Source Code for Module reflectometry.reduction.reverse

 1  """ 
 2  Some machines allow the sample to be rotated by 180 
 3  degrees, reversing the usual sense of the angles. 
 4   
 5  We provide two corrections, one which reverses the usual sense of the 
 6  angles, and the other which assumes that all reflection is from the 
 7  top of the film and there is no back reflectivity. 
 8   
 9  ReverseCorrection 
10  FrontCorrection 
11  """ 
12   
13  from reflectometry.reduction.correction import Correction 
14   
15 -class ReverseCorrection(Correction): 
16      """ 
17      Reverse the sense of the reflection angles, making positive angles 
18      negative and vice versa 
19      """ 
20 -    def apply(self,data): 
21          data.sample.angle_x = -data.sample.angle_x 
22          data.detector.angle_x = -data.detector.angle_x 
23 -    def __str__(self): return "ReverseCorrection()" 
24   
25 -class FrontCorrection(Correction): 
26      """ 
27      Assume all reflection is off the top surface, reversing the sense 
28      of negative angles. 
29      """ 
30 -    def apply(self,data): 
31          data.sample.angle_x = abs(data.sample.angle_x) 
32          data.detector.angle_x = abs(data.detector.angle_x) 
33 -    def __str__(self): return "FrontCorrection()" 
34