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Highly sensitive gas-pressure sensor based on paralleled optical fiber Fabry-Perot interferometers
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摘要:
本文提出并制备了一个基于游标效应的高灵敏度光纤气压传感器。该传感器包含两个并联的法布里-珀罗干涉仪(FPI)，它们均由单模光纤和一小截毛细管熔接构成，分别作为传感腔和参考腔，且其中传感腔的侧面刻蚀微通道，以便于待测气体进入。俩干涉仪间较小的光程差导致传感器产生具有游标效应的叠加反射光谱，气压灵敏度得到极大的提高，达到~64 pm/kPa，该值是单一FPI的~16倍。另外，实验结果显示，该传感器对温度不敏感，从而减少了环境温度对气压测量结果的影响。结构结实、气压灵敏度高等优点，预示着该传感器在工业生产、气体检测等领域具有广阔的应用前景。
Abstract:A highly sensitive optical fiber sensor based on the Vernier effect is demonstrated for gas pressure sensing. It consists of two paralleled Fabry-Perot interferometers (FPIs), which are both produced by splicing a single-mode fiber to a short segment of capillary tube, acting as sensing cavity and reference cavity, respectively. The lateral wall of the sensing FPI is drilled with a micro-channel allowing gas to flow in. Due to the small optical path difference between the two FPI, the Vernier effect is caused in the reflected spectrum of the sensor. Thus, the gas-pressure sensitivity is significantly enhanced, achieving up to ~64 pm/kPa which is ~16 times higher than that of a single FPI. Additionally, experimental results show that the sensor is insensitive to the surrounding temperature, which reduces the influence of ambient temperature on the measurement of gas pressure. The advantages of robust structure and high sensitivity of gas pressure indicate that the demonstrated sensor has a promising potential in industrial production, gas detection, and other fields.
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Key words:
- optical fiber sensor /
- Fabry–Perot interferometer /
- vernier effect /
- gas pressure
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Overview: Precise measurement of the gas pressure is important in a variety of fields, including environmental monitoring, energy management, and vehicle manufacturing. The measuring range is severely limited due to the electronic gas pressure sensor's susceptibility to temperature and electromagnetic interference. Optical fiber pressure sensors have demonstrated significant potential in practical applications due to their unique qualities of compact size, anti-electromagnetic interference, corrosion resistance, and robust resistance, attracting a lot of interest from researchers. Various fiber sensors based on fiber Bragg gratings (FBGs), long-period gratings (LPGs), and interferometers for gas pressure sensing have been presented in recent years. They all have distinct sensing benefits, among those, high sensitivity has always been one of the goals that researchers pursue.
Vernier effect is known for the first time because it was applied to Vernier calipers, consists of two independent scales with slightly different periods so that the overlap of both achieves the high measurement accuracy. Similarly, this effect can also be employed in the field of optical fiber sensing. Normally two interferometers with slightly different free spectral ranges are arranged in series (or cascaded structures), one as a sensor while the other as a stable reference. By tracking the response of the spectral envelope of the two interferometers, the sensitivity can be amplified by several orders of magnitude, realizing high-precision measurements. This sensitivity amplification mechanism has been successfully applied in temperature, pressure, refractive index, and curvature.
In this paper, a highly sensitive optical fiber sensor based on the Vernier effect is demonstrated for gas pressure sensing. It consists of two paralleled Fabry-Perot interferometers (FPIs), which are both produced by splicing a single-mode fiber to a short segment of capillary tube, acting as sensing cavity and reference cavity, respectively. The lateral wall of the sensing FPI is drilled with a micro-channel allowing gas to flow in. Due to the small optical path difference between the two FPI, the Vernier effect is caused in the reflected spectrum of the sensor. Thus, the gas-pressure sensitivity is significantly enhanced, achieving up to ~64 pm/kPa which is ~16 times higher than that of a single FPI. Additionally, experimental results show that the sensor is insensitive to the surrounding temperature, which reduces the influence of ambient temperature on the measurement of gas pressure. The advantages of robust structure and high sensitivity of gas pressure indicate that the demonstrated sensor has a promising potential in industrial production, gas detection, and other fields.
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图 1 并联FPI光纤气压传感器(a)结构示意图和(b)显微镜照片
Figure 1. (a) Schematic diagram and (b) micrograph of the proposed gas pressure sensor based on paralleled FPIs
图 2 (a) 模拟计算得到的参考FPI和传感FPI的反射光谱；(b) 单一传感FPI在不同气压下的反射光谱
Figure 2. (a) Simulated reflection spectra of the sensing and reference FPIs, respectively; (b) The reflection spectra of the single sensing FPI at different gas pressures
图 3 模拟计算气压变化200 kPa的并联FPI气压响应特性
Figure 3. Calculated reflection spectra of the paralleled FPIs for gas pressure variation of 200 kPa
图 5 (a) 传感FPI和参考FPI的反射光谱；(b) 并联FPI的反射光谱
Figure 5. (a) Measured reflection spectrum of the sensing and reference FPIs, respectively; (b) The reflection spectrum of the device with paralleled FPIs
图 7 并联FPI的气压响应特性。
Figure 7. Response of the proposed device with paralleled FPIs to gas pressure.
图 8 (a) 不同气压下的并联FPI的反射光谱的包络；(b) 包络中心波长漂移与气压之间的关系
Figure 8. (a) Envelopes of the reflection spectra of the device with paralleled FPIs at different gas pressures; (b) The relationship between resonances dip wavelength of the envelope and gas pressure
图 9 并联FPI的温度响应特性。
Figure 9. Temperature response of the proposed device with paralleled FPIs.
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