How can I see the infrared rays emitted by the TV remote control?

You can turn on the camera of your mobile phone, light up the transmitter of the infrared remote control, and then press the remote control to see it. Because the photosensitive element in the camera is sensitive to infrared rays, it can generate images. On the display screen of the mobile phone, you should be able to see the white light from the remote control. If not, it means that there is something wrong with the remote controller and it should be repaired or replaced, so that it can be judged whether the fault is the remote controller or the receiving equipment.

Infrared is an electromagnetic wave with a wavelength between microwave and visible light, and an invisible light with a wavelength between 760 nm and 1 mm, which is longer than red light. Anything above absolute zero (-273. 15℃) can produce infrared rays. We call radiation other than red light infrared (ultraviolet other than violet light), which is invisible to the naked eye.

So usually, when we press it with the TV infrared remote control, we can only see a red dot flashing on the transmitter, but we can't see the whole beam.