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Related Concept Videos

Doppler Effect - I00:56

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The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...
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Doppler Effect - II01:05

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The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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What are Estimates?01:06

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It isn't easy to measure a parameter such as the mean height or the mean weight of a population. So, we draw samples from the population and calculate the mean height or mean weight of the individuals in the sample. This sample data acts as a representative measure of the population parameter. These sample statistics are known as estimates. 
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Overhead power transmission lines rely on cables to carry electricity across large distances. To ensure the stability and functionality of these lines, it is crucial to understand the shape and tension experienced by the cables under the influence of their weight.
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Aminoglycosides are a class of antibiotics used to treat various bacterial infections. Clinicians must determine the elimination rate constant (k) and volume of distribution (VD) to optimize therapeutic efficacy and minimize toxicity. The k value represents the rate at which the drug is removed from the body, and the VD reflects the degree to which the drug distributes into body tissues. Accurately estimating these parameters allows healthcare professionals to tailor drug dosing to individual...
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Related Experiment Video

Updated: Feb 2, 2026

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
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Subject Count Estimation by Using Doppler Radar Occupancy Sensor.

Ehsan Yavari, Xiaomeng Gao, Olga Boric-Lubecke

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |November 17, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Doppler radar sensors can detect human presence and count occupants. Received signal strength (RSS) shows promise for accurate occupant number estimation in buildings.

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    Area of Science:

    • Building Automation Systems
    • Sensor Technology
    • Energy Efficiency

    Background:

    • Occupancy information is crucial for energy-saving building automation.
    • Traditional occupancy sensors have limitations in accurately counting individuals.
    • Doppler radar offers advanced capabilities beyond simple presence detection.

    Purpose of the Study:

    • To investigate the potential of Doppler radar for estimating occupant counts.
    • To evaluate the use of Received Signal Strength (RSS) for occupant enumeration.
    • To demonstrate energy-saving opportunities through accurate occupancy data.

    Main Methods:

    • Employing a continuous wave Doppler radar monitoring system.
    • Utilizing Received Signal Strength (RSS) as a proxy for occupant count.
    • Analyzing the relationship between RSS and the number of occupants.

    Main Results:

    • Doppler radar successfully detected human presence.
    • Preliminary results indicate a correlation between RSS and occupant numbers.
    • RSS shows potential as a reliable measure for estimating how many people are in a space.

    Conclusions:

    • Doppler radar is a viable technology for both occupancy detection and counting.
    • Received Signal Strength (RSS) is a promising metric for occupant number estimation.
    • Accurate occupant counts can significantly enhance building automation and energy efficiency.