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A design of mine wind velocity sensor is reported, which is based on differential pressure principle and adopts differential sensitive architecture composed of a bellows, an equal-strength beam and two fiber Bragg gratings(FBG). Furthermore, an algorithm is introduced for temperature compensation. Through these methods the cross sensitivity of temperature is effectively eliminated. The relation between...
We developed a new technique for constructing humidity sensor comprised of two cascaded peanut-shape structure which were coated with polyvinyl alcohol (PVA) and in between was also coated with PVA. The coating changes with the humidity which resulting in the change of the effective refractive index, and lead to the change of the interference wavelength. Experiments show that, with the humidity changes...
This letter puts forward weak FBGs Fabry-Perot (FP) structures with copper coating for quasi-distributed temperature measurement. The weak FBGs (−33dB) are fabricated by on-line draw tower. The sensors system exhibits the superiorities of high signal to noise ratio (SNR). At the same time, wavelength/frequency/time multiplexing immensely increases the capacity of the sensing system. In the experiment,...
The effect of gamma radiation with a maximum dose of 180 kGy at a dose rate of 10.15 kGy/hour on both standard Ge-doped fiber Bragg Gratings (Ge-FBG) and femtosecond-laser-inscribed pure-silica-core fiber Bragg Gratings (FL-PS-FBG) have been investigated. In the case of Ge-FBGs, a maximum Bragg wavelength shifts (BWS) of 140 pm and a decrease of the reflection peak power of 16 dB has been observed...
This paper presents a temperature measurement system based on fluorescence intensity ratio of erbium-doped fiber. A novel compact system architecture consisted of 980nm pumping laser, 980/1550nm wavelength division multiplexer (WDM), one way Erbium doped fiber was developed. The system performance was verified by the relationship between temperature and the fluorescence intensity ratio(FIR)of 1450nm...
A temperature sensor with two cascaded fiber Fabry-Perot interferometers (FPIs) is constructed and demonstrated, which works on envelope-based demodulation and exhibits a high temperature sensitivity. The sensor is fabricated by splicing a short segment of large mode area (LMA) fiber to a short segment of capillary tube fused with a section of single-mode fiber to form a cascaded FPI structure. Experimental...
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