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Questions and Answers
A sensing unit can consist of additional components such as filters, amplifiers, modulators, and other signal conditioners. True or False?
True
The actuating unit consists of an actuator and optionally a power supply and a coupling mechanism. True or False?
True
Transducers are devices used to transform one kind of energy to another. True or False?
True
An actuator is a transducer that converts a measurable quantity to an electrical voltage or an electrical current. True or False?
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An instrument refers to an actuator together with some of its associated electronics. True or False?
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A sensor is a converter of generally electrical effects into electrical signals. True or False?
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Passive sensors require external power for their operation.
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Analog sensors produce binary output signals.
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Digital sensors incorporate active electronic components such as amplifiers and ICs.
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Eyes detect heat energy as a form of input.
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Active sensors directly generate an electric signal in response to an external stimulus.
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A thermistor changes its resistance when cooled.
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Passive sensors incorporate active electronic components like amplifiers and ICs.
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Human skin detects sound energy as a form of input.
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Infrared sensors are examples of mechanical quantity sensors.
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Sensors that detect physical quantities are classified as digital sensors.
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Study Notes
Sensing and Actuating Units
- Sensing units may include various components such as filters, amplifiers, modulators, and other signal conditioners to enhance signal processing.
- Actuating units typically consist of an actuator, which may require an auxiliary power supply and a coupling mechanism for operation.
Transducers and Actuators
- Transducers are devices that convert one form of energy into another, facilitating the measurement and control processes.
- An actuator is a specific type of transducer that transforms a measurable quantity into an electrical voltage or current, thus enabling control systems.
Instruments and Sensors
- An instrument comprises an actuator along with its associated electronics, integrating sensing and control capabilities.
- Sensors function as converters that turn various physical effects into electrical signals, serving as the initial point of data capture in a system.
Sensor Types and Characteristics
- Passive sensors do not require external power; they rely on the measured signal for operation.
- Analog sensors provide continuous output signals, not binary, which means they can represent a range of values.
- Digital sensors utilize active electronic components, such as amplifiers and integrated circuits (ICs), allowing for digital output signals.
Energy Detection
- Active sensors generate an electrical signal directly in response to an external stimulus, enabling real-time measurement.
- Infrared sensors serve as examples of sensors that can detect thermal energy, while thermistors alter their resistance with temperature changes.
- Human skin perceives sound energy as an input type, showcasing the variety of sensing mechanisms in biological systems.
Misconceptions in Sensor Classification
- Passive sensors do not incorporate active components like amplifiers and ICs; this is a characteristic of digital sensors.
- It is incorrect to classify all sensors detecting physical quantities solely as digital sensors, as sensors can also be analog or other types.
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Description
Test your understanding of the components of closed loop control systems, sensors, actuators, and mechatronics systems as well as the functions of sensing units and controllers in this quiz.
