Doppler
Approaching siren's change
Doppler refers to Christian Doppler, the Austrian physicist who in 1842 described the frequency shift in waves caused by relative motion between source and observer.
His name attaches to numerous scientific terms: the Doppler effect, Doppler shift, Doppler radar.
The Doppler reading showed the fetus had a strong heartbeat. (Lowercase doppler is informal shorthand for the technology.)
shift
Movement or work period
- redshiftWavelength stretch from recession
- blueshiftLight compressed by approach
- frequencyRate of recurrence
wavelength · velocity · relativity · spectrum · light · sound · source · observer · motion · approaching
Christian
Adherent of the gospel
- prenatal testsamniocentesis, ultrasound, nuchal translucency, genetic screening, blood test
- medical equipmentstethoscope, AED, syringe, hospital bed, surgical table
- EponymsDarwinian, Alzheimer's disease, Freudian slip, cardigan, Parkinson's disease
- childbirthcontractions, labor, pushing, dilation, birth
- medical imagingCT scan, MRI, X-ray, PET scan, MRI scan
- radiologyX-ray, CT scan, MRI machine, MRI, radiologist
dynamic vs. static measurement
Dopplerstatic
Without motion or change
stationary · fixed · invariant · unshifted · steady-state
motion vs. stationarity
Dopplerstationary
Not in motion
static · at rest · motionless · fixed · immobile
- Doppler effectWave compression from motion
- Doppler radarMotion-sensing weather instrument
- Doppler shiftFrequency change from movement
- doppler ultrasoundImaging of circulation movement