Resumen: A novel compact dual-wavelength measurement system for absorbance chemical sensing incorporating digital lock-in amplifiers is reported. Its main innovation is the introduction of a reference wavelength to correct the possible non-specific optical changes of the system. The performance of the instrumentation has been tested on a laboratory setup and with integrated optical absorbance sensors. Idioma: Inglés DOI: 10.1088/0957-0233/18/11/026 Año: 2007 Publicado en: MEASUREMENT SCIENCE & TECHNOLOGY 18, 11 (2007), 3443-3450 ISSN: 0957-0233 Factor impacto JCR: 1.297 (2007) Categ. JCR: ENGINEERING, MULTIDISCIPLINARY rank: 10 / 67 = 0.149 (2007) - Q1 - T1 Categ. JCR: INSTRUMENTS & INSTRUMENTATION rank: 19 / 54 = 0.352 (2007) - Q2 - T2 Tipo y forma: Artículo (PostPrint) Área (Departamento): Área Teoría Señal y Comunicac. (Dpto. Ingeniería Electrón.Com.)