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.
Highlights
Temperature measurement in today’s industrial environment requires sensors that are able to measure a large range of temperatures at relatively high speeds in localized areas, especially in machining processes [1,2] or rotor engines [3]
We propose an improved design of a fiber-optic two-color pyrometer using InGaAs photodetectors with low-noise and single high-gain amplifiers to measure temperatures ranging from 170 to 530 ◦ C in very localized areas and at a high speed
The voltage measurements up to 530 ◦ C are within the ±2 V upper limit operation range configured for the data acquisition card
Summary
Temperature measurement in today’s industrial environment requires sensors that are able to measure a large range of temperatures at relatively high speeds in localized areas, especially in machining processes [1,2] or rotor engines [3]. The use of infrared cameras for high-speed measurements in this framework is limited by their low sampling rate operation as well as positioning issues, which make them unsuitable for very localized measurements in difficult-to-access areas [5,6]. In contrast to these sensors, radiation pyrometers overcome the flaws of electrical sensors using a non-contact technique based on the well-known spectral emission pattern from a black body given by the Wien–Planck relation [7], becoming a good choice for measuring temperature in these difficult-to-access rotating areas. This disadvantage can be solved by employing a fiber-optic pyrometer capable of viewing the machining surface directly with a fiber-optic probe, providing localized temperature measurements but with different spot sizes
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