Flashcards
Physics Formulas
Flashcards do conjunto (23)
- 1PERIODthe time it takes a wave to vibrate a single cycle, or the start of one cycle to the start of the next cycle
P= 1 / F - 2FREQUENCYthe number of cycles that occur in one second
F = 1 / P - 3INTENSITYthe concentration of energy in a sound beam
I = power / area
intensity is proportional to power which is proportional to amplitude^2 - 4WAVELENGTHthe distance or length of one complete cycle
wavelength = c / f - 5PROPOGATION SPEEDthe rate at which a sound wave travels through a medium
c = f x wavelength - 6PULSE DURATIONthe actual time from the start of a pulse to the end of a pulse
PD = # of cycles / f - 7SPATIAL PULSE LENGTHthe distance a pulse occupies in space from the start to the end of a pulse
SPL = # of cycles x wavelength - 8PULSE REPETITION PERIODthe time from the start of one pulse to the start of the next pulse
PRP = 1 / PRF - 9PULSE REPETITION FREQUENCYthe number of pulses that an ultrasound system transmits into the body each second
PRF = 1 / PRP - 10DUTY FACTORthe percentage or fraction of time that the system transmits
DF% = (PD / PRP) x 100 - 11RAYLEIGH SCATTERscattering that occurs when a structures dimensions are smaller than the beam force, redirects the sound wave in equal directions
Rayleigh Scattering is proportional to frequency^4 - 12ATTENUTATION COEFFICIENTnumber of decibels of attenuation that occurs when sound travels one centimeter
AC(dB/cm) = f / 2 - 13ATTENUATIONdecrease of intensity, power and amplitude as it travels through a medium, determined by path length and frequency
TA(dB) = AC x distance - 14IMPEDANCEacoustic resistance to sound traveling in a medium
Z(rayls) = density x c - 15INCIDENT INTENSITYthe sound waves intensity immediately before it strikes a boundary
incident intensity = reflected intensity + transmitted intensity - 16INTENSITY TRANSMISSION COEFFICIENTthe percentage of intensity that passes in the forward direction when the beam strikes and interface between two media
ITC% = (transmitted/incident) x 100 - 17INTENSITY REFLECTION COEFFICIENTthe percentage of the intensity that bounces back when a sound beam strikes the boundary between two media
IRC% = (z2-z1/z2+z1)^2 x 100 - 18NEAR ZONE LENGTHNZL = dia^2 x freq / 61.6
- 19BEAM DIAMETERBD = 1.85 / dia x freq
- 20OPERATION FREQUENCYf = c (PZT) / 2 x thickness (PZT)
- 21FRAME RATEFR = 1 / Tframe
- 22SNELLS LAWthe direction and amount of refraction of a sound wave through a medium
c2 > c1 = angles away from normal
c1 > c2 = angles towards normal - 23DEPTHDepth is directly related to PRP
Depth is inversely related to PRF
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- FlashCards sobre Physics Formulas, criado por Amanda Fisher em 06-09-2020.
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- Amanda Fisher
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