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Questions tagged [infrared-radiation]

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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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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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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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Radiation absorption by CO2 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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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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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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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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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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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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Infrared Radiation mechanism at molecular level

Can anyone tell how objects absorb infrared radiation and get heated up? Like in conduction, because of lattice vibration, the body transfers heat and in microwave, the waves excite the water ...
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1answer
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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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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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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
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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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1answer
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What plastic-like materials allow IR to pass through them?

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
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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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Would a hot metal surface (600 degree Celsius) absorb infrared based laser?

I am trying to design a system to measure the rough dimension of a work piece. However, the work piece has to be measured around 600 degree Celsius. I am considering using a infrared based laser 3D ...
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2answers
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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
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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 ...
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0answers
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Blocking Infrared Signals [closed]

I am currently working on a project that involves infrared signals. This project has an infrared receiver, but I would like for it to receive signals from front side only. For example, if the signal ...
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1answer
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Why does the sun “beat down” harder in the summer - or does it?

I know that seasons are caused by the Earth's axial tilt - in summer, latitudes away from the equator receive more surface irradiance (power per unit area), and vice versa in the winter, because of ...
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1answer
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Is IR radiative cooling of solar cells a valid efficiency improvement?

I am interested in photonics and I stumbled across the following article: https://pubs.acs.org/doi/pdf/10.1021/nl4004283 But is IR radiative cooling really viable? If there's some water in the air, ...
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2answers
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Different methods for measuring intensity of IR wavelengths

I am proposing a teaching experiment at my university for undergraduates to learn about black body radiation and part of it will involve measuring intensities of different near - mid IR wavelengths. ...
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How to block NIR (850 nm) by dry fog or film?

I have several sectors in the large open space which have NIR 850 nm emitters and I should isolate them from each other. There is no way to create doors or walls. Ideally, radiation should be absorbed ...
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1answer
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What is the meaning of IRAS colours?

I came across the term IRAS colors in astronomical papers. What does it mean?
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Fitting of force constants from vibrational frequency

From my understanding, the force constants in a molecule, for example methane, can be fitted using vibrational frequency data from experiment by diagonalising the hessian etc. My confusion lies in ...
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1answer
125 views

Is infrared radiation more easily absorbed than visible light?

Some background: I am curious if infrared lamps used in hatcheries and bathroom fixtures offer any advantage over ordinary incandescent bulbs. A 40 watt bulb produces the same amount of energy, ...
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How much heat (celcius) is needed for infrared midwave to be made?

I'm wondering what the core temperature of an infrared lamp needs to be, for it to start producing infrared heat in the mid-wave spectrum. Thanks!
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2answers
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What is the difference between photoconductive and photovoltaic detectors?

What is the main difference between photoconductive (PC) and photovoltaic (PV) detectors? I notice that PC detectors are typically AC coupled (requiring modulation of the light source to generate a ...
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2answers
952 views

How is it I can see the infrared Face ID on my iPhone X? [closed]

I’ve tried using Face ID in the dark on my new iPhone X and I can very clearly see the infrared flood Illuminator light up as well as the infrared dot projector. Is it possible for humans to see ...
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4answers
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Would placing a polarized sunglass lens in front of an IR thermometer double its max temperature measurement?

I have been doing some backyard metal casting, mostly aluminum. My IR thermometer will only read up to 1000F. Aluminum has a melting point of around 1250F and should be poured around 1350F. I've ...
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2answers
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Do all materials get warmed by the sun, or do there exist materials which reflect the major part of the IR radiation?

Once upon a time, on a hot day, (in a country far, far away, where the internet doesn't exist) I was wondering when I felt that all things around me on which the sun shined were feeling warm: Do all ...
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1answer
44 views

Relating to IR rays [duplicate]

I am working on a project where I am putting an IR sensor similar to what we use IR module for Arduino.I just want a material that can pass the IR rays but it should be opaque to visible eyes .Like ...
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1answer
56 views

Do higher frequency/energy levels in the EM spectrum mean higher temperatures?

I am trying to find concrete evidence that for example, light in the optical spectrum would be hotter than infrared light because it has a higher frequency, and that is directly proportional to energy....
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GW170817 optical and infrared light

I'm reading about GW170817 in various research articles. One of them, The X-ray counterpart to the gravitational-wave event GW170817. E. Troja et al. Nature 551, 71 (2017), arXiv:1710.05433 ...
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1answer
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How does camera capture infrared rays? [duplicate]

Our remote control works on infrared ray. What I had done is placing the diode towards the mouth of the camera and pressed the remote control. I saw a purple light blinked less than one second. Some ...
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Device for measuring scour depth in a laboratory flume carrying water using Infra-red sensors

I have to make a device for measuring scour-depth in a laboratory flume carrying water discharge. Can I efficiently do so by using infra-red sensors? If yes, how?
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229 views

Comparing Radiance to Irradiance

I'm trying to analyze solar radiation to determine ground methane concentrations using IMAP-DOAS (Example Paper). Essentially, I'm comparing modeled irradiance to the radiances gathered from AVIRIS-...
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279 views

FTIR baseline subtraction - how to do this properly?

I am trying to flatten my FTIR spectrum, however I have no Idea how to treat the far-left peak. The spectrum tends to go up in that direction, so in the variant no.1 (see attached picture) I'm trying ...
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3answers
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Why can a regular infrared camera not show temperature (thermography)?

There are a lot of questions here dealing with infrared cameras and thermographic cameras. I think I understand the reason why a thermographic camera is able to retrieve the temperature values from ...
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1answer
35 views

How Can I Observe the Refraction of Infrared Waves?

It is my plant to propagate infrared and place a certain barrier in front of it. How would I go about observing the behaviour of the waves after passing this barrier?
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Reason for using infrared for capturing cosmic images

Why is infrared used to capture the images of distant galaxies? I came to know that due to its higher wave length, it could penetrate easily through the mighty dust of the cosmos out of which ...
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4answers
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Is it possible to create glass that is impassible to infrared radiation?

I read an article today about how UPS has covered some of their trucks with frosted glass to allow drivers to see and find their packages with greater ease. However, one of the drivers noted the ...
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1answer
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Can our emitted infrared light turn on the TV?

We know that TV can be turned on with infrared light and we know that our body emits infrared to. Does the frequency of our emitted infrared corresponds to the frequency of the device that turns on ...
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1answer
48 views

What form of energy creates heat during combustion?

We know that energy is released during oxidation but it is not clear what form it takes initially. I read the energy of chemical bonds of the fuel is not much different from that of the product, so it ...
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1answer
80 views

OPTICS: How to determine whether a material is opaque at 10.6 μm

I'm building a laser cutter/engraver using a 40W CO2 laser, and I want to provide a window in the case so I can monitor things when the laser is on. I have various sheets of transparent plastic, but ...
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1answer
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Is long wave electromagnetic radiation hot? If so, why?

Both infrared radiation and microwaves warms up objects it meets, so therefore I wonder, is all long wave electromagnetic radiation hot? And if it is, why?
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Why The Phase of Electic field of a wave is defined like this?

$$ E_x = E_0 \cos(\omega t - k z + \phi_0) $$ $$ \phi = \omega t - k z + \phi_0 $$ Why do we need $kz$ in this equation?
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If longer wavelengths propagate further, why does infrared contribute to global warming instead of going through clouds?

Maybe I am not understanding something simple, but longer wavelengths go through things easier correct? So why is it that infrared heat is REFLECTED by the clouds and contributes to global warming? ...
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Does something that glows red emit more heat than something equally hot that isn't glowing?

Watching carbon-ceramic brakes on race cars on YouTube got me started. Heat something and its temperature will go up, the hotter is gets, the higher the frequency of the energy it emits, and so ...