[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： f+vVR1  
<@bA?FY  
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。 v
uz4qCQ  
/,|CrNwY*  
背景： )y7_qxwbV  
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。 NHX>2-b  
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。 #G3N(wV3  
}gf}eH  
(foBp  
/&ygiH{^  
步骤 U/qE4u1J6M  
gdj^df+2F  
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。 #p y
im_  
AH{^spD{7,  
_|isa]u\z  
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） k5+]SG`]]  
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 wX1ig  
例如下所示： '4;6u]d)2  
Sample name:  EDF-C1-56
Gk~l,wV>  
Merging data from file EDF-C1-56 0-0.txt Sav`%0q?7a  
Finished merging RPC data for sample EDF-C1-56 +_HdX w#  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt \Mi#{0f+q  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 & 7QH^  
a. 创建一个新的散射库 aw}+'(?8]  
b. 散射模型命名 kRIB<@{  
c. 改变散射模型为“Tabulated BSDF”. #\If]w*j  
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 ） :h";c"  
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。 z
REJ#r  
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， 9EF~l9`'U  
g. 点击OK #w3ru6*W  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 F!KV\?eM$  
w.kCBDL  
2f:Mm'XdB  
脚本代码： T%CxvZ  
:7;[`bm(G  
'#Language "WWB-COM" Pl~P-n  
,J
9}.}Hd  
Option Explicit -4L!k'uR  
=L0fZf  
Sub Main , &' Y  
5A_4\YpDR  
    'Cleanup 9F_6}.O  
    ClearOutputWindow() Z^tGu7x  
<Dw]yGK@  
    Print "Merging RPC Photonics BSDF Data Files" 1 ycc5=.  
    SetTextColor(255,0,0) (M% ;~y\  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." u2qV6/  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." @oH[SWx  
    SetTextColor(0,0,0) kN'Thq/ZE  
t;Wotfc[#0  
    'Current directory of this script (should be the same as the text files being merged) h-'wV${b  
    Dim cDir As String lpEDPvD_Vm  
    cDir = MacroDir$ & "\" By)3*<5a_  
jEU'.RBN%  
    'Array which will be populated with the list of files to be merged 2bA#D%PHD  
    Dim fList() As String, curFile As String R+. Nn  
    GetFileList( cDir, fList ) 5t'Fv<g  
cCng5Nq,c  
    Print "" |>sv8/!  
    Print "Files found for merging:" x1DVD!0~{  
    For Each curFile In fList  ~u/@rqF  
        Print Chr(9) & curFile H%.zXQ4}n  
    Next ul}'{|4  
b:B[3|  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. c/$*%J<  
    Dim nameArray() As String, sampName As String ^]rxhpS  
    nameArray = Split(fList(0)," 0-0.txt") !
`C?nY  
    sampName  = nameArray(0) h;n\*[fDc  
    Print "" +L6" vkz  
    Print "Sample name: " & Chr(9) & sampName a@SUi~+3  
W'G{K\(/  
    'Open an output file and write the FRED header data %1jdiHTaL  
    Dim outFile As String rUFFF'm\*a  
    outFile = cDir & sampName & "_FRED.txt" i/:5jI|  
    Open outFile For Output As #1 /oDpgOn  
    Print #1, "type bsdf_data" g5TkD~w"  
    Print #1, "format angles=deg bsdf=value scale=1" 97x%2.\:  
]piM/v\  
    'Loop the file list, skip the two header lines and write the remaining data to file 9[f%;WaS  
    Dim lineArray() As String, curLine As Long :1BM=_WwI  
    For Each curFile In fList ,|x\MHd?t_  
        Print "Merging data from file " & curFile
#J~Xv:LgD  
        ReadFile( cDir & curFile, lineArray ) QE6E
l'S  
        For curLine = 2 To UBound(lineArray) ,Qo}J@e(  
            Print #1, lineArray(curLine) C >kmIw'  
        Next UG=I~{L  
    Next As}eUm)B5c  
WJcVQMs  
    'Close the output file '8Qw:fh  
    Close #1 %LcH>sV  
}MjQP R  
    Print "Finished merging RPC data for sample " & sampName )[ w&C_>]  
    Print "FRED formatted data file: " & Chr(9) & outFile Gx;xj0-"  
End Sub ,]U[W  
x.G"D(  
'Utility function to read the contents of a file into an array of strings. 4[_L=zD  
Function ReadFile(ByVal fileName As String, _ THr8o V5  
                  ByRef lineArray() As String) As Long :s-EG;.  
-Qg,99M  
    ReadFile = -1 Uir*%*4:  
    Dim oFSO As Object z1}1*F"  
    Set oFSO = CreateObject("Scripting.FileSystemObject") 9C?cm:  
    Erase lineArray 4n4j=x]@  
NJ>,'s  
    Dim fid As Long CnQg*+  
    If oFSO.fileexists( fileName ) Then U%n,XOJ  
        fid = FreeFile() p~FQcW'a~  
        Open fileName For Input As fid 5R"
2Wd  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) rx}*u3x=  
        Close fid D8EeZUqU  
    End If 4D GY6PS  
    Set oFSO = Nothing fo;6huz  
    Return UBound( lineArray ) RCQAtBd  
QK'`=MU  
End Function drs-mt8  
?^Pq/V
tZ  
Sub GetFileList( ByVal in_dir As String, _ $(XgKq&xWZ  
                 ByRef in_flist() As String ) {GK(fBE  
quY "  
    'Redimension the file list array O%prD}x  
    Erase in_flist {&0mK"z_  
[jy0@Q9  
    'Tracks how many files are found =g >.X9lr  
    Dim fCount As Long F G3Sk!O6  
    fCount = 0 )7k&`?Mh  
JxnuGkE0[#  
    'Recurse directory and search for text files -E}>h[;qZ  
    Dim f As String d&5c_6oW  
    f = Dir$(in_dir & "*.txt") /MhS=gVxM  
    While f <> "" /%5_~Jkr,  
        ReDim Preserve in_flist(fCount) Q g$($   
        in_flist(fCount) = f \WiqN*ZF  
        fCount += 1 z'_&|-m  
        f = Dir$() 5Yn{?r\#F  
    Wend ka!Bmv)  
    ReDim Preserve in_flist(fCount-1) 0hFH^2%UY  
b~jIv:9T  
End Sub :Jjw"}SfK#  
pXve02b1B  
is9}ePC7Xu  
QQ：2987619807 =l_rAj~I|