Noise caused by fluorescent light in infrared transceiver

[louislu]

infrared transceiver

hi...currently doin a proj regading infrared transmission.here a prob would like to ask for help...i m using HSDL-1100 infrared transceiver to establish a infrared transmission.it seems no pron in transmitter end but the receiver end is easily susceptible to noise.i m quite sure these noise come from flourescent light.because when i switch off the light then everything all right.however this infrared transceiver is designed to has immunity of sunlight or flouresescent light.anyone can tell me y?thanks in advance....

 

[flatulent]

Re: infrared transceiver

There are two classical methods to reduce this problem. The first is to put a baffle around the receiver so only light from the direction of the transmitter shines on it. The other is more complex. Use a modulated carrier method so there are no spectral components at the lower frequencies. Then use high pass amplifiers so that signals at the power line frequencies are not amplified.

 

[usernam]

Re: infrared transceiver

The light from them is actually rapidly pulsed usually at around 50KHz and at such high brightness this can still produce signals than can squeeze through a filter.

 

[Analyzer]

infrared transceiver

Hai,

Try to put module into a violet windowed black box.Then you'll get lower noise.The second choice is to change modul with a good-filtered one, like Vishay's or MiniSIR.

Analyzer