I have mounted a piezo-ceramic ultrasonic transducer (MODEL # SMD10T2R111WL, Vendor Website: PIEZO CERAMIC DISC 10X2MM R 215 KHZ WIRE LEADS) under a plastic tank using epoxy. Please see the picture below.
Is there a way to measure the electro-mechanical coupling of the transducer under the tank?
From the specs of the transducer, the electro-mechanical coupling coefficient is >= 60%. What is the meaning of it? Is there a way to measure it?