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IR range

  1. Oct 11, 2011 #1
    i want to know about wave length of infarade wave and working range
  2. jcsd
  3. Oct 11, 2011 #2
    Re: wavelength of light

    What do you want to know about it (them)?
  4. Oct 11, 2011 #3
    Re: wavelength of light

    Infrared(I think that's what you mean by infarade) waves encompass the region of the electromagnetic spectrum right before light, commonly considered as heat radiation. As it is present right before light, it has a frequency that is a bit lower, and a wavelength that is higher as a result of the equation given in a post above. Due to the lower frequency, it also has less energy, also given in an equation in a post above.

    Or, in less nerdy terms, infrared is the segment before light, with lower energy/frequency.
  5. Oct 11, 2011 #4


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    Re: wavelength of light

    What do you mean by "working range"?
  6. Oct 27, 2011 #5
    Re: wavelength of light

    I want to know about the working range of Infrared receiver and transmitter and also if there is any type of IR transmitter just like as RFID Passive tag
  7. Oct 27, 2011 #6
    Re: wavelength of light

    what??? makes no sense.
  8. Oct 28, 2011 #7
    Re: wavelength of light

    Infrared is the part of the EM spectrum between the upper end of visible and microwaves.
    Roughly 750 nm to about 1 mm. I am sure there is some disagreement on the upper boundary, but long wavelength IR and microwaves have a lot in common.
  9. Oct 28, 2011 #8

    Andy Resnick

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    Typically, short-wave infrared (SWIR) is from 0.7 um to 1.1 um, the part of the spectrum we can't see but that Si detectors can still respond to. Mid-wave (MWIR) is about 3-5 um and long-wave (LWIR) is 8-12 um: both bands are set by absorbance bands of water, and the MWIR and LWIR bands are within 'transmission windows'. Going out further, for example in FTIR measurements, the far infrared can go out to about 20um or more.
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