Changes between Version 1 and Version 2 of NCNROutput1D_2DQxQy


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Timestamp:
Jul 7, 2010 10:02:22 AM (12 years ago)
Author:
srkline
Comment:

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  • NCNROutput1D_2DQxQy

    v1 v2  
    11The 2D "!QxQy ASCII" output files of SANS data are of the format below. Based on the instrument settings, each pixel of the 2D detector data is converted into Qx and Qy. The 2D detector is a normal XY coordinate system when viewed from the neutron source. Qx and Qy both positive is a point in the upper right quadrant and both negative is a point in the lower left quadrant. What corrections have been applied to the data depend on what (if any) reduction steps were applied before exporting the file. 
    22 
    3 In each file there is a header of information describing the sample information (gleaned from the raw data file) and information about the processing steps that were taken to generate the reduced data file. The data is in a 3-column format where the 3 columns are:[[BR]] 
     3In each file there is a header of information describing the sample information (gleaned from the raw data file) and information about the processing steps that were taken to generate the reduced data file. The data is in a 8-column format where the 8 columns are:[[BR]] 
    44 
    551- Qx (1/Angstrom)[[BR]] 
    662- Qy (1/Angstrom)[[BR]] 
    773- I(Qx,Qy) (1/cm)[[BR]] 
     84-err I(QxQy) (1/cm)[[BR]] 
     95- Qz (1/A)[[BR]] 
     106- SigmaQ Parallel (1/A)[[BR]] 
     117- SigmaQ Perpendicular (1/A)[[BR]] 
     128- fs Beamstop Shadow factor (0,1][[BR]] 
    813 
    9 No errors are currently carried with the data. 
     14Note that the Q-values are set up (naturally) on an XY grid. The resolution function is most conveniently defined at each XY value in terms of the orthogonal directions - parallel to Q and perpendicular to Q. 
     15 
     16The error on the intensity is currently calculated as the square root of the intensity. For later analysis, any error values that are zero, Inf, or NaN are set equal to the average error of the entire data set. A full error propagation through the data reduction is in progress. 
    1017 
    1118(only a snippet of the file is shown here) 
    1219 
    1320{{{ 
    14 FILE: SILIC009.SA3_SRK_S109   CREATED: 22-JAN-2008 02:39:11 
     21FILE: SILIC009.SA3_SRK_S109   CREATED: Fri, Jun 4, 2010 3:46:37 PM 
    1522LABEL: Silica 2 pct in D2O Scatt 1.3M                               
    1623MON CNT   LAMBDA (A)  DET_OFF(cm)   DET_DIST(m)   TRANS   THICK(cm) 
    17 7.6329e+06  6       20     1.33     0.72501     0.2 
     241e+08  6       20     1.33     0.7248     0.2 
    1825BCENT(X,Y)   A1(mm)   A2(mm)   A1A2DIST(m)   DL/L   BSTOP(mm)   DET_TYP   
    1926106.8  64.59  50    3    5.4675    0.142    50.8    ORNL   
    20 SAM: RAW Data File: SILIC009.SA3_SRK_S109 
    21 BGD: none 
    22 EMP: none 
    23 DIV: none 
    24 MASK: none 
    25 ABS Parameters (3-6): none 
    26 Average Choices: none 
     27SAM: SILIC009.SA3_SRK_S109 
     28BGD: SILIC004.SA3_SRK_S104, 
     29EMP: SILIC003.SA3_SRK_S103, 
     30DIV: PLEX_2NOV2007_NG3.DIV, 
     31MASK: DEFAULT.MASK, 
     32ABS Parameters (3-6): TSTAND=1;DSTAND=1;IZERO=1.2418e+05;XSECT=1 
     33Average Choices: AVTYPE=QxQy_ASCII;SAVE=Yes;NAME=Auto;PLOT=Yes; 
    2734 
    28 *** Data written from RAW folder and may not be a fully corrected data file *** 
    29 Data columns are Qx - Qy - I(Qx,Qy) 
     35*** Data written from ABS folder and may not be a fully corrected data file *** 
     36Data columns are Qx - Qy - I(Qx,Qy) - err(I) - Qz - SigmaQ_parall - SigmaQ_perp - fSubS(beam stop shadow) 
     37ERROR WAVE IS ONLY AN ESTIMATE  - 6/2010 
     38ASCII data created Fri, Jun 4, 2010 3:46:38 PM 
    3039 
    31 ASCII data created Wed, May 14, 2008 1:35:44 PM 
    32  
    33 -0.3940681      -0.2451703      121 
    34 -0.3907249      -0.2451703      62 
    35 -0.387372       -0.2451703      120 
    36 -0.3840096      -0.2451703      70 
    37 -0.3806376      -0.2451703      67 
    38 -0.3772562      -0.2451703      91 
    39 -0.3738652      -0.2451703      77 
    40 -0.3704649      -0.2451703      86 
    41 -0.3670552      -0.2451703      78 
    42 -0.3636362      -0.2451703      66 
    43 -0.3602079      -0.2451703      84 
    44 -0.3567703      -0.2451703      61 
    45 -0.3533236      -0.2451703      67 
     40-0.3778205      -0.2270851      0.1054546       0.3247378       0.09729926      0.02633375      0.002935865     1 
     41-0.3747085      -0.2273637      0.1062517       0.3259627       0.09613394      0.02617764      0.002936665     1 
     42-0.3715851      -0.2276406      0.09981947      0.3159422       0.09497544      0.02602152      0.002937462     1 
     43-0.3684504      -0.2279159      0.09411432      0.3067806       0.09382387      0.02586539      0.002938257     1 
     44-0.3653043      -0.2281895      0.08147036      0.2854301       0.09267932      0.02570928      0.002939048     1 
     45-0.3621468      -0.2284615      0.1085722       0.329503        0.09154189      0.0255532       0.002939837     1 
     46-0.3589782      -0.2287316      0.1018893       0.319201        0.09041167      0.02539716      0.002940621     1 
     47-0.3557983      -0.2290001      0.1163103       0.341043        0.08928876      0.02524117      0.002941402     1 
    4648}}} 
    4749[[BR]]