Sensoren Aktoren at MCI-Management Center Innsbruck | Flashcards & Summaries

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# Lernmaterialien für Sensoren Aktoren an der MCI-Management Center Innsbruck

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How can the accuracy be improved?

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1. integrationdensity of of sensing elements
2. shape of sensing elements(diamond, ...)
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Explain the term: Nominal Value

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Nominal Values to describe the usability of the system: From... To...

Usually assumed as Full Scale Value

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What are the two most important Capacitive touch sensing methods?

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Projected Capcitance (P-Cap) (Mutual and Self Capactiance); and Analog resistive

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Why do we need a complementary filter?

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For example to measure the roll angle.

• Gyro measures angular velocity and can be integrated but that resuts in massive drift over long time.
• accelerometer knows the down direction over a long period but has a lot off noise in short term
• combinig them with a complementary fiter delivers reliable results
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How does a synchronous machine work?

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• Stator produces rotating magnetic field (RMF)
• Rotor has static magentic field that synchronieses with RMF
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Explain the terms: Reproducability and Repeatability

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Repeatable: A Measurement is repeatable, when you receive the same results under the exact same conditions and procedure.

Reproducable: A Measurement is reproducable if the conditions have changed and you receive the same results (How much does the outcome change, when you change the conditions?)

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TESTE DEIN WISSEN

What are the advantages of a closed loop hall based current sensor?

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better linearity (compenates core non-linearity)

less temperature drift

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Why does the temperature of a resistor change?

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Due to external heat sources ans self heating effects

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List two accuracy error for touch panels

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spacial accurcy of panel itself

induced error by user mistyping

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Explain the left hand rule for Lorentz force

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• Thumb: Electron
• Index finger: B-Field
• Middle finger: Force
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Explain the term: Uncertainty and Error

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Error is the difference between the true value of the measurand and the measured value. Uncertainty characterizes the range of values within which the true value is asserted to lie with some level of confidence (+- 5° etc).

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TESTE DEIN WISSEN

Explain the term: Range

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Its the range (from.. to... nominal values) where the system can be used. Like Nominal Value but can include overload quantities that exceed the nominal value

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Q:

How can the accuracy be improved?

A:
1. integrationdensity of of sensing elements
2. shape of sensing elements(diamond, ...)
Q:

Explain the term: Nominal Value

A:

Nominal Values to describe the usability of the system: From... To...

Usually assumed as Full Scale Value

Q:

What are the two most important Capacitive touch sensing methods?

A:

Projected Capcitance (P-Cap) (Mutual and Self Capactiance); and Analog resistive

Q:

Why do we need a complementary filter?

A:

For example to measure the roll angle.

• Gyro measures angular velocity and can be integrated but that resuts in massive drift over long time.
• accelerometer knows the down direction over a long period but has a lot off noise in short term
• combinig them with a complementary fiter delivers reliable results
Q:

How does a synchronous machine work?

A:
• Stator produces rotating magnetic field (RMF)
• Rotor has static magentic field that synchronieses with RMF
Q:

Explain the terms: Reproducability and Repeatability

A:

Repeatable: A Measurement is repeatable, when you receive the same results under the exact same conditions and procedure.

Reproducable: A Measurement is reproducable if the conditions have changed and you receive the same results (How much does the outcome change, when you change the conditions?)

Q:

What are the advantages of a closed loop hall based current sensor?

A:

better linearity (compenates core non-linearity)

less temperature drift

Q:

Why does the temperature of a resistor change?

A:

Due to external heat sources ans self heating effects

Q:

List two accuracy error for touch panels

A:

spacial accurcy of panel itself

induced error by user mistyping

Q:

Explain the left hand rule for Lorentz force

A:
• Thumb: Electron
• Index finger: B-Field
• Middle finger: Force
Q:

Explain the term: Uncertainty and Error

A:

Error is the difference between the true value of the measurand and the measured value. Uncertainty characterizes the range of values within which the true value is asserted to lie with some level of confidence (+- 5° etc).

Q:

Explain the term: Range

A:

Its the range (from.. to... nominal values) where the system can be used. Like Nominal Value but can include overload quantities that exceed the nominal value

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