Semicircle piezoelectric ceramic sheet
Dimension: 14×7 3MHz
Thickness: 0.75mm
Frequency: 3 MHz
Type: Electrodes on the same side (type B)
Material PZT5H parameter:
Coupling factor:
Kp=0.68, K31=0.38, K33=0.76, Kt=0.52.
Dielectric Constants: 3200
Dielectric Loss: Tg 2 %
Piezoelectric Constant:
d31=275, d33=620, g31=9.7, g33=22.
Elastic Compliance Constant: 18
Mechanical Quality Factor: Qm=70
Volume density: 7.5 P
Curie point: Tc 230
Young modulus: 56
Poisson ratio: 0.36
Piezoelectric ceramic sheet custom range:
Other frequencies: 200khz to 10MHz.
Piezoelectric Ceramic Sheet Application:
Semicircle piezoelectric ceramic sheet for fetal heart rate sensor
The fetal heart rate probe is realized by the principle of ultrasound.
How does the ultrasound probe function?
Let’s cut open the inside of the probe to see its structure:
Let’s cut open the inside of the probe to see its structureThe Doppler ultrasonic piezoelectric ceramic sheet is composed of two symmetrical piezoelectric ceramic sheets and then connected to the operational amplifier circuit through the power line.
One PZT ceramic sheet is used to transmit signals and the other is used to receive signals.
How ceramic pieces work
Two fetal heart rate detectors：
- In continuous wave working mode, usually, a semi-circular piezoelectric ceramic piece continuously emits ultrasonic waves of a certain frequency, and another semi-circular piezoelectric ceramic piece with the same working frequency is used to continuously receive ultrasonic echo signals.
- In the pulse wave working mode, one circular piezoelectric ceramic plate emits ultrasonic waves for a certain period of time and then stops transmitting while the other half of the ceramic plate receives ultrasonic echo signals.
Whether which methods:
The frequency is generally 1-4khz, the probe only works at one frequency, and the working frequency is generally 0.5mhz-3.5mhz.
The principle of the Doppler fetal heart is to use the piezoelectric ceramic ultrasonic Doppler effect, the ultrasonic transmitter circuit drives the electroacoustic transducer to emit ultrasonic waves, and the ultrasonic probe is placed close to the abdominal wall and faces the fetal heart, and the transducer can receive the reflection back.
The ultrasonic wave converts into an electrical signal, that is an ultrasonic echo signal.
According to the Doppler effect, the echo signal of the ultrasound hitting a moving object will inevitably generate a frequency shift δ. After the echo signal is amplified by high frequency, the input demodulation circuit demodulates the frequency shift δ representing the fetal heart sound. This enables dynamic detection of the fetus.
The use of piezoelectric ultrasound Doppler probes can not only detect a fetal heartbeat, but also detect the movement of the adult heart and valves, diaphragm movement, blood flow, and determine whether blood vessels are blocked.
Common operating frequencies range from 2MHz to 10MHz.
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