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  2. Surface acoustic wave sensor - Wikipedia

    en.wikipedia.org/wiki/Surface_acoustic_wave_sensor

    Surface acoustic wave sensor. Surface acoustic wave sensors are a class of microelectromechanical systems (MEMS) which rely on the modulation of surface acoustic waves to sense a physical phenomenon. The sensor transduces an input electrical signal into a mechanical wave which, unlike an electrical signal, can be easily influenced by physical ...

  3. Noise floor - Wikipedia

    en.wikipedia.org/wiki/Noise_floor

    Noise floor. Measurement from a spectrum analyzer showing a noise-like measurement from an unspecified component. In signal theory, the noise floor is the measure of the signal created from the sum of all the noise sources and unwanted signals within a measurement system, where noise is defined as any signal other than the one being monitored.

  4. Total air temperature - Wikipedia

    en.wikipedia.org/wiki/Total_air_temperature

    Total air temperature is an essential input to an air data computer in order to enable the computation of static air temperature and hence true airspeed . The relationship between static and total air temperatures is given by: where: static air temperature, SAT ( kelvins or degrees Rankine) total air temperature, TAT (kelvins or degrees Rankine ...

  5. Noise temperature - Wikipedia

    en.wikipedia.org/wiki/Noise_temperature

    Noise temperature. In electronics, noise temperature is one way of expressing the level of available noise power introduced by a component or source. The power spectral density of the noise is expressed in terms of the temperature (in kelvins) that would produce that level of Johnson–Nyquist noise, thus: where:

  6. Underwater acoustics - Wikipedia

    en.wikipedia.org/wiki/Underwater_acoustics

    Underwater acoustics (also known as hydroacoustics) is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water, its contents and its boundaries. The water may be in the ocean, a lake, a river or a tank. Typical frequencies associated with underwater acoustics are between 10 ...

  7. Sound pressure - Wikipedia

    en.wikipedia.org/wiki/Sound_pressure

    TL. v. t. e. Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average or equilibrium) atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone, and in water with a hydrophone. The SI unit of sound pressure is the pascal (Pa).

  8. Ambient noise level - Wikipedia

    en.wikipedia.org/wiki/Ambient_noise_level

    Ambient noise level is measured with a sound level meter. [ 4] It is usually measured in dB relative to a reference pressure of 0.00002 Pa, i.e., 20 μPa (micropascals) in SI units. [ 5] This is because 20 μPa is the faintest sound the human ear can detect. [ 5] A pascal is a newton per square meter. The centimeter-gram-second system of units ...

  9. Automated airport weather station - Wikipedia

    en.wikipedia.org/wiki/Automated_airport_weather...

    The measurement of temperature is simple compared to the dew point. Operating under the principle that electrical resistance varies with temperature, a platinum wire resistive temperature device measures the ambient air temperature. The current ASOS thermometer is designated the HO-1088, though some older systems still utilize the HO-83.