All Questions
Tagged with absorption scattering
24
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What is the range of noon sun color temperature, when a light meter reports full expected sunlight (+/- epsilon)?
My question came from trying to find what uncertainty bounds, if any, I can assign to a color temperature sensor, without access to an artifact with a precisely calibrated output spectrum.
This leads ...
- 11
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Complex Refractive Indices, Absorption, and Transparency
A complex refractive index is defined as $n = n_0 + \kappa$ where $n_0$ is the "standard" refractive index, and $\kappa$ is the optical extinction coefficient. The optical extinction ...
- 203
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23
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Determination of absorption and scattering coefficients, given only the attenuation length
I'm attempting to write a Monte Carlo solution to the radiative transport equation in a highly anisotropic medium with known attenuation length $\lambda$. Due to limitations in our ability to measure ...
- 799
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Why do the 'colors' of liquids in differently sized glass cylinders appear similar despite varying absorption rates?
For some liquids, such as cooking oil, I have observed that when filling two glass cylinders (with lids) of different diameters (e.g., one with a 5 cm diameter and another with a 10 cm diameter) with ...
- 382
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Identifing a formula for the contribution of IR scattering to the permittivity of metals
I'm using a software modelling the complex refractive index of different materials in the THz/far infrared frequency range. One of the parameters that the user can add to the model of the permittivity ...
- 46
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How can daylight have a higher colour temperature (e.g. 6500 K or D65) than sunlight in space?
Supposedly, daylight at midday has a colour temperature of 6500 K. This reference is also the standard for calibrating computer screens (that's how I fell into this). However, outside the atmosphere ...
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How does wavelength affect scattering?
Let's say that I have a detector and a few sources of light (think lightbulbs). The sources are all the same power and emit different colours of light. We're on the surface of Earth.
As I walk further ...
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78
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Difference between photoluminescence spectra, scattering and absorption of light by a nano particle?
If light is incident on a nano-particle, then what are the differences between the phenomena that occurs afterwards such as scattering, absorption and photoluminescence (PL) spectra. Though I know ...
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94
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How do people define the probability of absorption in terms of the size of the universe?
Suppose we are in universe $M$ where we have only a photon $\gamma$ and an hydrogen atom $H$.
Let us define the probability of emission a photon by $P_1$ and the probability of absorption by $P_2$. Is ...
- 445
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Upconversion Particles in Biological Tissues
So I was learning about upconversion particles in biological tissues and understand mainly how they work. UV-Vis light are scattered and absorbed by tissues, so we instead send near-infrared light to ...
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160
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How does the attenuation coefficient of white light in water compare to the attenuation coefficient of monochromatic light in water?
So, from what I understand, different wavelengths of visible light, when shone through water, will have different attenuation coefficients due to scattering and absorption from the water molecules. ...
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What is the difference between scattering and absorption/emission?
As far as I know, scattering occurs when light excites the atoms or molecules to their higher energy state(virtual state for scattering) followed by emitting photons corresponding to energy ...
- 49
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52
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Reduced absorption coefficient question
I came across a paper that reads
It is noteworthy that for a sample without lateral light propagation in the material, i.e. [reduced scattering] $\mu_s' = \infty$ and [absorption] $\mu_a=0$, ...
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523
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How does the reflection coefficient change with scattering and absorption?
My professor of Biomedical Optics course asked us to think upon the evolution of the reflection coefficient with the absorption coefficient $\mu_a$, the reduced scattering coefficient $\mu_s'$ and the ...
- 155
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Are changes in light aborption induced by changes in medium concentration multiplicative with light intensity?
I'm working in the area of near-infrared spectroscopy where we shine light through tissue and measure the attenuation at a detector nearby. The detector is actually placed on the same surface as the ...
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