[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： ;H lv
  
oWmla*nCKL  
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。 SCij5il%  
Pp2)P7  
背景： HdM;c*K  
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。 ?F/3]lsggT  
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。 eORt qX8*  
YVT^}7#
  
o9i\[Ul  
OjZ@_V:  
步骤 JFZ p^{  
iweP3u##  
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。 rAKdf??  
;QYK {3R?  
9=|5-?^  
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） \IKr+wlN8  
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 7F.,Xvw&@  
例如下所示： f@0`,  
Sample name:  EDF-C1-56 &>o)7H];  
Merging data from file EDF-C1-56 0-0.txt \ (,2^T'$J  
Finished merging RPC data for sample EDF-C1-56 \cG'3\GI  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt H|Ems}b  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 +-hmITJv  
a. 创建一个新的散射库 Ero3A'f  
b. 散射模型命名 <  -Nj  
c. 改变散射模型为“Tabulated BSDF”. V;"'!dVX  
d. 在File框出右键选择“Replace With Data From a File”, 选择步骤三生成的数据文件（如EDF-C1-56_FRED.txt ） ^|Y!NHYH$Z  
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。 c\Dv3bF  
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， iaB5t<t1r  
g. 点击OK }49?Z3  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 pfT7  
mIyaoIE|$  
)l=j,4nn  
脚本代码： tVOx  
>97N $  
'#Language "WWB-COM" 4P8:aZM  
!>Xx</iD1  
Option Explicit yC[}gHv  
gnQd#`  
Sub Main 9g7T~|P  
gisZmu0  
    'Cleanup n#*cVB81  
    ClearOutputWindow() ?g'l/xuRe  
yZ`\.GgC^&  
    Print "Merging RPC Photonics BSDF Data Files" 6[cMPp x  
    SetTextColor(255,0,0) -a3C3!!  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." KnuqU2< {  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." (f)QEho7  
    SetTextColor(0,0,0) >a<;)K^1  
iY="M_kQ_  
    'Current directory of this script (should be the same as the text files being merged) R$q:Ct  
    Dim cDir As String R&?p^!`%  
    cDir = MacroDir$ & "\" HkrNt/]  
BsJClKp/  
    'Array which will be populated with the list of files to be merged 1peN@Yk2W  
    Dim fList() As String, curFile As String )lZb=t  
    GetFileList( cDir, fList ) \|Mz'*  
fIu/*PFPVY  
    Print "" E:2Or~  
    Print "Files found for merging:" v"`w'+  
    For Each curFile In fList
J&Ah52  
        Print Chr(9) & curFile x`4">:IA  
    Next '`S,d[~  
j:0z/gHp$  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. |q?A8@\u  
    Dim nameArray() As String, sampName As String {J[0U
Z6  
    nameArray = Split(fList(0)," 0-0.txt") CGQ`i  
    sampName  = nameArray(0) #}.db?[Rv  
    Print "" (uSfr]89'  
    Print "Sample name: " & Chr(9) & sampName [,VD
^\  
d;`JDT  
    'Open an output file and write the FRED header data &W1cc#(  
    Dim outFile As String Ta_#Rg*!  
    outFile = cDir & sampName & "_FRED.txt" :>|[ o&L  
    Open outFile For Output As #1 a$ Z06j  
    Print #1, "type bsdf_data" Gd!y,n&s  
    Print #1, "format angles=deg bsdf=value scale=1" _s^sZ{'2_  
OmsNo0OA  
    'Loop the file list, skip the two header lines and write the remaining data to file uKK+V6}!kj  
    Dim lineArray() As String, curLine As Long `On%1%k8  
    For Each curFile In fList sq_ f[!  
        Print "Merging data from file " & curFile Hd :2  
        ReadFile( cDir & curFile, lineArray ) kEi!q  
        For curLine = 2 To UBound(lineArray) y:mXv<g  
            Print #1, lineArray(curLine) LBTf}T\  
        Next PAJt M  
    Next o<Q~pd#Ip,  
)Zox;}WK+  
    'Close the output file Uo# Pe@ieQ  
    Close #1 uZCPxog  
1$4dzI()  
    Print "Finished merging RPC data for sample " & sampName ZjWI~"]  
    Print "FRED formatted data file: " & Chr(9) & outFile alyWp  
End Sub }5EvBEv-)  
*5u0`k^j  
'Utility function to read the contents of a file into an array of strings. QN":Qk(,q  
Function ReadFile(ByVal fileName As String, _ dW6sA65<Y  
                  ByRef lineArray() As String) As Long @u?m4v{  
arm26YA-,  
    ReadFile = -1 H+` Zp  
    Dim oFSO As Object >HyZ~M  
    Set oFSO = CreateObject("Scripting.FileSystemObject") U 1vZr{\  
    Erase lineArray w~Aw?75t  
,VI2dNst\  
    Dim fid As Long S3$&}I <  
    If oFSO.fileexists( fileName ) Then ^DD]jx  
        fid = FreeFile() 5y0N }}  
        Open fileName For Input As fid RGsgT^  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) tw,uV)xm  
        Close fid ]@0C1r  
    End If ]v=A}}kS  
    Set oFSO = Nothing !ap}+_IA7^  
    Return UBound( lineArray ) /@ m]@  
''tCtG" Xi  
End Function "\3C)Nz?  
6o
6I]QL  
Sub GetFileList( ByVal in_dir As String, _ ;0FfP  
                 ByRef in_flist() As String ) EV/DJ$C }  
%py3fzg  
    'Redimension the file list array 1R-WJph  
    Erase in_flist k..AP<hH  
BlnR{Y  
    'Tracks how many files are found id+ ~ V  
    Dim fCount As Long W[/Txc0$  
    fCount = 0 3N257]  
lha)4d  
    'Recurse directory and search for text files \xG_q>1_  
    Dim f As String TophV}@B`  
    f = Dir$(in_dir & "*.txt") e>0gE`8A  
    While f <> "" ||D PIn]  
        ReDim Preserve in_flist(fCount) z9Z4MXl  
        in_flist(fCount) = f T5|e\<l  
        fCount += 1 Y \Gx|  
        f = Dir$() gWQ(
B  
    Wend xIA]5@;a  
    ReDim Preserve in_flist(fCount-1) SP.k]@P  
V/`vX;
%  
End Sub KT[ZOtu  
$7"
Y/9Y  
/g$G G9  
QQ：2987619807 zX lcu_rc