Background-noise reduction in the infrared fiber optic thermometry

Saito, Mitsunori; Nishikawa, Takeo; Shishido, M.

doi:10.1109/ofs.2002.1000738

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…For example, optical lenses in an optical sensor are unable to survive in gas with a temper ature higher than 820 K [9]. Secondly, the background infrared emission [10] and carbon deposition also affect the measurement of an optical sensor [11,12]. Thirdly, an optical system is typically bulky and heavy so that they can hardly be used in aircraft engines [13,14].…”

Section: Introductionmentioning

confidence: 99%

Online monitoring of dynamic tip clearance of turbine blades in high temperature environments

Han

Zhong

Zhu

et al. 2018

Meas. Sci. Technol.

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Minimized tip clearance reduces the gas leakage over turbine blade tips and improves the thrust and efficiency of turbomachinery. An accurate tip clearance sensor, measuring the dynamic clearances between blade tips and the turbine case, is a critical component for tip clearance control. This paper presents a robust inductive tip clearance sensor capable of monitoring dynamic tip clearances of turbine machines in high-temperature environments and at high rotational speeds. The sensor can also self-sense the temperature at a blade tip in situ such that temperature effect on tip clearance measurement can be estimated and compensated. To evaluate the sensor’s performance, the sensor was tested for measuring the tip clearances of turbine blades under various working temperatures ranging from 700 K to 1300 K and at turbine rotational speeds ranging from 3000 to 10 000 rpm. The blade tip clearance was varied from 50 to 2000 µm. The experiment results proved that the sensor can accurately measure the blade tip clearances with a temporal resolution of 10 µm. The capability of accurately measuring the tip clearances at high temperatures (~1300 K) and high turbine rotation speeds (~30 000 rpm), along with its compact size, makes it promising for online monitoring and active control of blade tip clearances of high-temperature turbomachinery.

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Section: Introductionmentioning

confidence: 99%

Online monitoring of dynamic tip clearance of turbine blades in high temperature environments

Han

Zhong

Zhu

et al. 2018

Meas. Sci. Technol.

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“…Particularly, a rotating shutter and specific data acquisition circuitry is proposed for measuring a broadband temperature range from 900 to 1200 °C [ 15 ]. The authors in [ 16 ] proposed using a modulator as a chopper, next to the hot object, to reduce the effect of measurement drifts due to background radiation on low temperature measurements (<200 °C), but they need an additional fiber, a mechanical chopper, and a CW Nd:YAG laser beam of 1 W to excite the modulator. However, the above solutions suffer from the serious drawback of the strong electromagnetic interference environment, which may interfere with the motor-driving of the mechanical chopper employed, thus affecting the uncertainty and synchronization of the readings, especially if a high accurate and at a moderate speed measurement is targeted.…”

Section: Introductionmentioning

confidence: 99%

Fiber-Optic Pyrometer with Optically Powered Switch for Temperature Measurements

Vázquez

Pérez-Prieto

López-Cardona

et al. 2018

Sensors

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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.

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Background-noise reduction in the infrared fiber optic thermometry

Cited by 2 publications

References 16 publications

Online monitoring of dynamic tip clearance of turbine blades in high temperature environments

Online monitoring of dynamic tip clearance of turbine blades in high temperature environments

Fiber-Optic Pyrometer with Optically Powered Switch for Temperature Measurements

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