Automatic tuning of Bragg condition in a Radio-Acoustic System for PBL temperature profile measurement

G. Bonino, P. Trivero

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

A Radio-Acoustic Sounding System (RASS) with acoustic wavelength λa ~ 1 m was designed and successfully tested. The system proved to be capable of measuring the vertical temperature profile in the Planetary Boundary Layer (PBL) with an accuracy and vertical resolution comparable to that of traditional apparatus (radiothermosondes borne by tethered or disposable balloons, thermosondes borne by aircraft and so on), yet combined with the advantages typical of remote sensing techniques. Up to the summer of 1983 the system needed attendance by an operator who had to identify the acoustic sounding frequency affording the fundamental condition of Bragg resonance between acoustic and radio wavelengths. Features and performance of the new completely automatic RASS arrangement are presented. These include the possibility of obtaining average thermal vertical profiles at preset time intervals. Maximum range of measurements obtained in about 1000 1 2-h averages was: in 90% of cases ≥ 600m; in 50% of cases ≥ 1100m. Such results indicate the usefulness of automatic RASS as a tool for meteorological purposes and for the application of air pollution control strategies.

Lingua originaleInglese
pagine (da-a)973-978
Numero di pagine6
RivistaAtmospheric Environment
Volume19
Numero di pubblicazione6
DOI
Stato di pubblicazionePubblicato - 1985
Pubblicato esternamente

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