Furnace flame- light intensity

[Nicole04]

Hi Guys,

A basic oxygen furnace is very large 400 ton vessel that steel is refined in. during the refining process oxygen is blown into the steel. during this process there is a flame at the mouth of the furnace, this is what I am interesting in. during the process the flame changes in size and intensity. I want to be measure the intensity of the flame by using a camera to capture an image then use some c#/matlab code to calculate the intensity based on the RGB array of the image. will this work to give an indication of the relative intensity of the flames ? or have a missed the boat? can you clever people please help?

 

[eachus]

You probably want to use a fairly thick filter. CCDs are fairly linear, and in a camera, the lens is usually sized so that other than aiming directly at the sun, the data can be handled. Technically, the light you are trying to measure is not quite as bright as the sun's surface. However the atmosphere knocks the solar intensity down a significant amount.

The best filter for your application is going to reduce the light by several orders of magnitude. You also need to consider the heat absorbed by the filter all up and down the spectrum. This is why I recommend a reflecting filter. The "extra" light from the mirror surface won't contaminate your reading all that much. (And if you care more for cheap than precision you can take almost any pocket mirror and remove the black paint on the back. ;-)

 

[jim hardy]

this is what I am interesting in. during the process the flame changes in size and intensity.

Interesting project.

the flame detectors in our oil/gas fired boilers used a UV sensor and measured the AC component or 'flicker' of the resulting signal.

But that was forty years ago. Surely they've become more sophisticated.

Same outfit is still in business. This instruction manual from them gives an intro to optical flame detection, see around page 14-15. Probably you're aware of them, though...
http://66.18.210.80/manuals/Fireye/SERVICE MANUAL.pdf

 

[Nicole04]

@ eachus - Thank you :) , Thats just the sort of thing I had no knowledge of. I am definitely going to give it a try, will let you know how it goes.

@jim- Thanks Jim, that would work, however cost is a factor, so I'm trying to get a cheap 'home-made' solution ;-)

 

[alphy]

Hello,

Your approach of using a camera and image processing techniques to measure the intensity of the furnace flame sounds like a good idea. However, it is important to note that the intensity of the flame is not solely determined by its size, but also by other factors such as the amount of oxygen being blown in and the type of fuel being used. Therefore, it would be beneficial to also consider these factors when measuring the intensity of the flame.

Additionally, the accuracy of your measurements may also be affected by the distance between the camera and the flame, as well as potential interference from other sources of light in the environment. It would be beneficial to conduct some calibration tests to ensure that your method is able to accurately measure the flame intensity.

Overall, your approach seems like a promising way to measure the relative intensity of the furnace flame. However, it would be important to consider all the relevant factors and conduct some validation tests to ensure the accuracy of your measurements. Good luck with your project!