上海充通大学 2.2 Active &Passive Transducers SHANGHAI JIAO TONG UNIVERSITY Transducer definition in technical paper:a device that converts one type of energy to another. In this book,transducer does not necessarily means energy conversion. Passive Transducer:A component whose output energy is supplied entirely or almost entirely by its input signal. e.g.Pressure Thermometer shown in Figure 2.3 Active Transducer:It has an auxiliary source of power which supplies a major part of the output power while the input signal supplies only an insignificant portion. e.g.Digital Revolution Counter shown in Figure 2.4,2.6,2.7 n practical,an instrument may have passive active transducers,it is considered as an active transducer as an entire. 上泽充冠大学 SHANGHAI JIAO TONG UNIVERSITY 2.2 Active &Passive Transducers Auxiliory Auxiliary power power Motor +。 0 0 e Amplifier esl Torque direction for ee positive -Slide wire Auxiliary Fig 2.7 powe Instrument Servomechanism "Black box" Mix of passive active transducers2.2 Active ＆Passive Transducers Transducer definition in technical paper: a device that converts one type of energy to another. In this book, transducer does not necessarily means energy conversion. Passive Transducer: A component whose output energy is supplied entirely or almost entirely by its input signal. e.g. Pressure Thermometer shown in Figure 2.3 Active Transducer: It has an auxiliary source of power which supplies a major part of the output power while the input signal supplies only an insignificant portion. e.g. Digital Revolution Counter shown in Figure 2.4，2.6， 2.7 In practical, an instrument may have passive & active transducers, it is considered as an active transducer as an entire. 2.2 Active ＆Passive Transducers Fig 2.7 Instrument Servomechanism Mix of passive & active transducers