colour.phenomenons Package¶

Sub-Modules¶

Module Contents¶

colour.phenomenons.scattering_cross_section(wavelength, CO2_concentration=300, temperature=288.15, avogadro_constant=6.02214179e+23, n_s=<function air_refraction_index_bodhaine1999 at 0x1032006e0>, F_air=<function F_air_bodhaine1999 at 0x1032009b0>)¶

Returns the scattering cross section per molecule $\sigma$ of dry air as function of wavelength $\lambda$ in centimeters (cm) using given $CO_2$ concentration in parts per million (ppm) and temperature $T[K]$ in kelvin degrees following Van de Hulst (1957) method.

Parameters:	wavelength (numeric) – Wavelength $\lambda$ in centimeters (cm). CO2_concentration (numeric, optional) – $CO_2$ concentration in parts per million (ppm). temperature (numeric, optional) – Air temperature $T[K]$ in kelvin degrees. avogadro_constant (numeric, optional) – Avogadro‘s number (molecules $mol^{-1}$). n_s (object) – Air refraction index $n_s$ computation method. F_air (object) – $(6+3_p)/(6-7_p)$, the depolarisation term $F(air)$ or King Factor computation method.
Returns:	Scattering cross section per molecule $\sigma$ of dry air.
Return type:	numeric

Warning

Unlike most objects of colour.phenomenons.rayleigh module, colour.phenomenons.rayleigh.scattering_cross_section() expects wavelength $\lambda$ to be expressed in centimeters (cm).

Examples

>>> scattering_cross_section(555 * 10e-8)  
4.6613309...e-27

colour.phenomenons.rayleigh_optical_depth(wavelength, CO2_concentration=300, temperature=288.15, pressure=101325, latitude=0, altitude=0, avogadro_constant=6.02214179e+23, n_s=<function air_refraction_index_bodhaine1999 at 0x1032006e0>, F_air=<function F_air_bodhaine1999 at 0x1032009b0>)¶

Returns the rayleigh optical depth $T_r(\lambda)$ as function of wavelength $\lambda$ in centimeters (cm).

Parameters:	wavelength (numeric) – Wavelength $\lambda$ in centimeters (cm). CO2_concentration (numeric, optional) – $CO_2$ concentration in parts per million (ppm). temperature (numeric, optional) – Air temperature $T[K]$ in kelvin degrees. pressure (numeric) – Surface pressure $P$ of the measurement site. latitude (numeric, optional) – Latitude of the site in degrees. altitude (numeric, optional) – Altitude of the site in meters. avogadro_constant (numeric, optional) – Avogadro‘s number (molecules $mol^{-1}$). n_s (object) – Air refraction index $n_s$ computation method. F_air (object) – $(6+3_p)/(6-7_p)$, the depolarisation term $F(air)$ or King Factor computation method.
Returns:	Rayleigh optical depth $T_r(\lambda)$.
Return type:	numeric

Warning

Unlike most objects of colour.phenomenons.rayleigh module, colour.phenomenons.rayleigh.rayleigh_optical_depth() expects wavelength $\lambda$ to be expressed in centimeters (cm).

Examples

>>> rayleigh_optical_depth(555 * 10e-8)  
0.1004070...

colour.phenomenons.rayleigh_scattering(wavelength, CO2_concentration=300, temperature=288.15, pressure=101325, latitude=0, altitude=0, avogadro_constant=6.02214179e+23, n_s=<function air_refraction_index_bodhaine1999 at 0x1032006e0>, F_air=<function F_air_bodhaine1999 at 0x1032009b0>)¶

Returns the rayleigh optical depth $T_r(\lambda)$ as function of wavelength $\lambda$ in centimeters (cm).

Parameters:	wavelength (numeric) – Wavelength $\lambda$ in centimeters (cm). CO2_concentration (numeric, optional) – $CO_2$ concentration in parts per million (ppm). temperature (numeric, optional) – Air temperature $T[K]$ in kelvin degrees. pressure (numeric) – Surface pressure $P$ of the measurement site. latitude (numeric, optional) – Latitude of the site in degrees. altitude (numeric, optional) – Altitude of the site in meters. avogadro_constant (numeric, optional) – Avogadro‘s number (molecules $mol^{-1}$). n_s (object) – Air refraction index $n_s$ computation method. F_air (object) – $(6+3_p)/(6-7_p)$, the depolarisation term $F(air)$ or King Factor computation method.
Returns:	Rayleigh optical depth $T_r(\lambda)$.
Return type:	numeric

Warning

Unlike most objects of colour.phenomenons.rayleigh module, colour.phenomenons.rayleigh.rayleigh_optical_depth() expects wavelength $\lambda$ to be expressed in centimeters (cm).

Examples

>>> rayleigh_optical_depth(555 * 10e-8)  
0.1004070...

colour.phenomenons.rayleigh_scattering_spd(shape=SpectralShape(360, 830, 1), CO2_concentration=300, temperature=288.15, pressure=101325, latitude=0, altitude=0, avogadro_constant=6.02214179e+23, n_s=<function air_refraction_index_bodhaine1999 at 0x1032006e0>, F_air=<function F_air_bodhaine1999 at 0x1032009b0>)¶

Returns the rayleigh spectral power distribution for given spectral shape.

Parameters:	shape (SpectralShape, optional) – Spectral shape used to create the rayleigh scattering spectral power distribution. CO2_concentration (numeric, optional) – $CO_2$ concentration in parts per million (ppm). temperature (numeric, optional) – Air temperature $T[K]$ in kelvin degrees. pressure (numeric) – Surface pressure $P$ of the measurement site. latitude (numeric, optional) – Latitude of the site in degrees. altitude (numeric, optional) – Altitude of the site in meters. avogadro_constant (numeric, optional) – Avogadro‘s number (molecules $mol^{-1}$). n_s (object) – Air refraction index $n_s$ computation method. F_air (object) – $(6+3_p)/(6-7_p)$, the depolarisation term $F(air)$ or King Factor computation method.
Returns:	Rayleigh optical depth spectral power distribution.
Return type:	SpectralPowerDistribution

Examples

>>> rayleigh_scattering_spd()  
<colour.colorimetry.spectrum.SpectralPowerDistribution object at 0x...>