In this study, a 2-channel embedded IR fiber-optic temperature se

In this study, a 2-channel embedded IR fiber-optic temperature sensor was fabricated using two identical IR optical fibers for accurate thermometry without complicated calibration processes. Thermometry with the proposed fiber-optic sensor is immune to any changes of physical conditions and emissivity nevertheless of a heat source. In addition, the proposed sensor can be directly embedded in a high temperature/pressure and water-chemistry environment, and can measure inner temperatures in real time. In order to accurately measure temperature, we measured the differences between the amounts of IR radiation emitted from two temperature sensing probes according to the temperature variation.2.?Materials and Experimental SetupIn fiber-optic thermometer applications, a chalcogenide optical fiber and a silver halide optical fiber are generally used as a representative IR waveguide [16,17].
A chalcogenide optical fiber, which can transmit light in the 1 to 6 ��m range, Inhibitors,Modulators,Libraries has lower attenuation losses. In addition, a chalcogenide IR fiber based on binary glass arsenic trisulfide (As2S3) is non-hygroscopic and it shows excellent transmittance from 1.5 up to 6 ��m, but on the other hand chalcogenide optical fibers are toxic and fragile, and their melting point is lower than 245 ��C, therefore, a chalcogenide optical fiber is barely suitable for thermometry in high temperature/pressure and water-chemistry environments. In the case of a silver halide optical fiber based on silver bromide chloride (AgBrCl) polycrystalline material, temperature measurement is possible over a large temperature range because it is available for the transmission of mid-IR from 3 to 16 ��m and its melting point is about 412 ��C.
Inhibitors,Modulators,Libraries Additionally, it has been reported that silver halide optical fiber is flexible, water-insoluble, and non-toxic [6].As IR optical fiber, a silver halide optical fiber (JT Ingram, PIR 900/1000) was selected for this study. The outer diameter of this optical fiber is 1.0 mm, and the cladding thickness is 0.05 mm. The refractive Inhibitors,Modulators,Libraries indices of the core and the cladding are 2.15 and 2.13, respectively, and the numerical aperture (NA) is 0.25. This polycrystalline IR optical fiber is produced with pure AgCl:AgBr solid solution crystals in a core/clad structure, and the jacket is made of polyether ether ketone (PEEK).
The silver halide optical fiber is transparent over a wide spectral range ranging from 4 to 18 ��m, as shown in Figure 2, and the attenuation is less than 500 dB/km in a wavelength range from 9 to 14 ��m [4]. This fiber is very flexible Inhibitors,Modulators,Libraries and durable over a temperature range from ?200 to 250 ��C, and its melting point is 415 ��C.Figure 2.Transmission Brefeldin_A rates of a silver halide optical fiber.Figure 3 illustrates the structure of the temperature sensing probe, which is composed of a cap selleck screening library (1), a tube (2), a silver halide optical fiber (3), and an IR emitting material (4).

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