An adjustable sensor platform using dual wavelength measurements for optical colorimetric sensitive films

• Type: Article in International Conference Proceedings Book
• Date: 2014

Authors

Machado, C (Author) Other; Gouveia, C (Author) Other; Ferreira, J (Author) Other; Kovacs, B (Author) Other; Jorge, P (Author) Other; Lopes, L (Author) FCUP

Conference proceedings International

Title: Proceedings of IEEE Sensors

Pages: 398-401

13th IEEE SENSORS Conference, SENSORS 2014

2 November 2014 through 5 November 2014

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Scientific classification

FOS: Engineering and technology

Other information

Authenticus ID: P-00G-C35

DOI: 10.1109/icsens.2014.6985018

Abstract (EN): We present a new and versatile sensor platform to readout the response of sensitive colorimetric films. The platform is fully self-contained and based on a switched dual-wavelength scheme. After filtering and signal processing, the system is able to provide self-referenced measures of color intensity changes in the film, while being immune to noise sources such as ambient light and fluctuations in the power source and in the optical path. By controlling the power and the switching frequency between the two wavelengths it is possible to fine tune the output gain as well as the operational range of the sensor for a particular application, thus improving the signal conditioning. The platform uses a micro-controller that complements the analog circuit used to acquire the signal. The latter pre-amplifies, filters and conditions the signal, leaving the micro-controller free to perform sensor linearization and unit conversion. By changing the sensitive film and the wavelength of the light source it is possible to use this platform for a wide range of sensing applications. © 2014 IEEE.

Language: English

Type (Professor's evaluation): Scientific