RPC Photonics扩散片BSDF
摘要: _<6E>"*m |;(>q 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。 }U^iVq* 8 4lT# ^q 背景: ]pWn%aGv*Y 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。 W%1/:_ 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。 _oHxpeM
图1. RPC Photonics工程漫射体结构及光束投射形状 2U`!0~pod )b~+\xL5J 2c'<rkA 步骤 m f\tMik< ~#dfZa& 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。 ^KJi|'B |&MOus#v
图2. RPC Photonics工程漫射体不同类型的散射数据 {wl7&25 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) ?L| Ai\| 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 x21XzGLY|} 例如下所示: x9o(q`N Sample name: EDF-C1-56 o]eG+i6g] Merging data from file EDF-C1-56 0-0.txt [1l OGck[ Finished merging RPC data for sample EDF-C1-56 k*rG^imX FRED formatted data file: D:\FRED\散射片数据\EDF-C1-56_FRED.txt dbg%n 0h 4、 生成了FRED可识别的文件后,将散射模型导入到FRED里面 Jim5Ul a. 创建一个新的散射库 t9.| i H b. 散射模型命名 p@?ud% c. 改变散射模型为“Tabulated BSDF”. Uuktq)NU 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 ) :7*9W|e
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。 ,ZZ5A;) 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, sD9OV6^{?K g. 点击OK WQ9VcCY 5、 数据输入后,可点击“Plot”按钮验证BSDF模型及总的散射值 6H!l>@a7v 6n\){dkZ~ g'9~T8i& ^ 脚本代码: \"X_zM yuhY )T '#Language "WWB-COM" JF'<"" [M#(su0fv Option Explicit gX`C76P! sw50lId Sub Main 8yybZ@ /GF"D5 'Cleanup FzF#V=9lP ClearOutputWindow() hb(H-`16 K."W/A! Print "Merging RPC Photonics BSDF Data Files" TCK#bJ SetTextColor(255,0,0) 4YXp,U Print "Note: Script should be located in the same folder as the BSDF TXT files." hP_{$c{4:g Print "Note: Do not run this script multiple times without deleting the output file between executions." #@F SetTextColor(0,0,0) F5+!Gb En /Ri-iC > 'Current directory of this script (should be the same as the text files being merged) d>0 j!+s Dim cDir As String @P">4xVX{ cDir = MacroDir$ & "\" A~;.9{6J[t ?z3|^oU~d 'Array which will be populated with the list of files to be merged \SBAk
h Dim fList() As String, curFile As String /PpZ6ne~[ GetFileList( cDir, fList ) H {uR+&< !>fi3#Fi Print "" 16"L;r Print "Files found for merging:"
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r; For Each curFile In fList Gb.}af#v Print Chr(9) & curFile R8|FqBs
Next \*#E4`Y p3B_NsXVZ 'Split the first text file name found to get the sample name. First file should be 0-0 measurement. LAGg(:3f3 Dim nameArray() As String, sampName As String 4rypT-%^ ; nameArray = Split(fList(0)," 0-0.txt") n>YgL}YZ? sampName = nameArray(0) 6Z-[-0o+g Print "" -AXMT3p=1 Print "Sample name: " & Chr(9) & sampName ig'4DmNC w!R J8 'Open an output file and write the FRED header data BQ{'r^u Dim outFile As String D7C%Y^K]>E outFile = cDir & sampName & "_FRED.txt" 7??j}ob> Open outFile For Output As #1 mFyYn,Mu| Print #1, "type bsdf_data" 9abn6S(XpJ Print #1, "format angles=deg bsdf=value scale=1" _<jccQ V_9>Z? 'Loop the file list, skip the two header lines and write the remaining data to file nz`"f, Dim lineArray() As String, curLine As Long u73/#!(1=H For Each curFile In fList % %QAC4 Print "Merging data from file " & curFile HqA3.<=F, ReadFile( cDir & curFile, lineArray ) t`0(5v For curLine = 2 To UBound(lineArray) PU%WpI.w Print #1, lineArray(curLine) aIE\B4w Next `4"&_ltD Next tmC9p6% {6*{P!H 'Close the output file 9z(h8H Close #1 |bmc6G[ DO?
bJ01 Print "Finished merging RPC data for sample " & sampName u_S>`I Print "FRED formatted data file: " & Chr(9) & outFile @TnAO8Q>XD End Sub _1?Fyu&<5 9'!I6;M 'Utility function to read the contents of a file into an array of strings. !B&1{ Function ReadFile(ByVal fileName As String, _ }q~xr3# ByRef lineArray() As String) As Long [oS.B\Vc yGPi9j{QXq ReadFile = -1 XXZ$^W& Dim oFSO As Object +isaqfy/ Set oFSO = CreateObject("Scripting.FileSystemObject") i{2rQy+ Erase lineArray 7033#@_ XJf1LGT5 Dim fid As Long O[#B906JB If oFSO.fileexists( fileName ) Then :aMp,DfM]P fid = FreeFile() 0 }aw9g Open fileName For Input As fid hH@pA:`s lineArray = Split(Input(LOF(fid), fid), vbCrLf) Dz&<6#L< Close fid Hy1f,D End If )IZ~!N|-w Set oFSO = Nothing veGRwir Return UBound( lineArray ) ZBfB4<M9xS Gex%~';+q End Function -\=kd {*B ;hp?wb Sub GetFileList( ByVal in_dir As String, _ >a1ovKF ByRef in_flist() As String ) +Pm}_"GU }g[(h=Qi 'Redimension the file list array W,)qE^+ Erase in_flist Oo95\Yf$N }!g^}BWWp 'Tracks how many files are found j*;/Cah]k Dim fCount As Long g3uI1]QXLg fCount = 0 3:WXrOl ]Q\/si& 'Recurse directory and search for text files jP|(y]! Dim f As String GPnSdGLC f = Dir$(in_dir & "*.txt") Cdd
+I5~ While f <> "" ~WG#Zci- ReDim Preserve in_flist(fCount) K-*q3oh
G in_flist(fCount) = f !'EE8Tp~F fCount += 1 L1E\^) f = Dir$() 4d0<uB&v' Wend 0UT2sM$ ReDim Preserve in_flist(fCount-1) nANoy6z: qjp<_aw End Sub f<0nj?
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