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46 results about "Rotational wave" patented technology

Mueller matrix testing device based on rotatable wave plate and method

InactiveCN102539119AThe parameter value range is looseSimple and easy to implementTesting optical propertiesEngineeringPolarizer
The invention relates to a testing device for realizing Mueller matrix of an optical device based on a rotatable wave plate and a method. A testing system consists of a laser device, a polarization generator, a tested device, a polarization analyzer, a voltage controller and a computer. Light generated by the laser device enters the polarization generator, the polarization generator consists of a polarizer and the rotatable wave plate, the rotation angle of the wave plate is larger than 180 degrees, rotation of the wave plate is controlled by voltage, and the polarization generator generates different polarization state outputs under different control voltages. Light outputted by the polarization generator enters the tested device, light outputted by the tested device directly enters the polarization analyzer, and the polarization analyzer detects corresponding output polarization states of the polarization generator and corresponding Stokes parameters of output polarization states of the tested device when in different control voltages. Afterwards, a linear system equation among detected input and output polarization state parameters and Mueller matrix parameters of the tested device is built, the computer solves the system equation, and then 16 parameters of the Mueller matrix can be solved.
Owner:SHANGHAI UNIV

Rotation device, method for controlling rotation of a driving source, computer readible medium and image forming apparatus including the rotation device

A rotation device includes a rotation member, rotation driving source, transmission mechanism, rotation pulse generation mechanism, target value arrangement mechanism, correction value computation mechanism, and control mechanism. The transmission mechanism decreases the rotation speed at a non-integer gear ratio. The target value arrangement mechanism includes a rotation unevenness provision mechanism to impart a plurality of kinds of sine-wave unevenness to the rotation speed target value. The correction value computation mechanism determines the correction value to adjust rotation fluctuation caused by a rotation axis eccentricity component of the rotation driving source and at least one noise component having a cycle relationship with a rotation cycle of the rotation member based on a time interval of a pulse train generated every rotation of the rotation member by the rotation pulse generation mechanism when the plurality of kinds of the rotation unevenness are imparted to the rotation speed target value.
Owner:RICOH KK

Improvements in or relating to millimeter and sub-millimeter wave radar-radiometric imaging

InactiveCN103339797AAdd information contentImprove imaging speedSimultaneous aerial operationsThermometers using physical/chemical changesDielectricRadar
An antenna is provided that is configured to implement a combined radar and radiometric imaging method. The antenna comprises: a bearing device on which is rigidly mounted: rotating waveguide adapter which provides the output for the antenna; an electromechanical drive, the output shaft of which is defined as the main axis of rotation for the antenna and a position sensor. The antenna further comprises an antenna rotor, the rotation of which is configured to be controlled by the out-put shaft of the electromechanical drive of the bearing device. The antenna rotor comprises: at least one 2D diffraction grating; planar dielectric waveguide connected over a diffraction field to the 2D diffraction grating; a linear waveguide turn; and a feed adapter.
Owner:RADIO PHYSICS SOLUTIONS

Embedded type polarization state measuring instrument based on LCD

The present invention relates to an embedded polarization state measuring apparatus, which is composed of a detection unit (1), liquid crystal type adjustable-phase delayer(s) (3, 4), a polarization beam-splitting prism (5), a collective lens (6), a photo detector (7) arranging in a shaft of a first part of the detection unit (1); a collective lens (8) and a photo detector (9) arranging in a shaft of a second part being orthogonal with the first part; a control unit (2) containing a signal-collection and liquid crystal control module (10), a data treatment module (11), a display module (12) and a RS232 serial port (13). By means of replacing rotational wave sheet by the liquid crystal type adjustable-phase delayer, It is able to control polarization state of incident light and measure Stokes parameter for real time quantity of polarization state accurately, and to overcome mechanical vibration problem; it is used for collimation of optical element(s), measurement of optical phase delay, material representation, medicament development, communication equipment, ellipse polarization instrument and spectrum application as well as space optical communication.
Owner:CHANGCHUN UNIV OF SCI & TECH

Non-contact ultra-wideband waveguide rotary joint, control system, method and application

ActiveCN111934063AGood electromagnetic transmission performanceAvoid structural wear and tearAntennas earthing switches associationWaveguide type devicesUltra-widebandEngineering
The invention belongs to the technical field of communication and radar antenna system components. The invention discloses a non-contact ultra wide band waveguide rotary joint, a control system, a control method and application, an arc surface periodic metal convex body array is designed outside a coaxial transition section, a rotatable non-contact electromagnetic band gap structure is formed by matching with a shielding cavity, broadband electromagnetic shielding is realized under a proper size, and non-contact rotatable coaxial transition is formed; electromagnetic signal transmission between the fixed waveguide and the rotary waveguide is achieved through broadband terminating type and orthogonal type coaxial-waveguide conversion, and the L-shaped waveguide rotary joint is achieved in cooperation with a bearing. According to the invention, a rotatable broadband non-contact electromagnetic band gap structure is constructed at the rotating part, so that good electromagnetic transmission performance of the rotating joint is ensured, the working bandwidth can completely cover the corresponding waveguide main mode bandwidth, and the non-contact structure avoids structural wear of therotating part, so that rotation is more stable, and the service life is longer; and the joint can be widely applied to various communication, radar and antenna feed systems.
Owner:XIDIAN UNIV

Alignment method for optical axes of composite waveplate

An alignment method for optical axes of a composite waveplate includes rotating a rotatable waveplate, which rotates about a central axis with respect to a fixed waveplate, and adjusting the rotation angle thereof until the differences between the spectral parameters of the composite waveplate and ideal spectral parameters are smaller than preset values.
Owner:WUHAN EOPTICS TECH CO LTD

Free space type Mueller OCT imaging system for full-automatic time division detection and imaging method

The invention discloses a free space type Mueller OCT imaging system for full-automatic time division detection and an imaging method. Four optical channels with different polarization types, namely horizontal type, vertical type, 45-degree linear polarization type and right-handed circular polarization type, are arranged in a reference wall, and meanwhile, a sample wall realizes polarized light of the four states by using a software program to control a rotating wave plate of a precision rotating worktable; a software program is also used in the reference wall to control an optical switch toselect different channels in the reference wall, and polarized light of the channels returns to interfere with the polarized light scattered by the sample wall correspondingly, so that time division detection of polarization information is realized; and meanwhile, 16 element images of a Mueller matrix of a sample are reconstructed, so that the collection of complete polarization information is realized. According to the free space type Mueller OCT imaging system for full-automatic time division detection and the imaging method, full-automatic control is realized, image acquisition can be rapidly carried out, and the sampling rate is improved.
Owner:FUJIAN NORMAL UNIV

Method and device for establishing security risk evaluation system in ocean and coastal environment

The invention discloses a method and a device for establishing a security risk evaluation system in ocean and coastal environment. The method comprises: establishing a seawater dynamic model of rotational wave ocean current of ocean and coastal environment; using the seawater dynamic model, performing simulation calculation on the parameter value of each dynamic phenomenon in ocean and coastal environment; using the calculated parameter value of each dynamic phenomenon, calculating hydrodynamic load and a breaking strength parameter of seawater; and based on the hydrodynamic load and the breaking strength parameter, establishing a security risk evaluation system in ocean and coastal environment. Through establishing the seawater dynamic model of rotational wave ocean current of ocean and coastal environment, the model is differ from a model established by irrotational hypothesis, so the established seawater dynamic model is more close to ocean and coastal environment in natural phenomenon, especially having nearshore environment with more turbulence flow. Therefore, accuracy of established seawater dynamic model is improved, so as to ensure accuracy of the security risk evaluation system.
Owner:国家海洋局海洋减灾中心

Method for detecting rotational wave packet of molecule

The invention discloses a method for detecting a rotational wave packet of a molecule, which comprises the following steps: exciting a molecule by using two beams of pumping light having a fixed timedelay to obtain a unidirectional rotational molecular beam; using a beam of probe light to act on the rotational molecular beam, and producing higher harmonics containing molecular rotational wave packet information; collecting a higher harmonic spectrum under different time delays and different polarization angles of the probe light and the pumping light; and deconvolving the higher harmonic spectrum to obtain rotational wave packet of the molecule. The method for detecting a rotational wave packet of a molecule in the invention proposes a method for acquiring the molecular rotational wave packet information by detecting the higher harmonics, which is a simple and effective method with broad applicability for simultaneously detecting an electronic dynamics process of an attosecond time scale and a nuclear dynamic process of a femtosecond time scale.
Owner:HUAZHONG UNIV OF SCI & TECH

Pupil shaping optical system for lithography machine and method for generating off-axis illumination modes

A lithography pupil shaping optical system and method for generating off-axis illumination mode. The invention is composed of illumination mode generation unit, rotatable wave plate, polarization beam splitter unit, ring I generation unit and ring II generation unit. Through selecting corresponding diffractive optical element and appropriate adjustment, this invention can generate various illumination modes including single ring illumination mode and double ring illumination mode. The intensity at pupil plane and the inner and outer diameters of the off-axis illumination mode can be adjusted continuously.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI

Ocean Wave Energy Harnessing Device

A system for extracting long wavelength ocean wave energy and for extracting rotational wave energy uses a plurality of boom elements connected to at least one hinge element for movement about the hinge element in a direction of the vertical force of a wave and for movement about the hinge element in a direction of the transverse force of a wave, and the hinge element includes a shaft transverse to the boom elements with a blade mounted to the shaft for rotational movement of the shaft in the direction of the rotational force of a wave.
Owner:FLORIDA INST OF TECH

Rotational wave nozzle

A rotational wave nozzle includes a fixed housing having a hollow cylindrical shape; a rotary cylinder inside the fixed housing such that the rotary cylinder is freely rotatable about the axial direction; a spray nozzle fixed on a front side of the rotary cylinder, emitting a compressed gas received by a rear end of the rotary cylinder outwardly, an emission direction of the spray nozzle being inclined relative to the axial direction of the rotary cylinder so that the emitted compressed gas causes the rotary cylinder and the spray nozzle fixed thereto to rotate; and a rotation suppressor fixed on a circumference side of the rotary cylinder, the rotation suppressor having a movable member that moves outwardly in a radial direction in response to a centrifugal force such that the movable member causes the rotation of the rotary cylinder due to the emitted compressed gas to be braked.
Owner:FUJI ELECTRIC CO LTD

Incident wave regulation and control method and device based on metamaterial waveguide array

ActiveCN111430927AReduce consumptionRapid change of equivalent refractive indexAntennasEngineeringIncident wave
The invention belongs to the technical field of metamaterials, and particularly relates to an incident wave regulation and control method and device based on a metamaterial waveguide array. The methodcomprises the steps of obtaining a regulation and control demand for an incident wave and the incident wavelength of the incident wave; constructing a waveguide unit according to the incident wavelength, wherein the length and the width of the waveguide unit are smaller than the incident wavelength; arranging a rotatable oval structure in the waveguide unit, wherein the waveguide and the oval structure are both made of materials meeting the Noryman boundary condition; constructing an array according to the waveguide units, the incident wavelength and the Fabry-Perot resonance conditions, wherein the array comprises a plurality of waveguide channels, and each waveguide channel comprises a plurality of waveguide units; respectively rotating the oval structure in each waveguide channel in the waveguide array according to the regulation and control requirements; and using the rotated waveguide array to regulate and control the incident wave. The waveguide array provided by the embodimentof the invention is simple in structure, is flexible and adjustable, and can simply and quickly regulate and control the incident waves.
Owner:SHENZHEN UNIV

Optimizing Algorithm for Controlling Drill String Driver

Apparatus and methods for optimizing a stick-slip algorithm for controlling a driver of a drill string. A method may include commencing operation of a control system for controlling the driver. The control system may have a processor and a memory storing a computer program code, which may include the stick-slip algorithm. The operating control system may receive a plurality of different numerical parameters, and for each of the different numerical parameters, incorporate the numerical parameter into the stick-slip algorithm and execute the stick-slip algorithm to determine a control command that causes the driver to rotate the drill string to perform drilling operations while reducing amplitude of rotational waves travelling along the drill string.
Owner:SCHLUMBERGER TECH CORP

Light emitting module

The invention provides a light emitting module comprising an optical isolator (1), the optical isolator (1) comprises a Faraday rotator (11) and a wave plate (12); the Faraday rotator (11) is used for performing non-reciprocal rotation on the polarization direction of an incident light signal, and the wave plate (12) is used for performing reciprocal rotation on the rotated incident light signal to obtain a light signal with the same polarization direction as the incident light signal before rotation; and the wave plate (12) is also used for carrying out reciprocal rotation on the polarization direction of the reflected light signal, and the Faraday rotator (11) is also used for carrying out non-reciprocal rotation on the rotated reflected light signal to obtain an optical signal orthogonal to the polarization direction of the reflected light signal before rotation. According to the light emitting module provided by the invention, the wave plate (12) is introduced into the optical isolator (1), and the optical fiber-free spatial optical coupling scheme of combining the lens with the optical isolator is adopted, so that the optical loss is effectively reduced, and the optical coupling efficiency is improved.
Owner:INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI

Alignment method for optical axis of compound wave plate and device for same

The present invention discloses an alignment method for the optical axis of a compound wave plate and a device for the same. Two wafers of a compound wave plate to be aligned are arranged on a bracket, and then are mounted on a fixed wave plate chuck and a rotary wave plate chuck respectively; light emitted from a light source forms linearly polarized light after passing through a polarizer; after passing through the compound wave plate to be aligned, the linearly polarized light become changed in the polarization state; according to the intensity signal of transmitted beam detected by a detector, the variation amplitude of the phase delay fluctuation quantity of the compound wave plate to be aligned can be obtained further; the relative magnitude of the variation amplitude of the phase delay fluctuation quantity is compared; and the rotary wave plate chuck is controlled to rotate through an electric control rotary table until the optical axis of the compound wave plate is aligned to be in the required precision range. The device comprises the light source, the polarizer, the fixed wave plate chuck, the rotary wave plate chuck, a rotary polarization analyzer, the detector, the electric control rotary table, a computer, a stepping motor and an electric control rotary table controller. The method can align the optical axis of a compound wave plate with high precision, the device is simply equipped, and the operation is simple.
Owner:HUAZHONG UNIV OF SCI & TECH

Low-power microwave coring machine suitable for lunar rock and using method

The invention provides a low-power microwave coring machine suitable for lunar rock and a using method. The low-power microwave coring machine comprises an equipment platform, wherein a supporting frame front plate and a supporting frame rear plate are slidably mounted on the equipment platform; the rear end face of the supporting frame rear plate is connected with the front end of a microwave generator mounted on the equipment platform; the rear end of the microwave generator is sequentially connected with a fixed waveguide, a rotating waveguide, a power divider and a drilling barrel; a high-precision sliding ring structure is mounted on the drilling barrel; gear clamping sleeves are arranged on the outer walls of the rotating waveguide and the drilling barrel and meshed with a transmission gear mounted on a rotating shaft; the rotating shaft is connected with a rotating driver; the rear end of a tunneling driver is fixed on the equipment platform; and the front end of the tunneling driver penetrates the supporting frame rear plate to be connected with the supporting frame front plate. Synchronous movement of a microwave system and the drilling barrel is realized, hard rock is drilled under the condition of meeting equipment miniaturization and low power, and the problems of failure in drilling and jamming of a drill can be avoided; through multi-port millimeter wave irradiation of the power divider, complete breaking of an outer ring of a rock core is realized while the rock core is not broken.
Owner:NORTHEASTERN UNIV

Electronically controlled depolarizer based on crossed-slit waveguide

An electrically controlled depolarizer based on a crossed-slit waveguide (3) includes a horizontal-slit waveguide (1), a 45-degree polarization rotation waveguide (2), a pair of modulation electrodes (4) and the crossed-slit waveguide (3). Broad-spectrum TM (transverse magnetic) polarized light is inputted from one end of the horizontal-slit waveguide (1), and then a part of the broad-spectrum TM polarized light is converted into broad-spectrum TE (transverse electric) polarized light through the 45-degree polarization rotation waveguide (2), and then the broad-spectrum TE polarized light and the remaining broad-spectrum TM polarized light enter an input end of the crossed-slit waveguide (3); the board-spectrum TE polarized light is transmitted in a vertical slit of the crossed-slit waveguide (3); the remaining broad-spectrum TM polarized light is transmitted in a horizontal slit of the crossed-slit waveguide (3); and the broad-spectrum TE polarized light and the remaining broad-spectrum TM polarized light form depolarized light at an output end of the crossed-slit waveguide (3). The pair of modulation electrodes (4) realize the precise adjustment of the rotation angle of the 45-degree polarization rotation waveguide (2) by electronic control, such that the TE polarized light and the TM polarized light at the output end of the crossed-slit waveguide (3) have equal energy, thereby overcoming uneven light splitting caused by loss of the polarization rotation waveguide and TE and TM waveguide transmission loss.
Owner:ZHEJIANG UNIV

Contact vibration detection device, rotary machine including the same, and contact vibration detection method

A contact vibration detection device 100 for detecting contact vibration due to contact between a rotational shaft 12 and a stationary part 13 includes: a rotation waveform determination unit 101 configured to determine a rotation waveform of the rotational shaft 12 based on displacement of the rotational shaft 12 during rotation; a parameter change detection unit 102 configured to detect a change in a parameter of at least one of an effective value of the rotation waveform or a phase angle of the rotation waveform; and a contact vibration determination unit 103 configured to determine whether the contact vibration occurs based on presence or absence of the change in the parameter.
Owner:MITSUBISHI HEAVY IND LTD

Circular polarization probe antenna structure

The invention relates to the antenna design field, and especially relates to a circular polarization probe antenna structure comprising a feed portion, a metal housing, and a medium filling portion connected in order; the feed portion is in a disc type; a rectangular waveguide is arranged in the center of the disc type feed portion; the medium filling portion comprises a frustum, a cylinder portion and a waveguide step portion connected in order; the waveguide step portion comprises at least two waveguide steps; the top of the waveguide step portion is provided with a rotating waveguide segment; the rotating waveguide segment is matched in shape with the rectangular waveguide, and inserted in the rectangular waveguide; the metal housing wraps the cylinder portion and the waveguide step portion.
Owner:成都雷电微力科技股份有限公司

Optical rotating device, lighting system and projection device

An optical rotating device includes a substrate, a rotating shaft, a driving element, a wavelength conversion layer and a polarizing element. The substrate has opposing first and second surfaces. The rotating shaft is connected to the base plate. The driving element is connected to the rotating shaft and used to drive the rotating shaft to rotate. The wavelength conversion layer is configured on the first surface of the substrate to convert the first laser beam into a converted beam. The polarizing element is arranged on the second surface of the substrate, wherein the first laser beam and at least one second laser beam are respectively transmitted to the wavelength conversion layer and the polarizing element from opposite directions, and the driving element is used to drive the substrate, the wavelength conversion layer, and the polarizing element to The rotation axis is the rotation center axis, and when the polarizing element rotates, the polarizing element is used to make at least one second laser beam output from the polarizing element have different polarization states at different times. An illumination system and a projection device are also presented. The projection device of the present invention can provide a display screen with uniform color or light and dark.
Owner:CORETRONIC

Method and device for measuring phase delay spectral characteristic of wave plate

ActiveCN103196658BUnaffected by measurement resultsEasy to useTesting optical propertiesContinuous lightData acquisition
The invention discloses a method and a device for measuring a phase delay spectral characteristic of a wave plate, comprising a broadband light source; and continuously emergent light is received after passing through a multi-wavelength photoelectric detector through a collimator, a polarizer, two wave plates to be detected, a polarization analyzer and an optical splitter respectively, wherein the two wave plates to be detected are connected with a motor, data received by the multi-wavelength photoelectric detector are uploaded to a data acquisition card which transmits the data to a computer which is connected with the motor. The method disclosed by the invention can automatically measure the phase delay spectral characteristics of the two wave plates to be detected within a wide spectral range, not only can be used for measuring the phase delay spectral characteristics of two rotary wave plates in a rotating double-compensator type broad-spectrum ellipsometer so as to eliminate system errors caused by inaccurate calibration, but also can be used for directly calibrating the phase delay spectral characteristics of two unknown wave plates in practical production and research work, and besides, the measurement result is not influenced by the light source and the spectral characteristic of a detector.
Owner:SHANDONG UNIV

Wavelength switching type semiconductor laser

The invention provides a wavelength switching type semiconductor laser. The laser comprises a gain chip, an external cavity frequency selection device and a wave plate, an F-P resonant cavity is formed between the external cavity frequency selection device and the gain chip, the structure of the external cavity frequency selection device is a planar waveguide grating, and based on the birefringence effect of the planar waveguide grating, a TE mode and a TM mode reflected by the external cavity frequency selection device are split; and the wave plate is arranged in the F-P resonant cavity, the loss and gain of the TE mode and the TM mode in the F-P resonant cavity are adjusted by rotating the wave plate, and lasing switching of the TE mode and / or the TM mode in the F-P resonant cavity is achieved. The laser has the characteristics of high compactness and high integration, and can realize the modularization of butterfly-shaped packaging and the miniaturization of devices; and meanwhile, the preparation process of the key component is simple, and the selection of two modes can be realized by a single frequency selection device prepared by only one mask plate, so that the cost is further reduced.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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