Question

23. On your new job you have been asked to design a monitoring system for a water treatment process. You have chosen a dissolved-oxygen (DO) detector that operates at a frequency of 30 Hz. You have found that there is a significant source of noise at 5.0 kHz, with roughly the same amplitude as the measurement signal. You decide to minimize (90% reduction) the noise at this wavelength by building an RC filter. Diagram the signals in terms of amplitude vs. frequency, and state what kind of filter you will build and why. Then draw and design an appropriate filter, selecting reasonable values for the capacitor and resistor, and determine the amount of attenuation at the measurement-signal frequency. [15 points]

Answer 1

23) Hoise frequency 5kHz Detector operates at 30H2, which is very low as compare to noise frequency So, we'll build a Re low pass filter with cutoff frequency fe- Nout Vin it w?R? (² How we need 90% Reduction a at to skHz So Hout - 4_10° Vin, 0,1 Vin / um at s-skih let R = rookt Vack the out = 0.1= Vitha) 22 22 Loiol. net 1+(22+51103/100k) c² Itagitxio'?. La s10 Ita9.7x10 2 vol 99 9817 Yol 10-12 c² . CIAF RUPA

voltage - 4-6-3)=15.(5) (400) u25-100 425 uzs Energy a yt53 20 (-1001 11,90 325 for a=3070 45= 20 ( 307-100) 325 Ya 12:76-5 y = 7.734 So, transducer produce 7.73v for a temperature of 307f Resolution of ADC = Dynamic ronge - 15-(-5) - 27 20 1024 - 19.5mv Abe Count = 7.73 -3 396 19.5*1003 396 in binary = 0110001100

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