microbarograph


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microbarograph

[¦mī·krō′bar·ə‚graf]
(meteorology)
A type of aneroid barograph designed to record atmospheric pressure variations of very small magnitude.

Microbarograph

 

an instrument for high-precision automatic recording of variations in atmospheric pressure.

The sensing element of a microbarograph is a bellows (aneroid) unit, which is mounted in a miniature pressure chamber that has good thermal insulation. The interior volume of the pressure chamber can be in communication with the atmosphere only if a valve is open, but the inner space of the aneroid capsule is in continuous communication with the atmosphere through a tube. If the valve is closed, a change in the atmospheric pressure relative to the original value in the pressure chamber causes a deformation of the aneroid capsule, which is transmitted to a rod and then, by means of a system of levers, to a pointer. The recorder scale of a microbarograph is 10–30 times larger than for an ordinary barograph. The period of rotation of the drum and its chart may be 10 min to 4—6 hr.

WORKS

Kedrolivanskii, V. G., and M. S. Sternzat. Meteorologicheskie pribory. Leningrad, 1953.

S. I. NEPOMNIASHCHII

microbarograph

microbarograph
A sensitive barograph that records very small transient changes in atmospheric pressure. A microbarograph permits reading directly to 1/10 of a millibar.
References in periodicals archive ?
The microbarograph array (Hooke 1979; Bedard and Georges 2000) consisted of four ground sites, one located near the base of the tower and three others located approximately 128 m away, capable of measuring the speed and direction of various infrasound signals.
At the total solar eclipse of July 11, 1991, my Weathermeasure microbarograph indicated a series of tiny but distinct ripples (typically 100 microbars) in atmospheric pressure between third and fourth contact.
Project teams deployed over 200 measurement devices of more than 24 different types, ranging from SoDAR (Sonic Detection And Ranging) and LiDAR (Light Detection And Ranging) units to wind profiling radars, radiative flux systems, and microbarographs. Capable of measuring wind conditions throughout the turbine rotor layer and aloft along with other variables, such as cloud position or air temperature, this broad combination of devices has allowed a much deeper insight into wind activity than a conventional anemometer.