17 results about "Common path" patented technology

The invention discloses a high-flux super-resolution laser direct writing device and method based on a metasurface, and the device employs a single metasurface to achieve the simultaneous shaping of an excitation light array and a suppression light array through wavelength polarization multiplexing, and replaces a complex independent shaping and beam combination light path in a conventional scheme. The system structure is greatly simplified, generated excitation light and suppression light are completely transmitted in a common path after passing through the DMD and are shaped by a single metasurface, the alignment error and relative drift problems of two light beams are eliminated, and the stability of the super-resolution processing effect is ensured.

A method for clock tree synthesis and a computer-readable storage medium are disclosed. The method includes: acquiring a global clock tree of a target circuit, the global clock tree comprising multiple timing skew groups; determining sub-clock trees corresponding to each timing skew group based on each timing skew group, wherein each sub-clock tree includes a common path and several non-common paths branching from the common path, and the common and non-common paths each include several components; for each sub-clock tree: determining a drive object to be processed based on the common path of the sub-clock tree; calculating the load center location based on the several non-common paths; inserting a load center component at the load center location; when the components on the common path where the inserted load center component is located, and the components adjacent to the load center component in each of the non-common paths connected to the inserted load center component, do not meet preset design constraints, setting several signal conditioning units between the drive object to be processed and the inserted load center component.

The application discloses a liquid refractive index sensing system and method based on an optical waveguide structure and weak measurement. The application comprises an SLD light source, a Gaussian filter, a polarizer I, a polarizer II, an optical waveguide, a quarter-wave plate I, a quarter-wave plate II and a spectrometer. The SLD light source emits laser with a center wavelength of 830 nm, and the laser is pre-selected by the front selection polarizer after passing through the Gaussian filter. The light is emitted after multiple total internal reflections on the surface of the waveguide of the liquid to be measured, the phase of the p and s polarizations of the emitted light is adjusted by the wave plate, the light is post-selected by the post-selection polarizer, the emitted light is received by the spectrometer and the center wavelength is analyzed, and finally the refractive index of the liquid to be measured is calculated according to the center wavelength displacement by the computer. The application also provides a liquid refractive index sensing method based on an optical waveguide structure and weak measurement. The application realizes straight-line common path and multiple reflections through the optical waveguide, and has higher stability and sensitivity than traditional measurement methods.

The application discloses a service transmission method, an electronic device, a storage medium and a program product, and belongs to the technical field of automatic switching optical networks. A service transmission method comprises the following steps: based on a networking structure, a common path, a branch path and a branch station for transmitting a target service from a target source station to multiple sink stations are acquired, wherein the branch station is a starting station of the branch path; in response to transmitting the target service, the target service is transmitted from the target source station to the branch station corresponding to each sink station through the common path, so that the branch station transmits the target service to each sink station through the branch path corresponding to each sink station.

The application discloses a bottom-up clock tree synthesis method and system, which comprises inserting a logic unit to be inserted between a driver and a load connected to the driver; judging whether a clock tree with the inserted logic unit meets a design rule constraint, if yes, the insertion of the logic unit between the driver and the load connected to the driver is completed, if not, taking the inserted logic unit as a new load and starting from the insertion of the logic unit to be inserted between the driver and the load connected to the driver. When the logic unit is inserted, the logic unit is inserted layer by layer from bottom to top, and leaf nodes which need to share clock paths as much as possible due to clock skew, common control critical path and other reasons can be divided under the same sub-tree as early as possible in the bottom layer, so that the power consumption and the chip area occupied are reduced, the problem that the common path of the leaf nodes of the critical path is too short is avoided, and the clock tree synthesis situation of a buffer, an inverter or a mixture of both can be applied.

The semiconductor device includes an n-type first semiconductor region 11 formed on a surface side of a p-type semiconductor substrate 10 and serving as a common path for currents flowing through a switching element and a protection element, an n-type common contact region 12 formed on the first semiconductor region 11 with a high impurity concentration and connected to a common electrode 21 serving as both a first main electrode and a protection element side first electrode, a p-type second semiconductor region 13 and a p-type third semiconductor region 14 locally formed in the first semiconductor region 11 at locations separated from the common contact region 12, and an n-type fourth semiconductor region 15 locally formed in the second semiconductor region 13 in plan view. A second main electrode 22 is connected to the fourth semiconductor region 15, and a protection element side second electrode 26 is provided inside the third semiconductor region 14.

This invention discloses a dual-laser synergistic high-temperature, high-speed rotating object axial vibration measurement device, relating to the field of vibration detection technology. It includes a main plate and a radiation-resistant plate mounted on the main plate. A drive motor is installed on the main plate. Measuring the dynamic characteristics, such as axial vibration, of a high-speed rotating object at high temperatures is a challenging problem. This device uses a dual-laser measuring instrument for measurement, and also features non-contact functionality. Furthermore, the dual lasers can compensate for light path disturbances caused by hot airflow. Specifically, one laser acts as the main measurement optical path, while the other acts as a reference optical path, specifically monitoring common path optical noise caused by hot airflow. Through differential calculations by a subsequent signal processor, environmental noise is subtracted from the main signal, thereby extracting the pure vibration signal of the measured turntable.

Disclosed is a method and a device for rapidly measuring the transmission matrix of an ultra-long optical fiber, belonging to the field of information optics. The solution couples the spatial mode into ultra-long few-mode / multi-mode optical fiber for transmission. By obtaining the common path reference light at the output end of the ultra-long few-mode / multi-mode optical fiber and interfering with the signal light at the output end, the complex amplitude distribution of the signal light field output by the optical fiber is reconstructed, weight coefficients of different modes are obtained by performing overlapping integral on the complex amplitude distribution and the ideal complex amplitude distribution of different spatial modes. The transmission matrix of the ultra-long few-mode / multi-mode optical fiber can be obtained by rapidly switching the mode incident into the ultra-long few-mode / multi-mode optical fiber and sequentially calculating the weight coefficients of the different modes at the output end.

The invention discloses a time sequence optimization system for eliminating chip OCV influence. The system comprises a global clock source module, a pre-stage clock tree module, a pre-stage data transmission module, an FIFO core processing module, a post-stage clock tree module and a post-stage data transmission module. The global clock source module provides a homologous original clock for the front-stage clock tree module and the rear-stage clock tree module, the front-stage clock tree module and the rear-stage clock tree module respectively construct independent small clock trees, and asynchronous write and read clocks are provided for the front-stage data transmission module, the rear-stage data transmission module and the FIFO core processing module; the FIFO core processing module interrupts the clock phase dependence of the synchronous circuit through an asynchronous read-write mechanism, divides an original single large clock tree and a long data channel into two independent subsystems, and achieves asynchronous caching and transmission of front-stage data and rear-stage data. According to the invention, the delay deviation superposition influence of the OCV on a clock non-common path is eliminated from the source, the time sequence convergence design difficulty is greatly simplified, and the rapid convergence of the chip time sequence is realized.

The application discloses a clock tree structure and an implementation method thereof, and relates to the technical field of clock trees.The clock tree structure comprises a trunk clock network and a branch clock network.The trunk clock network is introduced from outside and is composed of a first-stage buffer unit and a second-stage buffer unit.The trunk can be horizontal or vertical.The branch clock network is introduced from the trunk clock network and is composed of a second-stage buffer unit to a third-stage buffer unit.The branch clock drives the load in a window with an L*L size, that is, the third-stage buffer unit drives a fourth-stage buffer unit in a tree structure, and so on, to drive an nth-stage buffer unit and a gated clock unit.The beneficial effects are as follows: the clock tree structure is built by establishing the trunk clock network and the branch clock network, the number of buffer units on the clock network is reduced, and the chip power consumption is reduced;the main clock tree and the sub clock network play the role of a common path, the number of stages of the clock tree is reduced, the influence of OCV on the clock is reduced, and the final timing convergence is easy.

The present invention relates to a method and arrangement for providing a complete row of mineral fiber slabs in a mineral fiber slab production process. In this method, a complete row of mineral fiber slabs is transported in the production process, with each row containing a predetermined number of mineral fiber slabs. Defective slabs are removed, thereby forming one or more incomplete rows of mineral fiber slabs. The complete and incomplete rows are transported on a conveyor along a common path in a first direction of movement, with one or more replacement slabs inserted into each incomplete row from at least one slab buffer before the stacker. The incomplete rows are thus made into a complete row containing a predetermined number of mineral fiber slabs.

A cementitious product (1) comprising: a substrate (2) formed from a cementitious material; and at least one branched channel (3) embedded within the substrate configured to provide a conduit for a second material to flow through the substrate; wherein the at least one branched channel comprises a plurality of interconnected channel elements, the plurality of interconnected channel elements comprising at least one diverging portion at which a plurality of paths diverge from a common path, and / or at least one converging portion at which a plurality of paths converge to a common path.

This invention relates to the field of microjets laser technology and discloses a microjets laser anti-backflow device, comprising: a housing, wherein a water inlet is provided on the surface of the housing, a lens is installed on the inner wall of the housing, a water flow surrounding cavity is provided on the inner wall of the housing, and a flow stabilizing mechanism is provided on the inner wall of the water flow surrounding cavity; and a mounting block, wherein the mounting block is installed on the inner wall of the housing, and a plurality of water flow holes and a flow injection hole are respectively provided inside the mounting block, and the water flow holes and the flow injection hole are connected. This invention can reduce water flow turbulence and bubble generation, and can achieve step-by-step flow stabilization, avoid local eddies, and ultimately form an ideal laminar flow at the nozzle, thereby improving processing accuracy. It can also cut off the most common path for bubble generation, avoid large bubbles generated by turbulent mainstream flow and vortex entrainment of air, and prevent gas precipitation throughout the flow area caused by large fluctuations in flow rate or pressure.

The application relates to the technical field of optical detection, and discloses a single-time absolute measurement system and method for a reflecting surface shape, which comprises a spectrum separation unit, a wavefront measurement and collection unit and a surface shape recovery unit; the spectrum separation unit divides a light beam emitted by a light source into a reference light beam and a test light beam, a beam splitting optical wedge is used to superimpose a linear phase carrier frequency on the test light beam and project the test light beam to a measured mirror; the wavefront measurement and collection unit receives the reference light beam and the test light beam reflected back, performs two-dimensional shearing through a chessboard grating, and records a lateral shearing interference pattern of single-time exposure by means of a photoelectric detector; the surface shape recovery unit performs frequency domain demodulation on the interference pattern, intercepts a first-order spectrum component to obtain a demodulation complex amplitude, eliminates a system common path error through a conjugate multiplication operation, extracts an absolute phase gradient field, and constructs a Poisson equation to calculate an absolute surface shape height distribution of the measured mirror. The application does not need multi-step phase shifting, reduces environmental sensitivity, simplifies an optical structure and reduces system measurement error.

The invention relates to the technical field of optical detection, and discloses a reflection surface shape single absolute measurement system and method, and the system comprises a frequency spectrum separation unit, a wavefront measurement collection unit and a surface shape recovery unit. The spectrum separation unit divides a light beam emitted by the light source into a reference light beam and a test light beam, and a beam splitting optical wedge is used for superposing a linear phase carrier frequency for the test light beam and projecting the test light beam to a tested reflector; the wavefront measurement and acquisition unit receives the reference light beam and the reflected test light beam, two-dimensional shearing is carried out through a chessboard grating, and a transverse shearing interferogram of single exposure is recorded by a photoelectric detector; and the surface shape recovery unit performs frequency domain demodulation on the interferogram, intercepts a first-order frequency spectrum component to obtain a demodulation complex amplitude, eliminates system common-path errors through conjugate multiplication operation, extracts an absolute phase gradient field, and constructs a Poisson equation to calculate absolute surface shape height distribution of the measured reflector. According to the invention, multi-step phase shift is not needed, the environmental sensitivity is reduced, the optical structure is simplified, and the system measurement error is reduced.

The application discloses an electro-optic crystal electric field sensing device and method based on dual-wavelength differential measurement, relates to the technical field of sensing, and utilizes the port isolation characteristic of a polarization maintaining ring to make incident light emitted by a light source enter from a first port, is output to an electro-optic crystal through a second port, and is returned along an original light path after being reflected by a reflecting sheet, passes through the electro-optic crystal, a collimating lens and the polarization maintaining ring again, and is guided to a third port to be output to a spectrometer, so that bidirectional transmission of the input and output of the light signal in the same optical fiber is realized; the complexity of the electric field sensing system is reduced, so that the cost is reduced; and the single-fiber bidirectional transmission reflection structure realized by the polarization maintaining ring integrates the originally separated input / output light paths into a common path, cancels the polarization state drift caused by environmental disturbance, and thus the measurement accuracy is improved. Therefore, the cost is reduced while the measurement accuracy of the electric field sensing device is ensured.

An arthroscopic apparatus with integrated optical-photoacoustic multi-modal imaging, and an imaging method therefor. The arthroscopic apparatus comprises a light source and optical path system (2), a control and data collection system (1), and an arthroscopic probe (14). The imaging method therefor comprises the following steps: pulsed excitation light passing through a focus-adjustable collimator and entering an arthroscopic probe (14) via an optical path system; by means of a combination of a hollow servo electric motor (22) and a λ / 2 sheet (23), realizing the modulation of polarized light; by means of a dichroic mirror (24), realizing a common path of pulsed light of different wavelengths; by means of a beam splitter (19), realizing a common path of white light and pulsed light; using a MEMS mirror (20) to realize rapid scanning of tissue by the pulsed light; a micro-transducer (31) collecting an echo signal; a computer (17) completing image reconstruction for photoacoustic, photoacoustic polarization and photoacoustic elasticity imaging; and a charge-coupled device (18) of the arthroscopic probe (14) collecting an optical signal for optical image reconstruction. The present invention realizes optical, photoacoustic, photoacoustic polarization and photoacoustic elasticity imaging by means of the integrated arthroscopic probe (14), and can be used for microvascular assessment within a joint cavity, and the assessment of anisotropy and biomechanical properties of cartilage and ligaments.