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Transducer (4 Categories (Resistance-changing (Thermistor (Advantage:…

- - - - Read displacement, force, flow, pressure
      - Frequency of operation is limited to a few hertz
      - Vo = kx, where k =Vdc/L
    - - Mant fine wires of metal or foil in zigzag pattern
      - Measure force, pressure, and stress and strain
      - dR/R = k Dl/l = ke, where k = gauge factor
    - - +ve temperature coefficient
        
        almost linear
      - R = Ro(1+a(T-To))
    - - Like RTD, but more sensitive
      - -ve temperature coefficient
      - Non-linear resistance change
      - Advantage:
        
        Fast
        
        Good accuracy and resolution
    - - Made of CdS
      - Resistance decrease with increased light intensity