Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Hi Freebird, thanks for that input. In our case we're calibrating the system to word about 4-7 meters from the stove, and even with the narrowest beam we can get (which we will use) we'll certainly pickup both... Hence the need to detect the spectrum of flame over just heat.
I think thus far...
Excellent FvM, thanks again for your valuable input. Shielding one of two identical UV photocell with glass (amplified with the same curve) is indeed an intersting trick that we'll evaluate... I wonder if some inexpensive part exists with low-cost UV shielding just for this differential...
Hi Keith, thanks for that very important information on constructing a reasonable UV sensor on the cheap by placing a cheap glass filter in front. (I trust that for this method to work that the UV photodiode has to be shielded from all light by the enclosure with just the glass interfacing with...
Hi Keith, thanks very much for that recommnendation on amplifying PIR.
I guess at this point (thanks to the excelllent feedback received in this thread) that PIRs are the way to go for this app.
My thinking at this point is to obtain as many ref designs for motion sensors and try to...
Hi Keith1200rs, many thanks for that very useful post.
As photons get reduced by the square of the distance I felt that a logamp would be the way to go, but I'm no expert in opamp design and I will certainly research "transimpendance amplifiers" with reverse bias of photodiode... do you think...
Thank you very much Sabouras for this recommendation. TI makes good stuff (especially after swallowing National Semi!) and is certainly a key resource to research.
So if I understand correctly, the type of OpAmp we need is a "Low Noise OpAmp"... Do you think these are optimal for the...
Hi Crutschow, thanks for taking the time.
As speed is not an issue (only need to take a reading every 1 to 15 seconds) I hope to obtain low-cost amps that can correctly amplify logarithmically the output of a photodiode so that 1.8V = a hot stove element 1 meter away.
Would you recommend I...
Hello everyone,
We need to construct a very low cost circuit that need to sense a scene about 4-7 meters away the maximum amount of information available through photonic sensors at various bands (visible light, infrared, ultraviolet)
All of these photon sensors are available as photodiodes or...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
