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How is the modulation technique used?

Whether AM or FM modulation is used in IR sensors?

  • in the VEHICLE SPEED CONTROLLING the IR sensors are used .i don't know which modulation is used in IR sensor?

  • Answer:

    the most common IR source and detector is LEDs. The laser action of an LED is not easily modulated, IR devices, like remote controls, work by pulsing, on or off digital like communication.

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The IR LED is usually on, and the sensor reads pulses as the light is interrupted by the interruptor. The length of the pulses indicates speed, shorter pulses the faster the speed, longer pulses are a lower speed.

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