{"title":"Autonomous Long-Term In-Situ Particle Sizing Using A New Laser Diffraction Instrument","authors":"Y. Agrawal, H.C. Pottsmith","doi":"10.1109/OCEANS.1989.587120","DOIUrl":null,"url":null,"abstract":"A new sensor system is described for unattended long-term observation of particle size spectra in the sea. The instrument is based on the principle that, at small angles, scattering by a particle is substantially identical to diffraction through an aperture of equal diameter, regardless of the particle refractive index. A CCD array records near-forward scattering of light from a laser beam. The inversion of observed scattered intensity over a range of small angles is required to obtain size data. A survey of the inverse methods is included. The data from the CCD line array permits a new level of detail in analysis of the in-situ data. The sensor system can be easily programmed for an arbitrary schedule of sampling. Furthermore, by incorporating the concepts of a settling tube, the settling velocity spectrum of the particles can be determined independently.","PeriodicalId":331017,"journal":{"name":"Proceedings OCEANS","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1989-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"12","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings OCEANS","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/OCEANS.1989.587120","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 12
Abstract
A new sensor system is described for unattended long-term observation of particle size spectra in the sea. The instrument is based on the principle that, at small angles, scattering by a particle is substantially identical to diffraction through an aperture of equal diameter, regardless of the particle refractive index. A CCD array records near-forward scattering of light from a laser beam. The inversion of observed scattered intensity over a range of small angles is required to obtain size data. A survey of the inverse methods is included. The data from the CCD line array permits a new level of detail in analysis of the in-situ data. The sensor system can be easily programmed for an arbitrary schedule of sampling. Furthermore, by incorporating the concepts of a settling tube, the settling velocity spectrum of the particles can be determined independently.