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  2. List of measuring instruments - Wikipedia

    en.wikipedia.org/wiki/List_of_measuring_instruments

    Black pixels mean no reflectivity (e.g. water surfaces), white pixels mean high reflectivity (e.g. urban areas). Colored pixels can be obtained by combining three gray-scaled images which usually interpret the polarization of electromagnetic waves. The combination R-G-B = HH-HV-VV combines radar images of waves sent and received horizontally ...

  3. Wheel speed sensor - Wikipedia

    en.wikipedia.org/wiki/Wheel_speed_sensor

    For even greater signal accuracy a precision encoder can be used. The functional principles of the two encoders are similar: a multichannel magneto-resistive sensor scans a target wheel with 256 teeth, generating sine and cosine signals. Arctangent interpolation is used to generate rectangular pulses from the sine/cosine signal periods. The ...

  4. Tachometer - Wikipedia

    en.wikipedia.org/wiki/Tachometer

    A tachometer that can indicate up to 7000 RPM (left) A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. [1] The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are ...

  5. Tachymeter (watch) - Wikipedia

    en.wikipedia.org/wiki/Tachymeter_(watch)

    Tachymeter scale on a Citizen watch bezel. A tachymeter (pronounced / t æ ˈ k ɪ m ə t ər /) is a scale sometimes inscribed around the rim of an analog watch with a chronograph.It can be used to conveniently compute the frequency in inverse-hours of an event of a known second-defined period, such as speed (distance over hours) based on travel time (distance over speed), or measure distance ...

  6. Coordinate-measuring machine - Wikipedia

    en.wikipedia.org/wiki/Coordinate-measuring_machine

    A coordinate-measuring machine (CMM) is a device that measures the geometry of physical objects by sensing discrete points on the surface of the object with a probe. Various types of probes are used in CMMs, the most common being mechanical and laser sensors, though optical and white light sensors do exist.

  7. LN-3 inertial navigation system - Wikipedia

    en.wikipedia.org/wiki/LN-3_Inertial_Navigation...

    The LN-3 is a full 3-degrees-of-freedom, 4-gimbal inertial navigator, covering the flight performance envelope of the F-104G which ranged from 0 to 70,000 feet altitude; 0 to Mach 2+ speed, and accelerations from −5 to +9 g.

  8. List of rail transport modelling scale standards - Wikipedia

    en.wikipedia.org/wiki/List_of_rail_transport...

    NMRA standard S-1.2 covers the popular model railway scales and S-1.3 defines scales with deep flanges for model railways with very sharp curves or other garden railway specific design features. In certain NMRA scales an alternative designation is sometimes used corresponding the length of one prototype foot in scale either in millimetres or in ...

  9. Precision - Wikipedia

    en.wikipedia.org/wiki/Precision

    Accuracy and precision, measurement deviation from true value and its scatter; Significant figures, the number of digits that carry real information about a measurement; Precision and recall, in information retrieval: the proportion of relevant documents returned; Precision (computer science), a measure of the detail in which a quantity is ...

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