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| show | SOund Navigation And Ranging
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| show | Metric System
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| An underwater projector converts [_____] energy into [_____] energy | show 🗑
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| [T/F]: Energy propagating through acoustic waves has two forms; kinetic and potential energy | show 🗑
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| For a plane wave of sound, which law relates acoustic pressure to particle velocity? [Ohm's, Snell's, Newton's, Energy Conservation] | show 🗑
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| [____] is defined as power over unit area, and is often in terms of watts/m^2 | show 🗑
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| show | Figure of Merit
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| show | True; Performance Figure = SL - (NL - DI)
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| show | Active
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| What are the differences between the Active & Passive SONAR equations? | show 🗑
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| [T/F]: A Passive SONAR system relies on the target to produce a signal so it can be detected | show 🗑
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| show | One micropascal
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| An underwater acoustic hydrophone converts [____] energy into [____] energy. | show 🗑
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| [____] and [____] are 2 fundamental laws used to derive the wave equation for sound wave propagation. | show 🗑
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| show | Shipping noise, tides, surface waves, ocean turbulence, thermal noise. NOT machinery noise/self-noise
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| show | Marine life
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| show | Detection Index; processed signal-to-noise ratio (ARRAY GAIN)
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| Which are true about explosive pulses? a) They're mobile b) Signal perfectly repeated each time explosive used c) Pressure generated by shock wave is function of weight & type of explosive d) Makes series of (+) pressure pulses caused by gas globe | show 🗑
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| [T/F]: Noise is anisotropic in the real ocean | show 🗑
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| show | Acoustic pressure
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| In the given equation, rho*c is often referred to as [____]: p = rho*c*u | show 🗑
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| Which is NOT a SONAR equation? [Active, Passive, Active reverberation, Passive reverberation] | show 🗑
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| A company needs to evaluate where they should drill an oil exploration well in deepwater. Which system is most applicable? [Side scan SONAR, sub-bottom profiler, Seismic, CHIRP] | show 🗑
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| When studying sea sound propogation, the given equation is decribed by which law? cos(theta_2)/cos(theta_1) = c_2/c_1 [Ideal gas, Snell's, Euler's, Wave equation] | show 🗑
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| What are the 4 layers of a typical velocity profile? In order from free surface to seafloor. | show 🗑
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| show | 1) Viscosity of pure water
2) Molecular relaxation of magnesium sulfate > 100 kHz
3) Molecular relaxation of boric acid > 100 kHz
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| What is the name of the widely used relation for evaluating absorption in the ocean, as a sum of the effects of boric aid, magnesium sulfate, and pure water? [D'Alembert, Francois-Garrison, Bernoulli, Euler-LaGrange] | show 🗑
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| If a sound wave 500x that of a plane wave re 1 muPa, then the N level is what? | show 🗑
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| show | True, the fuck
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| If a system is active with the parameters SL = 180 dB, TS = 50 dB, NL = 20 dB, DI = 10 dB, & DT = 25 dB, what is the allowable TL? [48.75 dB, 97.5 dB, 195 dB, 87.5 dB] | show 🗑
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| What is the reverberation active sonar eq? | show 🗑
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| How do you change the reference pressure? | show 🗑
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| Which is NOT an equipment related parameter in the SONAR equations? [Projector SL, Ambient NL, DI_T, DT] | show 🗑
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| show | TS is not medium related
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| [T/F]: When a signal is a unidirectional plane wave (perfectly coherent) & when noise is isotropic, the AG reduces to DI. Since noise is actually anisotropic, AG should be used instead if N & S characteristics are known. | show 🗑
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| show | # of elements in array
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| show | Longitudinal, propogation
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| An offshore installation contractor is required to place a subsea structure on the seabed in deep water. Which system should they use that's independent of depth? [USBL, LBL, Hydrophone array, Side scan SONAR] | show 🗑
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| [T/F]: When a ray is incident from the faster medium, there is no critical angle. Refraction occurs for all angles of incidence, and the angle between the refracted ray and the horizontal will never be less than theta_c. | show 🗑
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| Given that there are an infinite number of ray paths illustrated below, what is the most critical item (actually measured) in underwater acoustics? [time, path length, horizontal range, depth] [Pic: Deepwater sound ray paths] | show 🗑
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| show | Machinery noise is not ambient.
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| Sources of radiated noise include which of the following? [Machinery, propeller, hydrodynamic, thermal] | show 🗑
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| show | Side scan SONAR is used to search the seafloor
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| show | Steradian
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| [T/F]: Sound velocity INCREASES as temperature, salinity, and depth INCREASE. | show 🗑
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| Offshore dev. is trying to determine anchor placements and needs to verify supporting spoil data required by checking variability of soils to depth of 50m. Which system? [USBL, LBL, Sub-bottom, side scan] | show 🗑
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| show | True
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Created by:
rorysunderland
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