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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:24 |
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Conference: Bucharest University Faculty of Physics 2023 Meeting
Section: Physics Education
Title:
Microbarometers - infrasound sensors
Authors:
Iulian STANCU(1)
Affiliation:
1) National College "Gheorghe Șincai" Bucharest, Romania
E-mail
iulianstancu10@yahoo.com
Keywords:
infrasound, atmospheric pressure, hysteresis, physics education
Abstract:
Infrasound measurements are achieved through a dedicated set of equipment, called "infrasound measurement chain". Most modern ones consist of an infra sensor, the acquisition unit and, when necessary, a reducing wind noise filter. The sensor measures atmospheric pressure changes over a broad range of values and offers a dynamic signal recorder. The fact that nuclear explosions generate infrasound stimulated an increased interest in infrasound sensors and led to their application also in other areas. Infrasound sensor aneroid capsule consists of an aneroid capsule and an linear variable differential transducer that measures the variable air pressure changes within a defined cavity. A magnet and coil velocity transducer can be employed as a detector aneroid capsule. Such sensor is robust, has very low noise and provides a response in accordance with the characteristics of the background noise. Some infrasound sensors use precision quartz crystal resonators to reduce the stress induced by pressure changes. The resonance frequency varies depending on the pressure generated by stress. They are described as transducers with remarkable repeatability, low hysteresis, and excellent stability.
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