# -*- coding: utf-8 -*-
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# University of Ljubljana.
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import numpy as np
from .base import RefractiveIndex
[docs]class Ding(RefractiveIndex):
material = 'skin'
def __init__(self, t: float = 295.0):
'''
Refractive index of human skin:
"Huafeng Ding, Phys. Med. Biol.51(2006) 1479–1489,
325 nm - 1557 nm, 22 C"
Parameters
----------
t: float
Default temperature (K) of the medium.
'''
super().__init__(t=t, trange=None, wrange=(325e-9, 1557e-9))
def __call__(self, wavelength: float or np.ndarray,
temperature: float or None = None) -> float or np.ndarray:
'''
Calculate the refractive index of the medium.
Parameters
----------
wavelength: float or np.ndarray
Wavelength of light (m)
temperature: float or None
Use this temperature instead of the default temperature.
Returns
-------
ri: float or np.ndarray
Refractive index at the given wavelength(s).
'''
w = np.asarray(wavelength, dtype=np.float64)
self.check_wavelengths(w)
w = w*1e9
n = 1.3549 + 1.7899e1/w - 3.5938e6/w**3.5
if isinstance(wavelength, float):
n = float(n)
return n
ding = Ding()
default = ding