Encoders and Absolute Encoders in Energy System Engineering
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Questions and Answers

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?

    <p>To increase the emitter's lifespan</p> Signup and view all the answers

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

    <p>For detecting transparent objects</p> Signup and view all the answers

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

    <p>Non-contact sensors detect without touching the component.</p> Signup and view all the answers

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

    <p><strong>Opaque</strong> surfaces</p> Signup and view all the answers

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

    <p><strong>Opaque</strong> objects</p> Signup and view all the answers

    What is the main difference between Absolute and Incremental Encoders?

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

    How do Inductive Proximity Sensors work?

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

    Why are Capacitive Proximity Sensors used?

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

    What is the purpose of Ultrasonic Sensors?

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

    How do Electric Field Sensors work?

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

    Which statement about Range of Proximity Sensors is true?

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

    What is a characteristic of Diffuse Reflective Sensors?

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

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

    <p>Transparent disk with opaque lines.</p> Signup and view all the answers

    How many wires are typically used in load powered sensors?

    <p>Two wires</p> Signup and view all the answers

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

    <p>Optical sensors</p> Signup and view all the answers

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

    <p>Current flows from sensor to load</p> Signup and view all the answers

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

    <p>Light sensing sensors</p> Signup and view all the answers

    What completes the circuit in load powered sensors?

    <p>Ground connection</p> Signup and view all the answers

    Which is a characteristic of three wire line powered sensors?

    <p>Two power leads and one output lead</p> Signup and view all the answers

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

    <p>The direction of current flow</p> Signup and view all the answers

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

    <p>They can sense transparent objects better</p> Signup and view all the answers

    What type of optical sensor can differentiate between colors?

    <p>Color-differentiating Sensor</p> Signup and view all the answers

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

    <p>Special Reflective Sensor</p> 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?

    <p>Diffuse Reflective Sensor</p> 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?

    <p>Diffuse Reflective Sensor</p> Signup and view all the answers

    Which optical sensor emits light to a specific focal point and senses the reflected light from that point?

    <p>Focal Length Sensor</p> Signup and view all the answers

    What is a characteristic of optical sensors that use fiber-optic cables?

    <p>Small size and flexible</p> Signup and view all the answers

    Which optical sensor type cannot sense transparent objects?

    <p>Diffuse Reflective Sensor</p> Signup and view all the answers

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