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doppler > Transducers part 1 > Flashcards

Transducers part 1 Flashcards

1
Q

Transducer

A

Device that converts one energy into another form of energy

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2
Q

Piezoelectric effect

A

Crystals to emit electric energy when pressure is applied

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3
Q

Reverse piezoelectric effect

A

Crystals to expand or contract when positive or negative electrical current is applied

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4
Q

Curie point

A

Temp of crystals heated while in the presence of a strong electrical field 30-400c

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5
Q

Natural elements

A

Quartz, tourmaline

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6
Q

Man made material

A

Zicronate titanate, barium titanite

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7
Q

Resonant frequency

A

Natural frequency, operating frequency

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8
Q

Bandwidth

A

Range of frequencies emitted

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9
Q

Narrow bandwidth

A

Emits few frequencies

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10
Q

Wide bandwidth

A

Short pulses create many frequencies

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11
Q

Q factor

A

Equal to operating frequency

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12
Q

High Q factor

A

Crystals ring for a long time

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13
Q

Lows factor

A

Rings for short time, pulse

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14
Q

Multi hertz transducer

A

Two more frequency ranges for transmission and reception

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15
Q

Harmonic

A

Frequencies are twice the fundamental frequency

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16
Q

Backing/damping

A

Less ringing

17
Q

By limiting ringing

A

Bandwidth is increased

18
Q

Backing is composed of

A

Epoxy resin impregnated w tungsten

19
Q

Using damping causes

A

Number of cycles to decrease improving axial resolution

20
Q

Axial resolution

A

2 structures on top of each other, parallel to the path of sound travel

21
Q

Axial resolution determined by

A

SPL

22
Q

2 ways to improve axial resolution

A

Use transducer w backing material,

Use high frequency transducer

23
Q

Matching layer

A

Located in front of crystals to decrease the impedence difference between skin and crystals

24
Q

Matching layer made of

A

Aluminum powder I’m epoxy resin

doppler (2 decks)

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