Source code for sas.sascalc.calculator.kiessig_calculator
"""
This module is a small tool to allow user to quickly
determine the size value in real space from the
fringe width in q space.
"""
from math import pi, fabs
_DQ_DEFAULT = 0.05
[docs]class KiessigThicknessCalculator(object):
"""
compute thickness from the fringe width of data
"""
[docs] def __init__(self):
# dq value
self.deltaq = _DQ_DEFAULT
# thickenss value
self.thickness = None
# unit of the thickness
self.thickness_unit = 'A'
[docs] def set_deltaq(self, dq=None):
"""
Receive deltaQ value
:param dq: q fringe width in 1/A unit
"""
# set dq
self.deltaq = dq
[docs] def get_deltaq(self):
"""
return deltaQ value in 1/A unit
"""
# return dq
return self.deltaq
[docs] def compute_thickness(self):
"""
Calculate thickness.
:return: the thickness.
"""
# check if it is float
try:
dq = float(self.deltaq)
except:
return None
# check if delta_q is zero
if dq == 0.0 or dq is None:
return None
else:
# calculate thickness
thickness = 2*pi/fabs(dq)
# return thickness value
return thickness
[docs] def get_thickness_unit(self):
"""
:return: the thickness unit.
"""
# unit of thickness
return self.thickness_unit