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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 <In+V  
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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 ?6:e%YT  
    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。 ~VPE9D@  
    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。 `V?NS,@$  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 .y#>mXm>  
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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。 .L_ Hk  
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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) d ewN\  
    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 8ya|eJ]/L  
    例如下所示: tj tN<y  
    Sample name:  EDF-C1-56 H`T}k+e2-N  
    Merging data from file EDF-C1-56 0-0.txt p$6L_ *$  
    Finished merging RPC data for sample EDF-C1-56 <ceJ!"L  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 7nbaR~ZV  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 eak+8URo  
    a. 创建一个新的散射库 g=S|lVQm  
    b. 散射模型命名 {JW_ZJx  
    c. 改变散射模型为“Tabulated BSDF”. ]?hlpL  
    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 ) byJ[1UK  
    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。 RIF*9=,S  
    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 Qy) -gax:,  
    g. 点击OK R78lV -};Q  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 N!13QI H  
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    脚本代码 V_T~5%9Fy  
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    '#Language "WWB-COM" /Fp@j/50  
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    Option Explicit .WW|v  
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    Sub Main \B8[UZA.&  
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        'Cleanup =M34 HPG  
        ClearOutputWindow() D(M^%z2N  
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        Print "Merging RPC Photonics BSDF Data Files" FdMTc(>  
        SetTextColor(255,0,0) IPlkv{^  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." NQ\<~a`Eq  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." (APGz,^9#  
        SetTextColor(0,0,0) o>\epQt~/p  
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        'Current directory of this script (should be the same as the text files being merged) hu-6V="^9  
        Dim cDir As String O)}5`0@L  
        cDir = MacroDir$ & "\" );V.le}%(  
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        'Array which will be populated with the list of files to be merged Ert` ]s~  
        Dim fList() As String, curFile As String P64< O 5l/  
        GetFileList( cDir, fList ) 6"jV>CNc@  
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        Print "" ')j@OO3  
        Print "Files found for merging:" Q E*`#r#e  
        For Each curFile In fList . AX6xc6  
            Print Chr(9) & curFile  76EMS?e  
        Next -2*Pm1\Z  
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        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. >/DlxYG?  
        Dim nameArray() As String, sampName As String }%k 3  
        nameArray = Split(fList(0)," 0-0.txt") 0 I[3%Q{  
        sampName  = nameArray(0) -Deqlaf(  
        Print "" O.OSLezTQ  
        Print "Sample name: " & Chr(9) & sampName Y f;Slps  
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        'Open an output file and write the FRED header data IHNl`\Le  
        Dim outFile As String O `a4 ")R  
        outFile = cDir & sampName & "_FRED.txt" +:m'  
        Open outFile For Output As #1 X##hSGQM  
        Print #1, "type bsdf_data" UWq[K&vQZ  
        Print #1, "format angles=deg bsdf=value scale=1" _w49@9?  
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        'Loop the file list, skip the two header lines and write the remaining data to file G^_fbrZjN  
        Dim lineArray() As String, curLine As Long DbvKpM H  
        For Each curFile In fList f;%\4TH?  
            Print "Merging data from file " & curFile [V.#w|n  
            ReadFile( cDir & curFile, lineArray ) y4N=v{EbL  
            For curLine = 2 To UBound(lineArray) !;;WS~no3  
                Print #1, lineArray(curLine) :/FT>UCL  
            Next ;Fm7!@u^0  
        Next ^`oyf{w@  
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        'Close the output file by0M(h  
        Close #1 0?8{q{ o+  
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        Print "Finished merging RPC data for sample " & sampName t5jZ8&M5]  
        Print "FRED formatted data file: " & Chr(9) & outFile 8K0@*0  
    End Sub 0|@* `-:VO  
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    'Utility function to read the contents of a file into an array of strings. N?krlR  
    Function ReadFile(ByVal fileName As String, _ sc &S0K  
                      ByRef lineArray() As String) As Long 8!u8ZvbFG  
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        ReadFile = -1  w#\*{EN  
        Dim oFSO As Object z\ ?cazQ  
        Set oFSO = CreateObject("Scripting.FileSystemObject") T_*R^Ukb5  
        Erase lineArray \*k}RKDwT  
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        Dim fid As Long 0*}%v:uN9  
        If oFSO.fileexists( fileName ) Then *&lNzz5&  
            fid = FreeFile() LHJjPf)F  
            Open fileName For Input As fid [agp06 $D?  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) Q,z^eMk'd:  
            Close fid a}MSA/K(  
        End If cq \()uF'c  
        Set oFSO = Nothing o>}fKg<  
        Return UBound( lineArray ) ;;g'C*_  
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    End Function Z 7s (g]  
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    Sub GetFileList( ByVal in_dir As String, _ UN6Du\)]d  
                     ByRef in_flist() As String ) a+Z95~*sZ"  
    'CSIC8M<j  
        'Redimension the file list array j[<}l&  
        Erase in_flist P(#by{s  
    N]6M4j!  
        'Tracks how many files are found OfSHZ;,  
        Dim fCount As Long !R.*Vn[  
        fCount = 0 k9pOY]_Y  
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        'Recurse directory and search for text files wa*/Am9;~  
        Dim f As String HKZD*E((  
        f = Dir$(in_dir & "*.txt") amY\1quD|  
        While f <> "" OPsg3pW!]  
            ReDim Preserve in_flist(fCount) kxp, ZP  
            in_flist(fCount) = f {Ex*8sU%p%  
            fCount += 1 43 h0i-%1  
            f = Dir$() b7_uT`<  
        Wend $<(FZb=  
        ReDim Preserve in_flist(fCount-1) 1JI\e6]I  
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    End Sub &58+-jzW  
     
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