Questions tagged [infrared-radiation]
A region of the electromagnetic radiation spectrum where wavelengths range from about 700 nm to 1mm
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How can atmospheric $CO_2$ absorption of infrared be 100% when its atmospheric concentration is 0.04%?
An absorption spectrum from high in the atmosphere of infrared radiation emitted from the earth, shows that for the 15µm wavelength there is almost complete absorption. This is attributed to ...
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25 views
Can radiators cool down using only back body radiation?
If you could produce a very thin tube, say less than the thickness of a human hair, designed to carry a hot liquid inside, the diameter is small so that the liquid would have a high surface area to ...
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What processes permit (presumed) emission by, but prohibit absorption of, IR photons by non-greenhouse gas molecules?
It is said that because of bond-structures / possible vibrational states, non-greenhouse-gases / homonuclear diatomics cannot absorb IR.
Presumably there is no question that all gases, being matter, ...
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1answer
82 views
Understanding radiation of objects
I am trying to understand Greenhouse effect. I have heard that during the day the earth absorbs heat from the sun and during the night it looses heat in the form of infrared radiation.
Does earth ...
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39 views
Experimental Calculating Optical Lens for Temperature IR Sensor. (heat emitting 20x20cm object in a distance from 13cm)
I need to calculate online heating temperature of thermoplastic by the MLX90614 IR Sensor shown blow:
used in one Vacuum former device.
As you can see i need to calculate the thermal plastic ...
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1answer
24 views
Geometric optics in the (early) far infrared
I'm looking into thermal radiation from hot glass, in particular I'd like to compute the angular and spectral distribution of radiation from borosilicate glass as a function of its temperature.
I am ...
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1answer
50 views
Sci-Fi weapon: Satellite shooting laser beams down to earth? [closed]
The range of one of these is stated to be 700m. Since it sends out electromagnetic waves the only problem I see with limited range is the beam divergence. Atmospheric absorption is minimal so slapping ...
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1answer
49 views
Does far infrared penetrate smoke better than near ir?
I assume it would, but the EU's Sentinel-2 satellite uses near-ir instead....
Just wondering why.... And which wavelengths penetrate smoke (not fog) the best....
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1answer
41 views
If I have an IR source, would glass lenses work in focusing them at a point?
So I'm using near-infrared light of the wavelength of order 700-800 nm. I need it focused at one point. I was wondering if using glass lenses would do the job or not?
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I'm working on a project with infrared light and I need materials that are transparent to IR light
I'm going to be using infrared light of wavelength somewhere around $700-800 \space \text{nm}$ and I need cheap materials that can be easily found/bought which are transparent to infrared light.
It ...
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2answers
74 views
Painting a vehicle black to avoid radar detecion: a bad idea?
A lot of people on the Radar Detector & Laser Jammer Forum are trying to paint their cars in the deepest black to avoid getting a speed ticket by making their vehicle stealthier for incoming radar ...
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Detecting how bright is the sun using a photodiode [closed]
Basically I'm trying to control the moment when I turn on the lights using a photodiode. Let's say when the sun illuminance is 10lx, the photodiode will read a given value in $\frac{W}{cm^2}$. Given ...
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A Cheap Way for Seeing 1000nm to 1600nm Light
I have started a project in infrared where the spectrum covers 1000nm to 1600nm. A silicon based image sensors can see up to about 1000nm, while an iPhone attached FLIR camera can see from 8 – 14 µm, ...
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2answers
62 views
What type of lens is used to collimate light?
I am interested in collimating infrared LEDs, but I don't know what type of lens to use (eg, concave or convex). Can someone tell me what type of lens to use? I am trying to collimate a regular IR LED ...
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1answer
57 views
Would 2 people wearing identical night vision goggles be able to see each other from afar? [closed]
From what I understand, this is how night vision goggles (NVGs) function:
The environment is illuminated by forward facing IR LEDs.
A portion of the light bouncing off of the scene passes through an ...
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How do I measure the (near) infra-red radiation intensity?
I need to measure how much of the radiation is absorbed by a specific fabric (as in "what percentage of photons is absorbed"). I am interested in 2 LEDs: 650nm (red) and 800nm (infra-red).
The ...
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1answer
35 views
What materials allow $12\,\mathrm{\mu m}$ LWIR to pass?
What commonly available materials will allow Infrared Radiation with wavelength of $12\,\mathrm{\mu m}$ to pass through?
Commonly available is something that can be obtained easily for manufacturing....
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1answer
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How is infrared light created? [duplicate]
All mass with a temperature creates infrared light, but what is the cause of this? How is it created?
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33 views
Remote control devices via infra-red light from our bodies
We can remote control devices via infra-red light.
This light also radiate every living organism.
If we could control our radiation, could we remote control these devices?
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2answers
70 views
Refraction of light with destructive interference
The wavelength of light determines it's refraction in a prism.
But, what if two beams of light destructively interfere as they pass through a small prism, so there is no apparent wave or wavelength ...
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1answer
31 views
How many degrees Celsius/Fahrenheit can be reached in 1 square meter area using magnifying glasses?
The magnifying glasses are each 10 meters in diameter, their collected light is concentrated via mirrors into a 1 square meter spot. Is it possible to get a temperature higher than 2000 degrees ...
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0answers
47 views
What are common materials that absorb near infrared radiation?
I am running an experiment in my university lab where I want to compare with a sensor how much IR radiation gets transmitted in different scenarios. I need some (preferably common) materials that ...
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1answer
38 views
Infrared pass material thermal camera
I have a situation in which I need to use a thermal camera in a rain enviroment, the camera is mounted on a gymbal and can rotate 360 degrees, so I tought it may be an option to build a dome in order ...
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2answers
70 views
How can I recreate the greenhouse effect in my car? [closed]
I am trying to preheat my car during winter mornings using the greenhouse effect. I understand the greenhouse effect in cars works by visible light passing through the glass, with most UV and infrared ...
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1answer
29 views
Is there a glossary about which infrared (IR) colors which body parts reflect?
I am doing medical research and I'm trying to find parts of the body that look about the same to the human eye, but reflect different "colors" in IR, so that using a light source and a camera of that ...
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0answers
84 views
DIY IR spectrometry - stray light (higher orders diffraction maxima)
Context: homemade IR spectrometer with diffraction grating.
Since
$$m \lambda = d \sin \Theta _{m}$$
diffraction maxima of higher orders from shorter wavelengths will be mixed with lower order ...
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1answer
215 views
To what extent is the heat in the focal point due to visible light?
When focusing sunlight on a piece of paper, e.g. with magnifying glass, the paper will be charred and might eventually even burn (assuming low cloudiness). To what extent is the heat a result of the ...
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2answers
71 views
Do you feel the radiated heat of an explosion before you see it?
Do the infra-red rays reach us before the visible light does. I understand they have different wavelength but I don't know much else. Please answer the question if the explosion was in air and if it ...
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1answer
324 views
What material does not reflect infrared light
I have a Clever Dog camera pointing outside through a window, with Infrared light being used at night. The camera light is reflected through the window and affects the image quality. I tried placing a ...
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3answers
95 views
Am I right about IR vision?
I watched Kyle's Because Science video on The Predator and 1 thing he talked about was IR vision. Here was his argument:
If you can see nothing but infrared light, you can only see the ambient ...
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0answers
6 views
Tourmaline-Laden Ceramics in Hair-Care Products
I have seen a great deal of hype for hair care products in which the ceramic of any part of the product (barrels of hairbrushes (particularly the cylindrical blowdrying brushes), heating elements of ...
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1answer
53 views
how to estimate the error of FTIR spectra?
how to estimate the error of FTIR spectra in transmission, especially on the wavenumber ? please
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2answers
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Help with reflectance measurement of Infrared
This is a elementary question that troubles me.
My understanding is that biological tissue absorbs and transmit light in the infrared region.
How is that a sensor is able to detect temperature from ...
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1answer
35 views
Materials and infrared images
I don't know much about infrared waves so I was hoping someone could point me to the right direction..
I'm currently playing around with a Microsoft Kinect v2 sensor which can take depth and infrared ...
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2answers
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Why a metallic mirror temperature cannot be read by a thermal camera?
When I look at a first surface mirror with a thermal camera I don't see the temperature of the mirror but the temperature of the reflected objects. It is like if a polished metallic surface don't lose ...
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2answers
514 views
Common materials that reflect and absorb near infrared radiation
Recently I got into an infrared (IR) photography using a modified DSLR in which the IR cut filter in front of the camera sensor has been removed. According to astrosurf.com the usual sensitivity of ...
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2answers
270 views
Radiation absorption by $CO_2$ molecule in atmosphere
What kind of radiation (light) does CO2 molecule absorb -UV or IR? I've read that it's infrared however some sources suggest ultraviolet. If so, how might it be possible?
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2answers
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Blocking of infrared radiation from the sun by $\rm CO_2$ [duplicate]
Why is the infrared heat from the sun not prevented from entering the earth's atmosphere by $\rm CO_2$ to the same extent that it is prevented from leaving the Earth's atmosphere?
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4answers
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Why don't we use infrared light to heat food?
Why don't we use infrared (IR) or even the far IR just to heat food in a microwave oven instead of, of course, the conventional 2.45 GHz microwaves? Don't people call IR heat waves?
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1answer
37 views
How does an IR camera determine the temperature?
The IR cameras detect light in the IR where low temperature bodies (-20 - 40 deg) have their peaks of the black body radiance.
How the detectors associate temperature to intensity measurement on a ...
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1answer
58 views
How does silver affect transmission of energy in the visible and infrared part of the spectrum?
A common method to prevent radio frequency and microwave energy from going through windows is to apply a microscopic layer of silver to the surface of the glass, either by attaching a film coated with ...
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1answer
53 views
What are the types of infrared scattering?
There are various types of scattering of electromagnetic wave. what type of scattering involves infrared electromagnetic wave?
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1answer
59 views
Which parts of the electromagnetic spectrum are difficult to image with? [closed]
Alternately stated question: What parts of the electromagnetic spectrum can't be used in traditional imaging techniques, and why not?
By 'traditional' I specifically mean using a lens (or some '...
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2answers
465 views
Is there a way to make infrared pass through metals?
I am curious to know a way that will make infrared pass through metals. Metals are good reflectors of infrared,can we manipulate the wave in order to make them pass through metals?.
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1answer
289 views
Why radio waves can pass through walls but not infrared waves?
My physics teacher told that infrared waves are not passing through walls due to rayleigh scattering,but rayleigh scattering increases with increase in wavelength,then why radio waves are passing ...
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2answers
484 views
Can Thermal cameras see through walls?
I saw this cod black ops 4 cod is based on realistic gameplay, so i am curious if thermal cameras really can do that? i think this may be a possibility if the sensors are highly sensitive and can ...
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2answers
3k views
What plastic-like materials allow IR to pass through them? [closed]
What plastic-like materials allow IR to pass through them?
Material should be solid and plastic like. Does't care if it is transparent to light or not.
IR ray is emitted by Sharp distance center so it ...
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0answers
50 views
How does a microbolometer array resolve temperature?
I'm told that handheld thermal sensors measure black body radiation with a bolometer array.
I don't understand how ones goes from IR photon counts to temperature. Is the camera somehow spectrally ...
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2answers
542 views
Why walls are blocking infrared waves? If bricks absorbs only certain infrared frequency as shown in the infrared absorption spectroscopy graph below
link to the pdf
I am told that infrared is reflected(blocked) by wall. my argument is,how can they reflect a photon if they don't absorb it.as you know infrared is absorbed by molecule which has same ...
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3answers
232 views
Why can I see the glow from my TV remote's LED if it is supposed to emit in the infrared?
The TV remote light emissions being >700nm are supposed to be invisible right? Same goes for proximity sensor on phone and laser focus on phone's back camera.
But how could, me and 3 more people I ...
