46 results about "Elliptical polarization" patented technology

The invention provides an adjustable power distribution circuit capable of realizing any polarization mode, the adjustable power distribution circuit is positioned between a radio frequency circuit and at least one antenna assembly, the adjustable power distribution circuit comprises an input signal part, at least two signal control parts, a processing unit and at least one orthogonal coupling circuit, the input signal part can convert a radio frequency signal from the radio frequency circuit into a plurality of corresponding input signals and transmit the input signals to each signal control part, each signal control part can convert the input signals into corresponding control signals according to a processing instruction of the processing unit and then transmit the control signals to the orthogonal coupling circuit, and the orthogonal coupling circuit transmits the control signals to the radio frequency circuit. And the orthogonal coupling circuit generates two output signals with a phase difference of 90 degrees, and transmits the output signals to the antenna assembly. Therefore, the adjustable power distribution circuit can enable the antenna assembly to form a linear polarization mode, a circular polarization mode or an elliptical polarization mode in any direction according to actual requirements of products.

The invention discloses an arbitrary elliptical polarization programmable array antenna construction method. A single multi-polarization reconfigurable antenna can only realize a plurality of discrete polarization states and cannot realize receiving or transmitting of any elliptical polarization electromagnetic wave. According to the method, expected elliptical polarization is decomposed into superposition of vectors in the long axis direction and the short axis direction of an ellipse, four alternative polarization states are selected according to projection values of a multi-linear polarization reconfigurable unit in the two directions, then the number of the four alternative polarization states is calculated, and the polarization states of array units are randomly distributed according to the calculated number. And finally, receiving or transmitting any elliptical polarization electromagnetic wave according to the wave beam direction and the expected elliptical polarization configuration unit excitation phase. Polarization resources of electromagnetic waves can be fully utilized, and the method plays a significant role in expanding the capacity of a wireless electromagnetic system, improving the receiving and transmitting efficiency of the system, resisting external interference and the like.

The invention relates to the field of cable detection, and discloses a cable oil film uniformity detection system based on machine vision, and the system comprises an active photoelectric illumination module which is used for generating a modulation optical signal of which the polarization state changes under a preset time sequence, and projecting the modulation optical signal to the surface of a cable; the synchronous photoelectric sensing and conversion module is used for receiving the modulated optical signal reflected by the surface of the cable and synchronously converting the modulated optical signal into a first electrical signal flow and a second electrical signal flow; wherein the first electrical signal flow represents multi-spectral intensity information of the reflected modulated optical signal, and the second electrical signal flow represents multi-polarization intensity information of the reflected modulated optical signal. By utilizing the sensitivity difference of the thin film interference model and the elliptical polarization model to the optical parameter change of the oil product, the systematic measurement error caused by batch replacement of the oil product or temperature fluctuation can be actively corrected, and the accuracy and long-term stability of the detection result are improved.

The invention discloses a polarization-adjustable antiferromagnetic terahertz source based on a MnPt heterojunction. The polarization-adjustable antiferromagnetic terahertz source comprises a MnPt antiferromagnetic thin film layer, a light metal layer and an anti-oxidation layer, according to the invention, the femtosecond laser is used for exciting the femtosecond laser to generate the terahertz wave, the polarization direction of the generated terahertz wave is changed along with the change of the polarization direction of the femtosecond laser, that is, the polarization direction of the laser is changed by 1 degree, the polarization direction of the terahertz is changed by 2 degrees, the change of the azimuth angle of a sample is not needed, and the width of the generated terahertz spectrum exceeds 5 THz. No extra heavy metal layer needs to be added, the size is miniature, and the thickness is smaller than 40 nm. By adjusting polarization and phase difference of femtosecond laser, adjustability of a linear polarization state, an elliptical polarization state or a circular polarization state can be achieved, the structure is simple, a needed light path is simple, assistance of an external magnetic field or current is not needed, micromachining is not needed, the ultra-high external magnetic field interference resistance is achieved, the cost is reduced, and the application range is wide. And integration of the terahertz source is also facilitated.

The present invention provides a distance calculation device that can calculate distance information relating to the distance a workpiece travels. [Solution] The system comprises a light source 10 that emits light, a first optical system 20 that converts the light from the light source into elliptical polarization and emits it toward a workpiece W1 that is transparent and moving in a specific direction, a second optical system 30 that converts the light from the workpiece into linear polarization and emits it, and an optical sensor 40 that acquires optical information of the workpiece based on the light from the second optical system. The first optical system includes a first polarizing filter 22 that converts to linear polarization and a first waveplate 23 that converts the linear polarization from the first polarizing filter into elliptical polarization. The second optical system 30 includes a second waveplate 31 that converts the light from the workpiece and a second polarizing filter 32 that is placed between the second waveplate and the optical sensor 40 and converts the light from the second waveplate into linear polarization.

The utility model provides an antenna assembly and electronic equipment, and belongs to the technical field of antennas. The antenna assembly comprises a first radiator, a second radiator and a phase shift unit. The first radiator and the second radiator are arranged at intervals, and the polarization directions of the first radiator and the second radiator are perpendicular to each other; the phase shift unit is connected with the first radiator and the second radiator and is used for realizing a 90-degree phase difference between the first radiator and the second radiator. According to the antenna assembly provided by the utility model, the first radiator and the second radiator are arranged at intervals and are connected through the phase shift unit, the polarization directions of the two radiators are perpendicular to each other, and the phase shift unit is used for realizing a 90-degree phase difference between the first radiator and the second radiator. The first radiator and the second radiator can realize circular polarization or elliptical polarization radiation, so that the circular polarization performance of the antenna assembly can be improved, the satellite communication performance is improved, and application and popularization of a satellite communication technology in electronic equipment are facilitated.

To provide an optical laminate including a liquid crystal alignment cured layer and suppressing peeling defects when peeling the alignment substrate. 【Solution means】The optical laminate according to an embodiment of the present invention has a polarizing plate including a polarizer, a retardation layer laminated on the polarizing plate via a first adhesive layer, and a substrate laminated on the retardation layer in a peelable manner; the retardation layer includes, in order from the polarizing plate side, a first liquid crystal alignment cured layer and a second liquid crystal alignment cured layer laminated on the first liquid crystal alignment cured layer via a second adhesive layer; the retardation layer as a whole has a circular polarization function or an elliptical polarization function, has a relationship of Re(450)<Re(550)<Re(650), and its Nz coefficient is 0.30 to 0.70; the substrate is an alignment substrate of the second liquid crystal alignment cured layer, and its tensile elastic modulus is 3000 N / mm 2 or more.

The present invention relates to a high-precision reflective film thickness measurement method and system, which relates to the field of thin film measurement technology. The method comprises: controlling a preset light source module to emit a measuring light beam to a thin film material whose film thickness needs to be measured; collecting reflected light detection information after the measuring light beam is irradiated on the thin film material and reflected; generating position adjustment information in real time based on the reflected light detection information, and outputting the position adjustment information to a preset position adjustment module to control a preset reflected light detection module or a preset light source module to adjust the position, and re-collecting the reflected light detection information and defining it as reflected light update information; selecting based on the reflected light update information to generate reflected light selection information; performing elliptical polarization analysis based on the reflected light selection information to form a film thickness result value, and outputting the film thickness result value. The present invention facilitates high-precision measurement of film thickness.

Embodiments of the present application relate to a three-dimensional spatial light source system and a corresponding light measurement device, wherein the three-dimensional spatial light source system comprises: a light source; and a plurality of light paths independent of each other and configured to be coupled to the light source independently; wherein the plurality of light paths further comprises an intermediate light path and a plurality of peripheral light paths arranged around the intermediate light path and capable of being output as secondary light sources. Thus, the three-dimensional spatial light source system of the present application only needs one light source to meet the multi-path light source requirement of an elliptical polarization measurement device, and has simple structure, convenient installation and maintenance.

The utility model provides a focal plane full polarization sensing device, including substrate, phase delay layer, polarization detection layer and CCD sensor, the phase delay layer and polarization detection layer are arranged on one side of substrate in proper order, the phase delay layer has a plurality of phase delay zone in array arrangement, and the CCD sensor is arranged in the phase delay zone. The phase delay area comprises 2x < 2 > pixel units in different fast axis directions, the polarization detection layer is in single horizontal orientation, and the phase delay layer and the polarization detection layer are combined to form an elliptical polarization array, so that the simultaneous detection of four elliptical polarized lights is realized. The manufacturing process of the focal plane splitting polarization sensing device based on the metal wire grating is simplified, the manufacturing cost is reduced, efficient polarization imaging of the infrared band can be achieved, and the multi-band compatibility of the device is improved.

The present invention relates to the field of damage detection technology, and discloses a damage detection method and system for a screen protective film. The method comprises: performing laser interference thickness scanning on the screen protective film to obtain three-dimensional thickness distribution data and thickness gradient vector field data; performing multi-layer polarization interference detection on a circularly polarized light beam based on the three-dimensional thickness distribution data to obtain polarization phase difference distribution data; performing non-periodic phase de-envelopment processing on the polarization phase difference distribution data according to the thickness gradient vector field data to obtain continuous polarization phase distribution data; performing stress optical coefficient tensor calculation and dynamic elliptical polarization modulation based on the continuous polarization phase distribution data to obtain stress damage spatial positioning data; and performing damage imaging reconstruction on the edge cutting area and the central bending area of ​​the screen protective film to obtain three-dimensional stress damage imaging results. The present invention realizes full-chain detection from geometric thickness change to stress distribution to damage positioning.

A single-light-path atom magnetometer based on any polarization state light splitting metasurface cascade is characterized in that coherent light emitted by a laser passes through a first-stage metasurface to realize light beam splitting in an orthogonal elliptical polarization state, one beam of light in the beam splitting light enters a glass gas chamber for pumping and detection, and the other beam of light enters a photoelectric detector for pumping and detection; the second-stage metasurface is used for monitoring the output light power of the laser device and controlling stable output of the laser device through a control circuit, light emitted out of the glass gas chamber passes through the second-stage metasurface, beam splitting of orthogonal linear polarization components is achieved, the light enters the two photoelectric detectors respectively, and precise measurement of an external magnetic field is achieved through signal processing of a rear-end circuit. The atomic magnetometer has the advantages that complete precise control over pumping and detection in the atomic magnetometer is achieved through cascading of the light splitting metasurfaces which can be integrated and are in any polarization state, meanwhile, system configuration is simplified, and performance improvement and miniaturization are facilitated.

The invention relates to a high-precision reflective film thickness measurement method and system, and relates to the technical field of film measurement, and the method comprises the steps: controlling a preset light source module to emit a measurement light beam to a film material needing film thickness measurement; collecting reflected light detection information after the measurement light beam irradiates the thin film material and is reflected; based on the reflected light detection information, position adjustment information is generated in real time, the position adjustment information is output to a preset position adjustment module to control a preset reflected light detection module or a preset light source module to carry out position adjustment, and the reflected light detection information is collected again and defined as reflected light updating information; selecting based on the reflected light updating information to generate reflected light selection information; and performing elliptical polarization analysis based on the reflected light selection information to form a film thickness result value, and outputting the film thickness result value. The film thickness measuring device has the advantage that the film thickness can be conveniently measured in a high-precision mode.

The invention discloses an electromagnetic ultrasonic surface wave multi-parameter synchronous detection sensor and a detection method, and the sensor comprises an electromagnetic ultrasonic surface wave excitation unit which is composed of a magnet group and a fold-back line type excitation ring. The two-dimensional component electromagnetic ultrasonic surface wave receiving unit consists of a magnet group, a vertical rectangular receiving coil and a horizontal runway type coil; the detection method comprises the following steps: the electromagnetic ultrasonic surface wave excitation unit excites an ultrasonic surface wave on the near surface of a detected object, and the ultrasonic surface wave generates an elliptically polarized wave with two-dimensional components of out-of-plane displacement and in-plane displacement and transmits the elliptically polarized wave forwards; a horizontal magnetic field and a vertical magnetic field are respectively cut below the two-dimensional component electromagnetic ultrasonic surface wave receiving unit and are respectively received by two coils of the receiving unit to form receiving signals of an out-of-plane component and an in-plane component; and the polarization coefficient, the wave velocity and the surface wave coefficient of the surface wave can be respectively obtained according to the two component signals and the distance between the excitation unit and the receiving unit, so that multi-parameter synchronous detection is realized.

The invention discloses a weak value amplification-based polarization-maintaining photonic crystal resonance angular velocity sensor and method, and relates to the technical field of optical fiber sensing, and the weak value amplification-based polarization-maintaining photonic crystal resonance angular velocity sensor comprises a light source module, a polarization control module, a polarization-maintaining photonic crystal fiber annular resonant cavity and an interference reading module. The light source module, the polarization control module, the polarization-maintaining photonic crystal fiber annular resonant cavity and the interference reading module are connected through optical fibers. The light source module is used for providing laser with stable polarization and narrow linewidth; the polarization control module is used for switching linear polarization, circular polarization and elliptical polarization and preparing a front selection state and a rear selection state for weak value amplification; the polarization-maintaining photonic crystal fiber annular resonant cavity is used for forming an angular velocity measurement optical signal; the interference reading module is used for obtaining interference fringes. By implementing the weak value amplification-based polarization-maintaining photonic crystal resonance angular velocity sensor and method provided by the invention, the measurement sensitivity and stability of weak angular velocity can be improved.

The present application provides an antenna assembly, comprising a first radiating branch, a second radiating branch and a feeding excitation branch. The first and second radiating branches are arranged at an angle. The feeding excitation branch is located between the first and second radiating branches, and the feeding excitation branch includes a feeding point for accessing a feeding signal; wherein, an electrical coupling is formed between the feeding excitation branch and the first radiating branch, and the feeding signal is coupled to the first radiating branch to form a first coupled feeding signal, and a magnetic coupling is formed between the feeding excitation branch and the second radiating branch, and the feeding signal is coupled to the second radiating branch to form a second coupled feeding signal, wherein the phase difference between the first and second coupled feeding signals is 90°, so that the first and second radiating branches have circularly polarized or elliptically polarized radiation characteristics, so that the antenna assembly supports satellite communication. The present application also provides an electronic device. The present application can realize satellite communication functions through a simple and compact antenna assembly.

This invention relates to a multi-core elliptical polarization-maintaining optical fiber and its fabrication method. The optical fiber includes a common cladding and polarization-maintaining core regions distributed within the common cladding. The polarization-maintaining core regions are elliptical, and there are at least three elliptical polarization-maintaining core regions spaced apart circumferentially. This invention features a compact structure, low crosstalk, and facilitates the placement of more polarization-maintaining core regions within a limited fiber cross-section. This allows the elliptical multi-core polarization-maintaining optical fiber to achieve higher density and greater capacity, as well as better polarization-maintaining performance, through space-division multiplexing. The uniform circumferential spacing of each elliptical polarization-maintaining core region forms a corresponding co-orientation structure, which is beneficial for controlling the cladding roundness during fiber drawing and for controlling inter-core crosstalk. This invention simultaneously increases the effective length of the optical fiber and achieves polarization-maintaining performance, providing more transmission channels and stronger birefringence performance, and has broad application prospects in the miniaturization of fiber optic gyroscopes and devices.

Cross door waveguide polarizer based on phase compensation relates to the field of microwave and antenna. The existing waveguide polarizer can only realize the conversion between linear polarization and left or right circular polarization, and the reconfigurable polarizer scheme of left or right elliptical polarization and conversion with arbitrary axial ratio cannot be realized. The waveguide polarizer comprises a 4-way power divider, a +45° accelerated phase shifter and a -45° delay phase shifter. The input end of the 4-way power divider is a linear polarization feed point port, which is used for dividing the input linear polarization electromagnetic wave into four equal amplitude and two opposite phase electromagnetic waves. The +45° accelerated phase shifter and the -45° delay phase shifter are alternately integrated on the four paths of the 4-way power divider, which are used for phase compensation of the four equal amplitude electromagnetic signals respectively. The electromagnetic signals have a continuous 90° phase difference. The electromagnetic signals pass through the cross door junction to form electromagnetic waves in the left or right circular polarizer, and the low axial ratio is maintained in a wide frequency band. The waveguide polarizer is also suitable for satellite communication field.

The invention discloses a communication electromagnetic wave adjustable linear polarization-to-circular polarization spherical lens antenna, a manufacturing method thereof, a communication base station, a communication system and a communication method, and belongs to the technical field of electronic communication antennas. The antenna comprises a controllable polarization spherical lens and a linear polarization feed source. The feed source is used for emitting polarized electromagnetic waves of which the linear polarization direction and the main axis direction form an inclined angle to the sphere; the length of an axial baseband of the electromagnetic baseband unit is configured to be greater than that of a radial baseband, so that the electromagnetic wave refractive index in the main axis direction is greater than that in the radial direction; and when the feed source is located at the equator part of the moving track, the electromagnetic waves are emitted in a circular polarization manner after being regulated and controlled by the lens. When the feed source is located at the end part of the sphere of the moving track, the polarization direction of electromagnetic waves is not changed after passing through the lens; and when the feed source is located between the equator part and the end part of the sphere, the electromagnetic waves are emitted in an elliptical polarization manner after being regulated and controlled by the lens. And three functions of high-gain wide-angle scanning, broadband working and adjustable polarization state are realized.

The invention discloses a 12-inch regenerated wafer surface film layer color automatic identification system and method. The system comprises: an adjustable multispectral illumination module configured with an annular LED array with a dynamic color temperature (3000K-6500K) and an incident angle (30-80 degrees); the air floating type rotary scanning mechanism realizes 360-degree dead-corner-free imaging; and the intelligent analysis module is used for carrying out color classification by adopting an Inception-ResNet network trained by transfer learning, and realizing process closed-loop control in combination with elliptical polarization film thickness verification. Through a multispectral fusion algorithm: # imgabs0 # dynamic compensation material optical property influence, roughness compensation and a dual verification mechanism are innovatively introduced, so that the color recognition accuracy reaches 99.3%, the detection efficiency is improved by 15 times, and the method is particularly suitable for high-precision detection of semiconductor regenerated wafers.

The invention discloses a nematic liquid crystal multi-frequency orthogonal reconfigurable antenna array unit, which comprises a multi-frequency radiation patch structure, the multi-frequency radiation patch structure is composed of two nested patches, the two patches are respectively an outer low-frequency radiation patch and an inner high-frequency radiation patch, and electromagnetic isolation between the two patches is realized through an annular gap etched on a dielectric substrate; the regulation and control method comprises the following steps: keeping the amplitude of an input signal of a radio frequency port corresponding to any frequency band unchanged, continuously regulating a liquid crystal dielectric constant through direct-current bias voltage, and changing the resonance characteristic of the frequency band; signals with a 90-degree phase difference are injected into the two radio frequency ports through the orthogonal feed network, and required elliptical polarized waves are formed in a radiation field of the frequency band in combination with phase delay change generated by dielectric constant tuning; the technical contradictions that polarization states of an existing liquid crystal reconfigurable antenna are mutually coupled in a multi-frequency-band working mode, continuous and accurate adjustment of an orthogonal polarization switching mechanism is difficult to achieve, driving voltage is too high, and the structure is complex, so that the profile is increased, and the manufacturing cost is increased are solved.

Systems and devices for detection and generation of polarized light are described. The described devices can be configured to detect light with one or more polarization states including light having linear, circular and elliptical polarization states. One example polarization detector includes two or more wires positioned to receive incident light. A first wire includes either an n-doped or a p-doped semiconductor material, a second wire can be a metal wire or can include an n-doped or a p-doped semiconductor material. The wires are in contact with one another and form one or more depletion regions when reverse biased. A portion of the incident light with a polarization state that matches geometrical characteristics of the wires is absorbed, and a portion of light with a polarization state that does not match the geometrical characteristics of the wires is transmitted through the wires.

The invention relates to the technical field of chip testing, in particular to an electrical property testing method, system and device based on a chip. According to the method, an auxiliary excitation coil is deployed around a to-be-detected chip silicon through hole array to generate a compensation magnetic field, the compensation magnetic field and an eddy current magnetic field are superposed to form an elliptically polarized magnetic field, a magnetic field sensor captures a long axis direction to extract real phase information of an original current magnetic field, and phase offset is dynamically compensated based on the phase information. And outputting the reconstructed current waveform, and finally identifying the chip defect according to the reconstructed current waveform. According to the method, the compensation magnetic field is generated by deploying the auxiliary excitation coil, the magnetic field sensor, the dynamic eddy current transfer function model and the like are combined, the current waveform is reconstructed to identify the defects, and high-precision detection and positioning of the defects such as chip micro short circuit are achieved.

This invention relates to the field of antenna technology, and in particular to an antenna system and electronic device, comprising an antenna element and a radome. The radome is located on the path of the antenna element's transmitted or received linearly polarized wave, and there is a rotational travel between the radome and the antenna element. A metal patch is disposed on the radome, which is used to change the electric field of the antenna element during at least a portion of the rotational travel. By rotating the radome, this invention allows for the switching and adjustment of the signal wave between linearly polarized, elliptically polarized, and circularly polarized waves according to usage requirements, achieving flexible adjustment of the signal processed by the antenna system. Furthermore, the structure is simple. Compared to existing circularly polarized antennas, it not only achieves stepless switching control of antenna polarization but also eliminates complex structures such as feed networks and multiple structural units, simplifying the system structure, reducing manufacturing difficulty and cost, improving the space utilization of the antenna system, and enabling miniaturized antenna system design.

The invention provides an on-line monitoring method and an on-line monitoring system for ion implantation. The on-line monitoring method for ion implantation comprises the following steps: constructing a plurality of single-factor models between the thickness of an amorphous layer formed on the surface of a sample substrate after ion implantation is carried out on the sample substrate and each process condition of corresponding ion implantation; a to-be-measured substrate after ion implantation is provided, an amorphous layer is formed on the surface of the to-be-measured substrate, and the thickness of the amorphous layer of the to-be-measured substrate is measured by adopting an elliptical polarization spectrometry method; and by using the thickness of the amorphous layer of the to-be-measured substrate, according to the single-factor model, obtaining process conditions for performing ion implantation on the to-be-measured substrate. According to the method, the thickness of the amorphous layer of the substrate after ion implantation and the corresponding single-factor model are obtained through the elliptical polarization spectrometry, and therefore high-speed, low-cost and full-dose-range online monitoring can be achieved on all technological conditions of ion implantation.

A miniaturized elliptical dichroism (mED) system for analyzing a sample includes a sample port for accepting a sample holder, an ultraviolet (UV) light source for providing UV light, optical components, a detector for detecting the incident light transmitted through the sample to generate detection data, a control board for controlling the optical components, and an enclosure for containing the UV light source, optical components, and the control board. The optical components are configured for modifying the UV light into incident light exhibiting rotating elliptical polarization and providing the UV light at the sample as incident light. A path traveled by the UV light from the UV light source to the detector defines an optical path, and the enclosure is configured for positioning the sample holder in the sample port in the optical path with respect to the UV light source, optical components, and the detector.

It is provided of a communication system capable of suppressing a fluctuation in a reception power of a known signal from a base station due to an attitude change of a radio relay apparatus, and performing an appropriate gain control of a power amplifier of the radio relay apparatus based on the reception power of the known signal, in case that the base station uses a plurality of linear polarization antennas for wireless communication with the radio relay apparatus. The base station comprises an antenna apparatus that has a plurality of linear polarization antennas capable of transmitting and receiving radio waves with different angles of linear polarization planes from each other when performing a feeder-link communication with the radio relay apparatus, and a base-station processing section or an externally-attached phase control apparatus for controlling a phase difference between plural transmission signals supplied to the plurality of the linear polarization antennas, so that a combined polarization of radio waves of the known signal transmitted from the antenna apparatus to the radio relay apparatus becomes a circular polarization or an elliptical polarization, with respect to a predetermined time slot for transmitting to the radio relay apparatus a specific known signal usable for gain control of a power amplifier of the radio relay apparatus.

The application discloses a spin terahertz emitter with adjustable polarization without an external magnetic field and a manufacturing method thereof. A metal thin film layer heterostructure is deposited on a surface of a glass substrate. A ferromagnetic layer is a FeNi thin film layer, an anti-ferromagnetic layer is an IrMn3 thin film layer, and an interface between the FeNi thin film layer and the IrMn3 thin film layer is an exchange coupling interface subjected to directional magnetic field induction treatment. A surface of the metal thin film layer heterostructure is a periodic stripe array structure. The manufacturing method comprises the following steps: a magnetron sputtering process is used to sequentially deposit a ferromagnetic layer, an anti-ferromagnetic layer and a protective layer; the exchange coupling interface is formed through directional magnetic field induction treatment; and a micro-nano processing process is used for patterning treatment. Beneficial effects are as follows: under the condition of no external magnetic field, reliable spin current generation, spin-charge conversion and terahertz radiation can be realized. The stripe patterning structure realizes linear polarization, elliptical polarization and near-circular polarization output. The 'zero-field emission function' and the 'polarization control function' are integrated in the same thin film device system, and the system complexity is reduced.

This invention relates to a high birefringence multi-core elliptical polarization-maintaining fiber and its fabrication method. The fiber includes a common cladding and stress regions and polarization-maintaining core regions distributed within the common cladding. There are at least three stress regions, evenly spaced circumferentially. The center lines connecting adjacent stress regions form a regular polygon. An elliptical polarization-maintaining core is positioned at the midpoint of each side of the regular polygon. The major axis of each elliptical polarization-maintaining core is aligned with the corresponding side of the regular polygon. Each elliptical polarization-maintaining core is configured with two adjacent stress regions to form a polarization-maintaining core region. This invention, by designing multiple elliptical cores and adding stress bars, provides more transmission channels, exhibits stronger birefringence performance, and reduces fabrication process requirements. The arrangement of shared stress regions forms multiple independent channels with a compact structure and low crosstalk, achieving higher density and greater capacity in multi-core polarization-maintaining fibers, and has broad application prospects in the miniaturization of fiber optic gyroscopes and devices.

The invention discloses a failure detection method and a regulation and control system for corrosion inhibition treatment of a silver alloy sheet-shaped electric contact chip. The failure detection method comprises the following steps: S1, acquiring the thickness of an organic protective film on the surface of the electric contact chip as dorg and the thickness of an oxide film as dox in real time through an elliptical polarization spectrum; s2, inputting the thickness dorg of the organic protective film or the thickness dox of the oxide film into a preset film thickness-contact resistance correlation model, and outputting to obtain a predicted contact resistance value Rc; s3, when the predicted contact resistance Rc is less than or equal to 25 m omega, judging that the electric contact piece is qualified, and when the predicted contact resistance Rcgt is obtained; and when the voltage is 25 m omega, judging that the electric contact piece is invalid, triggering a back-end processing flow, and returning to a front-end cleaning procedure. According to the method, the dynamic change effect of the predicted contact resistance value Rc is utilized to judge the failure condition of the electric contact chip in the front-end cleaning process, the bad reasons of the cleaning tank are checked in time, and the timeliness and reliability of failure detection of the electric contact chip are improved.