Encoders and Absolute Encoders in Energy System Engineering

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What is the main difference between digital and analog sensors?

Analog sensors are more reliable than digital sensors.

Digital sensors can only be used for non-contact sensing, while analog sensors require physical contact.

Digital sensors have transistor outputs while analog sensors have a continuous range of voltage or current. (correct)

Analog sensors are faster than digital sensors.

What are the media used for sensing in digital sensors?

Light, sound, electric field (correct)

Temperature, vibration, force

Heat, pressure, humidity

Magnetic field, radio waves, infrared

In optical sensors, what is the most common type of light used for sensing objects?

Infrared light (correct)

Ultraviolet light

X-ray light

Visible light

What is the primary purpose of pulsing the emitter in optical sensors?

To increase the emitter's lifespan Signup and view all the answers

In what context would a dark sensing optical sensor be more suitable compared to a light sensing one?

For detecting transparent objects Signup and view all the answers

How do contact sensors differ from non-contact sensors in terms of operation?

Non-contact sensors detect without touching the component. Signup and view all the answers

'Diffuse reflective' sensors are more useful for what type of surfaces?

Opaque surfaces Signup and view all the answers

'Diffuse reflective' sensors work well with what kind of objects?

Opaque objects Signup and view all the answers

What is the main difference between Absolute and Incremental Encoders?

Absolute Encoders use a unique pattern to represent each position of the disk, while Incremental Encoders are easier to interface because of fewer outputs. Signup and view all the answers

How do Inductive Proximity Sensors work?

They produce a (weak) magnetic field with an oscillator and coil, inducing eddy currents in metallic objects entering the field. Signup and view all the answers

Why are Capacitive Proximity Sensors used?

To produce an electrostatic field and detect objects acting as capacitors. Signup and view all the answers

What is the purpose of Ultrasonic Sensors?

To use a beam of ultrasonic sound as a sonar system for distance measurement. Signup and view all the answers

How do Electric Field Sensors work?

By creating an electrostatic field and detecting changes in voltage. Signup and view all the answers

Which statement about Range of Proximity Sensors is true?

The range is influenced by mass but allows flush mounting, with shielding reducing its effectiveness. Signup and view all the answers

What is a characteristic of Diffuse Reflective Sensors?

They cannot sense black color and are used to sense transparent objects. Signup and view all the answers

What type of disk does an Absolute Encoder typically use for position representation?

Transparent disk with opaque lines. Signup and view all the answers

How many wires are typically used in load powered sensors?

Two wires Signup and view all the answers

Which type of sensor has two power leads and an output lead in line powered sensors?

Optical sensors Signup and view all the answers

In line powered sensors, what does a sourcing type sensor do?

Current flows from sensor to load Signup and view all the answers

Which type of sensor is more suitable for sensing transparent objects?

Light sensing sensors Signup and view all the answers

What completes the circuit in load powered sensors?

Ground connection Signup and view all the answers

Which is a characteristic of three wire line powered sensors?

Two power leads and one output lead Signup and view all the answers

What is the main difference between sourcing and sinking type sensors in line powered systems?

The direction of current flow Signup and view all the answers

Why are light sensing sensors preferred over dark sensing sensors for some applications?

They can sense transparent objects better Signup and view all the answers

What type of optical sensor can differentiate between colors?

Color-differentiating Sensor Signup and view all the answers

Which type of sensor can sense shiny objects using small prisms to polarize light?

Special Reflective Sensor Signup and view all the answers

In which type of optical sensor is the receiver on when it cannot detect the beam from the emitter?

Diffuse Reflective Sensor Signup and view all the answers

What kind of optical sensor emits light across a space and senses the light when not blocked by an object?