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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Project: Fast Azimuthal integration
# https://github.com/kif/pyFAI
#
#
# Copyright (C) European Synchrotron Radiation Facility, Grenoble, France
#
# Principal author: Jérôme Kieffer (Jerome.Kieffer@ESRF.eu)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
"test suite for polarization corrections"
__author__ = "Jérôme Kieffer"
__contact__ = "Jerome.Kieffer@ESRF.eu"
__license__ = "GPLv3+"
__copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
__date__ = "08/09/2014"
import unittest
import os
import numpy
import logging, time
import sys
import fabio
from utilstest import UtilsTest, Rwp, getLogger
logger = getLogger(__file__)
pyFAI = sys.modules["pyFAI"]
if logger.getEffectiveLevel() <= logging.INFO:
import pylab
class TestPolarization(unittest.TestCase):
shape = (13, 13)
Y, X = numpy.ogrid[-6:7, -6:7]
rotY =numpy.radians(30.0*Y)
rotX =numpy.radians(30.0*X)
tth = numpy.sqrt(rotY ** 2 + rotX ** 2)
chi = numpy.arctan2(rotY, rotX)
# print numpy.degrees(tth[6])
# print numpy.degrees(chi[6])
# print numpy.degrees(tth[:, 6])
# print numpy.degrees(chi[:, 6])
ai = pyFAI.AzimuthalIntegrator(dist=1, pixel1=0.1, pixel2=0.1)
ai._ttha = tth
ai._chia = chi
def testNoPol(self):
"without polarization correction should be 1"
self.assert_(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
self.assert_(abs(self.ai.polarization(factor=0) - pol).max() == 0, "with circular polarization correction is independent of chi")
self.assert_(abs(self.ai.polarization(factor=0, axis_offset=1) - pol).max() == 0, "with circular polarization correction is independent of chi")
def testHorizPol(self):
"horizontal polarization should decay in (cos2θ)**2 in horizontal plane and no correction in vertical one"
self.assert_(abs(self.ai.polarization(factor=1)[:, 6] - numpy.ones(13)).max() == 0, "No correction in the vertical plane")
self.assert_(abs(self.ai.polarization(factor=1)[6] - numpy.cos(self.rotX) ** 2).max() < 1e-15, "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.assert_(abs(self.ai.polarization(factor= -1)[6] - numpy.ones(13)).max() == 0, "No correction in the horizontal plane")
self.assert_(abs(self.ai.polarization(factor= -1)[:, 6] - (numpy.cos((2 * self.rotX)) + 1) / 2).max() < 1e-15, "cos(2th)^2 like in the verical plane")
def testoffsetPol(self):
"test for the rotation of the polarization axis"
self.assert_(abs(self.ai.polarization(factor=1, axis_offset=numpy.pi / 2)[6] - numpy.ones(13)).max() == 0, "No correction in the horizontal plane")
self.assert_(abs(self.ai.polarization(factor=1, axis_offset=numpy.pi / 2)[:, 6] - (numpy.cos((2 * self.rotX)) + 1) / 2).max() < 1e-15, "cos(2th)^2 like in the verical plane")
def test_suite_all_polarization():
testSuite = unittest.TestSuite()
testSuite.addTest(TestPolarization("testNoPol"))
testSuite.addTest(TestPolarization("testCircularPol"))
testSuite.addTest(TestPolarization("testHorizPol"))
testSuite.addTest(TestPolarization("testVertPol"))
testSuite.addTest(TestPolarization("testoffsetPol"))
# testSuite.addTest(TestPolarization("test2th"))
return testSuite
if __name__ == '__main__':
mysuite = test_suite_all_polarization()
runner = unittest.TextTestRunner()
runner.run(mysuite)
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