To magnify the infrared signal for higher resolution.

To direct and segment incoming infrared radiation on the pyroelectric elements.

To focus visible light onto the pyroelectric elements for better detection accuracy.

To collect and concentrate infrared radiation onto the pyroelectric sensor for increased sensitivity.

It produces a constant electrical output regardless of further temperature changes.

It ceases to exhibit the pyroelectric effect.

It permanently increases its piezoelectric sensitivity.

Because it generates a constant voltage regardless of the applied force

Because it primarily responds to changes in mechanical stress, not to constant forces

Because it requires an alternating current power supply to operate

Because it measures the absolute magnitude of static pressure over time

To control the phase of the generated signal through capacitive coupling

To stabilise the mechanical deformation of the sensor during operation.

To collect the electrical charge generated on the surfaces of the piezoelectric material under stress

To measure the internal resistance of the piezoelectric material.

Determining the threshold indoors and the sensor heating in the afternoon sun mean that the sensor isn't responding the same in the afternoon, so the threshold may no longer be appropriate

Additional environmental stress (breeze, vibrations from traffic) has affected the sensor's shielding and the signal from the sensor is now too noisy for the threshold.

In the afternoon, the sun shines into the model, and the light affects the response of the sensor to the magnet.

The metal parts of the brush are heating up in the sun, which alters its magnetic properties and affects the sensor's measurements

No, it is completely insensitive to the direction of the magnetic field

Limited, it can detect whether a perpendicular field is positive or negative, but no off-axis fields

No, it only detects one direction of magnetic field

Yes, it can detect a range of directions if the magnetic field has the correct polarity

Sampling - more samples random variation has a lower impact

Electromagnetic interference - higher current is more resilient to inductive noise sources

Ohm's Law - higher current means lower resistance, which reduces noise

Thermodynamics - noisy physical processes like heat dissipation are less relevant at high currents