Supercritical carbon dioxide detection optical fiber sensor and supercritical carbon dioxide detection device

Abstract

[Problem] To provide a supercritical carbon dioxide detection optical fiber sensor and supercritical carbon dioxide detection device that have high durability even under ultra-high pressure environments by utilizing absorption spectroscopy. [Solution] The optical fiber 12 has an optical fiber 12 having a core 16 and a cladding 18 covering the core 16. The optical fiber 12 has a core 16 made of fluoride glass and is capable of transmitting infrared light in the mid-infrared region. The optical fiber sensors 10 and 20 have a detection unit 14 in the middle of the optical path of the core 16. The detection unit 14 is positioned such that the cladding 18 where the detection unit 14 is located is formed thinner than other parts, or the core 16 is exposed, and it can be installed in supercritical carbon dioxide. When light passes through the core 16 of the detection unit 14, a portion of the light passing through the core 16 leaks out of the core 16, and light with a spectrum specific to supercritical carbon dioxide in contact with the detection unit 14 is absorbed. The device includes a light source 32 and a spectral analyzer 34 capable of detecting the spectrum of light transmitted through the optical fiber 12. [Selected Figure] Figure 3