sensor for Firefighting robot

[toomosta]

hi,,
I need to use sensor which can detect candle's light in average lighted room (it's not allowed to use micro-controllers)

 

[D.A.(Tony)Stewart]

Not possible or trivial if average light includes tungsten lamps.

One would need an Infrared scanner with a roatating mirror using a linear array og high gain narrow angle detectors or a camera CCD array. Dyalight blocking filters are essential.

In any case some vision system is needed,

 

[chuckey]

I would have though that a flickering flame would produce an LF audio component on the output of a photodiode.
Frank

 

[D.A.(Tony)Stewart]

Yes Frank, perhaps after 80dB notch filters at 120,60 Hz or 100,50Hz from fluorescent, and tungsten light and very high gain, while motionless.

 

[deepeshmishra]

LDR will also be a good choice and can be used with opamp for light sensitivity.

 

[jiripolivka]

Flame detectors utilize UV sensors which are independent on ambient light. Some scanner will be needed for your application

 

[chuckey]

Instead of using notch filters to get rid of 50 HZ pick up, why not use a 50 HZ synchronous detector. The 50 HZ would be a steady DC component, while the flickering would not be.
Frank