Sound Pressure Levels

Terms: Sound Pressure Levels (289,000), reference sound pressure (1,210), sound reference level (75), sound pressure (1,250,000), sound levels (1,050,000), sound field strength (20),

Boolean: microphone AND accelerometer (193,000), accelerometer AND gas (301,000), accelerometer AND "hot gas" (273), mems AND accelerometer (366,000), bubble AND accelerometer (124,000), bubble AND gyroscope (83,700), bubble AND gravimeter (296), accelerometer AND pressure (437,000),

Boolean: LIGO AND vibration (17,200),

Terms: thermal accelerometer (308), float accelerometer (78), accelerometer (2,040,000),

Terms: sound level meter (355,000), acoustic measurements (102,000), acoustic noise measurement (495), acoustic thermometry (3,550), long range acoustics (123), acoustic tomography (38,000),

Terms: microphones (22,700,000), ceramic microphones (132), acoustic receivers (1,250),

Terms: self-noise (127,000), equivalent noise level (52,700),

NIST Calibration Services: Acoustic Measurements

Terms: microphone sensitivity (125,000), volts per pascal (265), volts per micropascal (3), sensitive microphones (17,800), ultrasensitive microphones (62), micropascal (1,180), nanopascal (216), picopascal (192), femtopascal (638),

Terms: microphone (41,000,000), hydrophone (341,000), passive acoustic monitoring (1,320), acoustic monitoring (97,600), geophone (108,000), geophones (126,000),

Terms: measuring sound (58,300), measuring sounds (231), acoustic noise (471,000), sound noise (176,000),

Terms: air seismology (95), infrasound (280,000), infrasonic (206,000), infrasonics (17,300),

Terms: sound intensity level (1,800), watts/m2 (20,800),

Terms: anechoic chamber (293,000), anechoic (649,000), anechoic chambers (96,100),

Terms: quietest place on earth (446), vibration-free platform (338), vibration isolation (481,000), noise isolation (196,000), JILA isolation (8), atomic clock (1,400,000),

JILA - AMO Physics Center - AMO Research -  Centers

\xi = \frac{v}{2 \pi f} = \frac{v}{\omega} = \frac{p}{Z \omega} = \frac{p}{ 2 \pi f Z} \,

p = \rho c \omega \xi = Z \omega \xi = { 2 \pi f \xi Z} = \frac{a Z}{\omega} = c \sqrt{\rho E} = \sqrt{\frac{P_{ac} Z}{A}} \,

? meters particle displacement

\xi = \frac{v}{\omega} = \frac{p}{Z_0 \cdot \omega} = \frac{a}{\omega^2} = \frac{1}{\omega}\sqrt{\frac{I}{Z_0}} = \frac{1}{\omega}\sqrt{\frac{E}{\rho}} = \frac{1}{\omega}\sqrt{\frac{P_{ac}}{Z_0 \cdot A}}

a m/s2 Particle acceleration

a = \xi \cdot \omega^2 = v \cdot \omega = \frac{p \cdot \omega}{Z} = \omega \sqrt \frac{J}{Z} = \omega \sqrt \frac{E}{\rho} = \omega \sqrt \frac{P_{ak}}{Z \cdot A}

Sound pressure, Particle displacement,

p0 = 20 µPa (rms) in air ~ auditory threshold at 2kHz

p0 = 1 µPa (rms) in water