physics_funcs.cc File Reference

#include <cmath>
#include <stdexcept>
#include "physics_funcs.h"
#include "messages.h"
#include "mystring.h"

Go to the source code of this file.

Functions
Numeric	dinvplanckdI (const Numeric &i, const Numeric &f)
	dinvplanckdI More...
void	fresnel (Complex &Rv, Complex &Rh, const Complex &n1, const Complex &n2, const Numeric &theta)
	fresnel More...
Numeric	invplanck (const Numeric &i, const Numeric &f)
	invplanck More...
Numeric	invrayjean (const Numeric &i, const Numeric &f)
	invrayjean More...
Numeric	number_density (const Numeric &p, const Numeric &t)
	number_density More...
Numeric	planck (const Numeric &f, const Numeric &t)
	planck More...
Numeric	rayjean (const Numeric &f, const Numeric &t)
	rayjean More...

Variables
const Numeric	BOLTZMAN_CONST
const Numeric	DEG2RAD
const Numeric	PLANCK_CONST
const Numeric	SPEED_OF_LIGHT

Detailed Description

Author

Patrick Eriksson Patri.nosp@m.ck.E.nosp@m.rikss.nosp@m.on@r.nosp@m.ss.ch.nosp@m.alme.nosp@m.rs.se

Date

2002-05-08

This file contains the code of functions of physical character. Modified by Claudia Emde (2002-05-28).

Definition in file physics_funcs.cc.

Function Documentation

dinvplanckdI()

Numeric dinvplanckdI	(	const Numeric &	i,
		const Numeric &	f
	)

dinvplanckdI

Calculates the derivative of inverse-Planck with respect to intensity.

Returns

The derivative

Parameters

i	radiance
f	frequency

Author

Patrick Eriksson

Date

2010-10-26

Definition at line 71 of file physics_funcs.cc.

References BOLTZMAN_CONST, PLANCK_CONST, and SPEED_OF_LIGHT.

Referenced by apply_y_unit2().

fresnel()

void fresnel	(	Complex &	Rv,
		Complex &	Rh,
		const Complex &	n1,
		const Complex &	n2,
		const Numeric &	theta
	)

fresnel

Calculates complex AMPLITUDE reflection coeffcients for a specular reflection

The properties of the two involved media are given as the complex refractive index, n. A dielectric constant, eps, is converted as n = sqrt( eps ). The power reflection coefficient, r, for one polarisation is r = abs(R)^2.

Parameters

Rv	Out: Reflection coefficient for vertical polarisation
Rh	Out: Reflection coefficient for vertical polarisation
n1	In: Refractive index of medium where radiation propagates
n2	In: Refractive index of reflecting medium
theta	In: Propagation angle from normal of radiation to be reflected

Author

Patrick Eriksson

Date

2004-09-21

Definition at line 110 of file physics_funcs.cc.

References DEG2RAD.

Referenced by surfaceFlatRefractiveIndex().

invplanck()

Numeric invplanck	(	const Numeric &	i,
		const Numeric &	f
	)

invplanck

Converts a radiance to Plack brightness temperature.

Returns

Planck brightness temperature

Parameters

i	radiance
f	frequency

Author

Patrick Eriksson

Date

2002-08-11

Definition at line 142 of file physics_funcs.cc.

References BOLTZMAN_CONST, PLANCK_CONST, and SPEED_OF_LIGHT.

Referenced by apply_y_unit().

invrayjean()

Numeric invrayjean	(	const Numeric &	i,
		const Numeric &	f
	)

invrayjean

Converts a radiance to Rayleigh-Jean brightness temperature.

Returns

RJ brightness temperature

Parameters

i	radiance
f	frequency

Author

Patrick Eriksson

Date

2000-09-28

Definition at line 170 of file physics_funcs.cc.

References BOLTZMAN_CONST, and SPEED_OF_LIGHT.

Referenced by apply_y_unit(), apply_y_unit2(), doit_conv_flagAbsBT(), doit_conv_flagLsq(), iyMC(), MCGeneral(), and MCIPA().

number_density()

Numeric number_density	(	const Numeric &	p,
		const Numeric &	t
	)

number_density

Calculates the atmospheric number density.

Returns

number density

Parameters

p	pressure
t	temperature

Author

Patrick Eriksson

Date

2000-04-08

Definition at line 195 of file physics_funcs.cc.

References BOLTZMAN_CONST.

Referenced by abs_coefCalcFromXsec(), calc_nd_field(), GasAbsLookup::Extract(), and vmrunitscf().

planck()

Numeric planck	(	const Numeric &	f,
		const Numeric &	t
	)

planck

Calculates the Planck function for a single temperature.

Note that this expression gives the intensity for both polarisations.

Returns

blackbody radiation

Parameters

f	frequency
t	temperature

Author

Patrick Eriksson

Date

2000-04-08

Definition at line 219 of file physics_funcs.cc.

References BOLTZMAN_CONST, PLANCK_CONST, and SPEED_OF_LIGHT.

Referenced by cloud_ppath_update1D_planeparallel(), cloud_RT_no_background(), emissionPlanck(), MatrixCBR(), MatrixPlanck(), MCGeneral(), MCIPA(), surface_specular_R_and_b(), surfaceBlackbody(), surfaceFlatReflectivity(), surfaceFlatVaryingEmissivity(), and surfaceLambertianSimple().

rayjean()

Numeric rayjean	(	const Numeric &	f,
		const Numeric &	t
	)

rayjean

Converts a Rayleigh-Jean brightness temperature to radiance

Returns

radiance

Parameters

tb	RJ brightness temperature
f	frequency

Author

Patrick Eriksson

Date

2011-07-13

Definition at line 252 of file physics_funcs.cc.

References BOLTZMAN_CONST, and SPEED_OF_LIGHT.

Referenced by iyInterpCloudboxField(), and iyInterpPolyCloudboxField().

Variable Documentation

BOLTZMAN_CONST

const Numeric BOLTZMAN_CONST

extern

Referenced by dinvplanckdI(), invplanck(), invrayjean(), number_density(), planck(), and rayjean().

DEG2RAD

const Numeric DEG2RAD

extern

Referenced by fresnel().

PLANCK_CONST

const Numeric PLANCK_CONST

extern

Referenced by dinvplanckdI(), invplanck(), and planck().

SPEED_OF_LIGHT

const Numeric SPEED_OF_LIGHT

extern

Referenced by dinvplanckdI(), invplanck(), invrayjean(), planck(), and rayjean().