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infotek 2020-12-15 09:37

RPC Photonics扩散片BSDF

摘要 7O"T `>  
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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 1no$|n#  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术,可以解决其他技术的不足,大大改善了诸如光刻系统、有效固态照明,显示,背光,显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体(Engineered DiffusersTM)的新概念,与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同,工程漫射体要求对于每个散射中心,通常为微透镜单元,都进行控制。例如全息漫射体可以视为一组随机排列的透镜,但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制:而无法单独操控每个微透镜单元,这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面,在工程漫射体中,每个微透镜单元形成漫射体,由其凹形纵断面和在阵列中的位置所确定。同时,为了确保漫射体不受输入光束变化的影响,并且不产生衍射效果,微透镜单元的分布是随机的,根据产生相应的光束形状函数所选取的概率分布函数来确定。因此,工程漫射体同时保留了随机与确定性漫射体的优点,从而实现高性能的光束整形功能。 P^&+ehp  
FRED是美国Photon Engineering 公司开发的光学工程仿真软件,其在杂散光分析中独特的算法、高效的准确性,使其与其它同类产品相比更具优势。本案例我们重点讲述如何由RPC Photonics的BSDF数据转为FRED可识别的散射数据。 ?5Lom#^  
图1. RPC Photonics工程漫射体结构及光束投射形状
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步骤 >R.~'A/$F  
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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。 rJZ-/]Xf!6  
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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) qE(`@G  
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 JlG yGr^MD  
例如下所示: 8B\,*JGY2  
Sample name:  EDF-C1-56 5%+T~ E*  
Merging data from file EDF-C1-56 0-0.txt R(x% <I  
Finished merging RPC data for sample EDF-C1-56 GY0<\-  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt f61~%@fE  
4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 ~|?2<g$gYR  
a. 创建一个新的散射库 6 0QElJ9D  
b. 散射模型命名 mAXTO7  
c. 改变散射模型为“Tabulated BSDF”. VRMlr.T +  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件(如EDF-C1-56_FRED.txt ) Be?mIwc_g  
e. 切换为“Varies w/angle” 选项(假定所有的RPC Photonics datasets 数据有多个测试角度。 RU[{!E  
f. 在底部的对话框中,选择透射散射、反射停并且你需要终止入射光线, q-p4k`]  
g. 点击OK XMuZ 'I  
5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 nj)M$'  
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脚本代码 7!Fu.Ps >  
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'#Language "WWB-COM" .'>r?%a  
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Option Explicit - !7QH'  
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Sub Main %M~Ugv_4v  
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    'Cleanup vO <;Gnh~  
    ClearOutputWindow() bQ_i&t\yzB  
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    Print "Merging RPC Photonics BSDF Data Files" XIf,#9  
    SetTextColor(255,0,0) +Hv%m8'0|  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." vR#A7y @ !  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." Z<xSU?J  
    SetTextColor(0,0,0) )]rGGNF*  
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    'Current directory of this script (should be the same as the text files being merged) {}vW=  
    Dim cDir As String 4AUY8Pxp  
    cDir = MacroDir$ & "\" 4 YI,:  
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    'Array which will be populated with the list of files to be merged )FE'#\  
    Dim fList() As String, curFile As String Xdw%Hw  
    GetFileList( cDir, fList ) kU4Zij-O  
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    Print "" : 8(~{<R  
    Print "Files found for merging:" )Z"7^ i  
    For Each curFile In fList &`t-[5O\  
        Print Chr(9) & curFile -N*g|1rpa  
    Next #P18vK5  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. mn4j#-  
    Dim nameArray() As String, sampName As String <S TwylL  
    nameArray = Split(fList(0)," 0-0.txt") E$*I.i_m  
    sampName  = nameArray(0) {h|3P/?7  
    Print "" G;wv.|\  
    Print "Sample name: " & Chr(9) & sampName NAHQ:$  
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    'Open an output file and write the FRED header data Hm%[d;Z7  
    Dim outFile As String r'w5i1C+  
    outFile = cDir & sampName & "_FRED.txt" />)>~_-3  
    Open outFile For Output As #1 v" y e\ZG  
    Print #1, "type bsdf_data" WY0u9M4  
    Print #1, "format angles=deg bsdf=value scale=1" In:h%4>  
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    'Loop the file list, skip the two header lines and write the remaining data to file .r[J} O"  
    Dim lineArray() As String, curLine As Long {I`B?6K5  
    For Each curFile In fList 7A7K:,c  
        Print "Merging data from file " & curFile 2 R1S>X  
        ReadFile( cDir & curFile, lineArray ) [Zi\L>PHO  
        For curLine = 2 To UBound(lineArray) K.*zqQKlI|  
            Print #1, lineArray(curLine) Xgr|~(^  
        Next st'Y j  
    Next nr-VzF7zu  
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    'Close the output file >/ HC{.k  
    Close #1 5#q ^lL  
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    Print "Finished merging RPC data for sample " & sampName q>!T*BQ  
    Print "FRED formatted data file: " & Chr(9) & outFile P@ 1D  
End Sub f}nGWV%,  
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'Utility function to read the contents of a file into an array of strings. z[ IG+2  
Function ReadFile(ByVal fileName As String, _ 'HPw5 L  
                  ByRef lineArray() As String) As Long iTqv=  
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    ReadFile = -1 ]wdudvS@6r  
    Dim oFSO As Object plb'EP>e  
    Set oFSO = CreateObject("Scripting.FileSystemObject") JI@~FD&  
    Erase lineArray 75I* &Wl  
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    Dim fid As Long tJ2l_M^  
    If oFSO.fileexists( fileName ) Then _mA[^G=gY  
        fid = FreeFile() y)Ip\.KV\  
        Open fileName For Input As fid NM[w=  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) QF!K$?EU[  
        Close fid ft:/-$&H  
    End If + +D(P=4hi  
    Set oFSO = Nothing qd!$nr  
    Return UBound( lineArray ) 3l5q?"$  
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End Function {hZZU8*  
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Sub GetFileList( ByVal in_dir As String, _ P8z+ +h  
                 ByRef in_flist() As String ) D-~HJ  
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    'Redimension the file list array b>Vs5nY!  
    Erase in_flist gaTI:SKzc  
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    'Tracks how many files are found pZ OVD%  
    Dim fCount As Long ~wh8)rm  
    fCount = 0 (O /hu3  
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    'Recurse directory and search for text files z$%ntN#eNA  
    Dim f As String VUagZ 7p  
    f = Dir$(in_dir & "*.txt") cg$7`/U  
    While f <> "" &$< S1  
        ReDim Preserve in_flist(fCount) {3 zq.e{  
        in_flist(fCount) = f *Fp )/Ih  
        fCount += 1 > *vI:MG8  
        f = Dir$() gLd3,$ Ei  
    Wend &eK8v]|"W  
    ReDim Preserve in_flist(fCount-1) kw}J~f2  
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End Sub 6i{W=$ RQ  
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