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https://hdl.handle.net/1822/49642
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Campo DC | Valor | Idioma |
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dc.contributor.author | Correia, Ramiro Gomes | por |
dc.contributor.author | Pimenta, Sara Filomena Ribeiro | por |
dc.contributor.author | Minas, Graça | por |
dc.date.accessioned | 2018-01-24T15:32:51Z | - |
dc.date.issued | 2017-06-01 | - |
dc.identifier.issn | 1530-437X | por |
dc.identifier.uri | https://hdl.handle.net/1822/49642 | - |
dc.description.abstract | Optical techniques, such as spectrophotometry, have been referred as the tools capable of detect early stages of gastrointestinal cancers, due to their exquisite sensitivity to some intrinsic biomarkers present on the gastrointestinal tissues. An integrated CMOS optical detection microsystem, comprising photodetectors and light-to-frequency converters, was designed, fabricated, and characterized. The viability of its use in spectrophotometric measurements, specifically extracting diffuse reflectance signals between 350 nm and 750 nm from phantoms, was evaluated. The CMOS fabricated photodetector that better fits the application under this paper is based on an n+/p-epilayer photodiode with a responsivity of 186 mA/W at lambda = 600 nm. Its light-to-frequency converter fits an area of 250 x 70 mu m(2), a sensitivity of 28 Hz/nA, a spectral resolution of 9 MHz, a power consumption of 1 mW, and a linear response (R-2 > 0.99) in the range of currents for this application, allowing producing a digital signal with a frequency proportional to the photodiode current and avoiding the need of an expensive readout optical microsystem. The measurements, using the reported device, on diffuse reflectance signals from phantoms agree with values obtained with commercial equipment. | por |
dc.description.sponsorship | This work was supported in part by FEDER funds through the Eixo I do Programa Operacional Fatores de Competitividade QREN under Project COMPETE: FCOMP-01-0124-FEDER-020241, in part by FCT-Fundação para a Ciência e a Tecnologia under Project PTDC/EBBEBI/120334/2010 and Project UID/EEA/04436/2013, and in part by FEDER funds through the COMPETE 2020-Programa Operacional Competitividade e Internacionalizacao under Project POCI-01-0145-FEDER-006941. The work of R. G. Correia was supported by FCT for the Ph.D. under Grant SFRH/BD/70467/2010. The work of S. Pimenta was supported by FCT for the Ph.D. under Grant SFRH/BD/87605/2012. | por |
dc.language.iso | eng | por |
dc.publisher | IEEE | por |
dc.relation | info:eu-repo/grantAgreement/FCT/5876/147325/PT | por |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F70467%2F2010/PT | por |
dc.relation | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F87605%2F2012/PT | por |
dc.relation | info:eu-repo/grantAgreement/FCT/5876-PPCDTI/120334/PT | - |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/120334/PT | - |
dc.rights | restrictedAccess | por |
dc.subject | Gastrointestinal cancers | por |
dc.subject | Light-to-frequency converters | por |
dc.subject | On-chip optical microsystem | por |
dc.subject | Photodetectors | por |
dc.subject | Spectrophotometric measurements | por |
dc.title | CMOS integrated photodetectors and light-to-frequency converters for spectrophotometric measurements | por |
dc.type | article | - |
dc.peerreviewed | yes | por |
oaire.citationStartPage | 3438 | por |
oaire.citationEndPage | 3445 | por |
oaire.citationIssue | 11 | por |
oaire.citationVolume | 17 | por |
dc.date.updated | 2018-01-11T10:41:54Z | - |
dc.identifier.doi | 10.1109/JSEN.2017.2691046 | por |
dc.description.publicationversion | info:eu-repo/semantics/publishedVersion | por |
dc.subject.wos | Science & Technology | - |
sdum.export.identifier | 2298 | - |
sdum.journal | IEEE Sensors Journal | por |
Aparece nas coleções: | DEI - Artigos em revistas internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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IEEE sensors_Ramiro2017.pdf Acesso restrito! | 1,68 MB | Adobe PDF | Ver/Abrir |