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Questions tagged [infrared-radiation]

A region of the electromagnetic radiation spectrum where wavelengths range from about 700 nm to 1mm

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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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 $CO_2$ 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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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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47 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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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
80 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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377 views

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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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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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
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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 ...