Do you want to determine whether your infrared devices are working?
Since infrared light is not visible to our naked eyes, it makes it difficult to determine if your infrared remote control or your computer's IrDA port is transmitting infrared signal. However, if you have a digital camera (a common consumer electronic nowadays), you can use it to detect infrared light. Digital camera sensors (CCD or CMOS) are extremely sensitive to infrared light. Although most consumer digital cameras contain an IR-blocking filter (for color correction), some portion of the infrared spectrum still passes through. If you point the infrared remote control at your digital camera, it is likely that you will see the infrared light on the LCD. Digital cameras without LCD can still capture the infrared light for you to review on your computer. Digital cameras are extremely valuable tools for seeing infrared light.
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