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Multi-Parameters Detection Implemented by LC Sensors With Branching Inductors
摘要： Inductor-capacitor (LC) sensors utilize magnetic coupling to transfer signals to the readout coil, realizing a passive wireless working pattern. They are of high use in situations where wired connections are impossible to be established. An increasing number of demands, arising from the emerging applications in the Internet of Things and portable devices, require a simultaneous monitoring in sensors. This paper proposes a branching inductor to implement multiple resonances in a single inductor. Each branch of the inductor forms a secondary inductance, which is connected with a sensitive capacitor to work as an LC sensor. The multiple resonances in the branching inductor work in a multi-mode coupling pattern. The coupling, comprising inductive coupling, and capacitive coupling is analyzed and detected. In experiments, a double branching inductor is fabricated on PET substrate. Two sensitive capacitors for humidity and pressure, respectively, are connected to the inductor, resulting in two resonant peaks to monitor the ambient humidity and pressure level. The experimental results are decoupled to obtain final outcomes: the humidity sensor can respond from 15%RH ~ 90%RH with a sensitivity of -45.3 kHz/%RH; and the pressure sensor can work from 750 mmHg ~ 1000 mmHg with a sensitivity of -811.2 kHz/mmHg.
关键词： Branching inductor,LC sensor,multi-parameter
更新于2025-09-23 15:23:52
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Antiresonant Reflecting Guidance and Mach-Zender Interference in Cascaded Hollow-Core Fibers for Multi-Parameter Sensing
摘要： We propose and demonstrate a cascaded hollow-core fiber (HCF) device for multi-parameter sensing based on the combination of antiresonant reflecting guidance (ARRG) and Mach-Zender interference (MZI). The device was fabricated by splicing two sections of HCF together. Two sets of fringes, which have different free spectral ranges, were generated from ARRG and MZI, respectively, and were aliasing in the transmission spectrum. The two sets of fringes were then separated using a band pass filter and a Gaussian fitting technique. The wavelengths at two transmission loss dips formed by ARRG and MZI exhibit a temperature sensitivity of 14.1 and 28.5 pm/°C, and a strain sensitivity of 0.4 and ?0.8 pm/με, respectively. By using a crossing matrix with differences sensitivities, the cross-sensitivity between temperature and strain can be solved. The gas pressure response of the cascaded HCF device was also tested up to 300 °C, and linear relationships between the gas pressure sensitivities and temperature were found, which can be used in gas pressure application in various temperatures. Moreover, the proposed cascaded HCF sensor is compact, low cost, and simple for fabrication, and hence offers a promising way for the simultaneous measurement of multiple parameters, such as temperature, strain, and gas pressure.
关键词： multi-parameter sensing,Mach-Zender interference,antiresonant reflecting guidance
更新于2025-09-23 15:22:29
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Strain-Independent Temperature Measurements with Surface-Glued Polarization-Maintaining Fiber Bragg Grating Sensor Elements
摘要： A novel technique for strain and temperature decoupling with surface-glued fiber Bragg gratings (FBGs) is presented and applied for strain-independent temperature measurements in a temperature range between ?30 °C and 110 °C with uncertainties below 4 °C over the entire measurement range. The influence of temperature-dependent glue-induced transversal forces on the fiber sensor could be eliminated with a sensor element consisting of two FBGs in identical polarization-maintaining fibers that were spliced perpendicular to each other. After aligning and gluing the sensor element with its optical axes parallel and perpendicular to the specimen, the averaged Bragg wavelength shifts of both FBGs were proven to be independent of the glue's influence and therefore independent of any change in the material characteristics of the glue, such as aging or creeping behavior. For the first time, this methodology enables temperature measurements with surface-attached bare FBGs independently of arbitrary longitudinal and glue-induced strains. This is of great value for all applications that rely on a fully glued sensor design, e.g., in applications with high electromagnetic fields, on rotating parts, or in vacuum for space applications.
关键词： surface-attached Fiber Bragg gratings,multi-parameter measurements,glue-induced stress,fiber optic temperature sensing
更新于2025-09-19 17:15:36
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A multistandard and resource-efficient Viterbi decoder for a multimode communication system
摘要： We present a novel standard convolutional symbols generator (SCSG) block for a multi-parameter reconfigurable Viterbi decoder to optimize resource consumption and adaption of multiple parameters. The SCSG block generates all the states and calculates all the possible standard convolutional symbols corresponding to the states using an iterative approach. The architecture of the Viterbi decoder based on the SCSG reduces resource consumption for recalculating the branch metrics and rearranging the correspondence between branch metrics and transition paths. The proposed architecture supports constraint lengths from 3 to 9, code rates of 1/2, 1/3, and 1/4, and fully optional polynomials. The proposed Viterbi decoder has been implemented on the Xilinx XC7VX485T device with a high throughput of about 200 Mbps and a low resource consumption of 162k logic gates.
关键词： Multi-parameter,Reconfigurable Viterbi decoder,Low resource consumption,Standard convolutional symbols generator (SCSG),Fully optional polynomials
更新于2025-09-10 09:29:36