[技术]RPC Photonics扩散片BSDF [复制链接]

摘要： g$ HL::  
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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。 Ni8%K6]z  
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背景： _CPj]m{  
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。 0$ON`Vsu|  
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。 @ R[K8  
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步骤 8o[gzW:Q)U  
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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。 ZR -RzT1  
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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）  71@kIJI  
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 sZ~03
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例如下所示： L*dGo,oN  
Sample name:  EDF-C1-56 F53 .g/[  
Merging data from file EDF-C1-56 0-0.txt !yT=*Cj4  
Finished merging RPC data for sample EDF-C1-56 tH&eKM4
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt w&f>VB~,1  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 S!#5  
a. 创建一个新的散射库 Op8Gj `  
b. 散射模型命名 :!l.ze{F  
c. 改变散射模型为“Tabulated BSDF”. j94~cYV  
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 ） ,tQNL\t  
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。 T59FRX  
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， 5Pq6X  
g. 点击OK J~xm[^0  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 8\9W:D@"x  
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脚本代码： eaNfCXHDN  
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'#Language "WWB-COM" :CezkD&  
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Option Explicit
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Sub Main .SmG)5U]  
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    'Cleanup J"< h#@`  
    ClearOutputWindow() ^`M%g2x  
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    Print "Merging RPC Photonics BSDF Data Files" KztQT9kY  
    SetTextColor(255,0,0) O"|d~VQ  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." Mv/ SU">F  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." mXhC-8P  
    SetTextColor(0,0,0) rN7JJHV  
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    'Current directory of this script (should be the same as the text files being merged) 4,W,E4 7  
    Dim cDir As String G5OGyQp  
    cDir = MacroDir$ & "\" Z_dL@\#|  
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    'Array which will be populated with the list of files to be merged nj00g>:>  
    Dim fList() As String, curFile As String G9xO>Xp^Al  
    GetFileList( cDir, fList ) %Jd!x{a`>A  
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    Print "" !mWm@}Ujg  
    Print "Files found for merging:" 4_CL1g  
    For Each curFile In fList 5+Tx01)  
        Print Chr(9) & curFile A /c  
    Next -qvMMit%7  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. A.
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    Dim nameArray() As String, sampName As String MK! @ND  
    nameArray = Split(fList(0)," 0-0.txt") !
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    sampName  = nameArray(0) )h>dD  
    Print "" @].!}tz  
    Print "Sample name: " & Chr(9) & sampName (nBh6u*  
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    'Open an output file and write the FRED header data /pU`-  
    Dim outFile As String #u+qV!4  
    outFile = cDir & sampName & "_FRED.txt" l O*  
    Open outFile For Output As #1 EB}~^ aY  
    Print #1, "type bsdf_data" {[/A?AV;F  
    Print #1, "format angles=deg bsdf=value scale=1" 6@47%%,}  
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    'Loop the file list, skip the two header lines and write the remaining data to file P*%P"g  
    Dim lineArray() As String, curLine As Long ?UIW&*h}  
    For Each curFile In fList q(R|3l^6T  
        Print "Merging data from file " & curFile n)D  
        ReadFile( cDir & curFile, lineArray ) V!yBH<X  
        For curLine = 2 To UBound(lineArray) r}Gku0Hu_E  
            Print #1, lineArray(curLine) car|&b
 
        Next o@[o6.B<  
    Next x;} 25A|  
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    'Close the output file 
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    Close #1 kSCpr0c  
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    Print "Finished merging RPC data for sample " & sampName aTvLQ@MQ  
    Print "FRED formatted data file: " & Chr(9) & outFile ]c|JxgU  
End Sub 7i02M~*uS  
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'Utility function to read the contents of a file into an array of strings. {x..> 4  
Function ReadFile(ByVal fileName As String, _ {-]K!tWda  
                  ByRef lineArray() As String) As Long vgg)f~  
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    ReadFile = -1 EKN<KnU%  
    Dim oFSO As Object [TqX"@4NS  
    Set oFSO = CreateObject("Scripting.FileSystemObject") Nr)DU.f  
    Erase lineArray +<V$G/"  
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    Dim fid As Long K$:btWSm  
    If oFSO.fileexists( fileName ) Then )S`Yl;oL  
        fid = FreeFile() #(a;w  
        Open fileName For Input As fid H<g8u{ $  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) 0HbCT3g.  
        Close fid T
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    End If j':<7n/A  
    Set oFSO = Nothing ,qV7$u  
    Return UBound( lineArray ) 6e5A8e8"]  
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End Function GN5*  
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Sub GetFileList( ByVal in_dir As String, _ vJ 28A  
                 ByRef in_flist() As String ) qAlX#]  
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    'Redimension the file list array Y[rCF=ZVH  
    Erase in_flist qkC{IBN92  
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    'Tracks how many files are found sdd%u~4,X  
    Dim fCount As Long m?4HVv  
    fCount = 0 c3<H272\  
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    'Recurse directory and search for text files KxFA@3  
    Dim f As String LCHw.  
    f = Dir$(in_dir & "*.txt") {D,- Whi  
    While f <> "" #0^a-47PA<  
        ReDim Preserve in_flist(fCount) GFnwj<V+{  
        in_flist(fCount) = f :Z83*SPc  
        fCount += 1 J~ *>pp#U  
        f = Dir$() QMDkkNK  
    Wend (Bpn9}F-V.  
    ReDim Preserve in_flist(fCount-1) )! kl:  
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End Sub +lf`Dd3