Fiber-Optic Pyrometer with Optically Powered Switch for Temperature Measurements

Carmen Vázquez; Sandra Pérez-Prieto; Juan D López-Cardona; Alberto Tapetado; Enrique Blanco; Jorge Moreno-López; David S Montero; Pedro C Lallana

doi:10.3390/s18020483

Fiber-Optic Pyrometer with Optically Powered Switch for Temperature Measurements

Sensors (Basel). 2018 Feb 6;18(2):483. doi: 10.3390/s18020483.

Authors

Carmen Vázquez¹, Sandra Pérez-Prieto², Juan D López-Cardona³, Alberto Tapetado⁴, Enrique Blanco⁵, Jorge Moreno-López⁶, David S Montero⁷, Pedro C Lallana⁸

Affiliations

¹ Electronics Technology Department, University Carlos III of Madrid, 28911 Leganés, Spain. cvazquez@ing.uc3m.es.
² Electronics Technology Department, University Carlos III of Madrid, 28911 Leganés, Spain. saperezp@ing.uc3m.es.
³ Electronics Technology Department, University Carlos III of Madrid, 28911 Leganés, Spain. julopezc@ing.uc3m.es.
⁴ Electronics Technology Department, University Carlos III of Madrid, 28911 Leganés, Spain. atapetad@ing.uc3m.es.
⁵ Electronics Technology Department, University Carlos III of Madrid, 28911 Leganés, Spain. 100303714@alumnos.uc3m.es.
⁶ Electronics Technology Department, University Carlos III of Madrid, 28911 Leganés, Spain.
⁷ Electronics Technology Department, University Carlos III of Madrid, 28911 Leganés, Spain. dsmontero@ing.uc3m.es.
⁸ Electronics Technology Department, University Carlos III of Madrid, 28911 Leganés, Spain. pcontrer@ing.uc3m.es.

Abstract

We report the experimental results on a new infrared fiber-optic pyrometer for very localized and high-speed temperature measurements ranging from 170 to 530 °C using low-noise photodetectors and high-gain transimpedance amplifiers with a single gain mode in the whole temperature range. We also report a shutter based on an optical fiber switch which is optically powered to provide a reference signal in an optical fiber pyrometer measuring from 200 to 550 °C. The tests show the potential of remotely powering via optical means a 300 mW power-hungry optical switch at a distance of 100 m, avoiding any electromagnetic interference close to the measuring point.

Keywords: contactless temperature sensor; fiber-optic; lock-in amplifier; optical chopper; optical switch; power over fiber; pyrometer.