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  2. Altimeter setting - Wikipedia

    en.wikipedia.org/wiki/Altimeter_setting

    It is designed to read zero at sea level in the vicinity of the aerodrome, unlike QNH which will not read precisely zero at sea-level. [2] Related to the altimeter settings are: TA [3] - Transition Altitude - altitude at which the pilot changes the aircraft's altimeter setting (usually from QNH) to standard pressure (1013.25 hPa)

  3. Flight level - Wikipedia

    en.wikipedia.org/wiki/Flight_level

    The altimeter setting used is the ISA sea level pressure of 1013 hPa or 29.92 inHg. The actual surface pressure will vary from this at different locations and times. Therefore, by using a standard pressure setting, every aircraft has the same altimeter setting, and vertical clearance can be maintained during cruise flight. [1]

  4. Aeronautical Code signals - Wikipedia

    en.wikipedia.org/wiki/Aeronautical_Code_signals

    Altimeter reading when subscale set 1013.25 hPa (atmospheric pressure at sea level in the International Standard Atmosphere) [2] QNH: The pressure set on the subscale of the altimeter so that the instrument indicates its height above sea level (the altimeter will read runway elevation when the aircraft is on the runway). [1] Request Leeds QNH

  5. QFF - Wikipedia

    en.wikipedia.org/wiki/QFF

    QFF is the location value plotted on surface synoptic chart and is closer to reality than QNH, though it is only indirectly used in aviation. [citation needed] Another method [which?]: The derivation assumes that an isothermal layer at the station temperature extends to the sea level.

  6. Quantum microscopy - Wikipedia

    en.wikipedia.org/wiki/Quantum_microscopy

    Later, the same microscope was employed as a photonic force microscope, tracking a granule as it diffused spatially. [19] This allowed quantum enhanced resolution to be demonstrated, and for this to be achieved in a far-sub-diffraction limited microscope. Squeezed light has also been used to improve nonlinear microscopy. [20]

  7. Automated airport weather station - Wikipedia

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

    The hygrometer measures the dew point by directing a light beam from a small infrared diode to the surface of the mirror at an angle of 45 degrees. Two photo transistors are mounted so they measure a high degree of reflected light when the mirror is clear (direct) and scattered light when the mirror is clouded with visible condensation ...

  8. Optical microscope - Wikipedia

    en.wikipedia.org/wiki/Optical_microscope

    The optical microscope, also referred to as a light microscope, is a type of microscope that commonly uses visible light and a system of lenses to generate magnified images of small objects. Optical microscopes are the oldest design of microscope and were possibly invented in their present compound form in the 17th century.

  9. Dark-field microscopy - Wikipedia

    en.wikipedia.org/wiki/Dark-field_microscopy

    Diagram illustrating the light path through a dark-field microscope. The steps are illustrated in the figure where an inverted microscope is used. Light enters the microscope for illumination of the sample. A specially sized disc, the patch stop (see figure), blocks some light from the light source, leaving an outer ring of illumination. A wide ...

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