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  2. Density meter - Wikipedia

    en.wikipedia.org/wiki/Density_meter

    A density meter (densimeter) is a device which measures the density of an object or material. Density is usually abbreviated as either ρ {\displaystyle \rho } or D {\displaystyle D} . Typically, density either has the units of k g / m 3 {\displaystyle kg/m^{3}} or l b / f t 3 {\displaystyle lb/ft^{3}} .

  3. Microwave radiometer - Wikipedia

    en.wikipedia.org/wiki/Microwave_radiometer

    A microwave radiometer (MWR) is a radiometer that measures energy emitted at one millimeter-to-metre wavelengths (frequencies of 0.3–300 GHz) known as microwaves. Microwave radiometers are very sensitive receivers designed to measure thermally-emitted electromagnetic radiation. They are usually equipped with multiple receiving channels to ...

  4. Microwave cavity - Wikipedia

    en.wikipedia.org/wiki/Microwave_cavity

    The microwaves bounce back and forth between the walls of the cavity. At the cavity's resonant frequencies they reinforce to form standing waves in the cavity. Therefore, the cavity functions similarly to an organ pipe or sound box in a musical instrument, oscillating preferentially at a series of frequencies, its resonant frequencies.

  5. Microwave - Wikipedia

    en.wikipedia.org/wiki/Microwave

    He investigated cooking with microwaves and invented the microwave oven, consisting of a magnetron feeding microwaves into a closed metal cavity containing food, which was patented by Raytheon on 8 October 1945. Due to their expense microwave ovens were initially used in institutional kitchens, but by 1986 roughly 25% of households in the U.S ...

  6. Densitometer - Wikipedia

    en.wikipedia.org/wiki/Densitometer

    Ensuring x-ray films are within code-required density ranges and comparing relative material thicknesses in industrial radiography; Process control of density dot gain, dot area & ink trapping. Densitometer readings will be different for different types of printing process & substrates.

  7. Category:Density meters - Wikipedia

    en.wikipedia.org/wiki/Category:Density_meters

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  8. Microwave power meter - Wikipedia

    en.wikipedia.org/wiki/Microwave_power_meter

    A microwave power meter is an instrument which measures the electrical power at microwave frequencies typically in the range 100 MHz to 40 GHz. Usually a microwave power meter will consist of a measuring head which contains the actual power sensing element, connected via a cable to the meter proper, which displays the power reading.

  9. Horn antenna - Wikipedia

    en.wikipedia.org/wiki/Horn_antenna

    Probably the most photographed and well-known example is the 15-meter-long (50-foot) Holmdel Horn Antenna [21] at Bell Labs in Holmdel, New Jersey, with which Arno Penzias and Robert Wilson discovered cosmic microwave background radiation in 1965, for which they won the 1978 Nobel Prize in Physics.

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