"""
This module is a small tool to allow user to
control instrumental parameters
"""
import numpy
# defaults in cgs unit
_SAMPLE_A_SIZE = [1.27]
_SOURCE_A_SIZE = [3.81]
_SAMPLE_DISTANCE = [1627, 0]
_SAMPLE_OFFSET = [0, 0]
_SAMPLE_SIZE = [2.54]
_SAMPLE_THICKNESS = 0.2
_D_DISTANCE = [1000, 0]
_D_SIZE = [128, 128]
_D_PIX_SIZE = [0.5, 0.5]
_MIN = 0.0
_MAX = 50.0
_INTENSITY = 368428
_WAVE_LENGTH = 6.0
_WAVE_SPREAD = 0.125
_MASS = 1.67492729E-24 # [gr]
_LAMBDA_ARRAY = [[0, 1e+16], [_INTENSITY, _INTENSITY]]
[docs]class Aperture(object):
"""
An object class that defines the aperture variables
"""
def __init__(self):
# assumes that all aligned at the centers
# aperture_size [diameter] for pinhole, [dx, dy] for rectangular
self.sample_size = _SAMPLE_A_SIZE
self.source_size = _SOURCE_A_SIZE
self.sample_distance = _SAMPLE_DISTANCE
[docs] def set_source_size(self, size=[]):
"""
Set the source aperture size
"""
if len(size) == 0:
self.source_size = 0.0
else:
self.source_size = size
validate(size[0])
[docs] def set_sample_size(self, size=[]):
"""
Set the sample aperture size
"""
if len(size) == 0:
self.sample_size = 0.0
else:
self.sample_size = size
validate(size[0])
[docs] def set_sample_distance(self, distance=[]):
"""
Set the sample aperture distance
"""
if len(distance) == 0:
self.sample_distance = 0.0
else:
self.sample_distance = distance
validate(distance[0])
[docs]class Sample(object):
"""
An object class that defines the sample variables
"""
def __init__(self):
# assumes that all aligned at the centers
# source2sample or sample2detector distance
self.distance = _SAMPLE_OFFSET
self.size = _SAMPLE_SIZE
self.thickness = _SAMPLE_THICKNESS
[docs] def set_size(self, size=[]):
"""
Set the sample size
"""
if len(size) == 0:
self.sample_size = 0.0
else:
self.sample_size = size
validate(size[0])
[docs] def set_thickness(self, thickness=0.0):
"""
Set the sample thickness
"""
self.thickness = thickness
validate(thickness)
[docs] def set_distance(self, distance=[]):
"""
Set the sample distance
"""
if len(distance) == 0:
self.distance = 0.0
else:
self.distance = distance
if distance[0] != 0.0:
validate(distance[0])
[docs]class Detector(object):
"""
An object class that defines the detector variables
"""
def __init__(self):
# assumes that all aligned at the centers
# source2sample or sample2detector distance
self.distance = _D_DISTANCE
self.size = _D_SIZE
self.pix_size = _D_PIX_SIZE
[docs] def set_size(self, size=[]):
"""
Set the detector size
"""
if len(size) == 0:
self.size = 0
else:
self.size = size
validate(size[0])
[docs] def set_pix_size(self, size=[]):
"""
Set the detector pix_size
"""
if len(size) == 0:
self.pix_size = 0
else:
self.pix_size = size
validate(size[0])
[docs] def set_distance(self, distance=[]):
"""
Set the detector distance
"""
if len(distance) == 0:
self.distance = 0
else:
self.distance = distance
validate(distance[0])
[docs]class Neutron(object):
"""
An object that defines the wavelength variables
"""
def __init__(self):
# neutron mass in cgs unit
self.mass = _MASS
# wavelength
self.wavelength = _WAVE_LENGTH
# wavelength spread (FWHM)
self.wavelength_spread = _WAVE_SPREAD
# wavelength spectrum
self.spectrum = self.get_default_spectrum()
# intensity in counts/sec
self.intensity = numpy.interp(self.wavelength,
self.spectrum[0],
self.spectrum[1],
0.0,
0.0)
# min max range of the spectrum
self.min = min(self.spectrum[0])
self.max = max(self.spectrum[0])
# wavelength band
self.band = [self.min, self.max]
# default unit of the thickness
self.wavelength_unit = 'A'
[docs] def set_full_band(self):
"""
set band to default value
"""
self.band = self.spectrum
[docs] def set_spectrum(self, spectrum):
"""
Set spectrum
:param spectrum: numpy array
"""
self.spectrum = spectrum
self.setup_spectrum()
[docs] def setup_spectrum(self):
"""
To set the wavelength spectrum, and intensity, assumes
wavelength is already within the spectrum
"""
spectrum = self.spectrum
intensity = numpy.interp(self.wavelength,
spectrum[0],
spectrum[1],
0.0,
0.0)
self.set_intensity(intensity)
# min max range of the spectrum
self.min = min(self.spectrum[0])
self.max = max(self.spectrum[0])
# set default band
self.set_band([self.min, self.max])
[docs] def set_band(self, band=[]):
"""
To set the wavelength band
:param band: array of [min, max]
"""
# check if the wavelength is in range
if min(band) < self.min or\
max(band) > self.max:
raise
self.band = band
[docs] def set_intensity(self, intensity=368428):
"""
Sets the intensity in counts/sec
"""
self.intensity = intensity
validate(intensity)
[docs] def set_wavelength(self, wavelength=_WAVE_LENGTH):
"""
Sets the wavelength
"""
# check if the wavelength is in range
if wavelength < min(self.band) or\
wavelength > max(self.band):
raise
self.wavelength = wavelength
validate(wavelength)
self.intensity = numpy.interp(self.wavelength,
self.spectrum[0],
self.spectrum[1],
0.0,
0.0)
[docs] def set_mass(self, mass=_MASS):
"""
Sets the wavelength
"""
self.mass = mass
validate(mass)
[docs] def set_wavelength_spread(self, spread=_WAVE_SPREAD):
"""
Sets the wavelength spread
"""
self.wavelength_spread = spread
if spread != 0.0:
validate(spread)
[docs] def get_intensity(self):
"""
To get the value of intensity
"""
return self.intensity
[docs] def get_wavelength(self):
"""
To get the value of wavelength
"""
return self.wavelength
[docs] def get_mass(self):
"""
To get the neutron mass
"""
return self.mass
[docs] def get_wavelength_spread(self):
"""
To get the value of wavelength spread
"""
return self.wavelength_spread
[docs] def get_ramdom_value(self):
"""
To get the value of wave length
"""
return self.wavelength
[docs] def get_spectrum(self):
"""
To get the wavelength spectrum
"""
return self.spectrum
[docs] def get_default_spectrum(self):
"""
get default spectrum
"""
return numpy.array(_LAMBDA_ARRAY)
[docs] def get_band(self):
"""
To get the wavelength band
"""
return self.band
[docs] def plot_spectrum(self):
"""
To plot the wavelength spactrum
: requirment: matplotlib.pyplot
"""
try:
import matplotlib.pyplot as plt
plt.plot(self.spectrum[0], self.spectrum[1], linewidth=2, color='r')
plt.legend(['Spectrum'], loc='best')
plt.show()
except:
raise RuntimeError, "Can't import matplotlib required to plot..."
[docs]class TOF(Neutron):
"""
TOF: make list of wavelength and wave length spreads
"""
def __init__(self):
"""
Init
"""
Neutron.__init__(self)
#self.switch = switch
self.wavelength_list = [self.wavelength]
self.wavelength_spread_list = [self.wavelength_spread]
self.intensity_list = self.get_intensity_list()
[docs] def get_intensity_list(self):
"""
get list of the intensity wrt wavelength_list
"""
out = numpy.interp(self.wavelength_list,
self.spectrum[0],
self.spectrum[1],
0.0,
0.0)
return out
[docs] def get_wave_list(self):
"""
Get wavelength and wavelength_spread list
"""
return self.wavelength_list, self.wavelengthspread_list
[docs] def set_wave_list(self, wavelength=[]):
"""
Set wavelength list
:param wavelength: list of wavelengths
"""
self.wavelength_list = wavelength
[docs] def set_wave_spread_list(self, wavelength_spread=[]):
"""
Set wavelength_spread list
:param wavelength_spread: list of wavelength spreads
"""
self.wavelengthspread_list = wavelength_spread
[docs]def validate(value=None):
"""
Check if the value is folat > 0.0
:return value: True / False
"""
try:
val = float(value)
if val >= 0:
val = True
else:
val = False
except:
val = False