A phase unwrapping algorithm for interferometric fringes based on the unscented Kalman filter (UKF) technique is proposed. The can bring about accurate and good noise suppression simultaneously by incorporating true its derivative in state vector estimation through UKF process. Simulations indicate that proposed has better accuracy than some widely employed approaches same condition. Also, time consumption of reasonably acceptable. Applications our different optical interferometer systems...

Network slicing (NS) is recognized as a key technology for the 5G mobile network in enabling to support multiple diversified vertical markets over shared physical infrastructure with efficiency and flexibility. A NS instance composed of set virtual function (VNF) instances form end-to-end (E2E) slice operate independently. The deployment typical embedding (VNE) problem. We consider scenario which VNF can be across slices further enhance utilization ratio underlying resources. For NSs...

A series of novel pH‐sensitive gene delivery vectors (POEI 1, 2, and 3) are synthesized through Michael addition from low molecular weight PEI (LMW PEI) via acid‐labile ortho ester linkage with terminal acrylates (OEAc) by various feed molar ratios. The obtained POEI 1 2 can efficiently condense plasmid DNA into nanoparticles size range 200–300 nm zeta‐potentials about +15 mV while protecting enzymatic digestion compared 3. Significantly, groups main‐chains make an instantaneous...

A non-null annular subaperture stitching interferometry (NASSI), combining the ideal and test method, is proposed for steep aspheric testing. Compared with standard (ASSI), a partial null lens (PNL) employed as an alternative to transmission sphere, generate different aspherical wavefronts references. The coverage number would be reduced greatly better performance of in matching local slope surfaces. In this way, relatively large overlapping areas can obtained adjustment errors correction...

Aspheric non-null testing, as an alternative to the traditional null achieves more flexible measurements. However, figure-error reconstruction in tests has always been difficult due presence of retrace error. A novel method with reverse optimization is proposed for aspheric a interferometer. It generalized and effective approach based on system modeling polynomial fitting. An function set coefficients desired figure error variables those detected experimental wavefront targets. Through...

In addition to the concept of picometer resolution, we discuss macro displacement measurement with a vortex beam interferometer. Three factors limiting large are resolved. Small topological charge numbers promise both high sensitivity and measurements. With computing visual method, virtual moiré pointer image immune misalignment is proposed calculate displacements. Interestingly, absolute benchmark found for cycle counting in fractional charge. The interferometer would not stop at tiny...

Instead of various mathematical stitching algorithms, an aspheric subaperture interferometric method relying on modern computer modeling technique is presented. Based our previously reported non-null annular interferometry (NASSI), a simultaneous reverse optimizing reconstruction (SROR) based system proposed for full aperture figure error reconstruction. All the measurements are simulated simultaneously with multi-configuration model in ray tracing program. With model, would be extracted...

A pure adaptive interferometer is proposed for optical free form surfaces metrology without auxiliary devices such as the wavefont sensors and deflectometry systems DM monitoring. In this method, surface monitoring measurement are achieved simultaneously in only one interferometer. The polarizing optics divide into two partial common path interferometric system, which provide null test tested non-null surface. final figure error of extracted by ray tracing. Experiments proving feasibility shown.

Calibration for misalignment aberrations is one of the challenges in non-null interferometric aspheric testing. The high-order are especially difficult to distinguish from rest testing system. traditional calibration method removing first four terms Zernike coefficients test wavefront obviously inaccurate. Computer-aided alignment considered be an effective method; however, it less practical due its dependency on mechanical or manual adjustment, as other common methods. A and accurate based...

Traditional spherical radius of curvature interferometry is not valid for an aspheric vertex (VROC) due to the obstacle in identifying null positions (cat's eye or confocal position). Simultaneous optimization multiconfiguration interferometer model proposed retrieve actual VROC from its biased nominal value. This procedure works out contradiction between deviation and positioning error even surface figure error, independent absolute by cat's position. In this method, can be measured...

Fringe projection profilometry has been proverbially utilized for measuring the shapes of objects. A common challenge in those systems is to accurately obtain a smooth absolute phase. Many new methods have proposed address this challenge. In paper, we discuss technique based on variant shifting phases. This approach embeds codewords into phase and only needs four patterns. However, reliable measurement results are difficult achieve with large number because errors. To shortcoming, present...

The newest experimental validation report of the coverage for rotationally non-symmetric departure a freeform surface in adaptive interferometry is about 20 µm. A compact interferometer introduced to test unknown surfaces with larger departure. cascaded DMs (woofer and tweeter) can effectively double measurable departure, ∼80 µm using current DM technology. With constrained decoupling control algorithm, woofer tweeter averagely share aberrations without coupling. monitoring addressed by...

In interferometric testing for optical freeform surfaces, the calibration of surface misalignment aberrations is a tremendous challenge. A complex figure with six-axis degree freedom introduces non-linear misaligned aberration variations slight misalignments. The traditional sensitive matrix method provides considerable precision in only linear area, which unacceptable. this paper, deep neural network (DNN)-based introduced. well-trained DNN can treat relation and, thus, yield accurate...

Irregular subaperture stitching interferometry (ISSI) is proposed for non-null optical freeform surface testing. Compared with circular and annular subapertures, irregular subapertures have a better performance in matching the locally resolvable interferograms due to rotational asymmetry of surfaces. A modified multi-aperture simultaneous reverse optimization reconstruction algorithm employed stitching, allowing not only non-complementary but also no overlaps. Numerical simulations error...

In the existing deformable mirror (DM)-based adaptive interferometers for freeform surfaces test, departure coverage and DM surface monitoring load are contradictory to each other. We reported an ring-cavity compensator (ARCC) based interferometer. With multiple cyclic reflections of beam in ARRC, is enlarged four times stroke one DM. only DM, ARCC achieves comparable dual-DMs, without any incremental decoupling operation. The interferometer thus doubled at a relatively low cost. measurement...

In the paper, we research on application of TTEthernet in launch vehicle control system. Firstly, communication network requirements next generation is proposed this paper. Then, introduce view mechanism communication, clock synchronization and fault-tolerant performance. And further, analyze advantages TTEthernet. Lastly, design a dual redundant topology for based TTEthernet, studying dataflow during process launching. The results can not only show exploration vehicle, but also provide...

Central catadioptric camera is a class of omnidirectional sensor having single effective viewpoint with reflective surfaces and lenses. This work studies the geometry central projection set lines adopts it into calibration. In this paper, we propose practical calibration method for cameras by manually labeling corners on planar grids. analytically parameterizes intersection lines, regardless whether they are parallel or not. Algebraic distance introduced in order to robustify since conic...

Most tested surface calibration methods in interferometers, such as the direct coefficients removing method, sensitive matrix (SM) and deep neural network (DNN) rely on Zernike coefficients. However, due to inherent rotationally non-symmetric aberrations a non-null freeform interferometer, interferograms are usually non-circular even if apertures circular. The based inaccurate non-orthogonality of polynomials area. A convolutional (CNN)-based misalignment method is proposed. Instead...

This paper mainly studies the security of data link layer in wireless sensor network (WSN), and proposes AES-128 encryption scheme based on time synchronization for data. In this scheme, algorithm is combined with stamp process key expansion to encrypt layer. At same dynamic updating key, extraction timestamp are released. When sending broadcast packets, used generate time-related realize update key. Simulation results show that, compared other traditional algorithms, more suitable solving...

A free-form surface sub-aperture stitching interferometry (FSSI) is proposed for aspheric and surfaces testing. Different from normal annular circular method, non-null interferometric configuration irregular sub-apertures are employed to make the best use of resolved fringes. Meanwhile, a multi-aperture simultaneous reverse optimizing reconstruction (MSROR) process full aperture figure error reconstruction. With multi-configuration model, would be extracted in form Zernike polynomials...