It depends on what you mean by frequency...
Infrared radiation is in the range of about 1 to 300 micrometers, with an equivalent frequency of about 1 to 400 terahertz.
The encoding frequency, on the other hand, depends on the particular IR device. Some operate at about 40 kilohertz.
If a circuit requires an IR LED, it requires an IR LED, there is no replacement. If a circuit does not require an IR LED, there is no need to look for a replacement.
IR rays are generated from sun. They are the ones that generate heat out of the rays.
IR LED will be having connecting leads same as ordinary LED. When ever we use IR LED, which works like a transmitter we have to connect a photo diode as a receiver (very near to IR LED). So as we know IR LED keeps on emitting IR radiations photo diode will keeps on receiving, it in a reflecting surface. In case if the surface not reflect IR radiation(Black surface obsorbs IR). the input to the photo diode becomes nil, and photo diode wont work and hence the circuit. inform.mayaprasad@gmail.com
Most infra-red remote controls operate in the region of 36KHz - 40KHz although some are in the 50Hz region or higher.
40 kHz
The 555 is a timer and oscillator chip capable of sourcing and sinking 200 milliamperes, and is useful for pulsing an infrared LED to power an infrared transmitter. It can be pulse width modulated or otherwise controlled via the various control pins. See: http://talkingelectronics.com/FreeProjects/555/555-P3.html in most cases the IR detector used is TSOP sensors which works only on a specified frequency of 38KHz. So by using 555 timer, we can design the circuit very easly to work @ 38KHz. dats why in 555 is used in many IR txns.
Ultraviolet waves have shorter wavelengths than Infrared waves. Since the relationship between wavelength and frequency is inversely proportional, UV waves have a much higher frequency than IR waves. IR waves have a frequency around 1012 Hertz, while UV waves' frequencies are around 1018 Hz. Thus, UV waves are more powerful than IR waves and can cause binds between molecules to break much more easily than IR waves.
Between O.7 and 300 micrometres
since infrared (IR) is just below the visible spectrum of light in frequency and is radiated strongly by hot bodies......i think so
A IR thermometer or Pyrometer is used where it is not possible to measure temperature with contact, IE very hot or very cold temperatures or where the object is a distance away. Infrared is in the 10-6 to 10-4 Meter band, this is called the thermal radiation band. It is between the microwave band and the visible light band. An IR thermometer, transmit a predefined IR frequency signal to the object under measurement, if the IR generated by that object itself is of a lower frequency than the received IR, that frequency is subtracted from the received frequency and that IR signal is then reflected back to the IR thermometer, this received signal is then used by the build in electronics of the thermometer to calculate the temperature of the object under measurement. Some uses: * Detecting clouds for remote telescope operation * Checking mechanical equipment or electrical circuit breaker boxes or outlets for hot spots * Checking heater or oven temperature, for calibration and control purposes * Detecting hot spots / performing diagnostics in electrical circuit board manufacturing * Checking for hot spots in fire fighting situations * Monitoring materials in process of heating and cooling, for research and development or manufacturing quality control situations
why we use LED in a hidden CCD camera?
In IR spectroscopy, the frequency of a vibration is related to the wavenumber, which is measured in reciprocal centimeters (cm^-1). The frequency can be calculated using the equation: frequency (Hz) = wavenumber (cm^-1) x speed of light (cm/s).