45 results about "Parallel polarization" patented technology

The present invention is a hand held dermoscopy epiluminescense device with a magnification lens and an associated ring of luminous diodes powered by an on board battery. Every other diode in the ring operates as first and second light sources. The even diodes are filtered by a first polarization ring and the odd diodes are filtered by a second polarization ring. Each polarization ring has an open center for the lens and openings sized and positioned to correspond to the even or odd diodes to only filter one set. A viewing polarizer is provided and is cross-polarized relative to the first polarization ring and is parallel-polarized with the second polarization ring. A three way switch which provides on demand cross-polarized, parallel-polarized and a combination thereof for epiluminescence. A second embodiment provides even diodes of a first color and odd diodes of a second color. A third embodiment employs the alternating colored diodes of the second embodiment as well as the cross and parallel polarization of the light from the diodes as found in the first embodiment.

The present invention relates to an illuminated personal hygiene mirror for viewing facial skin or other areas of the body. In each of the embodiments of the present invention, a hand-held frame receives and supports a mirror. The mirror is covered with a polarizer for polarizing any reflected light falling thereon. A light source is positioned within the frame about the periphery of the mirror and is covered by a polarizing filter for polarizing light emitted therefrom. The mirror polarizer and light source polarizer are out of phase providing cross-polarized light to the eye of the user. An integral handle supports the frame and is held by the user when viewing facial skin. Other embodiments of the present invention include the same components, except a two-way mirror is employed and the mirror frame has a removable back portion to allow viewing by a second person. Other embodiments include an illuminated mirror employing cross and parallel polarization using two light sources. Other embodiments incorporate the use of a mirror filter which can rotate within the frame of the mirror to provide variable polarization to the user.

A multiview face capture system may acquire detailed facial geometry with high resolution diffuse and specular photometric information from multiple viewpoints. A lighting system may illuminate a face with polarized light from multiple directions. The light may be polarized substantially parallel to a reference axis during a parallel polarization mode of operation and substantially perpendicular to the reference axis during a perpendicular polarization mode of operation. Multiple cameras may each capture an image of the face along a materially different optical axis and have a linear polarizer configured to polarize light traveling along its optical axis in a direction that is substantially parallel to the reference axis. A controller may cause each of the cameras to capture an image of the face while the lighting system is in the parallel polarization mode of operation and again while the lighting system is in the perpendicular polarization mode of operation.

The present invention relates to an illuminated personal hygiene mirror for viewing facial skin or other areas of the body. In each of the embodiments of the present invention, a hand-held frame receives and supports a mirror. The mirror is covered with a polarizer for polarizing any reflected light falling thereon. A light source is positioned within the frame about the periphery of the mirror and is covered by a polarizing filter for polarizing light emitted therefrom. The mirror polarizer and light source polarizer are out of phase providing cross-polarized light to the eye of the user. An integral handle supports the frame and is held by the user when viewing facial skin. Other embodiments of the present invention include the same components, except a two-way mirror is employed and the mirror frame has a removable back portion to allow viewing by a second person. Other embodiments include an illuminated mirror employing cross and parallel polarization using two light sources. Other embodiments incorporate the use of a mirror filter which can rotate within the frame of the mirror to provide variable polarization to the user.

Two-pump optical parametric devices (OPDs), and methods of operating the same, generate desired output signals and idlers having reduced stimulated Raman scattering (SRS) noise levels. When the two-pump OPD is used as a two-pump optical parametric amplifier (OPA), the pumps are polarized perpendicular to each other, and the lower-frequency sideband (signal or idler) is polarized parallel to the lower-frequency pump (perpendicular to the higher-frequency pump). The desired output may be an amplified signal or a generated idler. When the two-pump OPD is used as a two-pump optical frequency converter (OFC), the pumps can be polarized parallel to one another, in which case the signal and idler are both perpendicular to the pumps, or perpendicular to one another, in which case the lower-frequency sideband (signal or idler) is polarized parallel to the lower-frequency pump (perpendicular to the higher-frequency pump).

Systems and methods for measuring the state of polarization (SOP) for each wavelength channel in a multi-wavelength-channel light beam are disclosed. The system includes a set of two or more rapidly switchable waveplates switched to form a sequence of secondary light beams having different polarizations. A polarizer filters the set of secondary light beams, and a spectral dispersing element spatially divides the secondary light beams into their respective wavelength components. A detector array measures in parallel the intensity of the different wavelength components for each of the polarization-filtered light beams. A controller stores the intensity measurements and calculates the Stokes parameters for each wavelength component, thereby characterizing the SOP for all the wavelength channels of the multi-wavelength light beam.

The invention discloses a time division multiplexing based single-detector all-fiber polarization lidar. The lidar adopts all-fiber link, utilizes a delay fiber to realize time division multiplexing, and uses a single detector to realize simultaneous detection of parallel polarization signals and vertical polarization signals in radar echoes. Detection of atmospheric depolarization ratio is realized with the single detector, and the liar has the advantages of low cost, system stability, relative eye safety, all-fiber link, compact structure and the like.

The invention discloses an outdoor all-weather and all-time atmospheric aerosol particle laser radar device which comprises an integrated square cabin, a laser, an intelligent control unit, an optical unit, a signal acquisition and analysis unit, an electric wiper, and a blowing device. The intelligent control unit controls the operation of the machine equipment. The laser emits pulse laser, which is incident on the atmosphere after beam expansion. An optical receiving unit receives back scattered light of atmospheric aerosol particles. A polarization detection prism of a receiving channel separates vertical polarization components from parallel polarization components. A photoelectric detection module converts the light into electrical signals. The signal acquisition and analysis unit acquires, analyzes and displays the electrical signals. Thus, vertical distribution information of the atmospheric aerosol particles is obtained. The device improves the signal-to-noise ratio of detection signals, and has such functions as lightning protection design, photoelectric detection module high-voltage online program-controlled adjustment, instrument internal temperature monitoring and automatic skylight cleaning. The device has a protection grade up to IP65, and meets the requirement for outdoor all-weather and all-time operation.

Laser speckle microrheology is used to determine a mechanical property of a biological tissue, namely, an elastic modulus. Speckle frames may be acquired by illuminating a coherent light and capturing back-scattered rays in parallel and cross-polarized states with respect to illumination. The speckle frames may be analyzed temporally to obtain diffuse reflectance profiles (DRPs) for the parallel-polarized and cross-polarized states. A scattering characteristic of particles in the biological tissue may be determined based on the DRPs, and a displacement characteristic may be determined based at least in part on a speckle intensity autocorrelation function and the scattering characteristic. A size characteristic of scattering particles may be determined based on the DRP for the parallel polarization state. The mechanical property may be calculated using the displacement and size characteristics.

A laser scanner, in particular a safety laser scanner, in accordance with the operating principle of the time of flight process, comprising a light transmission unit having at least one light transmitter for transmitting a polarized transmitted light beam into a monitored zone; a light reception unit having at least one light receiver for detecting the polarization component of the light reflected in the monitored zone being orthogonal to the polarization direction of the transmitted light beam, and / or the polarization component of the light reflected in the monitored zone being parallel to the polarization direction of the transmitted light beam, and for generating a received signal corresponding to the detected orthogonal polarization component and / or the detected parallel polarization component; and an evaluation unit configured to evaluate the time development of the detected orthogonal polarization component and / or of the detected parallel polarization component.

The invention provides a Brewster law demonstrating and refractive index measuring instrument. The Brewster law demonstrating and refractive index measuring instrument consists of a barrel, a frame 1, a scale plate, a frame 2, angle scale marks, a semicircular optical element, a reflecting light outlet, a photoelectric converter, a polarization detector, a shielding wire, a positioning screw 1, a reflecting outlet cover plate, a transparent panel, a base, a smoke injecting hole, a positioning screw 2, an incident light inlet, a slot, a retaining ring, a laser indicator jack, a laser indicator, a direction adjusting screw, a support, an incident light inlet cover plate, a round hole, a polarization detector slot, a parallel polarization mark, a perpendicular polarization mark and a photoelectric conversion element, wherein the laser indicator is inserted in the retaining ring; the round hole is formed in the longitudinal axis direction of the photoelectric converter; the polarization detector slot is formed in the middle of the photoelectric converter; the polarization detector is inserted in the polarization detector slot; one end of the round hole is sealed by the photoelectric conversion element; and the photoelectric conversion element is connected with a micro-current measurer via the shielding wire.

The invention relates to an instantaneous phase-shift transverse shear interferometer, which aims to solve the problems of troublesome operation, high requirements of systems for environment, large influence of environment on acquisition results in the prior art. The instantaneous phase-shift transverse shear interferometer provided by the invention comprises a parallel polarization beam splitter 2, a one-quarter wave plate 3, a two-dimensional rectangular grating 4, a first convex lens 5, a spatial filter 6, a second convex lens 7, a polaroid array 8 and a CCD 9 which are concentrically arranged in turn on a main optical axis, wherein the CCD 9 is connected with a computer 1; the direction of an optical axis of a crystal of the parallel polarization beam splitter 2 and an incident surface are at an included angle of 45 degrees; the direction of a fast axis of the one-quarter wave plate 3 is positioned on a plane at an angle of 45 degrees to the plane consisting of the direction of the optical axis of the crystal of the parallel polarization beam splitter 2 and the main optical axis; and the spatial filter 6 is arranged on a back focal plane of the first convex lens 5 and a front focal plane of the second convex lens 7. The interferometer has the advantages of reducing the requirements of the systems for environment and increasing measurement accuracy, along with easy operation.

The invention discloses a design method for a metasurface with a generalized Brewster effect, and belongs to the technical field of electromagnetic fields and microwaves. The invention aims to solve the problems that the application of the existing classical Brewster effect is limited by parallel polarization electromagnetic waves and is sensitive to polarization. The method comprises the steps: according to a mathematical expression of a Brewster angle at an anisotropic medium interface, obtaining basic conditions required to be met by a unit metasurface; constructing a unit metasurface structure capable of generating a predetermined amount of magnetic response under the excitation of a magnetic field according to the basic conditions; sequentially combining the plurality of unit metasurface structures together to form a metasurface layer; sequentially arranging the metasurface layers at intervals in the preset direction, and forming a grid-shaped metasurface meeting the vertical andparallel polarization electromagnetic wave Brewster effect, wherein the grid-shaped metasurface is placed in the direction perpendicular to the medium interface and an electromagnetic wave incident plane. The method is used for designing a metasurface meeting the generalized Brewster effect.

Laser speckle microrheology is used to determine a mechanical property of a biological tissue, namely, an elastic modulus. Speckle frames may be acquired by illuminating a coherent light and capturing back-scattered rays in parallel and cross-polarized states with respect to illumination. The speckle frames may be analyzed temporally to obtain diffuse reflectance profiles (DRPs) for the parallel-polarized and cross-polarized states. A scattering characteristic of particles in the biological tissue may be determined based on the DRPs, and a displacement characteristic may be determined based at least in part on a speckle intensity autocorrelation function and the scattering characteristic. A size characteristic of scattering particles may be determined based on the DRP for the parallel polarization state. The mechanical property may be calculated using the displacement and size characteristics.

The invention is a three-line array CCD scanning-mode polarizing, imaging and detecting device, and in its light path, optical lens group, filtering plate, parallel polarization detectors at the angles of 0 deg., 60 deg. and 120 deg., and three-line array CCD detectors are installed in turn, where the polarization detectors are polarizing plates pasted on the surface of the CCD detectors or three-column picture elements coated on the surface of the CCD detectors, corresponding to the CCD detectors. The signals of the CCD detectors are inputted into a data collecting, transmitting and imaging system. The invention adopts a line-array scanning and imaging mode, and only need use a public optical imaging system, thus compact, small-sized, light and low-power, and suitable for a moving platform whose load space is limited to work; at the same time, because of less energy losses and relatively higher SNR, it is suitable to carry out polarization detection on the object to obtain polarization data in a further distance and at a larger height.

A multiview face capture system may acquire detailed facial geometry with high resolution diffuse and specular photometric information from multiple viewpoints. A lighting system may illuminate a face with polarized light from multiple directions. The light may be polarized substantially parallel to a reference axis during a parallel polarization mode of operation and substantially perpendicular to the reference axis during a perpendicular polarization mode of operation. Multiple cameras may each capture an image of the face along a materially different optical axis and have a linear polarizer configured to polarize light traveling along its optical axis in a direction that is substantially parallel to the reference axis. A controller may cause each of the cameras to capture an image of the face while the lighting system is in the parallel polarization mode of operation and again while the lighting system is in the perpendicular polarization mode of operation.

The invention discloses a design method of a parallel polarization code BP decoder based on a formula language. The method comprises the following steps that a universal design formula F(N, M) is derived according to structural characteristics of a polarization code BP decoding algorithm factor graph, N and M represent the code length and the parallelism degree of a polarization code BP decoder respectively, and the design formula is cascading of formula symbols obtained according to hardware module mapping; function explanation is performed on all hardware module symbols in the design formulaF (N, M), and structure implementation is given out; an algorithm for determining a design formula F(N, M) is given, and the F (N, M) uniquely corresponding to the determined code length and parallelism degree are ensured; a processing process of the Python design platform is described, and the F (N, M) is mapped into a synthetizable hardware RTL description; and simulation verification of an EDAtool is performed 1on the hardware RTL description to obtain performance parameters of the BP decoder. The method can be suitable for the situation that the code length and the parallelism degree arechanged at will, the development efficiency and the design flexibility are improved, and parameterized configuration is carried out according to the requirements of a designer.

The invention discloses a microporous piezoelectric electret film assembly roll-to-roll continuous polarization device and method. The device comprises a coiling system, a plurality of polarization elements and a direct current high-voltage power supply, wherein the direct current high-voltage power supply is electrically connected with each polarization element, and the length direction and the width direction of each microporous piezoelectric electret film assembly are respectively defined to be the first direction and the second direction. The polarization elements are distributed into a plurality of polarization element bars, all polarization elements arranged on each row of polarization element bars are uniformly ranged in the second direction, The polarization element bars are mutually parallel, and are uniformly arranged in the first direction to form a parallel polarization element line, and the coiling system drives the microporous piezoelectric electret film assembly to pass through a position under the parallel polarization elements at a uniform speed, so that the microporous piezoelectric electret film assembly roll-to-roll continuous polarization is realized. The device provided by the invention has the advantages that the structure is simple, the efficiency is higher, and the device is suitable for mass production. The invention also provides the roll-to-roll continuous polarization method of the device.

The invention relates to a method and a device for detecting broadband microwave / infrared signals by beam splitting, belonging to the technical field of beam splitting detection and physical simulation of microwave / infrared bimodule signals. The method comprises the following steps of: reflecting microwave signals and transmitting infrared signals by utilizing a metal grid beam splitter to realize the beam splitting of microwave and infrared bimodule coupling signals, wherein the reflected microwave signals enter a microwave receiver for detection, and simultaneously the transmitted infrared signals enter an infrared detector for detection, thereby the beam-splitting detection of the microwave and infrared bimodule coupling signals is realized. The device comprises a metal grid beam splitter, an infrared detector and a microwave receiver, wherein the metal grid beam splitter comprises an infrared substrate, a metal chromium or titanium bonding layer and a metal grid film, the period of the metal grid film in a vertical polarization direction is greater than the period in a parallel polarization direction, and the periods in the vertical polarization direction and the parallel polarization direction are both 1 / 2 less than the smallest wavelength of microwave. The invention can be applied to the technical field of the beam splitting detection and the physical simulation of the microwave / infrared bimodule signals.

The invention discloses a phase-type polarization controller, which belongs to the field of optical fiber communication. The phase-type polarization controller comprises an input fiber, an output fiber and a drive circuit, and is characterized in that the phase-type polarization controller consists of three-stage continuous adjustable phase shifters in cascade, wherein the continuous adjustable phase shifter comprises two parallel polarization beam splitters having a birefringence fast axis and a birefringence slow axis in the same direction, and two total reflection prisms arranged on the same ends of the two polarization beam splitters in parallel; the inclined planes of the two total reflection prisms are parallel to the end faces of the two polarization beam splitter; and one total reflection prism is fixed on a piezoelectric ceramic. For the first-stage continuous adjustable phase shifter and the second-stage continuous adjustable phase shifter, the birefringence fast axis and the total reflection prism simultaneously rotate by 45 degree or 135 degree through taking the light beam as the shaft; and the birefringence fast axis and the total reflection prism of the third-stage continuous adjustable phase shifter have the same direction or rotate by 90 degree. The piezoelectric ceramics of the three-stage continuous adjustable phase shifters are controlled by the drive circuit to achieve the conversion from an arbitrary determined input polarization state to an arbitrary determined polarization state. The phase-type polarization controller has fast response and high accuracy.

The invention provides a polarized infrared spectrometer which consists of, at least, one infrared light source, one interferometer, one beam splitter, one sample testing accessory, one laser device, one laser detector, two polarizing films, two infrared detectors and spectrum sampling circuit systems matched with the two detectors. The spectrometer is characterized in that the light passing through the sample testing accessory is split into two same light beams, then the two light beams respectively pass through the polarizing films on respective light paths and then are detected by the detectors on the respective light paths to obtain interferograms, the interferograms are finally subjected to Fourier transform processing, and meanwhile a parallel polarization spectrum and a vertical polarization spectrum of a sample are obtained.

The invention relates to a non-metallic structure electromagnetic scaling design method, which comprises the following steps: S1, calculating complex reflection coefficients of theoretical scaling materials at different incidence angles under vertical and parallel polarization at scaling frequencies; s2, at the scaling frequency, establishing corresponding relations between different mixture formulas and electromagnetic parameters to obtain a scaling electromagnetic parameter library; s3, at the scaling frequency, circularly calculating the complex reflection coefficients of the simulated scaling material under vertical and parallel polarization at different incidence angles; s4, finding out a result most matched with the complex reflection coefficient of the theoretical scale material from all calculation results in the step S3 to obtain an electromagnetic parameter corresponding to the simulated scale material; and S5, designing the geometric shape of the non-metal structure scalingmodel to be consistent with that of the theoretical scaling model. The method is realized by optimizing and simulating electromagnetic parameters of the scaling material and enabling the electromagnetic parameters to be consistent with the complex reflection coefficient of the theoretical scaling material, breaks through the limitation of the scaling theory on the electromagnetic parameters of thescaling material, and is accurate and effective.

The invention relates to a fabrication method of a back incident high-reflection thin film system for a neodymium glass laser. The fabrication method comprises the steps of employing vertical polarization state S light as a working polarization state and employing a combined film system of an S light anti-reflection film matched with a corresponding angle and a back incident high-reflection film with regard to spectral characteristic required by formation of a resonant cavity of the neodymium glass laser; optimizing minimum standing wave electric field of the back incident high-reflection film in a thin film-substrate interface; and performing normalization on electric field distribution of the anti-reflection film and the back incident high-reflection film, changing the thickness of the anti-reflection film at the maximum standing wave electric field, and further improving a damage threshold. Compared with an existing scheme of parallel polarization state P light back incident high-reflection film, the fabrication method has the advantages of adjustable working angle, wider reflection band, higher laser damage threshold and better stability and error-tolerant rate.

The invention provides a polarization laser radar system with transmitting and receiving functions based on an optical rotator, and in the polarization laser radar system with transmitting and receiving functions, echo signal light obtained based on emergent signal light generated by a pulse laser comprises signal light in a parallel polarization state and signal light in a vertical polarization state. As the polarization beam splitter cannot reflect the signal light in the parallel polarization state, the polarization state of the echo signal light is adjusted by rotating the polarization plane of the echo signal light through the optical rotator, so that the optical rotator is in a working state and a non-working state respectively; all polarization states in echo signal light can be reflected to a signal detection and data processing system by the polarization beam splitter, so that the defect that the polarization beam splitter can only reflect signal light in one polarization direction is overcome; therefore, all polarization information of the polarized light in different directions in the echo signal light can be analyzed by the transmitting-receiving co-positioned polarized laser radar system, and the detection performance and the application range of the polarized laser radar are greatly expanded.

The invention discloses a device and method for generating an attosecond pulse by using a multi-color field and a nano-tip action. Laser devices, a reflector, a buncher, an electrostatic generation field, a nano tip and an aluminum foil are arranged. The light paths of polarized laser generated by the laser devices are adjusted by a reflector; the buncher adjusts the two beams of linear polarizedlight to be in a same propagation direction and polarization direction. The nano tip is arranged under two strong short laser pulses and an electrostatic field. Strong linearly polarized light generated by the laser devices acts with the metal nano tip to generate higher harmonics; and then the aluminum foil is used for screening effective frequency components to form a single attosecond pulse. According to the invention, two linearly polarized electrical fields with the parallel polarization directions in a parallel two-color state and one electrostatic field with the proper intensity are employed; and the nano tip is arranged in the fields to obtain higher harmonics including one super-continuous spectrum, so that a pure isolated attosecond pulse is obtained with the pulse width of 120 attoseconds.

The invention discloses a quantum key distribution network device and method of a master-slave structure. A master optical path of the quantum key distribution network device is composed of a single photon source, a polarization controller PC, an optical circulator, a coupler / beam splitter, a four-port optical polarization beam splitter / combiner, an optical switch and a quantum channel. A master control party and a slave control party of the network are connected through a quantum channel formed by an optical switch and an optical fiber, and an optical circulator reflection output end of the master control party and an output end of a coupler / beam splitter are respectively connected with a single-photon detector; one output light port of the coupler / beam splitter is connected with one phase controller to form an information loading part; two output ports of the coupler / beam splitter are respectively connected with two input ports of the optical switch to form a network control part; and the slave control party forms an information loading part by an attenuator, a phase modulator and a 90-degree rotating Faraday reflector which are sequentially connected with the quantum channel. Parallel polarization and vertical polarization of signal pulses are utilized to realize communication three-party quantum key distribution among different levels.

The invention discloses a pair of AR (Augmented Reality) glasses and an optical path for the AR glasses. The AR glasses comprise a display panel, and the optical path comprises a semi-transparent semi-reflective spectroscope arranged on the light path of image light emitted by the display panel, a polarization splitting curved surface semi-reflective mirror arranged on the light path of the reflected image light, and a reflective mirror arranged on the light path of the transmitted image light. The semi-transmitting and semi-reflecting spectroscope is used for dividing the image light into reflected image light and transmitted image light. The polarization beam splitting curved surface half-reflecting mirror is used for dividing the reflected image light into reflected propagated verticalpolarization image light and transmitted parallel polarization image light. The reflector is used for reflecting the transmission image light to the polarization splitting curved surface half-reflecting mirror. Thus, the optical path improves the utilization rate of the image light, so that the AR glasses can reduce the display brightness of the display panel and ensure the imaging quality of thedisplay panel, and the problems of high power consumption and high heat productivity of the display panel are solved.

The embodiment of the invention discloses a broadband beam synthesizer with a gradient-gradient dielectric constant. The broadband beam synthesizer comprises a gradient-gradient dielectric constant layer and an infrared reflecting layer, the air bubbles are doped in the dielectric constant gradient gradual change layer to change the dielectric constant, a dielectric constant Gaussian gradual change function is provided, the microwave transmittance of more than 80% at the frequency band of more than 10GHz is obtained, the technical effects of large microwave transmission bandwidth and high transmittance are realized, and the microwave transmission efficiency is improved. The problem that the beam synthesizer is required to have large bandwidth and high transmittance during simulation tests of tested equipment of different wavebands in a composite guidance semi-physical simulation test is solved. The microwave power transmittances of vertical polarization and parallel polarization of the beam synthesizer at an incidence angle of 45 degrees and a frequency band of more than 10GHz are both greater than 80%, further, the microwave transmittances reach 90% when the incidence angle is 0 degree and the frequency is greater than 10GHz, the technical effect that the surface type is not distorted is also realized, and the problem that the surface type deformation affects the infrared imaging quality is solved.

The present invention relates to an automatic welding filter that changes from a light transmission state to a dark transmission state in response to incident welding light and includes a color-tunable filter whose spectral transmittance can be varied to optimize the visual appearance of a welding task. The color-tunable filter comprises at least one low twist liquid crystal cell disposed between polarization filters having substantially parallel polarization directions. The user is able to adjust the color of the automatic welding filter in the dark transmission state, independently of the shade, in response to a user selected color signal which alters the birefringence properties of the low twist liquid crystal cell.