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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 g$ HL::  
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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 _CPj] m{  
    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。 0$ON`Vsu|  
    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。 @  R[K8  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 8o[gzW:Q)U  
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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。 ZR -RzT1  
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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)  71@kIJI  
    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 sZ~03QvkT  
    例如下所示: L*dGo,oN  
    Sample name:  EDF-C1-56 F53 .g/[  
    Merging data from file EDF-C1-56 0-0.txt !yT=*Cj4  
    Finished merging RPC data for sample EDF-C1-56 tH&eKM4G  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt w&f>VB~,1  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面  S!#5  
    a. 创建一个新的散射库 Op8Gj  `  
    b. 散射模型命名 :!l.ze{F  
    c. 改变散射模型为“Tabulated BSDF”. j94~c YV  
    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 ) ,tQN L\t  
    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。 T59FRX  
    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 5Pq6X  
    g. 点击OK J~xm[^0  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 8\9W:D@"x  
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    脚本代码 eaNfCXHDN  
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    '#Language "WWB-COM" :CezkD&  
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    Option Explicit m>48?%  
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    Sub Main .SmG)5U]  
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        'Cleanup J"< h#@`  
        ClearOutputWindow() ^`M%g2x  
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        Print "Merging RPC Photonics BSDF Data Files" KztQT9kY  
        SetTextColor(255,0,0) O"|d~VQ  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." Mv/ SU">F  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." mXhC-8P  
        SetTextColor(0,0,0) rN7JJHV  
    i;/;zG^=_  
        'Current directory of this script (should be the same as the text files being merged) 4,W,E4 7  
        Dim cDir As String G5OGyQp  
        cDir = MacroDir$ & "\" Z_dL@\#|  
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        'Array which will be populated with the list of files to be merged nj00g>:>  
        Dim fList() As String, curFile As String G9xO>Xp^Al  
        GetFileList( cDir, fList ) %Jd!x{a`>A  
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        Print "" !mWm@ }Ujg  
        Print "Files found for merging:" 4_CL1g  
        For Each curFile In fList 5+Tx01 )  
            Print Chr(9) & curFile A /c  
        Next -qvMMit%7  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. A.7lo  
        Dim nameArray() As String, sampName As String MK! @ND  
        nameArray = Split(fList(0)," 0-0.txt") !2&)6SL/  
        sampName  = nameArray(0)  )h>dD  
        Print "" @].!}tz  
        Print "Sample name: " & Chr(9) & sampName (nBh6u*  
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        'Open an output file and write the FRED header data /pU`-  
        Dim outFile As String #u+qV!4  
        outFile = cDir & sampName & "_FRED.txt" l O*  
        Open outFile For Output As #1 EB}~^ aY  
        Print #1, "type bsdf_data" {[/A?AV;F  
        Print #1, "format angles=deg bsdf=value scale=1" 6@47%%,}  
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        'Loop the file list, skip the two header lines and write the remaining data to file P*%P"g  
        Dim lineArray() As String, curLine As Long ?UIW&*h}  
        For Each curFile In fList q(R|3l^6T  
            Print "Merging data from file " & curFile n) D  
            ReadFile( cDir & curFile, lineArray ) V!yBH<X  
            For curLine = 2 To UBound(lineArray) r}Gku0Hu_E  
                Print #1, lineArray(curLine) car|&b  
            Next o@[o6.B<  
        Next x;} 25A|  
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        'Close the output file |yp^T  
        Close #1 kSCpr0c  
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        Print "Finished merging RPC data for sample " & sampName aTvLQ@MQ  
        Print "FRED formatted data file: " & Chr(9) & outFile ]c|JxgU  
    End Sub 7i02M~*uS  
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    'Utility function to read the contents of a file into an array of strings. {x..> 4  
    Function ReadFile(ByVal fileName As String, _ {-]K!tWda  
                      ByRef lineArray() As String) As Long vgg)f~  
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        ReadFile = -1 EKN<KnU%  
        Dim oFSO As Object [TqX"@4NS  
        Set oFSO = CreateObject("Scripting.FileSystemObject") Nr)DU.f  
        Erase lineArray +<V$G/"  
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        Dim fid As Long K$:btWSm  
        If oFSO.fileexists( fileName ) Then )S`Yl;oL  
            fid = FreeFile() #(a;w  
            Open fileName For Input As fid H<g8u{ $  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0HbCT3g.  
            Close fid T-7( 3#&  
        End If j':<7n/A  
        Set oFSO = Nothing ,qV7$u  
        Return UBound( lineArray ) 6e5A8e8"]  
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    End Function GN5*  
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    Sub GetFileList( ByVal in_dir As String, _ vJ 28A  
                     ByRef in_flist() As String ) qAlX#]  
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        'Redimension the file list array Y[rCF=ZVH  
        Erase in_flist qkC{IBN92  
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        'Tracks how many files are found sdd%u~4,X  
        Dim fCount As Long m?4HVv  
        fCount = 0 c3<H272\  
    ).Iifu|ks  
        'Recurse directory and search for text files KxFA@3  
        Dim f As String LCHw.  
        f = Dir$(in_dir & "*.txt") {D,- Whi  
        While f <> "" #0^a-47PA<  
            ReDim Preserve in_flist(fCount) GFnwj<V+{  
            in_flist(fCount) = f :Z83*SPc  
            fCount += 1 J~ *>pp#U  
            f = Dir$() QMDkkNK  
        Wend (Bpn9}F-V.  
        ReDim Preserve in_flist(fCount-1) )! k l:  
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    End Sub +lf`Dd3  
     
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