Fundamentals of Measurement Technology (8) Prof Wang Boxiong
Fundamentals of Measurement Technology (8) Prof. Wang Boxiong
Chapter 4 Acquisition of measurands
Chapter 4 Acquisition of measurands
4.1 Introduction Transduction implies the conversion of a measured or observed quantity, the measurand, into an electrical, hydraulic pneumatic, or any other output by means of a transducer or sensing element The device employed to accomplish this conversion is known as a transducer or a sensing element(sensor)
4.1 Introduction • Transduction implies the conversion of a measured or observed quantity, the measurand, into an electrical, hydraulic, pneumatic, or any other output by means of a transducer or sensing element. • The device employed to accomplish this conversion is known as a transducer or a sensing element (sensor)
4. Introduction Transducer and sensing element are two different concepts >Sensing element: the element or unit which directly senses and converts the measured quantities > Transducer: the whole device consisting of a sensing element with its associated auxiliary components and circuits, the sensor or sensing element being the kernel component
• Transducer and sensing element are two different concepts. ➢Sensing element : the element or unit which directly senses and converts the measured quantities ➢Transducer : the whole device consisting of a sensing element with its associated auxiliary components and circuits, the sensor or sensing element being the kernel component 4.1 Introduction
4. Introduction Since we are mainly interested in signal conversion laws of different devices and do not care for whether it is a sensing element or a transducer, so we do not distinguish between a transducer and a sensing element and generally refer to such a device as a transducer if no additional explanation is given Since a transducer is located at the input of measuring instrument, its quality will influence directly the performance characteristic of the whole instrument
• Since we are mainly interested in signal conversion laws of different devices and do not care for whether it is a sensing element or a transducer, so we do not distinguish between a transducer and a sensing element and generally refer to such a device as a transducer if no additional explanation is given. Since a transducer is located at the input of measuring instrument, its quality will influence directly the performance characteristic of the whole instrument. 4.1 Introduction