mechanical systems laboratory me 4053 acoustics lecture 1 fall 2010 ©2010 peter rogers georgia tech
TRANSCRIPT
![Page 1: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/1.jpg)
Mechanical Systems Laboratory ME 4053
Acoustics Lecture 1
Fall 2010
©2010 Peter Rogers
Georgia Tech
![Page 2: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/2.jpg)
ACOUSTICS
• Generation
• Propagation
• Detection
• Effects
of compressional waves
in gases, liquids and solids
![Page 3: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/3.jpg)
SOUND is a WAVE
A disturbance which propagates
![Page 4: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/4.jpg)
SOUND is a WAVE
A disturbance which propagates
![Page 5: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/5.jpg)
SOUND is a WAVE
A disturbance which propagates
![Page 6: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/6.jpg)
SOUND is a WAVE
A disturbance which propagates
![Page 7: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/7.jpg)
SOUND is a WAVE
A disturbance which propagates
![Page 8: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/8.jpg)
SOUND is a WAVE
A disturbance which propagates
![Page 9: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/9.jpg)
SOUND is a WAVE
A disturbance which propagates
![Page 10: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/10.jpg)
SOUND is a WAVE
A disturbance which propagates
![Page 11: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/11.jpg)
SOUND is a WAVE
A disturbance which propagates
![Page 12: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/12.jpg)
Sound is a Disturbance in:
• Presure
• Density
• Velocity (longitudinal)
• Temperature
![Page 13: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/13.jpg)
Pressure Range
10-5 Pa 108 Pa threshhold explosion of hearing
[105 Pa = 1 Atm]
![Page 14: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/14.jpg)
Frequency Range
10-2 Hz 109 Hz gravity wavelength waves comparable
to light
Hearing range ~ 20 Hz 20,000Hz
infrasonic < audible < ultrasonic
![Page 15: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/15.jpg)
1-D Wave Equation DerivationFluid in a Pipe
x x + dx
0
t
ux x
x
puu
xu
t xxx
Conservation of mass
Conservation of momentum
![Page 16: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/16.jpg)
Sound is a disturbance from ambient state
1-D Wave Equation DerivationLinearization
),(),(
),(),(
),(),(
0
0
0
txuutxu
txpptxp
txtx
Axx
A
A
Keep only terms linear in acousticquantities
t
ux x
x
puu
xu
t xxx
x
p
t
u AAx
0
tx
u AAx
0
![Page 17: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/17.jpg)
x
p
t
u AAx
0
tx
u AAx
0
AcousticContinuity Equation
Acoustic Euler Equation
2
22
0 txt
u AAx
2
22
0 x
p
tx
u AAx
t
Subtract 2
2
2
2
x
p
tAA
x
![Page 18: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/18.jpg)
2
2
2
2
x
p
tAA
Need a relationship between pA and ρA
c is the speed of sound
€
pA = c 2ρA
€
1
c 2
∂ 2 pA
∂t 2 =∂ 2 pA
∂x 2
Wave Equation
![Page 19: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/19.jpg)
€
c =p0
ρ0
€
p
p0
=ρ
ρ0
⎛
⎝ ⎜ ⎞
⎠ ⎟
γ
€
p0 + pA
p0
=ρ0 + ρA
ρ0
⎛
⎝ ⎜ ⎞
⎠ ⎟
γ
€
1 +pA
p0
= 1 + γρA
ρ0
+K
Sound propagation is adiabatic
Air is an ideal gas
€
p = ρRT
linearize
€
pA =γ p0
ρ0
ρA
Acoustic equation of state
xLaplace 1816
William Derham (1709)
c= 345.6 m/s
c= 289 m/s
€
1
c 2
∂ 2 pA
∂t 2 =∂ 2 pA
∂x 2
€
pA = c 2ρA
Boyles Law1662
€
p
ρ=
p0
ρ0
€
pA =p0
ρ0
ρA
Newton 1686
€
c =γ p0
ρ0
![Page 20: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/20.jpg)
with0
02
p
c
but
€
p0 = ρ0RT
€
c 2 = γ RT
Wave Equation
2
2
2
2
2
1
x
p
t
p
cAA
AA
pp
0
0
€
c = γ RTsound speed
![Page 21: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/21.jpg)
Proof:
€
pA (x, t) = f (x − ct)
2
2
2
2
2
1
x
p
t
p
cAA
so
Wave Equation
)(),(
)(),(
2
2
ctxfx
txp
ctxfx
txp
)(),(
)(),(
22
2
ctxfct
txp
ctxfct
txp
2
2
2
2
2)(
1
x
pctxf
t
p
cAA
solution
![Page 22: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/22.jpg)
€
1
c 2
∂ 2 pA
∂t 2 =∂ 2 pA
∂x 2
Wave Equation
solution
• is also a solution
€
p(x, t) = g(x + ct)
• f can be any function
• uAx, ρA and TA also satisfy the wave equation
€
pA (x, t) = f (x − ct)
![Page 23: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/23.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = 0
x
pf(x)
x
pf(x-ct1)
At t = t1 ct1
![Page 24: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/24.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = 0
x
p
![Page 25: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/25.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t1
x
p
ct1
![Page 26: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/26.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t2
x
p
ct2
![Page 27: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/27.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t3
x
p
ct3
![Page 28: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/28.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t4
x
p
ct4
![Page 29: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/29.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t5
x
p
ct5
![Page 30: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/30.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t6
x
p
ct6
![Page 31: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/31.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t7
x
p
ct7
![Page 32: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/32.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t8
x
p
ct8
![Page 33: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/33.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t9
x
p
ct9
![Page 34: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/34.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t10
x
p
ct10
![Page 35: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/35.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t11
x
p
ct11
![Page 36: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/36.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t12
x
p
ct12
![Page 37: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/37.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t13
x
p
ct13
![Page 38: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/38.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t14
x
p
ct14
![Page 39: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/39.jpg)
€
p(x, t) = f (x − ct)
Why is this a propagating wave?
At t = t15
x
p
ct15
€
p(x, t) = g(x + ct) propagates in the = -x direction
![Page 40: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/40.jpg)
€
p(x, t) = f (x − ct) + g(x + ct)Most General Solution
x
p€
p(x, t) = g(x + ct) propagates in the = -x direction
c c
€
f
€
g
![Page 41: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/41.jpg)
€
p(x, t) = f (x − ct)Propagating Wave:
At t = 0
x
f(x)p
pf(x-ct1)
At t = t1 ct1
x
At x = 0
t
f(-t)p
pf(x1/c-t)At x = x1 x1/c
t
![Page 42: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/42.jpg)
Sinusoidal Waves
TAfge
2cos)(..
€
pA (x, t) = Acos2π
Tt −
x
c ⎛ ⎝
⎞ ⎠
⎛ ⎝ ⎜
⎞ ⎠ ⎟ = Acos 2π f t −
x
c ⎛ ⎝
⎞ ⎠
⎛ ⎝ ⎜
⎞ ⎠ ⎟
x
A
λ
t=0
€
pA (x,0) = Acos2πx
cT ⎛ ⎝
⎞ ⎠
λ is the wavelength (spatial period) λ =cT λ distance propagated in one period
temporal angular frequency
€
pA (x, t) = Acos ωt − kx( )
€
ω =2π f
€
k = ω /c wavenumber (spatial angular freq)
T period (s)
f = 1/T frequency (Hz)(# cycles/sec)
T
A
t
p
x=0
€
pA (0, t) = Acos2πt
T ⎛ ⎝
⎞ ⎠
x=x0
t
x0
c
A
![Page 43: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/43.jpg)
Areas and Applicationsof
Acoustics
![Page 44: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/44.jpg)
1) Noise
· usually something you want to get rid of
· Noise pollution- highways, aircraft, sonic
boom- machinery-OSHA
· submarines- quiet <----> undetectable
2) Audio
· loudspeakers· earphones· microphones· telephones· recording (tape, CD etc)· sirens and alarms
![Page 45: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/45.jpg)
3) Environmental Science• Oceanography Ocean is opaque to EM radiation but transparent to sound
- remote sensing of temperature & current - current meters- ocean acoustic tomography (T & C over
wide areas)- global warming (Heard Island
experiment) - monitoring surface and internal gravity
waves - telemetry (for oceanographic
instrumentation)- tracking of marine animals- acoustic releases
• Geophysics- seismology (compressional waves)- ocean bottom mapping
• Meteorology- atmospheric sounding
![Page 46: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/46.jpg)
4) Physical Science
• chemical and structural relaxation (sound absorption)• chemistry (enhanced reactions)• liquid helium (“second sound” etc)• Brillouin scattering (scattering of sound by light GHz region)• solid state physics (phonons)• photoacoustic spectroscopy•· cavitation •· sonoluminescence (fusion)
![Page 47: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/47.jpg)
5) Naval Applications
(exploit “transparency” of ocean) • undersea surveillance• detection and localization
-active or passive• mine warefare
-detection-activation
• depth sounding - bottom mapping• obstacle avoidance• ice thickness • communication• submarine stealth (TS and noise reduction)• homing devices - torpedo
![Page 48: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/48.jpg)
6) Other Military Applications• artillery localization• intruder detection• land mine localization• treaty verification
7) Architectural• room acoustics• theater, auditoriums etc• sound isolation
![Page 49: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/49.jpg)
8) Bioacoustics (animals & sound ) • animal sonar (dolphins & bats)
-countermeasures• acoustic behavior (bird songs, mating calls,
animal sounds, avoidance reflex etc)• weapon? (whales & dolphins)• communication (whales, elephants)• physiological (how do fish, insects, frogs,
whales hear?)• Effects of noise on animals
![Page 50: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/50.jpg)
9) Hearing and Speech
· physiology
· audiology (quantitative measurement of hearing capacity)
· speech synthesis· speech recognition· speech therapy· hearing aids· effects of noise on hearing and speech· psychoacoustics (psychology of hearing)
10)Music
· instruments · synthesizers· musical theory· reproduction of music
![Page 51: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/51.jpg)
11) Medicine ultrasound therapy
- provide heat - destroy tumors etc
acoustic imaging- scanning- echocardiograms- fetal images- tomography- holography
blood flow (Doppler devices) stethoscopes
-fetal heartbeat•lithotripsy (shock waves break up kidney and bladder stones)•drug delivery• sonic therapy for cystic fibrosis• intraocular pressure•effects of sound and vibration on organs and tissue
![Page 52: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/52.jpg)
12) Resource management• fish finding fish counting fish and manatee “scaring” seismic prospecting oil well logging
13) Microscopy• Better than optical - approach electron microscopes, Biological
-“different” contrasts Integrated circuit inspection
- ability to examine individual layers
![Page 53: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/53.jpg)
14) Commercial
ultrasonic cleaningsonic drills
burglar alarmsinsect repellantsultrasonic atomizers -inkjet printersrange finders for camerasmeasurement of distance and heightAcoustic refrigerators
15) Electrical Engineering (Signal processing )
· SAW devices· acoustic delay lines
![Page 54: Mechanical Systems Laboratory ME 4053 Acoustics Lecture 1 Fall 2010 ©2010 Peter Rogers Georgia Tech](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649de85503460f94ae2ff1/html5/thumbnails/54.jpg)
16) Quality control ultrasonic flaw detection acoustic emissions
-reactors-bone
“Weevil” detector
17) Miscellaneous
· enhancement of combustion· undersea search (Nessie, Titanic etc.)· acoustic levitation (processing in zero g)· sensors for control systems· tornado detector · acoustic aids for the blind· espionage
Others?