Guillen Bonilla José Trinidad, Guillen Bonilla Alex, Rodríguez Betancourtt Verónica M, Guillen Bonilla Héctor, Casillas Zamora Antonio
Computing and Electronic Departments, Centro Universitario de Ciencias Exactas e Ingenierías (CUCEI), University of Guadalajara, Blvd. M. García Barragán 1421, 44410 Guadalajara, Jalisco, Mexico.
Mathematic Department, Centro Universitario de Ciencias Exactas e Ingenierías (CUCEI), University of Guadalajara, Blvd. M. García Barragán 1421, 44410 Guadalajara, Jalisco, Mexico.
Sensors (Basel). 2017 Apr 14;17(4):859. doi: 10.3390/s17040859.
The application of the sensor optical fibers in the areas of scientific instrumentation and industrial instrumentation is very attractive due to its numerous advantages. In the industry of civil engineering for example, quasi-distributed sensors made with optical fiber are used for reliable strain and temperature measurements. Here, a quasi-distributed sensor in the frequency domain is discussed. The sensor consists of a series of low-finesse Fabry-Perot interferometers where each Fabry-Perot interferometer acts as a local sensor. Fabry-Perot interferometers are formed by pairs of identical low reflective Bragg gratings imprinted in a single mode fiber. All interferometer sensors have different cavity length, provoking frequency-domain multiplexing. The optical signal represents the superposition of all interference patterns which can be decomposed using the Fourier transform. The frequency spectrum was analyzed and sensor's properties were defined. Following that, a quasi-distributed sensor was numerically simulated. Our sensor simulation considers sensor properties, signal processing, noise system, and instrumentation. The numerical results show the behavior of resolution vs. signal-to-noise ratio. From our results, the Fabry-Perot sensor has high resolution and low resolution. Both resolutions are conceivable because the Fourier Domain Phase Analysis (FDPA) algorithm elaborates two evaluations of Bragg wavelength shift.
由于具有众多优点，传感光纤在科学仪器和工业仪器领域的应用极具吸引力。例如，在土木工程行业中，由光纤制成的准分布式传感器用于可靠的应变和温度测量。在此，讨论一种频域中的准分布式传感器。该传感器由一系列低精细度法布里 - 珀罗干涉仪组成，其中每个法布里 - 珀罗干涉仪充当一个局部传感器。法布里 - 珀罗干涉仪由刻写在单模光纤中的成对相同低反射率布拉格光栅形成。所有干涉仪传感器具有不同的腔长，从而引发频域复用。光信号代表所有干涉图样的叠加，可通过傅里叶变换进行分解。对频谱进行了分析并定义了传感器的特性。随后，对一种准分布式传感器进行了数值模拟。我们的传感器模拟考虑了传感器特性、信号处理、噪声系统和仪器仪表。数值结果显示了分辨率与信噪比的关系。从我们的结果来看，法布里 - 珀罗传感器具有高分辨率和低分辨率。两种分辨率都是可以想象的，因为傅里叶域相位分析（FDPA）算法对应变布拉格波长偏移进行了两种评估。
