LECTURES

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LearnPiezo.org Lectures
The goal of this website is to provide a means for learning the fundamentals of piezoelectric materials by providing a free online class on the subject.
Lecture 2: Mechanical and electrical properties of materials


Lesson Length (1 hour and 4 min)

In this lecture we introduce several concepts regarding mechanical and electrical materials properties and quantities. You may already be familiar with these topics. That being said, I feel a review of this material is necessary to form a solid foundation before discussing the electromechancial properties of piezoelectric materials


Lecture 3: Macroscopic Piezoelectric Properties


In this lecture we are introduced to the different parameters and properties that describe the electromechanical behavior of piezoelectric materials.


Lecture 9: Thermodynamic Explanation of Properties

In this lecture, we will discuss how energy (thermodynamics) can be used to understand piezoelectric material properties. 


Lecture 10: Impedance Analyzer Characterization


In this lecture, we learn how to characterize a piezoelectric material or transducer using an impedance analyzer, one of the most common instruments used to measure piezoelectric material properties.


Lecture 11: Piezoelectric Heat Transfer


In this lecture, we learn about fundamental concepts of heat transfer, we apply them to heat generation in piezoelectric materials, and finally experimental demonstrations using a thermal camera are shown to solidify concepts.


Question and Answer


Some questions submitted through email and teleconference have made their way here. Ask away! 

  Q1: What is the behavior of a piezoelectric component if I apply a voltage with a frequency that it is not its resonance and antiresonance frequency?  
Q2: How can we estimate piezoelectric properties from the capacitance?

Often times we do not have access to equipment which makes resonance characterization easy. Therefore, for this or other reasons we would like another way to easily understand a property using off-resonance measurements. In this lecture, I explain how to estimate material properties from the capacitance and dielectric loss.
 
Q3: Problems with a transient ultrasonic transducer  

Designing an ultrasonic transducer can go horribly wrong. In this lecture we discuss different problems with a transient ultrasonic transducer. In this applications a piezoelectric disk is used to propagate a wave through liquid, with the goal of determining the density of the liquid from the time of flight. Many problems that a real engineer had in this application are presented and their practical solutions.
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  Q4: Part 1- Regarding a Piezo Unimorph Sensor 

In this lecture, we describe and derive how to calculate voltage generated from a unimorph piezoelectric sensor. Relationships between tip displacement, strain, and generated voltage are discussed.

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  Q4: Part 2- Regarding a Piezo Unimorph Sensor
In this lecture, we go over FEA verification of displacement, stress, and strain formulations derived in Part 1 using the FEA program Mecway
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