Microbarometer

Microbarometers 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 [1] can only resolve in hectopascals (hPa) or millibars (mbar). Recording microbarometers, or microbarographs, distributed around the world are planned to be used to monitor compliance with the Comprehensive Nuclear-Test-Ban Treaty (upon entry into force) 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.