[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： +;T%7j"wz  
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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。 @gd-lcMYW  
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背景： 7^1ikmYY
 
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。 B(~D*H2T[  
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。 !**q20-aP  
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步骤 S$Wd}2>  
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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。 (/^&3xs9  
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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） V}("8L  
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 /Wa+mp  
例如下所示： tU(6%zvR  
Sample name:  EDF-C1-56 wFe</U-';  
Merging data from file EDF-C1-56 0-0.txt |laqy`D  
Finished merging RPC data for sample EDF-C1-56 WrV|<%EQh  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt Rj8l]m6U9  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 0 [s1!Cm!i  
a. 创建一个新的散射库 +1rJ;G  
b. 散射模型命名 wZ\0<skU  
c. 改变散射模型为“Tabulated BSDF”. E'C[+iK6,  
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 ） (mzyA%;W  
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。 4#o` -vcW  
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， *]rV,\z:  
g. 点击OK !"wIb.j}0  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 a P`;Nr=  
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脚本代码： N.fIg  
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'#Language "WWB-COM" ow&R~_  
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Option Explicit cD 1p5U  
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Sub Main ?HW*qD#k  
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    'Cleanup M|\XFO  
    ClearOutputWindow() y
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    Print "Merging RPC Photonics BSDF Data Files" )t|M)zJ  
    SetTextColor(255,0,0) Mqna0"IYx*  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." %rf<YZ.\  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." 7 `|-
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    SetTextColor(0,0,0) a+Z/=YUR  
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    'Current directory of this script (should be the same as the text files being merged) <h^vl-L>  
    Dim cDir As String +UB.
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    cDir = MacroDir$ & "\" 7,:QFV  
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    'Array which will be populated with the list of files to be merged VH8,!#Q;  
    Dim fList() As String, curFile As String f\Qi()  
    GetFileList( cDir, fList ) Qml<JF  
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    Print "" (*#S%4(YX  
    Print "Files found for merging:" J"|o g|Tz
 
    For Each curFile In fList V ]Z{0  
        Print Chr(9) & curFile &Y\`FY\  
    Next 0(]C$*~mk  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. Nkc=@l{  
    Dim nameArray() As String, sampName As String u-8,9  
    nameArray = Split(fList(0)," 0-0.txt") q>,i `*  
    sampName  = nameArray(0) UF?qL1w  
    Print "" ]@
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    Print "Sample name: " & Chr(9) & sampName xgfK0-T|[  
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    'Open an output file and write the FRED header data hivWQ$6%  
    Dim outFile As String -2f_e3jF  
    outFile = cDir & sampName & "_FRED.txt" {>90d(j  
    Open outFile For Output As #1 j2V^1  
    Print #1, "type bsdf_data" 3~Ah8
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    Print #1, "format angles=deg bsdf=value scale=1" e~xN[Q\0]  
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    'Loop the file list, skip the two header lines and write the remaining data to file &S/KR$^ %  
    Dim lineArray() As String, curLine As Long h^cM#L^B  
    For Each curFile In fList {ymD.vf=9+  
        Print "Merging data from file " & curFile a:C
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        ReadFile( cDir & curFile, lineArray ) :GK]"sNC  
        For curLine = 2 To UBound(lineArray) ih~ R?W  
            Print #1, lineArray(curLine) ttgb"Wb%S  
        Next 9[T}cN=|  
    Next NU O9,  
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    'Close the output file ).5$c0`U&  
    Close #1 Re-4y5f  
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    Print "Finished merging RPC data for sample " & sampName p4[cPt~C  
    Print "FRED formatted data file: " & Chr(9) & outFile U8 '}(  
End Sub Y$ZZ0m  
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'Utility function to read the contents of a file into an array of strings. ><^ ,  
Function ReadFile(ByVal fileName As String, _ uS;N&6;:  
                  ByRef lineArray() As String) As Long )k$ +T%  
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    ReadFile = -1 D&#wn.0|E  
    Dim oFSO As Object 0sIwU!=vm  
    Set oFSO = CreateObject("Scripting.FileSystemObject") h_n`E7&bG  
    Erase lineArray >We4F2?  
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    Dim fid As Long DgW*Br8<  
    If oFSO.fileexists( fileName ) Then $9bLD >.  
        fid = FreeFile() fgdqp8~  
        Open fileName For Input As fid GUSEbIz):  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) vq=nG]cE)  
        Close fid /6
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    End If GKIO@!@[  
    Set oFSO = Nothing m7!Mstu  
    Return UBound( lineArray ) B)*?H=f/  
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End Function 
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Sub GetFileList( ByVal in_dir As String, _ Xs}.7  
                 ByRef in_flist() As String ) )B)ecJJ_  

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    'Redimension the file list array ^ZP $(a4  
    Erase in_flist hh#p=Y(f  
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    'Tracks how many files are found cao=O \Y7  
    Dim fCount As Long UB^OMB-W.m  
    fCount = 0 %^Zu^uu  
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    'Recurse directory and search for text files /0CS2mLC  
    Dim f As String A*^aBWFR  
    f = Dir$(in_dir & "*.txt") jzvrJ14  
    While f <> "" XtCG.3(LY  
        ReDim Preserve in_flist(fCount) bY&!d.  
        in_flist(fCount) = f z>lIZ}  
        fCount += 1 :
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        f = Dir$() [] cF*en  
    Wend h(C@IIO^;G  
    ReDim Preserve in_flist(fCount-1) V$0mcwH  
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End Sub 4Dy|YH$>S  
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