commit bcd380db8d3e7637f1a4143d046c3a266bc83cae
parent 2f35b30684ebec7998027e43627de39cf93225a7
Author: Vincent Forest <vincent.forest@meso-star.com>
Date: Tue, 10 Jan 2023 15:11:28 +0100
Update the overview of the README
Add the description of the planetology application
Diffstat:
| M | README.md | | | 30 | +++++++++++++++++++++--------- |
1 file changed, 21 insertions(+), 9 deletions(-)
diff --git a/README.md b/README.md
@@ -12,12 +12,13 @@ the radiation source.
Applications are theoretically possible to any configuration. However, it all
eventually comes down to the possibility of using the physical data of
interest, in their most common formats, in each scientific community. `htrdr`
-is currently suitable for two main application fields:
+is currently suitable for three main application fields:
-1. *Atmospheric radiative transfer*: the clear-sky atmosphere is vertically
- stratified, cloud thermodynamic data is provided on a regular 3D rectangular
- grid, and surface optical properties can be provided for an arbitrary number
- of materials. Internal radiation and solar radiation are taken into account.
+1. *Plane-parallel atmospheric radiative transfer*: a clear-sky atmosphere is
+ vertically stratified, cloud thermodynamic data is provided on 3D
+ rectangular grid, and surface optical properties can be provided for an
+ arbitrary number of materials. Internal radiation and solar radiation are
+ taken into account.
2. *Combustion* processes: thermodynamic data is provided at the nodes of an
unstructured tetrahedral mesh, while surface properties can still be
@@ -25,7 +26,18 @@ is currently suitable for two main application fields:
monochromatic laser sheet illuminates the inside of the combustion chamber
for diagnostic purposes.
-Since any observable radiative transfer is expressed as an integral of the
+3. *Planetology*: takes into account the geometry of a "ground" of arbitrary
+ shape, described by a triangular mesh, with the possibility of using an
+ arbitrary number of materials. The radiative properties of a gas mixture
+ must be provided on a tetrahedral mesh, using the k-distribution spectral
+ model. The radiative properties of an arbitrary number of aerosol modes can
+ also be provided on their individual tetrahedral mesh. Calculations can be
+ made for both internal and external radiation sources. In the case of an
+ external source, a sphere of arbitrary size and position is used. This
+ sphere can radiate as a Planck source at a specified brightness temperature,
+ or using a high-resolution radiance spectrum.
+
+Since any radiative transfer observable is expressed as an integral of the
intensity, and since there is a strict equivalence between the integral to be
solved and the underlying Monte-Carlo algorithm (each integral results in the
sampling of a random variable), the algorithms that calculate the radiance are
@@ -34,10 +46,10 @@ used for computing various quantities:
- *Images* on a camera sensor, in a given field of view. For combustion
applications, only monochromatic images are supported. In atmospheres, both
visible and infrared images are possible: CIE colorimetry is used for visible
- images, while an infrared image is in fact a temperature map of luminosity,
- over the required spectral interval.
+ images, while an infrared image is in fact a temperature map of the brightness
+ temperature over the required spectral interval.
-- *Flux density maps*, on a grid of sensors, integrated over an entire
+- *Flux density maps*, on a sensor grid, integrated over an entire
hemisphere. In the case of combustion chambers, only monochromatic flux maps
can be calculated, while spectrally integrated flux density maps (both on the
visible part of the spectrum and on the infrared) are possible for
