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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 {lw ec"{  
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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 _\]UA?0  
    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。 O4URr  
    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。 N.J:Qn`(  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 )2\a5iH  
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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。 wIPDeC4  
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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) DvKMb-*S  
    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 ba.OjK@  
    例如下所示: o W [-?  
    Sample name:  EDF-C1-56 N* QI>kzU  
    Merging data from file EDF-C1-56 0-0.txt ;0WlvKF  
    Finished merging RPC data for sample EDF-C1-56 J#^M   
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt B W1O1zIh\  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 #-8/|_*  
    a. 创建一个新的散射库 riQ?'!a7  
    b. 散射模型命名 ![Y$[l  
    c. 改变散射模型为“Tabulated BSDF”. wjs7K|PK  
    d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) ~'Hwszp b  
    e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 cwM0Z6  
    f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线 4cL=f  
    g. 点击OK 34:=A0z  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 d DTt_B  
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    脚本代码 U^S0H(>  
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    '#Language "WWB-COM" P#]jPW  
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    Option Explicit -A~<IyPt  
    -. G0k*[d  
    Sub Main gqamGLK  
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        'Cleanup }s9J+m  
        ClearOutputWindow()  #Ki@=*  
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        Print "Merging RPC Photonics BSDF Data Files" e!y t<[ph  
        SetTextColor(255,0,0) xC]/i(+bA  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." :JmNy <  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." o@-cT`HP  
        SetTextColor(0,0,0) 0o`o'ZV=c  
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        'Current directory of this script (should be the same as the text files being merged) #:X :~T  
        Dim cDir As String :8FH{sqR  
        cDir = MacroDir$ & "\" nDfDpP&  
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        'Array which will be populated with the list of files to be merged ]](hwj  
        Dim fList() As String, curFile As String J=Z"sU=  
        GetFileList( cDir, fList ) 3FfS+q*3S  
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        Print "" Z(cgI5Pu  
        Print "Files found for merging:" 7Udr~ 0_)  
        For Each curFile In fList %vI]"a@  
            Print Chr(9) & curFile lH 8?IkK,g  
        Next 0n%`Xb0q  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 78kk"9h'  
        Dim nameArray() As String, sampName As String aE}u5L$#  
        nameArray = Split(fList(0)," 0-0.txt") i@6 kI C  
        sampName  = nameArray(0) E6uIp^E  
        Print "" Zv_<*uzKZ  
        Print "Sample name: " & Chr(9) & sampName u=5^xpI<D  
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        'Open an output file and write the FRED header data I[/u5V_b'  
        Dim outFile As String @W8RAS~  
        outFile = cDir & sampName & "_FRED.txt" kE1u-EA  
        Open outFile For Output As #1  _~r>C  
        Print #1, "type bsdf_data" q0o6%c:gW  
        Print #1, "format angles=deg bsdf=value scale=1" *@< jJP4  
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        'Loop the file list, skip the two header lines and write the remaining data to file V*)gJg  
        Dim lineArray() As String, curLine As Long _?8T'?-1  
        For Each curFile In fList UaB!,vs3st  
            Print "Merging data from file " & curFile U-(d~]$  
            ReadFile( cDir & curFile, lineArray ) %NuS!v>  
            For curLine = 2 To UBound(lineArray) is,_r(S  
                Print #1, lineArray(curLine) Xg"=,j2  
            Next 2X:n75()  
        Next t_3XqjuA  
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        'Close the output file 2KU [Yd  
        Close #1 ZCa?uzeo]  
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        Print "Finished merging RPC data for sample " & sampName '<O& :  
        Print "FRED formatted data file: " & Chr(9) & outFile @jfd.? RK!  
    End Sub 9 HuE'(wQ  
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    'Utility function to read the contents of a file into an array of strings. S;= D/)[mr  
    Function ReadFile(ByVal fileName As String, _ tkA '_dcIC  
                      ByRef lineArray() As String) As Long hP #>`)aNY  
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        ReadFile = -1 #R &F  
        Dim oFSO As Object +=*ZH `qX  
        Set oFSO = CreateObject("Scripting.FileSystemObject") z5?xmffB  
        Erase lineArray N. uw2Y%  
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        Dim fid As Long \JX8`]|&  
        If oFSO.fileexists( fileName ) Then 75a3H`  
            fid = FreeFile() 6g)21Mh#  
            Open fileName For Input As fid 1L3L!@  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) s i C/k*  
            Close fid  RszqDm  
        End If ZT!DTb B  
        Set oFSO = Nothing HyB!8M|  
        Return UBound( lineArray ) YS &3+Tp  
    ~"8b\oLW  
    End Function J?V8uEly  
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    Sub GetFileList( ByVal in_dir As String, _ ~R3@GaL1  
                     ByRef in_flist() As String ) 94A re<  
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        'Redimension the file list array ~ujY+ {  
        Erase in_flist X ZfT;!wF&  
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        'Tracks how many files are found /K1YDq<=  
        Dim fCount As Long ZPHB$]ri  
        fCount = 0 )jvYJ9s  
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        'Recurse directory and search for text files )D Y?Y-n  
        Dim f As String yy@g=<okt\  
        f = Dir$(in_dir & "*.txt") yqZKn=1:  
        While f <> "" V|Smk;G  
            ReDim Preserve in_flist(fCount) dG\dGSZ\h  
            in_flist(fCount) = f !CUrpr/*  
            fCount += 1 &G:#7HX@-  
            f = Dir$() YFeF(k!!n  
        Wend w\!aKeP'  
        ReDim Preserve in_flist(fCount-1) rz5AIe>Hm  
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    End Sub N"Q-xK  
     
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