Natural and laser - induced cavitation in corn stems : on the mechanisms of acoustic emissions
Water in plant xylem is often superheated, and therefore in a meta-stable state. Under certain conditions, it may suddenly turn from the liquid to the vapor state. This cavitation process produces acoustic emissions. We report the measurement of ultrasonic acoustic emissions (UAE) produced by natural and induced cavitation in corn stems. We induced cavitation and UAE in vivo, in well controlled and reproducible experiments, by irradiat- ing the bare stem of the plants with a continuous-wave laser beam. By tracing the source of UAE, we were able to detect absorption and frequency filtering of the UAE propagat- ing through the stem. This technique allows the unique possibility of studying localized embolism of plant conduits, and thus to test hypotheses on the hydraulic architecture of plants. Based on our results, we postulate that the source of UAE is a transient - cavity oscillation triggered by the disruptive effect of cavitation inception.
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Subjects: | CAVITATION, ACOUSTIC EMISSION, |
Online Access: | http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2012fernandez1 |
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snrd:2012fernandez12021-10-15T16:56:07Z Fernández, E. Fernández, R. J. Bilmes, G. M. 2012 Water in plant xylem is often superheated, and therefore in a meta-stable state. Under certain conditions, it may suddenly turn from the liquid to the vapor state. This cavitation process produces acoustic emissions. We report the measurement of ultrasonic acoustic emissions (UAE) produced by natural and induced cavitation in corn stems. We induced cavitation and UAE in vivo, in well controlled and reproducible experiments, by irradiat- ing the bare stem of the plants with a continuous-wave laser beam. By tracing the source of UAE, we were able to detect absorption and frequency filtering of the UAE propagat- ing through the stem. This technique allows the unique possibility of studying localized embolism of plant conduits, and thus to test hypotheses on the hydraulic architecture of plants. Based on our results, we postulate that the source of UAE is a transient - cavity oscillation triggered by the disruptive effect of cavitation inception. application/pdf 10.4279/PIP.040003 http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2012fernandez1 eng info:eu-repo/semantics/openAccess openAccess http://ri.agro.uba.ar/greenstone3/library/page/biblioteca#section4 Papers in Physics Vol.4 1-8 http://www.papersinphysics.org CAVITATION ACOUSTIC EMISSION Natural and laser - induced cavitation in corn stems : on the mechanisms of acoustic emissions info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion publishedVersion |
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CAVITATION ACOUSTIC EMISSION CAVITATION ACOUSTIC EMISSION Fernández, E. Fernández, R. J. Bilmes, G. M. Natural and laser - induced cavitation in corn stems : on the mechanisms of acoustic emissions |
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Water in plant xylem is often superheated, and therefore in a meta-stable state. Under certain conditions, it may suddenly turn from the liquid to the vapor state. This cavitation process produces acoustic emissions. We report the measurement of ultrasonic acoustic emissions (UAE) produced by natural and induced cavitation in corn stems. We induced cavitation and UAE in vivo, in well controlled and reproducible experiments, by irradiat- ing the bare stem of the plants with a continuous-wave laser beam. By tracing the source of UAE, we were able to detect absorption and frequency filtering of the UAE propagat- ing through the stem. This technique allows the unique possibility of studying localized embolism of plant conduits, and thus to test hypotheses on the hydraulic architecture of plants. Based on our results, we postulate that the source of UAE is a transient - cavity oscillation triggered by the disruptive effect of cavitation inception. |
format |
info:eu-repo/semantics/article |
topic_facet |
CAVITATION ACOUSTIC EMISSION |
author |
Fernández, E. Fernández, R. J. Bilmes, G. M. |
author_facet |
Fernández, E. Fernández, R. J. Bilmes, G. M. |
author_sort |
Fernández, E. |
title |
Natural and laser - induced cavitation in corn stems : on the mechanisms of acoustic emissions |
title_short |
Natural and laser - induced cavitation in corn stems : on the mechanisms of acoustic emissions |
title_full |
Natural and laser - induced cavitation in corn stems : on the mechanisms of acoustic emissions |
title_fullStr |
Natural and laser - induced cavitation in corn stems : on the mechanisms of acoustic emissions |
title_full_unstemmed |
Natural and laser - induced cavitation in corn stems : on the mechanisms of acoustic emissions |
title_sort |
natural and laser - induced cavitation in corn stems : on the mechanisms of acoustic emissions |
url |
http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2012fernandez1 |
work_keys_str_mv |
AT fernandeze naturalandlaserinducedcavitationincornstemsonthemechanismsofacousticemissions AT fernandezrj naturalandlaserinducedcavitationincornstemsonthemechanismsofacousticemissions AT bilmesgm naturalandlaserinducedcavitationincornstemsonthemechanismsofacousticemissions |
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1756546324572930048 |