[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： :{<|,3oNdR  
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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。 zd$'8/Cq  
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背景： &zYQH@  
Thorlabs和RPC Photonics联手共同推出的新型漫射体及光束整形技术，可以解决其他技术的不足，大大改善了诸如光刻系统、有效固态照明，显示，背光，显示亮度增强和投影屏等大多数应用的性能。这项我们称之为工程漫射体（Engineered DiffusersTM）的新概念，与其他技术有许多不同。与诸如磨砂玻璃、乳色玻璃和全息元件等随机漫射体截然不同，工程漫射体要求对于每个散射中心，通常为微透镜单元，都进行控制。例如全息漫射体可以视为一组随机排列的透镜，但是通过全息曝光形成的类透镜效果只能通过静态方式进行控制：而无法单独操控每个微透镜单元，这也帮助解释了全息漫射体无法控制光的分布和轮廓。另一方面，在工程漫射体中，每个微透镜单元形成漫射体，由其凹形纵断面和在阵列中的位置所确定。同时，为了确保漫射体不受输入光束变化的影响，并且不产生衍射效果，微透镜单元的分布是随机的，根据产生相应的光束形状函数所选取的概率分布函数来确定。因此，工程漫射体同时保留了随机与确定性漫射体的优点，从而实现高性能的光束整形功能。 6$#,$aO  
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。 #~Xj=M%
 
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步骤
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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。 e&ti(Q=  
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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） U/FysN_N!  
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 ,'C*?mms  
例如下所示： #2|biTJ  
Sample name:  EDF-C1-56 M_0f{  
Merging data from file EDF-C1-56 0-0.txt "3_X$`v"!  
Finished merging RPC data for sample EDF-C1-56 tF[)Y#  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt GX23c i  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 U:x;4  
a. 创建一个新的散射库 ~F@p}u8TV  
b. 散射模型命名 L0VZ>!*o  
c. 改变散射模型为“Tabulated BSDF”. q%d,E1  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） cZ%tJ(&\7X  
e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 ;Q3[} ]su  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， BZLIi O  
g. 点击OK I_#5gq  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 %i7U+v(d  
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脚本代码： 7r:&%?2:g  
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'#Language "WWB-COM" z}}P+P/  
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Option Explicit I[rR-4.F]  
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Sub Main 0"j:-1  
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    'Cleanup v`L]dY4,  
    ClearOutputWindow() ).HA#!SE  
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    Print "Merging RPC Photonics BSDF Data Files" zT}vaU6  
    SetTextColor(255,0,0) R68:=E4  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." }.s%J\ckx  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." K:9AP{+  
    SetTextColor(0,0,0) ]Vj($O:  
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    'Current directory of this script (should be the same as the text files being merged) |) cJ  
    Dim cDir As String &kvmLOI  
    cDir = MacroDir$ & "\" bD/ZKvg  
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    'Array which will be populated with the list of files to be merged a Z)1SX`D  
    Dim fList() As String, curFile As String W=g'Xu!|!2  
    GetFileList( cDir, fList ) f.j
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    Print "" izcjI.3e,  
    Print "Files found for merging:" mc`Z;D/mt  
    For Each curFile In fList ;`xCfOY(  
        Print Chr(9) & curFile =!DX,S7  
    Next  mVS^HQ:  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ->OVNmCB`+  
    Dim nameArray() As String, sampName As String EF$ASN
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    nameArray = Split(fList(0)," 0-0.txt") >Mh\jt\  
    sampName  = nameArray(0) `e;r$Vpd_  
    Print "" t%e<]2-8  
    Print "Sample name: " & Chr(9) & sampName *MlEfmB(  
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    'Open an output file and write the FRED header data qGhg?u"n:  
    Dim outFile As String MBjAe!,-  
    outFile = cDir & sampName & "_FRED.txt" (#6Fg|f4Y  
    Open outFile For Output As #1 6DU(KYN  
    Print #1, "type bsdf_data" AB3OG*C9  
    Print #1, "format angles=deg bsdf=value scale=1" o,?G(  
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    'Loop the file list, skip the two header lines and write the remaining data to file B1FJAKI);  
    Dim lineArray() As String, curLine As Long p<\!{5:  
    For Each curFile In fList ~s-gnp  
        Print "Merging data from file " & curFile IYtiX  
        ReadFile( cDir & curFile, lineArray ) N3lz-vP-  
        For curLine = 2 To UBound(lineArray) yFeFI@Hp 3  
            Print #1, lineArray(curLine) T(Yp90'6  
        Next 0#=xUk#LP`  
    Next 7@g0>1Fz  
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    'Close the output file pl[@U<8aw  
    Close #1 D/"velV  
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    Print "Finished merging RPC data for sample " & sampName N<
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    Print "FRED formatted data file: " & Chr(9) & outFile LauGT* z!  
End Sub xR kw+  
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'Utility function to read the contents of a file into an array of strings. co\Il]`R/  
Function ReadFile(ByVal fileName As String, _ N.q*jY=X|  
                  ByRef lineArray() As String) As Long smQl^ 6a  
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    ReadFile = -1 o o'7  
    Dim oFSO As Object X=1o$:7  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 5oCg&aT  
    Erase lineArray }ssja,;  
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    Dim fid As Long gjz-CY.hz  
    If oFSO.fileexists( fileName ) Then 2ry@<88  
        fid = FreeFile() <b *sn]l  
        Open fileName For Input As fid U$OI]Dd9  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) J;^PM:6  
        Close fid P%Vq#5  
    End If z k}AGw  
    Set oFSO = Nothing uY>M3h#qx  
    Return UBound( lineArray ) w1-P6cf  
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End Function XKws_  
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Sub GetFileList( ByVal in_dir As String, _ b+:J?MR;}  
                 ByRef in_flist() As String ) /RqWrpzx@  
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    'Redimension the file list array ZQf
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    Erase in_flist -L]-u6kC[  
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    'Tracks how many files are found &V~l(1  
    Dim fCount As Long RzL(Gnb  
    fCount = 0 LFW`ISY{  
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    'Recurse directory and search for text files ojlyW})$%  
    Dim f As String 2YKa <?_  
    f = Dir$(in_dir & "*.txt") A&Aj!#  
    While f <> "" mgVYKZWL-i  
        ReDim Preserve in_flist(fCount) >L!c} Ku  
        in_flist(fCount) = f :EQ{7Op`  
        fCount += 1 -j]k^  
        f = Dir$() MA:5'n  
    Wend LOi}\O8  
    ReDim Preserve in_flist(fCount-1) &R@([=1  
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End Sub 4L8hn4F
 
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