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Galvanometer01:25

Galvanometer

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Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
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Electronic Distance Measuring Instruments01:30

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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Leveling Equipment01:18

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As leveling involves measuring vertical distances relative to a horizontal line of sight, it requires a graduated rod, called a level rod, for vertical measurements and an instrument called a level for a horizontal sight line. A level includes a high-powered telescope with a mechanism for leveling to ensure the line of sight is horizontal when the bubble in the spirit level is centered. Leveling rods, made of wood, metal, or fiberglass, are graduated in feet or meters and commonly used in two-...
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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
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Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
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Compact GaN-based optical inclinometer.

Xiaoshuai An, Hongying Yang, Yumeng Luo

    Optics Letters
    |March 1, 2022
    PubMed
    Summary

    This study presents a compact optical inclinometer using a GaN-on-sapphire chip and ethanol. This novel device accurately measures inclination angles, offering high repeatability and stability for diverse applications.

    Area of Science:

    • Optoelectronics
    • MEMS (Micro-Electro-Mechanical Systems)

    Background:

    • Traditional inclinometers can be bulky and expensive.
    • Miniaturization of sensing devices is crucial for advanced applications.

    Purpose of the Study:

    • To propose and demonstrate a sub-centimeter sized, compact optical inclinometer.
    • To leverage optoelectronic principles for precise angle measurement.

    Main Methods:

    • Fabrication of a 1x1 mm² GaN-on-sapphire chip with integrated light-emitting diode and photodetector.
    • Integration with a 5 mm diameter spherical glass cavity containing ethanol as a liquid pendulum.
    • Measurement of photocurrent variations due to immersion depth changes with inclination.

    Main Results:

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  • Accurate inclination angle measurement from -60° to +60°.
  • Linear response within -40° to +40° with a sensitivity of 19.4 nA/° and resolution of 0.003°.
  • Demonstrated high repeatability and stability through dynamic experiments.

    • Conclusions:

    • The developed optical inclinometer offers a compact, stable, and accurate solution for inclination sensing.
    • The device's performance paves the way for widespread adoption in various fields.
    • This technology advances miniaturized sensing capabilities in optoelectronics.