44 results about "Rotational wave" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.