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Sensores de Micro-ondas Controlados Opticamente para Diagnóstico Biomédico
Paperback
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ISBN10: 6630017870
ISBN13: 9786630017878
Publisher: Edicoes Nosso Conhecimento
Published: Sep 21 2026
Pages: 92
Weight: 0.30
Height: 0.22 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786630017878
Publisher: Edicoes Nosso Conhecimento
Published: Sep 21 2026
Pages: 92
Weight: 0.30
Height: 0.22 Width: 6.00 Depth: 9.00
Language: Portuguese
Este livro apresenta o design, desenvolvimento e validação de um inovador sensor de micro-ondas controlado opticamente para a deteção não invasiva e em tempo real da concentração de ureia na urina humana, abordando limitações crÃticas dos ensaios bioquÃmicos convencionais, que são dispendiosos, demorados e inadequados para aplicações no ponto de cuidados (point-of-care). O sensor proposto opera a 1,22 GHz e integra de forma única três elementos de design sinérgicos: um indutor espiral circular (CSI) combinado com um condensador interdigital (IDC) para formar uma estrutura ressonante de elevado Q que concentra os campos eletromagnéticos na região de deteção; stubs fractais de Hilbert que minimizam os efeitos de difração e otimizam a adaptação de impedância; e uma fotorresistência (LDR) que possibilita um novo mecanismo de transdução hÃbrido ótico-micro-ondas, no qual a transparência ótica da urina - inversamente correlacionada com a sua concentração de ureia - modula a resistência do LDR e, assim, altera diretamente a magnitude da perda de inserção (S₂₁) à frequência de ressonância fixa. Validação numérica recorrendo ao CST Microwave Studio e testes experimentais em amostras de urina humana de 15 doentes.
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