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  2. Current meter - Wikipedia

    en.wikipedia.org/wiki/Current_meter

    The devices are usually equipped with additional optional sensors. Travel time instruments determine water velocity by at least two acoustic signals, one up stream and one down stream. By precisely measuring the time to travel from the emitter to the receiver, in both directions, the average water speed can be determined between the two points.

  3. Liquid-mirror telescope - Wikipedia

    en.wikipedia.org/wiki/Liquid-mirror_telescope

    The force of gravity (red), the buoyancy force (green), and the resultant centripetal force (blue) In the following discussion, represents the acceleration due to gravity, represents the angular speed of the liquid's rotation, in radians per second, is the mass of an infinitesimal parcel of liquid material on the surface of the liquid, is the distance of the parcel from the axis of rotation ...

  4. Automatic meter reading - Wikipedia

    en.wikipedia.org/wiki/Automatic_meter_reading

    Automatic meter reading (AMR) is the technology of automatically collecting consumption, diagnostic, and status data from water meter or energy metering devices (gas, electric) and transferring that data to a central database for billing, troubleshooting, and analyzing. This technology mainly saves utility providers the expense of periodic ...

  5. Water metering - Wikipedia

    en.wikipedia.org/wiki/Water_metering

    A typical water meter register showing a meter reading of 8.3 gallons. Notice the black "1" on the odometer has not yet fully turned over, so only the red hand is read. Water meters connected to remote reading devices through three-wire cables. There are several types of registers on water meters.

  6. Water detector - Wikipedia

    en.wikipedia.org/wiki/Water_detector

    A water detector is an electronic device that is designed to detect the presence of water for purposes such as to provide an alert in time to allow the prevention of water leakage. A common design is a small cable or device that lies flat on a floor and relies on the electrical conductivity of water to decrease the resistance across two contacts.

  7. Wave radar - Wikipedia

    en.wikipedia.org/wiki/Wave_radar

    This sensor is used as an air gap (bridge clearance) sensor in NOAA's PORTS system. Another example is the WaveRadar REX, which is a derivative of a Rosemount tank radar. Digitized sea clutter image. From data on the elevation of the surface of the water at three or more locations, a directional spectrum of wave height can be computed.

  8. Photometry (optics) - Wikipedia

    en.wikipedia.org/wiki/Photometry_(optics)

    The lumen is defined as amount of light given into one steradian by a point source of one candela strength; while the candela, a base SI unit, is defined as the luminous intensity of a source of monochromatic radiation, of frequency 540 terahertz, and a radiant intensity of 1/683 watts per steradian.

  9. Refractometer - Wikipedia

    en.wikipedia.org/wiki/Refractometer

    Measuring combination of an automatic refractometer and a density meter as widely used in the flavors and fragrances industry Today's laboratories do not only want to measure the refractive index of samples, but several additional parameters like density or viscosity to perform efficient quality control.

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