mars::PressureConversion Class Reference

#include </home/runner/work/mars_lib/mars_lib/source/mars/include/mars/sensors/pressure/pressure_conversion.h>

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Public Types
typedef Eigen::Matrix< double, 1, 1 >	Matrix1d

Public Member Functions
	PressureConversion ()=default
	Default constructor for creating a PressureConversion object.
	PressureConversion (Pressure pressure)
	Detailed constructor to set also the pressure reference.
	PressureConversion (Pressure pressure, MediumPressureOptions gas_options)
	Detailed constructor to set the pressure reference and medium options.
void	set_pressure_reference (Pressure pressure)
	Setter function to set the reference pressure after construction of object.
Matrix1d	get_height (Pressure pressure)
	Converts the given pressure measurement to a height (distance) value.

Private Member Functions
double	get_height_liquid (const Pressure &pressure)
	Converts the given pressure measurement to a height based.
double	get_height_gas (const Pressure &pressure)
	Converts the given pressure measurement to a height based.

Private Attributes
Pressure	reference_
	reference pressure for h=0
MediumPressureOptions	medium_options_
	pressure medium (gas or liquid) options to use
bool	reference_is_set_ { false }
	flag to determine if the reference_ has been set

Member Typedef Documentation

Matrix1d

typedef Eigen::Matrix<double, 1, 1> mars::PressureConversion::Matrix1d

Constructor & Destructor Documentation

PressureConversion() [1/3]

mars::PressureConversion::PressureConversion ( )

default

Default constructor for creating a PressureConversion object.

The medium_options_ are initialized to their default values.

See also

MediumPressureOptions

PressureConversion() [2/3]

mars::PressureConversion::PressureConversion ( Pressure  pressure )

inline

Detailed constructor to set also the pressure reference.

Parameters

pressure

Pressure to set as reference for height = 0.

The medium_options_ are initialized to their default values.

See also

MediumPressureOptions

: PressureConversion(pressure, MediumPressureOptions()){};

PressureConversion() [3/3]

mars::PressureConversion::PressureConversion	(	Pressure	pressure,
		MediumPressureOptions	gas_options
	)

Detailed constructor to set the pressure reference and medium options.

Parameters

pressure	Pressure to set as reference for height = 0.
gas_options	MediumPressureOptions to use

Use this constructor if your medium is different than either air (gas) or water (liquid).

Member Function Documentation

set_pressure_reference()

void mars::PressureConversion::set_pressure_reference

(

Pressure

pressure

)

Setter function to set the reference pressure after construction of object.

Parameters

pressure

Pressure reference to set

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get_height()

Matrix1d mars::PressureConversion::get_height

(

Pressure

pressure

)

Converts the given pressure measurement to a height (distance) value.

Parameters

pressure

Pressure to convert to height

Returns

Matrix1d

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get_height_liquid()

double mars::PressureConversion::get_height_liquid ( const Pressure &  pressure )

private

Converts the given pressure measurement to a height based.

Parameters

pressure

Pressure of type Pressure::Type::LIQUID to convert to height.

Returns

double the height of the measurement

The measurement is converted assuming that the height is directly proportional to the pressure, .i.e,

h = \frac{P}{\rho g},

with P being the measured pressure, \rho the liquid's density, g the gravity at the surface of the liquid, and h the calculated height.

See also

https://en.wikipedia.org/wiki/Pressure#Liquid_pressure

get_height_gas()

double mars::PressureConversion::get_height_gas ( const Pressure &  pressure )

private

Converts the given pressure measurement to a height based.

Parameters

pressure

Pressure of type Pressure::Type::GAS to convert to height.

Returns

double the height of the measurement

The measurement is converted assuming that the height is directly proportional to the pressure, .i.e,

h_start = ((log(P_0) - log(P_sl))*T_0 ) * (R)/(M*g),

h_now = ((log(P) - log(P_sl))*T ) * (R)/(M*g),

h = h_now-h_start,

with P being the measured pressure, P_0 the measured initial pressure (for h=0), P_sl the medium's pressure at sealevel, T the measured temperature, T_0 the measured initial temperature, R the universal gas constant, M the molar mass of the medium, g the gravity at sealevel, and h the calculated height.

See also

https://en.wikipedia.org/wiki/Barometric_formula#Pressure_equations

Member Data Documentation

reference_

Pressure mars::PressureConversion::reference_

private

reference pressure for h=0

medium_options_

MediumPressureOptions mars::PressureConversion::medium_options_

private

pressure medium (gas or liquid) options to use

reference_is_set_

bool mars::PressureConversion::reference_is_set_ { false }

private

flag to determine if the reference_ has been set

{ false };        

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The documentation for this class was generated from the following file:

• pressure_conversion.h