I hosted a webinar on October 27, 2023 on

"Preload measurement circuit for bolt-clamped ultrasonic Langevin transducers"

You can watch the recording on my YouTube Channel here: 

https://youtu.be/3DMhhIglg0o

Here is a link to the presentation notes.

Here is a link to the preload calculator that I use during the webinar: Preload Calculator

Topics

In this webinar recording, I show how to measure the preload of an ultrasonic transducer stack transducer using a simple circuit and a multimeter. I provide calculations and a real demonstration.

Video outline

• 0:29 - Outline of webinar
• 1:50 - Bolt-clamped transducer components
• 3:00 - Introduction to my consulting work
• 9:32- Why do we preload?
• 12:52 - Preloading measurement method comparison
• 17:30 - How to determine the required preload
• 25:00 - Theory of voltage to preload using a film capacitor circuit
• 30:00 - 5 benefits of using a film capacitor circuit for charge measurement
• 35:00 - Introduction to my prestress calculator
• 37:30 - Choosing a capacitor and time constant
• 41:30 - Options to measure preload voltage
• 42:56 - The exact capacitor I recommend
• 44:00 - Walkthrough of loosening and fastening a transducer and measuring preload voltage and torque
• 46:22 - Calculation of stress from transducer used in demonstration
• 47:25 - Weekly webinars on preloading

48:00 - Questions

***Announcement***

My next webinar will be on Friday, November 3, 2023 at 11AM EST. I will cover

"High Impedance Multimeter Modification for Ultrasonic Transducer Preload Measurement”

Here is the link to sign up for the upcoming webinar: https://www.ultrasonicadvisors.com/monthly-ultrasonic-webinar