh ;dJAF3  
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    ReadFile = -1 $b )k  
    Dim oFSO As Object i@=(Y~tD`  
    Set oFSO = CreateObject("Scripting.FileSystemObject") rwpH9\GE  
    Erase lineArray z|<?=c2P  
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    Dim fid As Long P(p|NRD@1  
    If oFSO.fileexists( fileName ) Then  ,}^FV~  
        fid = FreeFile() j 9f QV  
        Open fileName For Input As fid 1/=6s5vS}  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) Jb|dpu/e  
        Close fid 5_rx$avm  
    End If k4J Tc2b  
    Set oFSO = Nothing h\|T(597.  
    Return UBound( lineArray ) d-I&--"ju  
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End Function G[zVGqk  
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Sub GetFileList( ByVal in_dir As String, _ b}ODc]3  
                 ByRef in_flist() As String ) %\1W0%w  
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    'Redimension the file list array }n k [WW  
    Erase in_flist T?*f}J  
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    'Tracks how many files are found <SSkCw  
    Dim fCount As Long .6pVt_f0/  
    fCount = 0 v+DXs!O{  
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    'Recurse directory and search for text files =AX"'q  
    Dim f As String S3y(' PeF  
    f = Dir$(in_dir & "*.txt") 3#{Al[jq  
    While f <> "" +o K*5 Y  
        ReDim Preserve in_flist(fCount) {Ok]$0L  
        in_flist(fCount) = f ? RI D4xu!  
        fCount += 1 TV?MB(mN  
        f = Dir$() 8)YDUE%VH  
    Wend "|/Q5 *L  
    ReDim Preserve in_flist(fCount-1)

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