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Temperature Dependence Of Piezoelectric Constants
The piezoelectric charge constant, d, the piezoelectric voltage constant, g, and the permittivity (dielectric constant),
ε, are temperature dependent, but these relationships can be compensated for in the design of the sensor. Connecting a capacitor in parallel with the sensor eliminates the effects of temperature on output voltage. The increase in the total capacitance of the system will be accompanied by an equivalent reduction in the temperature coefficient for the total capacitance. Because g = d / εT(εT = permittivity at constant stress), the temperature coefficient for g is assumed to be the difference between the temperature coefficients for d and εT, and output voltage will be essentially constant over a wide temperature range.
Design Considerations:
- Operating Temperature Range
- Including Capacitors to Compensate
- PZT Material Choices
- Understanding Key Piezoelectric Constants
Review Air Transducers
Material Characteristics and Options
Get Pricing
Ask Questions
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Pyroelectric Effects
Relatively High Voltages Generated by Temperature Variation
Temperature fluctuations can cause a piezoelectric ceramic element to generate relatively high voltages, capable of disorienting the domains and depolarizing the element. In addition to obstructing measuring accuracy, such changes potentially can damage or destroy input stages of an amplifier. A capacitor incorporated into the circuit, in parallel with the sensor, will suppress the effects of temperature fluctuation by accepting the additional electrical energy. Series bilaminar elements circumvent temperature-related problems because the opposing polarization of the piezoelectric elements compensates for the pyroelectric effect.
Keep in Mind:
- Elements Can Depole
- Potential for Measurement Issues
- Potential for Equipment Damage
- System Design Matters
Soft vs. Hard Ceramics
Discuss Your Design
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UPCOMING EVENTS
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SPIE Smart Structures / NDE Exhibition 2012
When: March 11-15, 2012
Where: Town and Country resort and Convention Center, San Diego, California, USA
Event Info: A multidisciplinary forum that seeks to advance research in adaptive structures and mechanisms, smart sensors, NDE, civil infrastructure, aerospace systems, energy harvesting and more.
Learn more about the event!
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Ultrasonic Industry Association 41st Annual Symposium
When: April 16-18, 2012
Where: Mark Hopkins Hotel, San Francisco, CA, USA
Event Info:
This is a well rounded forum for users, manufacturers and researchers to discuss state-of-the-art materials and devices to generate, detect and suppress sound. Papers will be presented and commercial firms may also display and/or present products.
Additional event information here
Call for Posters - Due March 16, 2012
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3rd International Symposium: MR-guided Focused Ultrasound 2012
When: October 14-17, 2012
Where: Washington, DC Metro Area, USA
Event Info:
Targeted to scientists, clinicians and others interested in current and future applications of MR-guided focused ultrasound, the conference will offer a multifaceted exploration of this emerging field and feature plenary sessions, panel discussions, poster presentations and technical exhibits.
Symposium topics include:
- MR-guided focused ultrasound technology
- Brain, Prostate, Breast and Liver applications
- Back and neck pain, other applications
- Bone tumors & Uterine fibroids
- Focused ultrasound-mediated drug delivery
- Late-breaking Research
- Accelerating Development & Adoption
Additional event information here
Focused Ultrasound Surgery Foundation
Resources from the 2010 Symposium
Other Related Conferences
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