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Motor controls > phtoto detectors > Flashcards

phtoto detectors Flashcards

1
Q

photodetectros detect

A

light

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2
Q

3 type of photodetectors are

A

photovoltaic
photoemissive
photoconductive

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3
Q

a photoemissive device emits

A

electrons when in the presence of light

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4
Q

3 types of phtoemissive devices are

A

phtototransistor
photodiode
photoSCR

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5
Q

the greatest advantage of a photoemissive device over other photodetectors is its

A

high speeding switch

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6
Q

when light shines on a phototransistor

A

relay coil turns on

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7
Q

a photoconductive device changes

A

its resistance with light

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8
Q

photodetectors that have both the transmitter and the reciever units mounthed in the same housing depend on

A

reflector for operation

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9
Q

photo operated devices fall into one of three categories
photo voltaic, photoemissive

A

photoconductive

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10
Q

the transmitter section of a phto detector is the light scource , which is generally a long life

A

incandesant bulb

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11
Q

photodetectors can be used to sense the presence or

A

absence of almost any object

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Motor controls (8 decks)

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