[分享]RPC Photonics扩散片BSDF [复制链接]

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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。 1w1(FpQO.  
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背景： l,,5OZw  
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。 2Hy$SSH  
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。 !3?HpR/nV  
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步骤 ,#D&*  
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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。 =;^2#UxXA&  
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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） >qAQNX  
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 $I>.w4G}  
例如下所示： *jf (TIU  
Sample name:  EDF-C1-56 6W#M[0  
Merging data from file EDF-C1-56 0-0.txt :2K0/@<x  
Finished merging RPC data for sample EDF-C1-56 p
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FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt </qXKEu`_  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 &YqgMC  
a. 创建一个新的散射库 L[Tr"BW  
b. 散射模型命名 uK3,V0 yz  
c. 改变散射模型为“Tabulated BSDF”. n#bC,  
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 ） wGLZzqgq  
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。 ndW??wiM  
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， &kYg >X  
g. 点击OK <EJ}9`
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5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 krI<'m;a  
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脚本代码： ?5jkb  
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'#Language "WWB-COM" h]vA%VuE'E  
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Option Explicit 4CfPa6_  
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Sub Main (A/V(.!  
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    'Cleanup lUUeM\  
    ClearOutputWindow() $>]7NT
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    Print "Merging RPC Photonics BSDF Data Files" {b=]JPE  
    SetTextColor(255,0,0) "4oY F:h  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." IGOqV>;  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." :a[L-lr`e  
    SetTextColor(0,0,0) 1[:?oEI  
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    'Current directory of this script (should be the same as the text files being merged) QcIa%lf  
    Dim cDir As String Nt'(JAZ;  
    cDir = MacroDir$ & "\" Xr6UN{_-  
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    'Array which will be populated with the list of files to be merged *";,HG?|Iz  
    Dim fList() As String, curFile As String 3-Xum*)Y  
    GetFileList( cDir, fList ) 7b \HbgZ  
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    Print "" 1^b-J0  
    Print "Files found for merging:" &v'e;W  
    For Each curFile In fList mJ
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        Print Chr(9) & curFile q.g<gu]  
    Next Y u8a8p|  
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    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. t' o:aI  
    Dim nameArray() As String, sampName As String ZlUd^6|:3  
    nameArray = Split(fList(0)," 0-0.txt") 
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    sampName  = nameArray(0) I+kDx=T!  
    Print "" R<a7TkL4?  
    Print "Sample name: " & Chr(9) & sampName Ky|dRbK,  
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    'Open an output file and write the FRED header data b'3w.%^  
    Dim outFile As String /RIvUC1  
    outFile = cDir & sampName & "_FRED.txt" ggzg,~V  
    Open outFile For Output As #1 A<ur20  
    Print #1, "type bsdf_data" sFT-aLpL@V  
    Print #1, "format angles=deg bsdf=value scale=1" :1PT`:Y  
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    'Loop the file list, skip the two header lines and write the remaining data to file vxzh|uF  
    Dim lineArray() As String, curLine As Long hdXdz aNS  
    For Each curFile In fList +DY%Y `0  
        Print "Merging data from file " & curFile 4ac2^`  
        ReadFile( cDir & curFile, lineArray ) ;*{y!pgb  
        For curLine = 2 To UBound(lineArray) Ugp[Ugr  
            Print #1, lineArray(curLine) "\Zsr6y  
        Next hl(M0cxEWP  
    Next cz~Fz;)2{N  
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    'Close the output file uosFpa  
    Close #1 `b=?z%LuT  
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    Print "Finished merging RPC data for sample " & sampName 4onRO!G,  
    Print "FRED formatted data file: " & Chr(9) & outFile vUk <z*  
End Sub WZOi,  
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'Utility function to read the contents of a file into an array of strings. Uf}s6#  
Function ReadFile(ByVal fileName As String, _ xX.fN7[  
                  ByRef lineArray() As String) As Long |JC/A;ZH  
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    ReadFile = -1 f"\G"2C  
    Dim oFSO As Object jQxv`H  
    Set oFSO = CreateObject("Scripting.FileSystemObject") $!h21  
    Erase lineArray O8%+5l`T!  
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    Dim fid As Long 2MS1<VKZ@  
    If oFSO.fileexists( fileName ) Then $p#)xx7  
        fid = FreeFile() u[5*RTE
 
        Open fileName For Input As fid A.8{LY;  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) ..`J-k  
        Close fid (RW02%`jjy  
    End If ;m`k#J?  
    Set oFSO = Nothing r-&Rjg  
    Return UBound( lineArray ) 1S/KT4  
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End Function Z7a~M3VnZ  
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Sub GetFileList( ByVal in_dir As String, _ q1Gc0{+)  
                 ByRef in_flist() As String ) r`Y[XzT9  
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    'Redimension the file list array `a2%U/U  
    Erase in_flist ?:73O`sX:  
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    'Tracks how many files are found DC4O@"  
    Dim fCount As Long lO&TSPD^  
    fCount = 0 \wwY?lOe  
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    'Recurse directory and search for text files =aR'S\<  
    Dim f As String 2Hl0besm  
    f = Dir$(in_dir & "*.txt") }q7rR:g  
    While f <> "" d~n|F|`:  
        ReDim Preserve in_flist(fCount) `p0+j  
        in_flist(fCount) = f /R\]tl#2j  
        fCount += 1 =8:m:Y&|`G  
        f = Dir$() ~IrrX,mp:  
    Wend v0Ww~4|],  
    ReDim Preserve in_flist(fCount-1) 6a$=m3ic  
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End Sub o,}`4_N||  
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