Doppler

American  

[dop-ler] / ˈdɒp lər /

noun

1. Christian Johann, 1803–53, Austrian physicist: discovered the Doppler effect.

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Doppler Scientific  

/ dŏp′lər /

1. Austrian physicist and astronomer who in 1842 explained the effect, now named for him, of variations in the frequency of waves as a result of the relative motion of the wave source with respect to the observer.

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Example Sentences

A system called Trackman uses in-stadium, two-directional Doppler radar and synchronized high-speed cameras to quantify everything from a ball’s rotation and velocity to location.

From The Wall Street Journal • Apr. 30, 2026

“At 8:53 a.m. Doppler radar indicated thunderstorms producing heavy rain across the warned area,” an alert warned.

From Los Angeles Times • Dec. 25, 2025

Bilateral lower extremity venous Doppler ultrasounds were performed and revealed chronic venous insufficiency, a benign and common condition, particularly in individuals over the age of 70.

From Slate • Jul. 18, 2025

It also carries the first space-based Doppler radar to track the motions of clouds and probe how they fuel storms.

From Science Magazine • Jun. 5, 2024

This red shift, observed in the spectral lines of distant galaxies and interpreted as a Doppler effect, is the key to cosmology.

From "Cosmos" by Carl Sagan