Posted: Sun Oct 08, 2017 10:34 am Post subject: Measurement of Unknown concentraion using IR
Hello friends,
I am working on this project in which i need to measure the unknown (component) concentration of a solution using IR spectrum.
I have used ATMEGA32 with two 12Bit external ADC, connected the sensor output to the ADC, receiving data. First i used known concentration to draw a graph and get a linear equation, loaded that equation in controller and use it to measure value of unknown concentration.
Problem here is that raw known concentration is a mixture of various components whereas i only need to measure a particular component. For which i used specific wavelength of IR, and observing Transmittance and Scattering using two sensors, feeding to two ADC's and calculating the values.
Results are on display but with few errors, one is due to the noise, which can be rectified, but one error is of getting false measurement (2 out of 10 samples), how i can overcome this error? Is there any way to sort it out using code or i need to be more specific with wavelength selection and hardware??
Kindly guide.
Thank you
Regards
Aniruddha
(BASCOM-AVR version : 2.0.8.0 , Latest : 2.0.7.8 ) _________________ We are not innovating, we are just manipulating innovations done by Mother Nature.......
Sounds like the question: 'my car's engine doesn't work, what's the reason?'
The details are missing.
Anyway it needs to be differentiated whether the hardware out of sensors/adcs reliably returns the same result under given conditions.
Maybe test the setup without solution or a dummy which simulates the solution.
In case hardware works hundred percent, then the setup may be too simple, for example the bandwidth of the light source is too high or the light source is shifting its center wavelength while it heats up. Also more simple issues come into mind, for example a mechanical issue of the setup directly influencing reflected and transmitted light.
Sorting it out with code would be much cheaper, I would try to add the values of reflectance and transmittance and compare the results of good measurements with bad ones.
If there's a logic behind, it can be sufficient to simply reject bad measurements.
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