Questions tagged [infrared-radiation]
A region of the electromagnetic radiation spectrum where wavelengths range from about 700 nm to 1mm
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Is there a substance which can pass both IR and UV radiations?
I have been thinking about this for a while. A quartz prism allows UV Radiation to pass. A rock salt prism allows IR radiation to pass. Glass absorbs both.
Is there something, that is, a substance to ...
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The absorption of infrared light for regular materials, like fabric wallets backpacks and clothes
I work as a brand partner for a company that produces a patch which strengthens the production of stemcells in the body.
The patches are activated with the help of the bodys own infrared radiation.
I ...
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Why is my pyrgeometer calibrated as if it has $a >1$ emissivity?
I've acquired an SL-510-SS upward-looking pyrgeometer.
In the manual it gives the formula for how to compute the downwelling infrared it picks up:
Clearly the $k_2$ coefficient is the emissivity of ...
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Does anyone know of a molecule or material that has a strong and sharp absorption peak at 2 microns? [closed]
My lab studies quantum imaging, and we are having some (surprising) difficulty finding an interesting (doesn't have to be) molecule or material that has a sharp absorption peak at 2 microns. If anyone ...
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Can very flat surfaces radiate heat in a mostly-perpendicular manner?
What determines the direction (i.e. angle) at which an emitted photon travels? Are very flat surfaces more spatially-coherent (i.e. the photons travel in a parallel manner, akin to a laser beam) or ...
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Does infrared radiation emitted by an object happen only from its surface, or is emission also from the centre of the object?
Textbook answer of how radiation is emitted is from the surface. Does the inside of a object also emit infrared?
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Can infrared light pass through solid materials
I have an IR sensor at about few tens of mm (millimeter) from a heating source (incandescent bulb or heating element). The phototransistor in my sensor is lead lined but I guess it is sensitive to a ...
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Anomaly in Photoelectric effect
Good day.
While doing a physics experiment for a university assignment, I was tasked with measuring the maximum wavelength at which a potassium cathode shined by a monochromatic light emits electrons.
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Will an HVAC vent interfere with an Infrared Sensor?
A 360 degree ceiling mount infrared sensor is to be installed in the center of a small room. An HVAC (heating, ventilation & Air Conditioning) register is located in the ceiling, near the center ...
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What is the influence of humidity on NDIR $\rm CO_2$ measurements?
The Question
I would like to use an NDIR $\rm CO_2$ sensor to measure $\rm CO_2$ in the 0.1-3% range. However, in the course of my experiments, humidity may vary from ambient (50-60%) up to nearly 100%...
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Effect of having infrared reflective paint on a room with and without a heat source
I am trying to check if my understanding is correct. This is not really a question but a request for validation. I hope this is allowed.
When painting with a heat reflective paint there are two ...
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Why does radar have a much longer range than infrared sensors? (in the context of military aircraft)
In the context of military aircraft and missiles, radars often have ranges of hundreds of kilometers, while thermal infrared sensors can only barely reach 100 km in the best of circumstances. But ...
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Are there any material coatings that would currently be effective to counter the rise of directed energy weapons?
I've been reading into directed energy weapons recently, and they seem like they're going to be a gamechanger. I'm just curious as to material countermeasures. I've learnt that some dielectric mirrors ...
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Oscillation in the FTIR spectrum
An FTIR spectrum was measured for me (device from Alignment and MCT Detector) and since I'm not very familiar with FTIR I'm looking for some advice. The absorbance spectrum was obtained by measuring ...
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Larmor precession with an oscillating field?
With a non-polar molecule like CO2, presumably Larmor precession doesn't apply.
However, CO2 has a mode of vibration that induces an oscillating dipole moment.
Could something similar to Larmor ...
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