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infotek 2021-10-26 09:58

RPC Photonics扩散片BSDF

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RPC Photonics扩散片BSDF
时间:2016-01-08 23:10来源:讯技光电作者: 技术部点击:次打印
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摘要 _]g?3Gw7!  
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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。 %TOYU (k  
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背景 Y|NL #F  
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。 @' V=Vr  
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。
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 dZS v=UY)  
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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。 7RH1,k  
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) yA74Rxl*6  
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 &mG1V  
例如下所示: XOk0_[  
Sample name:  EDF-C1-56 G4VdJ(_  
Merging data from file EDF-C1-56 0-0.txt }ZP;kM$g  
Finished merging RPC data for sample EDF-C1-56 BqF%2{  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt '+@q  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面
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a. 创建一个新的散射库 zvzS$Gpe  
b. 散射模型命名 k7R8Q~4  
c. 改变散射模型为“Tabulated BSDF”. @|N'V"*MT  
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 ) R:Pw@  
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。 Y? 1 3_~ K  
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,  k|Xxr  
g. 点击OK r)9&'m.:  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 +{qX,  
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脚本代码 PT`];C(he  
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'#Language "WWB-COM" p "J^  
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Option Explicit x]1G u  
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Sub Main nBVR)|+M  
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    'Cleanup pl-2O $  
    ClearOutputWindow() mnZS](>  
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    Print "Merging RPC Photonics BSDF Data Files" y<53xZi  
    SetTextColor(255,0,0) HQpw2bdy  
    Print "Note: Script should be located in the same folder as the BSDF TXT files."  AU3Ou5  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ` |L l  
    SetTextColor(0,0,0) cz2guUu  
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    'Current directory of this script (should be the same as the text files being merged) Usa  
    Dim cDir As String ftL>oOz[  
    cDir = MacroDir$ & "\" BW`)q/  
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    'Array which will be populated with the list of files to be merged rh8.kW-K_  
    Dim fList() As String, curFile As String JTK0#+?  
    GetFileList( cDir, fList ) SGZ]_  
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    Print "" fn!(cE|`E  
    Print "Files found for merging:" 0+i\j`O&  
    For Each curFile In fList |L@9qwF  
        Print Chr(9) & curFile wR x5` @  
    Next j:JM v  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. `I\)Kk@*b9  
    Dim nameArray() As String, sampName As String *=6,}rX"I  
    nameArray = Split(fList(0)," 0-0.txt") .7BB*!CP  
    sampName  = nameArray(0) OG M9e!  
    Print "" Cb{n4xKW6  
    Print "Sample name: " & Chr(9) & sampName O_f+#K)  
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    'Open an output file and write the FRED header data :3FJe  
    Dim outFile As String f;Iaf#V_  
    outFile = cDir & sampName & "_FRED.txt" FUq>+U!Qu  
    Open outFile For Output As #1 v,\2$q/  
    Print #1, "type bsdf_data" DeMF<)#  
    Print #1, "format angles=deg bsdf=value scale=1" g_2m["6*  
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    'Loop the file list, skip the two header lines and write the remaining data to file 1j_x51p  
    Dim lineArray() As String, curLine As Long !A.Kb74  
    For Each curFile In fList |bHId!d  
        Print "Merging data from file " & curFile # j=r  
        ReadFile( cDir & curFile, lineArray ) aCL_cVOMR  
        For curLine = 2 To UBound(lineArray) 208dr*6U  
            Print #1, lineArray(curLine) :%#(<@{  
        Next .szs?  
    Next l c<&f  
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    'Close the output file 80/6-_g(  
    Close #1 5`ma#_zk|f  
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    Print "Finished merging RPC data for sample " & sampName o9tvf|+z  
    Print "FRED formatted data file: " & Chr(9) & outFile aS7[s6  
End Sub " <GDOL  
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'Utility function to read the contents of a file into an array of strings. bt$+l[U^J  
Function ReadFile(ByVal fileName As String, _ STC'j1U  
                  ByRef lineArray() As String) As Long _` %z  
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    ReadFile = -1 ?c vXuxCm  
    Dim oFSO As Object .ZK|%VGW  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 9$9Pv%F:j  
    Erase lineArray ;'o:1{Y  
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    Dim fid As Long @ =RH_NB  
    If oFSO.fileexists( fileName ) Then wYf9&}k\4  
        fid = FreeFile() YWf w%p?n"  
        Open fileName For Input As fid IZ2c<B5&  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) QE:%uT  
        Close fid `.0QY<;  
    End If t/6t{*-w  
    Set oFSO = Nothing n9J.]+@J  
    Return UBound( lineArray ) Z/z(P8#U\  
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End Function ~%6GF57gC  
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Sub GetFileList( ByVal in_dir As String, _ hL\gI(B  
                 ByRef in_flist() As String ) QfI)+pf  
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    'Redimension the file list array VfJbexYT  
    Erase in_flist 0n <t/74  
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    'Tracks how many files are found erG;M!9\  
    Dim fCount As Long zh hH A9  
    fCount = 0 cuJ%;q=;  
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    'Recurse directory and search for text files 0NY2Kw;  
    Dim f As String _084GK9{W  
    f = Dir$(in_dir & "*.txt") 3^>D |  
    While f <> "" &Rgy/1  
        ReDim Preserve in_flist(fCount) 4{d`-reHg  
        in_flist(fCount) = f B}= WxG|)  
        fCount += 1 y;N[#hY#CD  
        f = Dir$() !aSu;Ln  
    Wend LL~bq(b  
    ReDim Preserve in_flist(fCount-1)

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