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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 sWnU*Q  
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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 /1lUFL2D  
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。 Gwkp(9d  
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。 89)rss  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 ]Z\.Vx  
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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。 u-. _;  
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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) 9_ GR\\  
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 DFt1{qS8@u  
例如下所示: lU.@! rGbw  
Sample name:  EDF-C1-56 iB5Se  
Merging data from file EDF-C1-56 0-0.txt o3l_&?^  
Finished merging RPC data for sample EDF-C1-56 U.G**v  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 6l>$N?a  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 $9\!CPZ2  
a. 创建一个新的散射库 3say&|kJ  
b. 散射模型命名 Y m|zM1qc  
c. 改变散射模型为“Tabulated BSDF”. T!)v9L  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) a ^b_&}y  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 pRj1b^F5y  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, 8:,l+[\  
g. 点击OK X &6p_Lo  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 ;Z"6ve4  
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脚本代码 ><[($Gq`g  
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'#Language "WWB-COM" ,r{\aW@  
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Option Explicit oxb#{o9G  
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Sub Main r"a0!]n  
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    'Cleanup ;K0kQ<y-Y  
    ClearOutputWindow() 'k#^Z  
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    Print "Merging RPC Photonics BSDF Data Files" J]~LmSh  
    SetTextColor(255,0,0) l =ZhHON  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." )G0a72  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." d:6?miMH]t  
    SetTextColor(0,0,0) 1_!*R]aq  
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    'Current directory of this script (should be the same as the text files being merged) ewSFB< N  
    Dim cDir As String <DCrYt!1}c  
    cDir = MacroDir$ & "\" ~&=-*  
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    'Array which will be populated with the list of files to be merged '@9h@,tc  
    Dim fList() As String, curFile As String ]%3o"|  
    GetFileList( cDir, fList ) _ pM&Ya  
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    Print "" oorit  
    Print "Files found for merging:" 4r`u@  
    For Each curFile In fList CeoK@y=o  
        Print Chr(9) & curFile UHF.R>Ry  
    Next i2A>T/?{  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. kehv85  
    Dim nameArray() As String, sampName As String Zh]d&Xeq  
    nameArray = Split(fList(0)," 0-0.txt") 0#KDvCBJ  
    sampName  = nameArray(0)  qm&}^S  
    Print "" 0F6^[osqtl  
    Print "Sample name: " & Chr(9) & sampName 7^#f<m;Ar!  
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    'Open an output file and write the FRED header data ngj=w;7~+  
    Dim outFile As String M2_sxibI  
    outFile = cDir & sampName & "_FRED.txt" 11}X2j~Ww  
    Open outFile For Output As #1 | Uf6k`  
    Print #1, "type bsdf_data"  8Br*  
    Print #1, "format angles=deg bsdf=value scale=1" 9%j_"+<c  
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    'Loop the file list, skip the two header lines and write the remaining data to file 2?58=i%b  
    Dim lineArray() As String, curLine As Long _?kjIF  
    For Each curFile In fList rlmzbIu I9  
        Print "Merging data from file " & curFile d76k1-m\o  
        ReadFile( cDir & curFile, lineArray ) O7 %<(  
        For curLine = 2 To UBound(lineArray) ;3OQgKI  
            Print #1, lineArray(curLine) M.))UKSF  
        Next ^&buX_nlO  
    Next B> *zQb2:  
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    'Close the output file im|( 4 f  
    Close #1 X:bv ?o>Y  
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    Print "Finished merging RPC data for sample " & sampName MWl?pG!Y  
    Print "FRED formatted data file: " & Chr(9) & outFile ~+}w>jIm{|  
End Sub qZACX.Hw  
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'Utility function to read the contents of a file into an array of strings. e`zx#v  
Function ReadFile(ByVal fileName As String, _ S.1\e"MfI  
                  ByRef lineArray() As String) As Long ?pn<lW8d  
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    ReadFile = -1 N7:=%Fy(  
    Dim oFSO As Object "{1`~pDj?  
    Set oFSO = CreateObject("Scripting.FileSystemObject") r:lv[/ D  
    Erase lineArray jh0``{  
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    Dim fid As Long EjW3_ %  
    If oFSO.fileexists( fileName ) Then <0T5W#H`D  
        fid = FreeFile() )Kkw$aQI"d  
        Open fileName For Input As fid b9Jah  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) iq2)oC_  
        Close fid  al/Mgo  
    End If XG FjqZr`  
    Set oFSO = Nothing ?,uTH 4  
    Return UBound( lineArray ) ([SrIG>X  
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End Function ya7PF~:E-  
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Sub GetFileList( ByVal in_dir As String, _ JLo'=(  
                 ByRef in_flist() As String ) \Jm fQrBQ  
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    'Redimension the file list array ]5| o8.  
    Erase in_flist ^f*}]`S  
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    'Tracks how many files are found !wP |t#Sc9  
    Dim fCount As Long pa4,W!t  
    fCount = 0 X,-QxV=lc)  
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    'Recurse directory and search for text files ZS&>%G  
    Dim f As String ${I$@qq83  
    f = Dir$(in_dir & "*.txt") wMFo8;L  
    While f <> "" Tj5G /H>   
        ReDim Preserve in_flist(fCount) y.,S}7l:  
        in_flist(fCount) = f 4HX qRFUD  
        fCount += 1 CUJP"u>8M  
        f = Dir$() LF o{,%B  
    Wend A8Z2o\+  
    ReDim Preserve in_flist(fCount-1) S}fU2Wi  
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End Sub 5W hR |  
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