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Lecturer(s)
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Mokrý Pavel, prof. Ing. Ph.D.
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Course content
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<u> Lecture topics: </u> Mechatronic system as an intelligent regulated system. Sensors and actuators of the system. Action members of the mechatronic system. Division according to the input quantity, the principle of energy conversion and according to the nature of the output. Intelligent materials and their use for sensory and actuation functions. Piezoelectric materials. Use of direct, indirect or both piezoelectric phenomena. Piezoelectric sensors and their use for measuring selected physical quantities, especially in the mechanics of rigid and flexible bodies (measurement of force, pressure, acceleration, vibration and shock). Construction arrangement. Output signal processing. Piezoelectric resonator as a sensor, chemo- and biosensor. Ultrasonic power transducer for medical imaging devices. Active noise and vibration suppression. Piezoresistive sensors. Piezoresistive phenomenon in crystal (semiconductors). Sensors of selected mechanical quantities (measurement of force, pressure, deformation, torque, acceleration, vibration). Construction arrangement. Output signal processing. Intelligent semiconductor sensors. Main parts, structural arrangement, use. Intelligent sensor in a controlled system. Microelectromechanical systems (MEMS). MEMS as a multifunctional system. Microsystem structure on Si chip. Properties of thin piezoelectric layers. Examples of use. Measurement of small mechanical displacements (LVDT, capacitive sensors, laser interferometry). Transfer of information from moving parts. Selected unconventional methods of scanning and recognition. <u> Laboratory exercise program: </u> Theoretical exercises (examples) Direct piezoelectric effect and its use. Static mechanical stress, equations of state, tensors, output signal amplifiers. Indirect piezoelectric effect and methods of measuring deformation. Capacitive sensor, LVDT probe, interferometry. Measurement of static mechanical stresses, determination of piezoelectric modulus g. Electrical spare circuit of resonator, passive method of measuring resonant frequencies. Ultrasonic transducer. Experimental determination of linear elements of an electric resonator replacement circuit. Resonator as a chemosensor or biosensor. Determination of selected material parameters of piezoelectric ceramics from resonance measurements on a spectrum analyzer. Modal analysis. Magnetic sensors (measurements on Hall probes, integrated contactless sensors, reed relays, inductive sensors). Temperature measurement (measurement on diode, bead, monocrystalline, platinum and thermocouple temperature sensor). Optoelectronic elements (properties of optocouplers, photoresistors, photodiodes and light emitting diodes). Optoelectronic systems (measurements on light barriers, optoelectronic position sensing, information transmission using an infrared transmitter and receiver). Measurement of speed and angle of rotation (incremental sensors, UBM sensors, stroboscopes, potentiometric sensors). Measurement of small mechanical displacements (LVDT probe). Measurement of small mechanical displacements (laser interferometer). Software for collecting and processing measured data on a PC. Simulation of non-electrical systems on a PC (different types of models in computer simulators). Credit (possible verification of knowledge in the form of individual implementation of the connection).
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Learning activities and teaching methods
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Monological explanation (lecture, presentation,briefing), Laboratory work
- Class attendance
- 56 hours per semester
- Preparation for exam
- 44 hours per semester
- Home preparation for classes
- 50 hours per semester
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Learning outcomes
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In this course, students will gain theoretical knowledge and practical skills in the field of electric transducers of physical quantities, actuators and measurement systems. Emphasis is placed on transducers using electromagnetic forces and material properties of the solid phase.
By completing the course the student will gain special knowledge about the electromechanical conversion of electrical energy. He will gain special knowledge in the field of intelligent materials and their applications as sensors or actuators of mechatronic systems.
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Prerequisites
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Condition of registration: Exam from subject Physics 1,2,3
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Assessment methods and criteria
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Combined examination, Oral exam
Prerequisites and co-requisites: Active participation in all laboratory exercises (in case of 1-2 excused absences, completion of the laboratory diary and solution of assigned examples is required), successfully passed tests, credit, written and oral exam.
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Recommended literature
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Ďaďo, S., Kreidl, M. Senzory a měřicí obvody. ČVUT FEL, Praha, 1999.
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ERHART,J.,PŮLPÁN,P., PUSTKA,M. Piezoelectric ceramic resonators. Springer, 2017. ISBN 978-3-319-42480-4.
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Maixner, L. a kol. Mechatronika (Nosek, J., kap.4 - Akční členy mechatronických soustav). Computer Press, Brno, 2006. ISBN 8025112993.
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Setter,N. Piezoelectric Materials in Devices.. Lausanne, 2002. ISBN 2-9700346-0-3.
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