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    [技术]RPC Photonics扩散片BSDF [复制链接]

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    只看楼主 倒序阅读 楼主  发表于: 2023-05-11
    摘要 q=Q5s?sQc  
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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 PG+ICg  
    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。 mQ:lj$Gf  
    FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 u6$fF=  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 aU4v-9@U8  
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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。 XSkx<"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) 2 <y!3OeN  
    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 2aNCcZw0  
    例如下所示: %lF}!  
    Sample name:  EDF-C1-56  :RBp  
    Merging data from file EDF-C1-56 0-0.txt 9|jk=`4UK  
    Finished merging RPC data for sample EDF-C1-56 * _)xlpy  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt +vY8HQ|v  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 /4}{SE  
    a. 创建一个新的散射库 A (S=  
    b. 散射模型命名 URz$hcI8  
    c. 改变散射模型为“Tabulated BSDF”. tF}Vs}  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ?ey!wcv~  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 @zSI@Oq_  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 vN=e1\  
    g. 点击OK cy%JJ)sf  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 =87.6Ai  
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    脚本代码 bL v_<\:m  
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    '#Language "WWB-COM" 5Arx"=c  
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    Option Explicit U>PF#@ C/  
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    Sub Main f4eLnY  
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        'Cleanup 8#b>4 Dx  
        ClearOutputWindow() 7UM!<@9\  
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        Print "Merging RPC Photonics BSDF Data Files" ?ra6Lo  
        SetTextColor(255,0,0) "9mJ$us  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." 2O}UVp>  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." H%2Y8}  
        SetTextColor(0,0,0) N4y$$.uv2  
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        'Current directory of this script (should be the same as the text files being merged) CtItzp  
        Dim cDir As String pI*/ - !I  
        cDir = MacroDir$ & "\" NgH"jg-  
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        'Array which will be populated with the list of files to be merged ,jVj9m  
        Dim fList() As String, curFile As String _c| aRRW  
        GetFileList( cDir, fList ) J<8~w; i  
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        Print "" )<W6cDx'H+  
        Print "Files found for merging:" r2,AZ+4FP  
        For Each curFile In fList 5G-)>  
            Print Chr(9) & curFile X2ShxD|  
        Next &Uqm3z?v  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. MN|8(f5Gs  
        Dim nameArray() As String, sampName As String $'M:H_T  
        nameArray = Split(fList(0)," 0-0.txt") Id->F0x0  
        sampName  = nameArray(0) %DJxUuh  
        Print "" 6fxf|R\  
        Print "Sample name: " & Chr(9) & sampName E2f9J{ Ki=  
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        'Open an output file and write the FRED header data Mk-C&#'  
        Dim outFile As String G(piq4D  
        outFile = cDir & sampName & "_FRED.txt" {eR,a-D!7  
        Open outFile For Output As #1 ;dq AmBG{8  
        Print #1, "type bsdf_data" RU`m|<  
        Print #1, "format angles=deg bsdf=value scale=1" Umwd <o  
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        'Loop the file list, skip the two header lines and write the remaining data to file 0q%=Vs~@g  
        Dim lineArray() As String, curLine As Long eit>4xMu  
        For Each curFile In fList wA`A+Z2*?  
            Print "Merging data from file " & curFile eZ~^Z8F[6  
            ReadFile( cDir & curFile, lineArray ) Q7PqN1jTE  
            For curLine = 2 To UBound(lineArray) gd9ZlHo'Id  
                Print #1, lineArray(curLine) maANxSzi  
            Next 22?9KZ`Z=  
        Next h[d|y_)f  
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        'Close the output file Q"]C" ?  
        Close #1 fT.5@RR7^  
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        Print "Finished merging RPC data for sample " & sampName 5gq3 >qo  
        Print "FRED formatted data file: " & Chr(9) & outFile z41 p $  
    End Sub |N[SCk>Kj  
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    'Utility function to read the contents of a file into an array of strings. Rk fr4  
    Function ReadFile(ByVal fileName As String, _ XQ:HH 8  
                      ByRef lineArray() As String) As Long wxPg*R+t  
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        ReadFile = -1 Y=/3_[G   
        Dim oFSO As Object n15c1=gs  
        Set oFSO = CreateObject("Scripting.FileSystemObject") 6m21Y8N  
        Erase lineArray nM8aC&Rd\  
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        Dim fid As Long Q>}I@eyJ  
        If oFSO.fileexists( fileName ) Then ;3'}(_n  
            fid = FreeFile() iZ[o2Tre  
            Open fileName For Input As fid +u _mT$|T  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) R4}G@&Q  
            Close fid @N.W#<IG  
        End If 7 pg8kq@  
        Set oFSO = Nothing LnZz=  
        Return UBound( lineArray ) 0*:]eM};P  
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    End Function -$WiB  
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    Sub GetFileList( ByVal in_dir As String, _ IG +nrTY0  
                     ByRef in_flist() As String ) UDyvTfh1X  
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        'Redimension the file list array f{ S)wE>;  
        Erase in_flist P9`i6H'~  
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        'Tracks how many files are found jy@}$g{  
        Dim fCount As Long KU33P>a"[k  
        fCount = 0 :g<dwuVO  
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        'Recurse directory and search for text files 0?,EteR  
        Dim f As String W,Dr2$V  
        f = Dir$(in_dir & "*.txt") WlZ[9,:p1  
        While f <> "" !c1 E  
            ReDim Preserve in_flist(fCount) k~=-o>}C  
            in_flist(fCount) = f %q>gwq A  
            fCount += 1 @gX@mT"  
            f = Dir$() Mm.!$uR  
        Wend z eIBB  
        ReDim Preserve in_flist(fCount-1) i-E&Y*\^9H  
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    End Sub d G:=tf&1R  
     
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