Ultrasonic Component Measurement

Ultrasonic Component - Application of Car Radar System

Use an ultrasonic transmitter to emit sound wave in a certain direction.

(Launch and start timing)

Sound signal transmit through air, and when obstacles are encountered on the way, they are reflected and send back to the receiver.

(Stop timing as soon as the response is received)

Ultrasonic Component - Application of Car Radar System

Use an ultrasonic transmitter to emit sound wave in a certain direction.

(Launch and start timing)

Sound signal transmit through air, and when obstacles are encountered on the way, they are reflected and send back to the receiver.

(Stop timing as soon as the response is received)

  • Ultrasonic is a mechanical wave, a special sound wave with a frequency above 20kHz.
  • This sound wave has physical properties, such as refraction, reflection, and interference.
  • Applied to ultrasonic ranging sensors, the transmitter can be used to send out sound wave, and the time difference between sender and receiver can be used to calculate the distance.
  • Divided into destructive and non-destructive.

Most piezoelectric component connect to a circuit.We could use the equivalent circuit model to simulate the vibration characteristic.

The catachrestic of impedance change by the frequency.

  • C0  Static Capacitor
  • R1  dynamic impedance- Resistor
  • L1  dynamic impedance-Inductor
  • C1  dynamic impedance-Capacitor

We can use the complex symbol of AC circuit to evaluate the resonance impedance characteristic of piezoelectric component.

  • Impedance in the circuit:  Z = U / I
  • Admittance in the circuit:  Y = I / U

Measuring admittance of component = Measuring Impedance

  • Evaluate the matching impedance between the component and the circuit.
  • When the piezoelectric component is static.
  • We ignore the loss and consider it as a static capacitor C0.
  • When the component is vibrating and radiating energy.
  • The dynamic impedance and static capacitor will have reflection.

Most piezoelectric component connect to a circuit.We could use the equivalent circuit model to simulate the vibration characteristic.

The catachrestic of impedance change by the frequency.

  • C0  Static Capacitor
  • R1  dynamic impedance- Resistor
  • L1  dynamic impedance-Inductor
  • C1  dynamic impedance-Capacitor

We can use the complex symbol of AC circuit to evaluate the resonance impedance characteristic of piezoelectric component.

  • Impedance in the circuit:  Z = U / I
  • Admittance in the circuit:  Y = I / U

Measuring admittance of component = Measuring Impedance

  • Evaluate the matching impedance between the component and the circuit.
  • When the piezoelectric component is static.
  • We ignore the loss and consider it as a static capacitor C0.
  • When the component is vibrating and radiating energy.
  • The dynamic impedance and static capacitor will have reflection.
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