are sensitive barometers
that can measure air pressure
with high precision. Microbarometers typically have a resolution of microbars
(μbar) or pascals
(Pa), while ordinary barometers can only resolve in hectopascals (hPa) or millibars (mbar). Recording microbarometers, or microbarographs
, distributed around the world are used to monitor compliance with the Comprehensive Nuclear-Test-Ban Treaty
by detecting the infrasound
signature of a nuclear explosion
, which can propagate
for very long distances. By analyzing the data received at several of these monitoring stations, the location and yield of the explosion can be determined.
A microbarometer used as a pressure altimeter would be able to resolve altitude differences on the order of centimeters, but for the presence of infrasonic noise such as microbaroms.