Switches and Displacement Sensors Quiz

A device that measures torque using the principle of capacitance. It consists of a sleeve and a shaft, where the capacitance between them changes with the applied torque.

Sensors that use light to detect the presence or absence of an object. They emit a light beam and analyze the reflected or transmitted light to determine the distance or presence of an object.

A type of optical proximity sensor where the light beam is transmitted from a separate emitter and received by a separate detector.

Optical proximity sensors that utilize changes in light intensity to detect objects. They often suffer from a delay between receiving light and conducting current.

A type of optical proximity sensor that uses triangulation to measure the distance of an object. It emits a light beam and analyzes the position of the reflected light on a sensor to determine the distance.

A sensor that utilizes the Hall effect to detect the presence of a magnetic field. It measures the voltage generated when a current-carrying conductor is placed in a magnetic field.

A sensor that converts mechanical displacement into an electrical signal by measuring variations in the inductance of a set of coils.

A magnetic core within an LVDT that moves axially in response to mechanical displacement. This motion results in variations in inductance within the sensor's coils.

A sensor that detects the presence of an object without physically touching it. It typically uses a transducer to convert a physical property, such as light, magnetism or capacitance, into a measurable signal.

A device that converts one form of energy into another. In sensors, transducers convert physical properties like light, pressure, or magnetism into electrical signals.

A proximity sensor that uses magnetic fields to detect the presence of conductive materials. The sensor generates an electromagnetic field, and changes in this field are measured when a conductive target is introduced.

Circular currents induced in a conductive material when exposed to a changing magnetic field. These currents oppose the change in magnetic field, affecting the sensor's operation.

A proximity sensor that uses electric fields to detect the presence of any object. The sensor creates an electric field, and changes in this field are measured when an object is introduced.

The phenomenon where the value of a sensor's output depends not only on the current input value but also on its past values. This creates a 'lag' in the sensor's response.

The sensor generates an electromagnetic field, and when a conductive material is brought close, eddy currents are generated in the material. These eddy currents oppose the magnetic field, resulting in a change in impedance and a decrease in the sensor's internal AC current. This change is detected by the sensor's internal circuitry, indicating the presence of the conductive material.

A Linear Variable Differential Transformer (LVDT) is a sensor that converts linear displacement into an electrical signal. It works by using a movable core within a set of coils to change the magnetic coupling, which alters the output voltage.

An alternating voltage goes into the center coil of an LVDT. The core's position changes the magnetic coupling with the end coils, resulting in different output voltages on the ends. The core position and output voltage are proportional.

The LVDT's ability to respond to changing position is limited by its inertia. The input voltage frequency should be 10 times the desired response frequency to get a good measurement.

Side loads can damage and reduce the accuracy of an LVDT. They can cause friction between the core and the device, shortening its lifespan and making the readings unreliable.

This device measures the speed of an object. It's made of a stationary coil with a moving permanent magnet core attached to the object. The core's movement creates a changing magnetic field, generating a voltage in the coil proportional to the core's velocity.

This type has a moving coil outside a stationary magnet. Due to inertia, the magnet stays still while the coil moves, allowing for accurate velocity sensing.

Proximity sensors use magnetic fields to detect the presence of nearby objects. They can monitor gear speed by sensing the change in magnetic flux as teeth pass by.

Optical couplers use light to transmit information. In rotor speed sensing, they detect changes in light intensity as the rotor rotates, providing a measurement of speed.