Digital Sensors and Their Principles

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What is the primary purpose of a piezoelectric accelerometer?

To detect changes in magnetic fields

To convert mechanical energy into electrical energy

To quantify acceleration and vibrations (correct)

To measure temperature variations

What is a characteristic of a digital sensor?

It is highly sensitive to temperature changes

It outputs binary coded digital information (correct)

It provides an analog output signal

It can only measure linear displacements

What is the function of metallization in a piezoelectric quartz sensor?

To measure the resonant frequency of the quartz

To filter out noise in the signal

To constitute a capacitor that charges based on applied stress (correct)

To amplify the output signal

What is a key difference between active and passive sensors?

Active sensors require an external power source, while passive sensors do not Signup and view all the answers

What is a common application of a power-meter?

To measure the power consumption of a device Signup and view all the answers

What is a characteristic of a piezoelectric material?

It produces an electric charge in response to applied stress Signup and view all the answers

What type of sensors require an external power source to operate?

Active sensors Signup and view all the answers

What is the principle of operation of LVDTs?

Mutual induction Signup and view all the answers

What type of sensor is an accelerometer?

Capacitive sensor Signup and view all the answers

What is the advantage of LVDTs?

No friction and fully submersible Signup and view all the answers

What is the function of the proof mass and sensing plates in a MEMS accelerometer?

To measure the change in capacitance Signup and view all the answers

What is the name of the type of systems that the MEMS accelerometer is an example of?

Microelectromechanical systems Signup and view all the answers

What is the fundamental principle of active sensors?

They require an excitation that is modified by the sensor to produce the output signal. Signup and view all the answers

What is the output of a passive sensor?

An impedance value Signup and view all the answers

Which of the following is an example of a digital sensor?

IMU (Inertial Measurement Unit) Signup and view all the answers

What is the principle of operation of inductive measurement?

Mobile core inductor Signup and view all the answers

What is the characteristic of a passive sensor's geometry?

It is deformable Signup and view all the answers

What is the principle of operation of a resistive sensor?

Variable resistivity Signup and view all the answers