Infrared Definition and 226 Threads

I was wondering why only infrared waves are known as heat waves. Electromagnetic waves of all frequencies carry energy and when absorbed by electrons increase the kinetic energy of the electron absorbing the wave. So,the average kinetic energy of the atom of the electrons (thereby temperature)...

If I rubbed my hands together in a dark room (no outside light source), could the heat i produce cause Infrared radiation? Or is the infrared radiation from our bodies dependent on outside radiation?

In my organic lab we recently isolated and crystallized the natural product usnic acid from dried lichen. An IR spectrum of the crystals dissolved in mineral oil was obtained, but it came out looking a bit strange. The thing that's really confusing me is that there is no band that would be...

I know there are some obstacles to overcome, but I'm wondering how good the idea would be in theory. First though, a few sub-questions before the main one: 1: The radiation in a microwave food cooker is like a laser (hence the 'hotspots' in food). Is it possible for microwaves to more...

Hi guys. I have a question. See figure 2.1 in the PDF file, page 13. Basically we have a radiation sensor (sensitive only to infrared light) and we have a light bulb in front of it. We must make some measurement to see that the inverse square law holds and so we must measure the "intensity"...

Hey experts! I've designed an infrared detection circuit to drive a motor, but I need the circuit and my math checked. I tried 5Spice, but I can't get my head around it. Circuit image attached. Do you know about how far I would be able to detect someone crossing in front of the light? I need...

I was thinking about getting my friend one for his bday. Does anyone play around with these? I was thinking he could use it to perfectly cook meats on the grill or test the temperature of a pan to make pancakes, etc. Are they really useful or just overkill that people never end up using if...

Homework Statement for what purpose dodes are used in these projects. http://www.electronickits.com/kit/complete/elec/ck1600.htm http://www.electronics-project-design.com/MotorControl.html http://www.electronics-project-design.com/PIC-Microcontroller-Circuit.html...

How to see infrared...? Does anybody know how to see infrared in naked eye,except digital camera, which means with glass or other material...??

Hello, I have been working on a little thing and I bought 2 Infrared Phototransistors(http://www.radioshack.com/product/index.jsp?productId=2049724"). What is wrong with my circuit? Thanks.

Hi I'm a little bit confused about infrared spectroscopy. My basic understanding (which was obviously wrong) was that molecules absorbed EMR in the infrared region and that this caused vibrations in the molecule. Some vibrations/stretching cause a change in charge distribution and for reasons...

Lower frequency should have an easier time getting through glass than that of visible light. However remote controls for electronic devices to not work when glass is in the way. Then you go down even further into the spectrum to my wireless router and it has no problem going through glass...

Why is a rough surface a good absorber and radiator of infrared?

Hi folks, EM radio signals range in frequencies from a couple Hz up to approximately EHF (30-300GHz)... As we exceed the 300GHz threshold, we begin to approach the infrared section of EM spectrum, and furthermore into the visible light area of the spectrum. My question is, what happens...

Why does long wavelength infrared not penetrate glass?

For an experiment we are doing, we need to be able to accurately detect people inside a car moving at high speed. Any suggestions for an IR/other camera that can help us effectively do it? The car has a hot engine, so I am concerned an IR camera may or may not work. Any thoughts. Cost not a...

If you walked into a cave that led several stories underground, completely cut off by light, would you be able to read a standard textbook you'd carried with you using a set of infrared goggles? Along with a spectrometer? After several days? My guesses are no, in all cases, unless the ink...

Why does glass not permit long wavelength infrared to pass through?

You know those hand held laser gun thermometers , I was reading how they work and it says that the material you point it at is emitting infrared photons , ok so does the gun shoot infrared photons at the material and then they bounce back and it measures the change in energy or does it just...

Homework Statement What is the frequency (in Hz) of infared radiation that has a wavelength of 160.432 micrometers? The speed of light is 3.00 x 108 m/s. Homework Equations Speed of light = wavelength x frequency Speed of light = 3.00 x 10^8 m/s The Attempt at a Solution I know that the...

Why exactly is infrared radiation called the heat signature?

I'm reading about emission spectrums, and my text says that when an iron bar is heated until it's hot and glowing, the "warmth of the glowing bar represents the infrared portion of its emission spectrum". Is it true that radiating heat is associated only with infrared EM waves? ~Jules~

Hello! I've got an IR heater http://roxi.ru/media/user/1243/img_11940_940x720.jpg I've put against the wardrobe in a distance of 2 meters for I want to heat all it's surface. But for an hour of heating I don't feel heating of it's surface. Also I have put my washbasin with water in...

Hello, i have a very basic question about reflection of infrared light. What types of materials will give a diffuse reflection of light in the near IR spectrum (around 850nm)? Is the original wavelength affected by this reflection? thx in advance, michael .

To my mind radio waves are different than light because they are described by fields whose energy is not a function of frequency but just the amplitudes. That they always have to surround their source, and are not uniquely associated with individual particles. Light on the other hand is...

Do all types of light in the radioactive spectrum emit heat? If so, why is infrared the only one associated with heat?

Hi. I want to make an assembly in which when one clicks a switch, it lights an infrared LED for 1/30 of a second. Basically, instead of having a switch and a battery, i use a linear generator as a switch, giving current only when pressed to light LED. Like any linear generators, when one...

Hello, Can any experts give me some advice on the selection and calculation of infrared in control. I want to do a simple sensor control by PLC which utilize the infrared.When the receiver detects the infrared from the transmitter, the signal will trigger the PLC for some form of control...

does shiny aluminum foil reflect infrared photons.

Hello, I am currently doing a project where the PLC will control the actuators based on the infrared signal. Is there any good books that covers everything from theories (basic of infrared),design and application (control)? I tried googled some of the books but the table of contents...

Question regarding the emission of infrared radiation, for personal knowledge. Why do humans emit infrared radiation? Is it because it just so happens that the energy humans absorb (from sunlight)/ the energy humans produce just so happens to correlate to the frequency of infrared, as...

Hey guys, I'm not exactly sure on which forum I should be posting this topic but I decided to post it here. Any mod can move it if deemed necessary. Anyway, I have been wondering about the infrared wavelengths that a remote control emits when trying to control, say, a TV or VCR/DVD player...

Dear Expertor, I'm just newbie in Comsol program, I have project to simulation the infrared radiation heat for the epoxy. So i would like to know how to specific the infrared lamp in Comsol simulation model. Could you please reccomment some book or some sample file of Comsol. Thanks...

Dear Experts, I bought a pair of infrared LEDs (transmitter + receiver). I read that infrared can be used as distance sensor. I have seen projects using it (eg. Sharp GP2D120 sensor) for robotics and toy cars. Just to clarify, I am not using the Sharp sensor but a normal infrared LED...

hi everyone... i have got a general doubt...I have heard that silicon is transparent to infrared...so does that mean that any IR wave entering silicon comes out of it without any change? Is silicon 100% transparent to IR? does the transparency depend on temperature or any other parametre...

In order to detect SARS, airport officials would use infrared cameras to find potential carriers. A healthy individual would be detected to emit 100microwatts at 37C body temperature, what would a sick individual at 40C body temperature emit? With this answer, what is the difference in...

Hey there PF! I'm currently working on building an Infrared Remote to control a series of triacs. The objective is to create a "remote control power bar". The original plan was to use push button switches to toggle the Q lead of a 4013, each of which houses two switching circuits. Q and NOT-Q...

What damage to the body can infrared rays, radar waves, FM waves, TV waves, "shortwav What damage to the body can infrared rays, radar waves, FM waves, TV waves, "shortwave" waves, and AM waves do? I have to do a physics project on causes of cancer, based on a physics standpoint. I have an...

Sounds weird, but it is possible: you can obtain an infrared signal starting from an audio signal, and viceversa: http://jumpjack.wordpress.com/2008/05/20/worlds-cheapest-remote-control-replicator-just-1/ But I miss something: the old Griffin patent states that to produce a 38000 Hz signal...

Are there any specific infrared LED's that have a narrow "beam width" when emitting? If not, does anyone know of a way to constrain it? A lens perhaps? I would like to control the beam width over a distance of about 2 ft. I might need to go with a laser emitter... Any suggestions...

Homework Statement investigate how output from photocell depends on distance from infrared point source am required to design a labratory experiment to investigate how the output from a photocell depends on its distance from a point source of infrared radiation. i am proposing my idea and i...

Hi all, i need some help on this circuit that I am building. i want to get the maximum current for my infrared emitting diode (Kingbright L-53F3C) datasheet->http://www.soselectronic.com/a_info/resource/pdf/king/L-53F3C.pdf" the peak forward current permitted is 1.2A (condition: 1/10...

Hi all, quick question here. As part of a sophomore seminar class, I have this little task to complete. I currently want to send a series of 4 bits through an IR LED that will reach a GaAs photo transistor. What I'm doing is using a shift register to load in the binary value (via a parallel...

I was reading an article about lasers, in specific about CO2 lasers, and it had a sentence like this: "The reason that the CO2 laser is so dangerous is because it emits laser light in the infrared and microwave region of the spectrum. Infrared radiation is heat, and this laser basically melts...

Hi nerdy geeky folks, I have two questions: 1. can a regular cadmium-sulfide detect infrared in a complete absence of light (but a beam of infrared)? if not, what can be used to detect infrared (for a beam break sensor)? 2. I just want to make sure that I am building the circuit right...

I have read some recent preprints in arxiv recently: http://arxiv.org/abs/0709.2042 http://arxiv.org/abs/0704.3260 http://arxiv.org/abs/hep-th/0610148 about the behavior of the gluon propagator in the infrared. Recent lattice computations seem to support them (e.g...

I got a simple question, who actually specializes in infrared technology? (IR LED diods) Is it electrical engineer or someone else? who's domain is it? viktor

Im working on a project and i would like know where i can find an ebook or site that could help me understand this technology. I will use an IR photodiode (Rx) and an IR emitter (Tx). the signal being sent will originate from a RS-232. So basically i have RS-232 <-> IR <-> RS-232, and so i...

does anyone know how what type of circuit i need to transmit a signal over InfraRed. the signal i want to transmit is for example one byte -> 1010 1010 the byte sent will be sent to a RS 232 port i have a shift register with the data ready to be sent i know that i need a IR photodiode...

does anyone know how what type of circuit i need to transmit a signal over InfraRed. the signal i want to transmit is for example one byte -> 1010 1010 the byte sent will be sent to a RS 232 port i have a shift register with the data ready to be sent i know that i need a IR photodiode...