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Sensor Types and Applications

10 carte

Explores various sensor types such as light, temperature, displacement, strain, magnetic field, and current sensors, along with their applications and underlying physics.

10 carte

Ripassa
La ripetizione spaziata ti mostra ogni carta al momento ottimale per memorizzare a lungo termine, con revisioni sempre più distanziate.
Domanda
What is the primary characteristic of an undoped silicon crystal at 0K?
Risposta
At 0K, an undoped silicon crystal behaves as an insulator due to all valence electrons being locked in covalent bonds.
Domanda
How does doping silicon with Arsenic (As) change its conductivity?
Risposta
Doping silicon with Arsenic (valence 5) creates n-type silicon with excess free electrons, increasing its conductivity.
Domanda
What is a 'hole' in p-doped silicon?
Risposta
A 'hole' is the absence of an electron in a covalent bond in p-doped silicon, acting as a positive charge carrier.
Domanda
What happens in a PN junction when it is non-polarized?
Risposta
In a non-polarized PN junction, diffusion creates an internal electric field and a potential barrier (Vi) that stops further charge flow.
Domanda
When is a PN junction diode considered 'blocked'?
Risposta
A PN junction diode is 'blocked' when reverse biased (V0 < 0), meaning no significant current flows as the potential barrier is increased.
Domanda
What is the threshold voltage for a typical 1N4148 diode?
Risposta
The threshold voltage for a typical 1N4148 diode is approximately 0.6V, meaning it conducts when forward biased above this voltage.
Domanda
What is the main function of a half-wave rectifier?
Risposta
A half-wave rectifier selectively allows only one-half of an AC waveform to pass, converting AC to pulsating DC.
Domanda
How does a LED emit light?
Risposta
A LED emits light when an electron recombines with a hole, releasing energy as photons (hν) through its transparent envelope.
Domanda
In a photodiode, what causes the current to flow from P to N when photons arrive?
Risposta
Photons provide energy, moving electrons from the valence to the conduction band, which are then driven by the electric field (Ei) from P to N.
Domanda
What is a primary application of the 4th quadrant operation of a photodiode?
Risposta
The 4th quadrant operation of a photodiode is primarily used in solar panels to generate electrical power from light.

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