ThermalBloomingWFE

class poppy.ThermalBloomingWFE(abs_coeff, dz, name='Thermal Blooming WFE', v0x=<Quantity 0. m / s>, v0y=<Quantity 0. m / s>, cp=<Quantity 1.0049 kJ / (K kg)>, cV=<Quantity 0.7178 kJ / (K kg)>, rho0=<Quantity 1.177 kg / m3>, eta=<Quantity 18.46 s uPa>, p0=<Quantity 101.325 kPa>, T0=<Quantity 300. K>, direction='x', isobaric=False, **kwargs)[source]

Bases: WavefrontError

A thermal blooming phase screen.

Parameters:

abs_coeffastropy.quantity: Aerosol absorption coefficient (m^-1).
dzastropy.quantity: Propagation distance (m).
v0xastropy.quantity: x-component of ambient wind velocity (m.s^-1).
v0yastropy.quantity: y-component of ambient wind velocity (m.s^-1).
cpastropy.quantity: Specific isobaric heat capacity (J.kg^-1.K^-1).
cVastropy.quantity: Specific isochore heat capacity (J.kg^-1.K^-1).
rho0astropy.quantity: Ambient mass density (kg.m^-3).
etaastropy.quantity: Dynamic viscosity (Pa.s).
p0astropy.quantity: Ambient pressure (Pa).
T0astropy.quantity: Ambient temperature (K).
directionstring: Direction of wind velocity. Must be one of ‘x’ or ‘y’. The direction affects the calculation results if isobaric=True.
isobaricbool: Whether to use the isobaric approximation.

Notes

Initial values are those for dry air at room temperature, taken from: https://www.engineeringtoolbox.com/dry-air-properties-d_973.html

Methods Summary

`get_opd`(wave)	Returns an optical path difference for a thermal blooming phase screen (m^-1).
`nat_conv_vel`(wave)	Approximation for natural convection velocity (m.s^-1).
`rho`(wave)	Top-level routine to calculate density changes (kg.m^-3).
`rho_dot_FT`(wave)	Fourier transform of the derivative of the non-isobaric density variation (unit?).
`rho_isobaric`(wave)	Isobaric density variation (kg.m^-3).
`rho_nonisobaric`(wave)	Non-isobaric density variations (kg.m^-3).

Methods Documentation

get_opd(wave)[source]

Returns an optical path difference for a thermal blooming phase screen (m^-1).

Parameters:

wavepoppy.PhysicalFresnelWavefront: Wavefront to calculate the phase screen for.

References

Fleck, J. A., Jr, Morris, J. R. & Feit, M. D. Time-dependent propagation of high energy laser beams through the atmosphere. Appl. Phys. 10, 129–160 (1976).

Fleck, J. A., Jr, Morris, J. R. & Feit, M. D. Time-dependent propagation of high-energy laser beams through the atmosphere: II. Appl. Phys. 14, 99–115 (1977).

nat_conv_vel(wave)[source]

Approximation for natural convection velocity (m.s^-1).

Parameters:

wavepoppy.PhysicalFresnelWavefront: Wavefront to calculate the natural convection velocity for.

References

Smith, D. C. High-power laser propagation: Thermal blooming. Proc. IEEE 65, 1679–1714 (1977).

rho(wave)[source]

Top-level routine to calculate density changes (kg.m^-3).

Parameters:

wavepoppy.PhysicalFresnelWavefront: Wavefront to calculate the density changes for.

rho_dot_FT(wave)[source]

Fourier transform of the derivative of the non-isobaric density variation (unit?).

Parameters:

wavepoppy.PhysicalFresnelWavefront: Wavefront to calculate the density changes for.

References

Fleck, J. A., Jr, Morris, J. R. & Feit, M. D. Time-dependent propagation of high-energy laser beams through the atmosphere: II. Appl. Phys. 14, 99–115 (1977).

rho_isobaric(wave)[source]

Isobaric density variation (kg.m^-3).

Parameters:

wavepoppy.PhysicalFresnelWavefront: Wavefront to calculate the density changes for.

References

Fleck, J. A., Jr, Morris, J. R. & Feit, M. D. Time-dependent propagation of high energy laser beams through the atmosphere. Appl. Phys. 10, 129–160 (1976).

rho_nonisobaric(wave)[source]

Non-isobaric density variations (kg.m^-3).

Parameters:

wavepoppy.PhysicalFresnelWavefront: Wavefront to calculate the density changes for.

References

Fleck, J. A., Jr, Morris, J. R. & Feit, M. D. Time-dependent propagation of high-energy laser beams through the atmosphere: II. Appl. Phys. 14, 99–115 (1977).