[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： A T'P=)F@  
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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。 CiSl0  
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背景： .&Ok53]b  
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。 zr5(nAl  
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。 KGoHn6jM  
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步骤 |ZnRr  
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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。 x3++JG  
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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） /P3s.-sL  
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 @lnM%  
例如下所示： ?dcR!-3  
Sample name:  EDF-C1-56 `bF]
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Merging data from file EDF-C1-56 0-0.txt >&3ATH;&(  
Finished merging RPC data for sample EDF-C1-56 $=-Q]ld&]  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt ^,M&PP6  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 /NDuAjp[@  
a. 创建一个新的散射库 \"u3x.!  
b. 散射模型命名 q T pvz  
c. 改变散射模型为“Tabulated BSDF”. 4fCg{  
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 ） ef;Ta|#  
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。 XN=Cq*3}  
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， Jqt&TqX@s  
g. 点击OK ToB^/ n[  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 mzX <!  
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脚本代码： 1xkU;no  
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'#Language "WWB-COM" H~P"uYKIZ  
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Option Explicit 8uO@S*)0  
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Sub Main h1 D#,  
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    'Cleanup {&Bpf K;`)  
    ClearOutputWindow() O(( kv|X4  
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    Print "Merging RPC Photonics BSDF Data Files" r_kw "9  
    SetTextColor(255,0,0) &z\]A,=Tc  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." BI\+NGrB  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." ^3-Wxn9&  
    SetTextColor(0,0,0) PZdYkbj  
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    'Current directory of this script (should be the same as the text files being merged) 7Pc0|Z/  
    Dim cDir As String ClHaR  
    cDir = MacroDir$ & "\" g1uqsqYt  
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    'Array which will be populated with the list of files to be merged 7\ <4LX  
    Dim fList() As String, curFile As String 1x07ua@(v  
    GetFileList( cDir, fList )
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    Print "" PSdH9ea  
    Print "Files found for merging:" 4nh
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    For Each curFile In fList ZHshg`I`  
        Print Chr(9) & curFile X'&$wQ6,K  
    Next k"P2J}4eO  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. _e.b#{=9  
    Dim nameArray() As String, sampName As String sK:,c5^  
    nameArray = Split(fList(0)," 0-0.txt") OU(z};Is6Z  
    sampName  = nameArray(0) 6[9E^{(z  
    Print "" I_yIVw;  
    Print "Sample name: " & Chr(9) & sampName G5Ci"0  
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    'Open an output file and write the FRED header data n;"4`6L~  
    Dim outFile As String /S;o2\  
    outFile = cDir & sampName & "_FRED.txt" (%>Sln5hq  
    Open outFile For Output As #1 xLZQ\2q  
    Print #1, "type bsdf_data" \QUvImT  
    Print #1, "format angles=deg bsdf=value scale=1" ED/-,>[f  
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    'Loop the file list, skip the two header lines and write the remaining data to file 13
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    Dim lineArray() As String, curLine As Long J1<fE(X  
    For Each curFile In fList Q:~w;I  
        Print "Merging data from file " & curFile (nrrzOax  
        ReadFile( cDir & curFile, lineArray ) skcMGEB  
        For curLine = 2 To UBound(lineArray) HHZ!mYr  
            Print #1, lineArray(curLine) *eXO?6f%s^  
        Next 7atYWz~yG  
    Next vc2xAAQ  
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    'Close the output file nRQIrUNq  
    Close #1 wc%  
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    Print "Finished merging RPC data for sample " & sampName A!k}  
    Print "FRED formatted data file: " & Chr(9) & outFile x=B+FIJ  
End Sub U30)r+
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'Utility function to read the contents of a file into an array of strings. "|DR"rr'j  
Function ReadFile(ByVal fileName As String, _ <J-OwO a-1  
                  ByRef lineArray() As String) As Long vP}K(' (  
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    ReadFile = -1 }WGi9\9T&  
    Dim oFSO As Object Q]xW}5 /  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 29ft!R>[  
    Erase lineArray o33{tUp'  
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    Dim fid As Long 8VcAtrx_  
    If oFSO.fileexists( fileName ) Then CES FkAj~  
        fid = FreeFile() <(p1 j0_Q  
        Open fileName For Input As fid GP1>h.J  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) N/?MsrZw  
        Close fid _R(5?rG,  
    End If n'*Ljp  
    Set oFSO = Nothing $fKwJFr  
    Return UBound( lineArray ) !v;r3*#Nky  
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End Function J|FyY)_  
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Sub GetFileList( ByVal in_dir As String, _ Z `\7B e  
                 ByRef in_flist() As String ) oZCi_g 5i  
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    'Redimension the file list array vWkKNB  
    Erase in_flist T4!]^_t^  
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    'Tracks how many files are found y]jh*KD[  
    Dim fCount As Long Ic=V:  
    fCount = 0 2FVKgyV  
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    'Recurse directory and search for text files @$+[IiP  
    Dim f As String J$I1*~I4v  
    f = Dir$(in_dir & "*.txt") ESrWRO f9  
    While f <> "" E7eVg*Cvi  
        ReDim Preserve in_flist(fCount) [d&Faa[`  
        in_flist(fCount) = f {hg$?4IyQ  
        fCount += 1 (x^|  
        f = Dir$() lwg.'<  
    Wend C(0Iv[~y/  
    ReDim Preserve in_flist(fCount-1) rbtV,Y  
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End Sub YqJIp. Z  
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