[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： J>h;_jA  
CA*~2|  
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。 F0.zi>5  
Mk5RHDh  
背景： hKN6y%  
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。 {SdO9Yy?@7  
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。 fGarUV  
T8Na]V5  
?1w"IjUS  
f^e&hyC   
步骤 +|&0fGv;d9  
"dtlME{Bx  
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。 Y;_T=L  
m\-PU z&C  
/b%Q[ Ck_  
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） r?3Aqi"  
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 l
1r_b68  
例如下所示： Mudrg[@`  
Sample name:  EDF-C1-56 bVK$.*,  
Merging data from file EDF-C1-56 0-0.txt R=$Ls6z  
Finished merging RPC data for sample EDF-C1-56 wW5Yw i  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt I$j|Rq  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 A3q*$.[  
a. 创建一个新的散射库 u)~s4tP4  
b. 散射模型命名 28UVDG1?  
c. 改变散射模型为“Tabulated BSDF”. >r}Vf9 5[N  
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Vl"/  
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。 8x{
Hg9  
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， e U;jP]FA  
g. 点击OK Y/lN@  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 ti9}*8  
P%)b+H{$h  
7'eh)[T  
脚本代码： _yVPpA[a  
!^v\^Fc  
'#Language "WWB-COM" f#OQ (WTJE  
?\Q0kr.T%  
Option Explicit [{cC  
N`1r;%5  
Sub Main H(> M   
T|bZ9_?+2  
    'Cleanup aR)?a;}H  
    ClearOutputWindow() MZ~.(&  
o^GC=Aca`  
    Print "Merging RPC Photonics BSDF Data Files" .'lN4x  
    SetTextColor(255,0,0) )`Ed_F}k  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." KY+]RxX  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." L_?$ayZ;  
    SetTextColor(0,0,0) 9,WG!4:+W  
MGybGbd  
    'Current directory of this script (should be the same as the text files being merged) }4h0bI  
    Dim cDir As String zYr z08PJ  
    cDir = MacroDir$ & "\" 2 ~-( A  
RIjM(P  
    'Array which will be populated with the list of files to be merged 8*Zvr&B,G  
    Dim fList() As String, curFile As String @q)E=G1<o0  
    GetFileList( cDir, fList ) 9L"?wv  
.Dx2 ;lj  
    Print "" !<r8~A3!(  
    Print "Files found for merging:" -3vh!JMN  
    For Each curFile In fList ^:z7E1~  
        Print Chr(9) & curFile V(..8}LlD  
    Next %6i=lyH-  
@vAFfYU9<.  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. 7\%$>< K  
    Dim nameArray() As String, sampName As String W~NYU  
    nameArray = Split(fList(0)," 0-0.txt") 4B$bj`h  
    sampName  = nameArray(0) P)1
EA;  
    Print "" kl<g;3  
    Print "Sample name: " & Chr(9) & sampName 2AK}D%jfc  
(\& 62B1  
    'Open an output file and write the FRED header data !Uy>eji}  
    Dim outFile As String 6~@5X}^<0  
    outFile = cDir & sampName & "_FRED.txt" Z4@y?fv7s  
    Open outFile For Output As #1 7K:FeW'N  
    Print #1, "type bsdf_data" \ V?I+Gc  
    Print #1, "format angles=deg bsdf=value scale=1" %?dE{ir  
<Uwwux<v  
    'Loop the file list, skip the two header lines and write the remaining data to file r|-J8s#  
    Dim lineArray() As String, curLine As Long e&Rb  
    For Each curFile In fList )7AM3%z1?  
        Print "Merging data from file " & curFile :8]6#c6`74  
        ReadFile( cDir & curFile, lineArray ) Q>%E
`h  
        For curLine = 2 To UBound(lineArray) WZK :.y  
            Print #1, lineArray(curLine) Z= ik{/  
        Next ,`)OEI|1d  
    Next PbN3;c3  
^A#x<J+  
    'Close the output file PWG;&ma  
    Close #1 fTgbF{?xh  
zbg+6qs})  
    Print "Finished merging RPC data for sample " & sampName y@ .b 4  
    Print "FRED formatted data file: " & Chr(9) & outFile r?$&Z^  
End Sub 0_HJ.g!  
BA*&N>a  
'Utility function to read the contents of a file into an array of strings. {*fUJmao"  
Function ReadFile(ByVal fileName As String, _ W5X7FEW  
                  ByRef lineArray() As String) As Long pN+I]NgQ  
#JFYws  
    ReadFile = -1 oG\>--  
    Dim oFSO As Object y#e ?iE@  
    Set oFSO = CreateObject("Scripting.FileSystemObject") }VZM,.w  
    Erase lineArray CjV7q y  
D-D#`  
    Dim fid As Long ==`Pb  
    If oFSO.fileexists( fileName ) Then #G~wE*VR$  
        fid = FreeFile() tWX7dspx/  
        Open fileName For Input As fid X TM$a9)  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) B!iFmkCy  
        Close fid 9C=~1>S  
    End If ogp{rY  
    Set oFSO = Nothing ]_\AHnJ  
    Return UBound( lineArray ) m{O Dz:  
?sE@]]z  
End Function q#m!/wod  
4v>o%  
Sub GetFileList( ByVal in_dir As String, _ jm+blB^%K  
                 ByRef in_flist() As String ) T+(M8qb  
,zoB0([  
    'Redimension the file list array 9BO|1{  
    Erase in_flist r;'i<t{P  
1wlVz#f.  
    'Tracks how many files are found y:C)%cv}*  
    Dim fCount As Long bl`D+/V   
    fCount = 0 IqXBz.p  
\#2 s4RCji  
    'Recurse directory and search for text files %rw}u"3T  
    Dim f As String "R8.P/ 3  
    f = Dir$(in_dir & "*.txt") eX@v7i,}  
    While f <> "" @"0uM?_)-  
        ReDim Preserve in_flist(fCount) @wMQC\Z  
        in_flist(fCount) = f &M$Bt} <  
        fCount += 1 Enu!u~1]F  
        f = Dir$() r:73uRk  
    Wend %6N)G!P  
    ReDim Preserve in_flist(fCount-1) HmW=t}!  
n 3h^VQ*]G  
End Sub m^'~&!ba  
ry
kj2/O  
}'v{dK  
QQ：2987619807 JBvk)
ogM