Sensitivity-enhanced temperature sensor with cascaded fiber optic Sagnac interferometers based on Vernier-effect

Shao, Liyang; Luo, Yuan; Zhang, Zhiyong; Zou, Xihua; Luo, Bin; Pan, Wei; Yan, Lianshan

doi:10.1016/j.optcom.2014.09.075

Cited by 220 publications

(61 citation statements)

References 13 publications

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“…From Figure 3b, the Lyot-Sagnac interferometer has a much higher temperature sensitivity than that of the conventional one (1.46 nm/°C). The high temperature response is induced by the Vernier effect, which is an efficient method for the improvement of temperature sensitivity and enhancing measurement accuracy [13]; when the temperature changes, the transmission of the single Sagnac loop sensor will shift, and then the shift of Lyot-Sagnac envelope will be magnified by a certain factor. Because of its high temperature sensitivity, this interferometer can meet high temperature sensitivity requirements in various applications, especially in the fields that require high temperature measurement resolution.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…Recently, the applications of fiber Sagnac interferometer-based sensors are the subject of considerable research, such as temperature sensors [5,6], pressure sensors [7,8], strain sensors [9,10], and biochemical sensors [11,12]. Among them, temperature sensors based on Sagnac interferometers with conventional HiBi fiber have been demonstrated and used in high-sensitivity temperature sensing (about 1.46 nm/°C) [13]. Especially, Qian et al proposed an alcohol-filled HiBi-PCF (photonic crystal fiber) Sagnac sensor to improve the sensitivity up to 6.6 nm/°C [14].…”

Section: Introductionmentioning

confidence: 99%

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Optical Fiber Temperature and Torsion Sensor Based on Lyot-Sagnac Interferometer

Shao

Zhang

et al. 2016

Sensors

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An optical fiber temperature and torsion sensor has been proposed by employing the Lyot-Sagnac interferometer, which was composed by inserting two sections of high-birefringence (HiBi) fiber into the Sagnac loop. The two inserted sections of HiBi fiber have different functions; while one section acts as the temperature sensitive region, the other can be used as reference fiber. The temperature and twist sensor based on the proposed interferometer structure have been experimentally demonstrated. The experimental results show that the envelope of the output spectrum will shift with the temperature evolution. The temperature sensitivity is calculated to be −17.99 nm/°C, which is enlarged over 12 times compared to that of the single Sagnac interferometer. Additionally, the fringe visibility of the spectrum will change due to the fiber twist, and the test results reveal that the fringe visibility and twist angle perfectly conform to a Sine relationship over a 360° twist angle. Consequently, simultaneous torsion and temperature measurement could be realized by detecting the envelope shift and fringe visibility of the spectrum.

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Section: Experiments and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical Fiber Temperature and Torsion Sensor Based on Lyot-Sagnac Interferometer

Shao

Zhang

et al. 2016

Sensors

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“…By tracing the frequency response shift of the MPF's passband, the external parameters variations can be monitored. In References , the sensitivity and resolution have been improved effectively by using the Vernier effect; however, to generate the Vernier effect, two interference structures need to be cascaded and the free spectrum range (FSR) between two interference structure is better to be close, which increased the complexity and inflexibility of the fiber ring MPF.…”

Section: Introductionmentioning

confidence: 99%

Temperature sensing scheme based on fiber ring microwave photonic filter with erbium doped fiber amplification

Yang

Xiang

et al. 2019

Micro & Optical Tech Letters

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The temperature sensing scheme based on fiber ring microwave photonic filter (MPF) with erbium doped fiber amplification (EDFA) is proposed and experimentally demonstrated. The fiber ring is used as the time delay element, as well as a sensing element, and by introducing an EDFA to compensate the loss in the fiber ring, the number of the effective sampling taps and thus the suppression ratio are increased. When the EDFA power is set at 0.74 mW, the 3 dB bandwidth of the passband and suppression ratio of the MPF are estimated to be 82.5 kHz, and 15 dB, respectively. The superior sharp passband characteristics make the fiber ring MPF with an EDFA very advantageous for sensing. In our experiment, temperature sensing by using the fiber ring MPF with an EDFA has been carried out for demonstration. The temperature variations induce refractive index changes of the fiber, which will change the time delay of each tap of the fiber ring MPF, and as a result, the FSR of the MPF will be changed. By tracing the peak point shift of the MPF's passband, the temperature variations can be monitored. Our experimental results show that there is a good linear relationship between temperature change and frequency shift, and by measuring passbands with different frequencies, different sensitivity can be obtained. In our experiment, the sensitivity is estimated to be −5.89, −11.74, and − 17.7 kHz/°C, respectively, when the passbands at 0.8, 1.6, and 2.4 GHz are adopted for temperature monitoring.

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“…Recently, several measurement schemes, based on the Vernier effect produced by optical fiber cavities, has been proposed to improve sensitivity by combining paralleled or cascaded interferometers with a small optical path different (OPD). Such as cascaded two Sagnac loops [10], two Fabry-Perot (FP) cavities [11], two offset spliced Mach-Zehnder interferometers (MZIs) [12] and hybrid cascaded configuration constructed by angle shift splicing two segments of polarization maintaining fibers in a single Sagnac loop [13], or combining a FP cavity with a Sagnac loop [14], etc. In the above works, by tracing the envelope of the transmission spectrum, the sensitivity of the Vernier effect-based fiber sensors is effectively improved by several to dozens of times over that using single individual interferometers.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity-enhanced fiber interferometric high temperature sensor based on Vernier effect

Lei

Dong

2019

Photonics and Education in Measurement Science 2019

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Sensitivity-enhanced temperature sensor with cascaded fiber optic Sagnac interferometers based on Vernier-effect

Cited by 220 publications

References 13 publications

Optical Fiber Temperature and Torsion Sensor Based on Lyot-Sagnac Interferometer

Optical Fiber Temperature and Torsion Sensor Based on Lyot-Sagnac Interferometer

Temperature sensing scheme based on fiber ring microwave photonic filter with erbium doped fiber amplification

Sensitivity-enhanced fiber interferometric high temperature sensor based on Vernier effect

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