To facilitate a safety monitoring system for temperature variation of cryogenic medium, including liquefied natural gas (LNG) and liquid nitrogen (N2), etc., a fibre optic based cryogenic safety monitoring system was developed. The invention consists of fibre optic based cryogenic sensors, a full functional fibre optic data logger, as well as a software package for data analysis, data virtualization and remote transmission.
The main purpose of this technology is to increase the accuracy of fibre optic based sensors for the temperature measurement in the cryogenic environment. When being utilised in low temperature environment (-165 degC), the sensitivity of conventional fibre optic sensors may be dramatically reduced, which makes the temperature measurement uncertainty more than ±2 degC. Conversely, the technology utilises PI-coated fibre optic components and special designed substrates to increase the sensitivity of fibre optic sensors in the cryogenic environment. Consequently, the temperature accuracy of fibre optic sensors can reach ±0.5 degC.
Unlike the electrical based sensors which suffer from potential safety issues, the fibre optic based crygenic monitoring system is intrinsically safe, immune to electromagnetic interference, explosion proof and corrosion resistant. Therefore, the technology can be used to measure and monitor the temperature of cryogenic medium as an alternative of electrical based sensors.
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