1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
#!/usr/bin/env python
# coding: utf-8
#
# Project: Azimuthal integration
# https://github.com/silx-kit/pyFAI
#
# Copyright (C) 2015-2018 European Synchrotron Radiation Facility, Grenoble, France
#
# Principal author: Jérôme Kieffer (Jerome.Kieffer@ESRF.eu)
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
"test suite for polarization corrections"
__author__ = "Jérôme Kieffer"
__contact__ = "Jerome.Kieffer@ESRF.eu"
__license__ = "MIT"
__copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
__date__ = "16/10/2020"
import unittest
import numpy
import logging
logger = logging.getLogger(__name__)
from ..azimuthalIntegrator import AzimuthalIntegrator
class TestPolarization(unittest.TestCase):
def setUp(self):
unittest.TestCase.setUp(self)
self.shape = (13, 13)
Y, X = numpy.ogrid[-6:7, -6:7]
self.rotY = numpy.radians(30.0 * Y)
self.rotX = numpy.radians(30.0 * X)
self.tth = numpy.sqrt(self.rotY ** 2 + self.rotX ** 2)
chi = numpy.arctan2(self.rotY, self.rotX)
self.ai = AzimuthalIntegrator(dist=1, pixel1=0.1, pixel2=0.1)
self.ai._cached_array["2th_center"] = self.tth
self.ai._cached_array["chi_center"] = chi
self.epsilon = 1e-15
def tearDown(self):
unittest.TestCase.tearDown(self)
self.shape = self.rotY = self.rotX = self.tth = self.ai = None
def testNoPol(self):
"without polarization correction should be 1"
self.assertTrue(abs(self.ai.polarization(factor=None) - numpy.ones(self.shape)).max() == 0, "without polarization correction should be 1")
def testCircularPol(self):
"Circular polarization should decay in (1+(cos2θ)^2)/2"
pol = ((1.0 + numpy.cos(self.tth) ** 2) / 2.0).astype("float32")
# print([abs(self.ai.polarization(factor=0, axis_offset=i) - pol).max() for i in range(6)])
self.assertTrue(abs(self.ai.polarization(factor=0) - pol).max() == 0, "with circular polarization correction is independent of chi")
self.assertTrue(abs(self.ai.polarization(factor=0, axis_offset=1) - pol).max() == 0, "with circular polarization correction is independent of chi, 1")
self.assertTrue(abs(self.ai.polarization(factor=0, axis_offset=2) - pol).max() == 0, "with circular polarization correction is independent of chi, 2")
self.assertTrue(abs(self.ai.polarization(factor=0, axis_offset=3) - pol).max() == 0, "with circular polarization correction is independent of chi, 3")
def testHorizPol(self):
"horizontal polarization should decay in (cos2θ)**2 in horizontal plane and no correction in vertical one"
self.assertTrue(abs(self.ai.polarization(factor=1)[:, 6] - numpy.ones(13)).max() == 0, "No correction in the vertical plane")
self.assertTrue(abs(self.ai.polarization(factor=1)[6] - numpy.cos(self.rotX) ** 2).max() < self.epsilon, "cos(2th)^2 like in the horizontal plane")
def testVertPol(self):
"Vertical polarization should decay in (cos2θ)**2 in vertical plane and no correction in horizontal one"
self.assertTrue(abs(self.ai.polarization(factor=-1)[6] - numpy.ones(13)).max() == 0, "No correction in the horizontal plane")
self.assertTrue(abs(self.ai.polarization(factor=-1)[:, 6] - (numpy.cos((2 * self.rotX)) + 1) / 2).max() < self.epsilon, "cos(2th)^2 like in the verical plane")
def testoffsetPol(self):
"test for the rotation of the polarization axis"
self.assertTrue(abs(self.ai.polarization(factor=1, axis_offset=numpy.pi / 2)[6] - numpy.ones(13)).max() == 0, "No correction in the horizontal plane")
self.assertTrue(abs(self.ai.polarization(factor=1, axis_offset=numpy.pi / 2)[:, 6] - (numpy.cos((2 * self.rotX)) + 1) / 2).max() < self.epsilon, "cos(2th)^2 like in the verical plane")
def suite():
loader = unittest.defaultTestLoader.loadTestsFromTestCase
testsuite = unittest.TestSuite()
testsuite.addTest(loader(TestPolarization))
return testsuite
if __name__ == '__main__':
runner = unittest.TextTestRunner()
runner.run(suite())
|
