[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： )*h~dx_cm  
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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。 l,wN@Nk  
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背景： |`wsKr'  
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。 K"7;Y#1g  
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。 AF]!wUKxy  
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步骤 4/?}xD|?  
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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。 % Au$E&sj  
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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） ?4e6w  
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 l-}5@D[  
例如下所示： z\>X[yNpA  
Sample name:  EDF-C1-56 $?AA"Nz  
Merging data from file EDF-C1-56 0-0.txt @T1+b"TC  
Finished merging RPC data for sample EDF-C1-56 ]31XX=  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt 9ox|.68q  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 0WE1}.J<  
a. 创建一个新的散射库 
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b. 散射模型命名 ^85n9a?8  
c. 改变散射模型为“Tabulated BSDF”. FJ8@b  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ）
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e. 切换为“Varies w/angle” 选项（假定所有的RPC Photonics datasets 数据有多个测试角度。 d`uO7jlm  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， y[6&46r7D  
g. 点击OK ++DQS9b{  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 yr2L  
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脚本代码： T% 13 '  
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'#Language "WWB-COM" Yc`j  
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Option Explicit kN|5 J  
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Sub Main ikN!ut  
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    'Cleanup rn:zKTyhw  
    ClearOutputWindow() \UqS -j|  
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    Print "Merging RPC Photonics BSDF Data Files" HJaw\zbL  
    SetTextColor(255,0,0) a`b zFu{  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." )|y2Q  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." }?]yxa~  
    SetTextColor(0,0,0) uO@3vY',n  
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    'Current directory of this script (should be the same as the text files being merged) x2;i< |  
    Dim cDir As String >q@Sd  
    cDir = MacroDir$ & "\" 1Uemsx%'k  
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    'Array which will be populated with the list of files to be merged 6QLQ1k`  
    Dim fList() As String, curFile As String }"?nU4q;S  
    GetFileList( cDir, fList ) 51G=RYay9  
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    Print "" KBw9(  
    Print "Files found for merging:" R G0S
  
    For Each curFile In fList }PQSCl^I  
        Print Chr(9) & curFile PN"8 Y  
    Next 4Kn9*V  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 3<Z'F}lg  
    Dim nameArray() As String, sampName As String ]TBtLU3  
    nameArray = Split(fList(0)," 0-0.txt") mw(c[.
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    sampName  = nameArray(0) uR:=V9O  
    Print "" hzQ+9-qA  
    Print "Sample name: " & Chr(9) & sampName +rsl( 08FY  
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    'Open an output file and write the FRED header data %x}&=zx0*1  
    Dim outFile As String !/6\m!e|1R  
    outFile = cDir & sampName & "_FRED.txt" UiR,^/8ED  
    Open outFile For Output As #1 _+\:OB[Y  
    Print #1, "type bsdf_data" ~llMrl7  
    Print #1, "format angles=deg bsdf=value scale=1" t1w2u.]  
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    'Loop the file list, skip the two header lines and write the remaining data to file j&dx[4|m:h  
    Dim lineArray() As String, curLine As Long UXwB$@8  
    For Each curFile In fList 97Zk P=Cq  
        Print "Merging data from file " & curFile gX$0[ sIS.  
        ReadFile( cDir & curFile, lineArray ) jF2[bzY4  
        For curLine = 2 To UBound(lineArray) Y@]);MyL  
            Print #1, lineArray(curLine) J3~hzgY  
        Next '<%Nw-  
    Next =_8 UZk.  
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    'Close the output file U=F-]lD  
    Close #1 B;GxfYj  
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    Print "Finished merging RPC data for sample " & sampName Nmp>UE,7[  
    Print "FRED formatted data file: " & Chr(9) & outFile p@/(.uE  
End Sub ]-um\A4f  
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'Utility function to read the contents of a file into an array of strings. r(: 8!=~K  
Function ReadFile(ByVal fileName As String, _ 3>Q@r>c  
                  ByRef lineArray() As String) As Long ~V2ajM1Z&O  
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    ReadFile = -1 'Aj(i/CM  
    Dim oFSO As Object -9OMn}w/*  
    Set oFSO = CreateObject("Scripting.FileSystemObject") k,,!P""  
    Erase lineArray K85_>C%g  
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    Dim fid As Long xH<'GB)  
    If oFSO.fileexists( fileName ) Then :[Qp2Gg O\  
        fid = FreeFile() bZ>&QM  
        Open fileName For Input As fid D=r-  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) F!7f_m0=  
        Close fid Opv1B2  
    End If CAUijMI@  
    Set oFSO = Nothing S3uyn78hI  
    Return UBound( lineArray ) rI0)F  

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End Function uAu( +zV2  
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Sub GetFileList( ByVal in_dir As String, _ [_WI8~gY  
                 ByRef in_flist() As String ) cMDRWh  
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    'Redimension the file list array 
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    Erase in_flist `n 3FT=  
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    'Tracks how many files are found 4~O6$;!|~  
    Dim fCount As Long \ V6   
    fCount = 0 ^ED"rMI  
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    'Recurse directory and search for text files WP5VcBC  
    Dim f As String br0u
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    f = Dir$(in_dir & "*.txt") =G(*gx  
    While f <> "" LGIalf*7  
        ReDim Preserve in_flist(fCount) >b>MKm>q  
        in_flist(fCount) = f xC-BqVJ%_T  
        fCount += 1 {Q)dU-\  
        f = Dir$() E{uf\Fc
 
    Wend jCzGus!rM  
    ReDim Preserve in_flist(fCount-1) ^J8uhV;w  
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End Sub Sv7 i! j