Term
Instrumentation: Probe Assembly
-Includes a miniature ___, microphone, & ___ pump in a small plastic & metal assembly
-Creates ___ signal
-Usually ___ Hz tone (or others)
-Most ___ part of system
-Debris may ___ probes
-May ___ assemblies if dropped |
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Definition
| speaker; air; acoustic; 226; delicate; plug; damage |
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Term
Instrumentation: Air-Pressure System
-Manometer changes ___; can ___ out over time
-Yields specific amt of ___ ___ over time
-Pressure is typically varied from ___ to ___ daPa
-NOTE: if peak occurs around 0 daPa, you may ___ the tympanogram before the pressure reaches -400 daPa |
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Definition
| pressure; wear; air pressure; +200; -400; stop |
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Term
-Probe assembly (A) is connected to an ___ ___ (B)
-___-____ ___-Tube attached to air pressure pump, probe seals canal so pressure can be changed
-___ ___-measures the reflected probe tone in the EAC
-___ ___-attached to a signal generator produces a probe tones |
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Definition
| admittance meter; Air-pressure pump; mini mic; Mini receiver |
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Term
global term, represents acoustic admittance (total energy flow) & acoustic impedance (total opposition to energy flow) of the
middle ear system |
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Definition
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Term
| total acoustic energy flow through a system determined by both in-phase (resistive) & out-of-phase (reactive) components; reciprocal of acoustic impedance; amount of acoustic energy that flow into the ME system |
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Definition
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Term
| unit of measure of conductance of sound wave flow through a medium; reciprocal of acoustic ohm |
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Definition
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Term
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Definition
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Term
| unit of electrical conductance, expressed as the reciprocal of ohm |
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Definition
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Term
unit of resistance of a conductor to electrical or other forms of
energy |
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Definition
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Term
| total opposition to energy flow of sound through the middle ear system; reciprocal of acoustic admittance |
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Definition
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Term
| for every action there is an equal & opposite reaction |
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Definition
| Newton's 3rd Law of Motion |
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Term
| ease of energy flow through the middle ear system that is the main component of reactance at low freqs; reciprocal of stiffness |
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Definition
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Term
| rigidity, expressed as the amount of force required to change the displacement of an elastic medium |
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Definition
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Term
| Admittance in a system due to mass & compliance elements (reciprocal of acoustic reactance) |
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Definition
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Term
| Impedance in a system due to mass & compliance elements (reciprocal of acoustic susceptance) |
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Definition
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Term
Instrumentation Calibration:
-Insert probe assembly to verify that measured volumes are ___
-Use ___-___ calibration cavities. May have __, __, and __ cc cavities
-Volume should be accurate to +/- __%
-Calibrate at least ___ (often daily) |
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Definition
| accurate; hard-walled; 0.5, 1.0 & 5.0; 2; weekly |
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Term
Measurement Steps:
-Probe delivers probe ___ to ear while ___ in canal is varied
-Admittance meter keeps probe tone at a ___ level (in EAC) by using an automatic ___ control circuit
-Meter measures electrical current needed to maintain a constant ear canal ___ ___ ___ |
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Definition
| tone; pressure; constant; gain; SPL |
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Term
-As admittance increases, ear canal SPL ___. So an ___ in the electrical current to the probe receiver occurs
-As admittance decreases, ear canal SPL begins to ___. So a ___ in the current to the probe receiver occurs |
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Definition
| decreases; increase; rise; decrease |
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