[分享]RPC Photonics扩散片BSDF [复制链接]

摘要： >sAZT:&gv  
19od# d3+  
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。 =ogzq.+|  
bH}6N>Fp  
背景： Uf^zA/33  
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。 YxH"*)N  
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。 ~.qzQ_O/  
(g2?&b iuz  
bSmF"H0cP  
 V"n0"\k,  
步骤 8zew8I~s  
g0ec-  
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。 V>}@--$c-r  
h?wNmLre  
ra\Moy  
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） b#h?O}  
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 FoM4QO  
例如下所示： '0_Z:\ laU  
Sample name:  EDF-C1-56 uG1 1~uAt  
Merging data from file EDF-C1-56 0-0.txt h4CDZ  
Finished merging RPC data for sample EDF-C1-56 2XJn3wPi  
FRED formatted data file:  D:\FRED\散射片数据\EDF-C1-56_FRED.txt fsa  
4、 生成了FRED可识别的文件后，将散射模型导入到FRED里面 c)8V^7
=Q  
a. 创建一个新的散射库 U~z`u&/  
b. 散射模型命名 l,}{Y4\G  
c. 改变散射模型为“Tabulated BSDF”. qJQE|VM&  
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 ） `{fqnNJE  
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。 $M\|zUQu.  
f. 在底部的对话框中，选择透射散射、反射停并且你需要终止入射光线， }5
gAxR,  
g. 点击OK 8[LwG&  
5、 数据输入后，可点击“Plot”按钮验证BSDF模型及总的散射值 Z5juyzj  
'$u3i #.\  
yoTbIQ  
脚本代码： &Im{p7gf!b  
+5Z0-N@  
'#Language "WWB-COM" 6zK8-V?9F  
4,L(  
Option Explicit ~S}>|q$  
<1[WNj2[  
Sub Main gwk$|aT@  
<{@?c  
    'Cleanup $Gb] K{e  
    ClearOutputWindow() Tj@}O:q7:  
REnd# V2x  
    Print "Merging RPC Photonics BSDF Data Files" ^.Cfa  
    SetTextColor(255,0,0) 2SU G/-P#  
    Print "Note: Script should be located in the same folder as the BSDF TXT files." pq[RH-{  
    Print "Note: Do not run this script multiple times without deleting the output file between executions." qq}EXq^  
    SetTextColor(0,0,0)
!}wJ+R ^2  
EqzS={Olj  
    'Current directory of this script (should be the same as the text files being merged) a5WVDh,cR  
    Dim cDir As String 24{!j[,q@  
    cDir = MacroDir$ & "\" V-a/%
_D  
.{D[!Dp#h  
    'Array which will be populated with the list of files to be merged ?&Si P-G  
    Dim fList() As String, curFile As String ay6G1\0W  
    GetFileList( cDir, fList ) q[{q3-W  
3#R~>c2  
    Print "" "~x\bSY  
    Print "Files found for merging:" B]dHMLzl  
    For Each curFile In fList 8[(eV.  
        Print Chr(9) & curFile :@w ;no>=*  
    Next 6Uq@v8mh  
) Ph.  
    'Split the first text file name found to get the sample name.  First file should be 0-0 measurement. ~k+"!'1  
    Dim nameArray() As String, sampName As String 1 GUF,A+_O  
    nameArray = Split(fList(0)," 0-0.txt") .>>@q!!s!  
    sampName  = nameArray(0) ?RGL0`Lg  
    Print "" jEfrxlj  
    Print "Sample name: " & Chr(9) & sampName pc&/'zb  
aNb=gjLpt  
    'Open an output file and write the FRED header data pH.wCD:
1n  
    Dim outFile As String I1U
{t  
    outFile = cDir & sampName & "_FRED.txt" B1
m@  
    Open outFile For Output As #1 r AMnM>`  
    Print #1, "type bsdf_data" `),7*gn*)  
    Print #1, "format angles=deg bsdf=value scale=1" %Rv&VFg  
Gxv@a   
    'Loop the file list, skip the two header lines and write the remaining data to file (V@g?|LZ  
    Dim lineArray() As String, curLine As Long b_-ESs]g  
    For Each curFile In fList 4xhV
+Y  
        Print "Merging data from file " & curFile $7gzu4f  
        ReadFile( cDir & curFile, lineArray ) pI7\]e  
        For curLine = 2 To UBound(lineArray) )c5M;/s  
            Print #1, lineArray(curLine) !zLd,`  
        Next UK+;/Mtg  
    Next 3 D,PbAd  
])}{GW  
    'Close the output file 5%D:wS1  
    Close #1 iaXNf ])?  
t ),~w,7(J  
    Print "Finished merging RPC data for sample " & sampName
.Tt \U  
    Print "FRED formatted data file: " & Chr(9) & outFile T+NEw8C?/  
End Sub raY5
nc{  
~R-S$qizAC  
'Utility function to read the contents of a file into an array of strings. C
yO2Z  
Function ReadFile(ByVal fileName As String, _ '{XDhK  
                  ByRef lineArray() As String) As Long gbwKT`N*  
`x$d8(1J`#  
    ReadFile = -1 &0SGAJlec  
    Dim oFSO As Object _
z\oDd`'  
    Set oFSO = CreateObject("Scripting.FileSystemObject") !y$Hr[v  
    Erase lineArray 85Q2c  
2NAGXWE  
    Dim fid As Long Tn2Z{.q$  
    If oFSO.fileexists( fileName ) Then 2<>n8K  
        fid = FreeFile() E4[ |=<  
        Open fileName For Input As fid ,kuJWaUC@  
        lineArray = Split(Input(LOF(fid), fid), vbCrLf) tY !fO>Fn~  
        Close fid OGg9e  
    End If z*ZEw  
    Set oFSO = Nothing sp0&"&5  
    Return UBound( lineArray ) 7!w@u6Q  
</tiNc  
End Function WGKN>nV  
fL ng[&  
Sub GetFileList( ByVal in_dir As String, _ P482D)  
                 ByRef in_flist() As String ) l"o@.C}f/  
#rMMOu9r2  
    'Redimension the file list array i0{pm q  
    Erase in_flist !1+L0,I6  
mu)?SGpyE  
    'Tracks how many files are found u /JEQz1  
    Dim fCount As Long ^i_mGe
u  
    fCount = 0 j]r
E0Og  
}Xyu"P  
    'Recurse directory and search for text files Ks@S5:9sp  
    Dim f As String )`F?{Sg  
    f = Dir$(in_dir & "*.txt") /:>qhRFJA:  
    While f <> "" ^~-i>gTD  
        ReDim Preserve in_flist(fCount) 4Cke(G  
        in_flist(fCount) = f \2-!%i,  
        fCount += 1 'Kxs>/y3  
        f = Dir$() dG.s8r*?M  
    Wend 15VOQE5Fl`  
    ReDim Preserve in_flist(fCount-1) v3[Z]+ ]  
bBAZr`<&U  
End Sub Sd' uXX@  
8U0y86q>)E  
\:4W
bM:B  
QQ：2987619807 v3Tr6[9