Question

Question 2: An absolute angular encoder comprises of the same number of LED and photo-transistor combination as the number of tracks. Consider the absolute angular encoder in Figure 3 where the white slits allow the light from the LED to travel to the photo-transistor when turns on (logic 1) When the light does not reach the photo-transistor, it is in off state (logic 0). In the configuration shown in Figure 3a, the LED and photo-resistor combinations are denoted by black dots and the binary output of 00000 corresponds to 0 deg (a) The encoder reading 0 deg (b) The encoder at some angular position Figure 3: An absolute angular encoder. (a) What is the resolution and uncertainty of this absolute optical encoder? (b) What is the binary logic output and angular value with uncertainty for the encoder position in Figure 3b?

Answer 1

Solution Constdex -the ahsolute. whese the uwhtte stts allow he ight from ul0γ encoders, fiame. tobrael to the poto 、transitor when the Vight dees notAah the photo Gven an encode wohcel tth → clearly rt rs a 5-brt System resolution 2- binay logte or ouk put. and ang ular valte ustih

tcoic would be C L0O uwhich Conespumds ko the valve. 4 = 16 +0x8+0x4 + 2 + 19 cơmeSondina are)ular valve would be : 32. x x 360 32 zlai 3.45 degrees