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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 2$91+N*w9  
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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 Z:_y,( 1Q  
    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。 S(6ZX>wv:  
    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。 ?q P }=nJ  
    图1. RPC Photonics工程漫射体结构及光束投射形状
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    步骤 GpL#, qYc  
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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。 W<Lrfo&=Y]  
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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) iIFQRnpu;3  
    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 Os{qpR^<I:  
    例如下所示: b5Pn|5AVj  
    Sample name:  EDF-C1-56 lI 1lP 1  
    Merging data from file EDF-C1-56 0-0.txt P `"7m-  
    Finished merging RPC data for sample EDF-C1-56 8;8}Oq  
    FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Q-v[O4 y~  
    4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 )a\h5nQI)  
    a. 创建一个新的散射库 *-_Np u6  
    b. 散射模型命名 &}O!l'  
    c. 改变散射模型为“Tabulated BSDF”. L|LTsRIq  
    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 ) }El_.@'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。 {P&^Erx  
    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 Kcl$|T  
    g. 点击OK N+5 ^h(~  
    5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 16|S 0 )  
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    脚本代码 R6;>RRU_  
    #=(op?]  
    '#Language "WWB-COM" EcIQ20Z_-  
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    Option Explicit "N]o5d   
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    Sub Main d&`j 8O  
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        'Cleanup tHbPd.^  
        ClearOutputWindow() )\vHIXnfJ1  
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        Print "Merging RPC Photonics BSDF Data Files" s.'\&B[  
        SetTextColor(255,0,0) aUK4{F ;  
        Print "Note: Script should be located in the same folder as the BSDF TXT files." e6lOmgHn5  
        Print "Note: Do not run this script multiple times without deleting the output file between executions." zF&UdS3  
        SetTextColor(0,0,0) *GP_ut%  
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        'Current directory of this script (should be the same as the text files being merged) YS~t d+*  
        Dim cDir As String )H)Udhz  
        cDir = MacroDir$ & "\" 'V#ew\  
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        'Array which will be populated with the list of files to be merged RWCS u$  
        Dim fList() As String, curFile As String RH]>>tJ^e  
        GetFileList( cDir, fList ) ~qxXou,J  
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        Print "" W"(`n4hi3  
        Print "Files found for merging:" *`Xx_   
        For Each curFile In fList aLt{X)?  
            Print Chr(9) & curFile ?3TV:fx"X  
        Next Xe;(y "pR  
    '%C.([  
        'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ^alZ\!B8  
        Dim nameArray() As String, sampName As String 3]n@c?lw  
        nameArray = Split(fList(0)," 0-0.txt") orH0M!OtS!  
        sampName  = nameArray(0) K#hYbDm  
        Print "" D1~x  
        Print "Sample name: " & Chr(9) & sampName v9m;vWp  
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        'Open an output file and write the FRED header data ,,%:vK+V  
        Dim outFile As String \&&(ytL  
        outFile = cDir & sampName & "_FRED.txt" M5WtGIV  
        Open outFile For Output As #1 917 0bmr  
        Print #1, "type bsdf_data" -MU.Hu  
        Print #1, "format angles=deg bsdf=value scale=1" 5;8B!%b  
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        'Loop the file list, skip the two header lines and write the remaining data to file RS `9?c:  
        Dim lineArray() As String, curLine As Long "%''k~UD 4  
        For Each curFile In fList ?%/u/*9rj  
            Print "Merging data from file " & curFile UXPegK!  
            ReadFile( cDir & curFile, lineArray ) [ []SkLZHg  
            For curLine = 2 To UBound(lineArray) !{tiTA  
                Print #1, lineArray(curLine) s^YTI\L \  
            Next M#VC3h$  
        Next uk[< 6oxz  
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        'Close the output file bro  
        Close #1 w&yGYHg  
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        Print "Finished merging RPC data for sample " & sampName U5CPkH1  
        Print "FRED formatted data file: " & Chr(9) & outFile {XD/8m(hN|  
    End Sub AXP`,H  
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    'Utility function to read the contents of a file into an array of strings. w zqd g  
    Function ReadFile(ByVal fileName As String, _ ;=+Zw1/g  
                      ByRef lineArray() As String) As Long (s$u_aq 77  
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        ReadFile = -1 .^~l_ LkA  
        Dim oFSO As Object xDGS`U  
        Set oFSO = CreateObject("Scripting.FileSystemObject") n5+S"  
        Erase lineArray 4s~HfxYT  
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        Dim fid As Long PB(  
        If oFSO.fileexists( fileName ) Then p/k<wCm6  
            fid = FreeFile() a,'Ncg  
            Open fileName For Input As fid qwF*(pTHq  
            lineArray = Split(Input(LOF(fid), fid), vbCrLf) l^ 0_> R  
            Close fid yw.~trF&%  
        End If 3p3WDL7  
        Set oFSO = Nothing O5qW*r'  
        Return UBound( lineArray ) ^0~c 7`k`V  
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    End Function y=9Dxst"V  
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    Sub GetFileList( ByVal in_dir As String, _ 9 rTz N  
                     ByRef in_flist() As String ) n^AP"1l8?0  
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        'Redimension the file list array slge+xq\J  
        Erase in_flist -jxWlO  
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        'Tracks how many files are found p:JRQT"A  
        Dim fCount As Long qcTmsMpj  
        fCount = 0 Z .bit_(  
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        'Recurse directory and search for text files ,](v?v.[4  
        Dim f As String "*w)puD  
        f = Dir$(in_dir & "*.txt") ]l=O%Ev  
        While f <> "" \5Vp6^  
            ReDim Preserve in_flist(fCount) BbrT f"`  
            in_flist(fCount) = f fW.GNX8  
            fCount += 1 7|QGY7Tf  
            f = Dir$() \5'O.*pr  
        Wend }dX/Y /  
        ReDim Preserve in_flist(fCount-1) Gefnk!;;  
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    End Sub \E$1lc  
     
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