Lianqing Zhu

Optical fiber shape sensing of polyimide skin for a flexible morphing wing

This paper presents the 3D shape sensing of polyimide thin film skin for a flexible morphing wing using fiber Bragg grating (FBG) sensors. The calibration curves of the FBG sensors are measured experimentally to ensure relative accurate conversion between Bragg wavelength shift (BWS) and bending curvature of the polyimide skin. The reflection spectra of the FBG sensors are measured at different airfoil profiles, and the variation tendency of the BWS values with the airfoil profiles are analyzed. The bending curvatures of the polyimide thin film skin at different airfoil profiles are calculated using the measured BWS values of the FBG sensors and the linear interpolation algorithm. The 3D shapes of the polyimide skin at different airfoil profiles are reconstructed based on the measured bending curvatures and the interpolation and curve fitting functions. The 3D precise visual measurements are conducted using a digital photogrammetry system, and then the correctness of the shape reconstruction results are verified. The results prove that the maximum error between the 3D visual and FBG measurements is less than 5%. The FBG sensing method is effective for the shape sensing of polyimide skin for flexible morphing wing.

Representation Method for Spectrally Overlapping Signals in Flow Cytometry Based on Fluorescence Pulse Time-Delay Estimation

Flow cytometry is being applied more extensively because of the outstanding advantages of multicolor fluorescence analysis. However, the intensity measurement is susceptible to the nonlinearity of the detection method. Moreover, in multicolor analysis, it is impossible to discriminate between fluorophores that spectrally overlap; this influences the accuracy of the fluorescence pulse signal representation. Here, we focus on spectral overlap in two-color analysis, and assume that the fluorescence follows the single exponential decay model. We overcome these problems by analyzing the influence of the spectral overlap quantitatively, which enables us to propose a method of fluorescence pulse signal representation based on time-delay estimation (between fluorescence and scattered pulse signals). First, the time delays are estimated using a modified chirp Z-transform (MCZT) algorithm and a fine interpolation of the correlation peak (FICP) algorithm. Second, the influence of hardware is removed via calibration, in order to acquire the original fluorescence lifetimes. Finally, modulated signals containing phase shifts associated with these lifetimes are created artificially, using a digital signal processing method, and reference signals are introduced in order to eliminate the influence of spectral overlap. Time-delay estimation simulation and fluorescence signal representation experiments are conducted on fluorescently labeled cells. With taking the potentially overlap of autofluorescence as part of the observed fluorescence spectrum, rather than distinguishing the individual influence, the results show that the calculated lifetimes with spectral overlap can be rectified from 8.28 and 4.86 ns to 8.51 and 4.63 ns, respectively, using the comprehensive approach presented in this work. These values agree well with the lifetimes (8.48 and 4.67 ns) acquired for cells stained with single-color fluorochrome. Further, these results indicate that the influence of spectral overlap can be eliminated effectively. Moreover, modulation, mixing with reference signals, and low-pass filtering are performed with a digital signal processing method, thereby obviating the need for a high-speed analog device and complex circuit system. Finally, the flexibility of the comprehensive method presented in this work is significantly higher than that of existing methods.

Comparison of Metal-Packaged and Adhesive-Packaged Fiber Bragg Grating Sensors

A feasible metallic packaging technique of fiber Bragg grating (FBG) sensors is developed for measurement of strain, and it can be simply achieved via one-step ultrasonic welding. The strain transfer coefficient of the FBG sensor is theoretically evaluated by a proposed model aiming at determining the proper packaging parameters of a surface-bonded FBG sensor. According to analytical results, the metallic packaging shows higher strain transfer coefficient compared with traditional adhesive packaging under the same conditions. Comparisons of the experimental results with the numerical predictions for the strain sensitivity show a satisfactory agreement. Experimental strain tests are performed on an elaborate uniform strength beam for both tensile and compressive strain, and the strain sensitivity of ~1.26 and 1.34 pm/με is obtained for the tensile and compressive situation, respectively. The results of comparison demonstrate that the metal-packaged FBG sensor has a certain advantage in respect of strain measurement in specific sensing field, such as long-term, high-precision, and harsh-environment structural health monitoring.

Tunable multi-wavelength thulium-doped fiber laser based on Sagnac ring filter

A thulium-doped fiber laser incorporating with Sagnac ring filter is proposed, in order to realize a tunable multi-wavelength laser output. In designed ring cavity fiber laser, one broadband reflection mirror with metal-coated is selected as wavelength reflector, and Sagnac loop is composed of 4 m long polarization maintaining fiber and one 3 dB coupler, and one polarization controller is used to adjust laser wavelengths. In the expriment, the lasing threshold is 150 mW, a tunable and stable single wavelength laser can be realized, and the minimal tunable laser interval is 2 nm; when 1843 nm laser is obtained, the peak power fluctuation is less than 1 dB within 10 min monitor time. By adjusting polarization controller, a tunable dual-wavelength laser can be realized, when 1845 and 1854 nm lasers are achieved simultaneously, the peak power shift is less than 0.8 dB within 10 min scan time at room temperature, and the power difference value of each dual-wavelength laser is less than 3.81 dB. When a tunable triple-wavelength laser is realized through changing polarization state, the power difference value of each lasing is less than 4.1 dB; when four-wavelength and five-wavelength lasing are obtained, the maximum power difference is less than 2.807 and 2.929 dB. In the experiment, the laser 3 dB linewidth is less than 0.4 nm, and side-mode suppression ratio is greater than 32.4 dB. This electronic document is a “live” template and already defines the components of your paper [title, text, heads, etc.] in its style sheet.

Analysis of Flow Cytometric Fluorescence Lifetime with Time-Delay Estimation of Pulse Signals

The measurement of fluorescence lifetimes emerged in flow cytometry because it is not impacted by the non-linearity, which occurs in fluorescence intensity measurements. However, this significantly increases the cost and complexity of a traditional flow cytometer. This work reports a simple method of fluorescence lifetime measurement of a flow cytometer based on the cytometric fluorescence pulse time-delay estimation and hardware time-delay calibration. The modified chirp Z-transform (MCZT) algorithm, combined with the algorithm of fine interpolation of correlation peak (FICP), is applied to improve the temporal resolution of the cross-correlation function of the scattering and fluorescence signals, which in turn improves the time-delay estimation accuracy. The estimation accuracy is verified by Gauss fitting. Cells that were labeled simultaneously with three-color reagents are measured; the statistical results of 5000 cells are compared with reference values and are verified with the pulse width variation. The results show the potential of fluorescence lifetime measurements in the traditional flow cytometer.

A compact arbitrary power division coupler with nonstandard phase-difference

Abstract This paper presents a new coupler configuration which can be designed with both arbitrary power division and nonstandard phase difference at the output ports. The planar coupler ring is composed of four section microstrip lines and an open stub resulting in ease of fabrication. Its circuit parameters can be easily determined by the derived closed-form equations and the corresponding performance in terms of power division ratio, output phase difference, and the tunable parameters is mainly analyzed. Compared with the previous counterparts, its bandwidth and area have obvious superiority. For experimental verification, two prototypes, operating at 1 GHz, have been designed and implemented in microstrip process. One demonstrates a 45° phase difference with equal outputs and the other is designed for a 105° phase difference with 6.02 dB power division ratio. The design theory has been supported with good agreement between the simulated and measured responses.

Non-contact temperature-independent random-displacement sensor using two fiber Bragg gratings

We present a full-range displacement sensor system using two fiber Bragg gratings (FBGs). The magnetic-scale-combined FBGs allow the exploration of random position. The sinusoidal function variations are displayed by two detectors with a phase difference of 90xa0deg, and the optimal magnetic gap is explored through numerical simulations. The feasibility of the method is demonstrated in experiments that show the sinusoidal relation between center wavelength shifts with the linear displacement. Results showed that the amplitudes of the tensile-compressive load were 446.1xa0μϵ and 434.7xa0μϵ, respectively, with linearity of 0.998 and 0.999 at 1.5xa0mm between the detector and the magnetic scale. These results demonstrate that the sensors can realize non-contact, temperature-independent and full-range measurement.

TM Polarized Microcylinder Laser with Engineered Band of Tensile Strained InGaAsP/InP Quantum Well

Tensile-strained InP-based quantum well wafers provide TM mode emission with high optical confinement in the wavelength-sized microcylinder, which introduces feasible way for nanophotonic integration. For the engineering of the band structure, we develop a plane wave expansion method to solve the Luttinger–Kohn Hamiltonian in the InGaAsP quaternary system. After calculation, the quantum well with 0.43% tensile strain is selected for 1510-nm wavelength emission. We fabricated a microcylinder with the radius of <inline-formula> <tex-math notation=LaTeX>

Local Strategy Combined with a Wavelength Selection Method for Multivariate Calibration

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Evaluating the liquid path stability of a flow cytometer

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