92results about How to "High phase shift accuracy" patented technology

The invention relates to a projection objective lens wave aberration detection device and method. Light emitted by a light source is uniformly radiated on a projection objective lens object plane, a scatter plate and a needle hole are installed on a masking stage, the needle hole is arranged on an object plane of a projection objective lens, the field of view is selected through the movement of the masking stage, a shearing grating is arranged on an image plane of the projection objective lens, the shearing grating is installed on a wafer stage together with a detector, the phase shifting function is realized through the transverse precise movement of the grating by the wafer stage, and simultaneously each frame of a shearing interference figure in the phase shifting process is recorded by utilizing the detector. Two-dimensional shearing is realized by utilizing the two-dimensional grating, the phase shifting function is integrated into the shearing interference instrument, and the high-precise measurement of the projection objective lens wave aberration is realized by adopting the characteristics of the phase space vector.

The invention belongs to a five-bit radio-frequency MEMS phase shifter in radio-frequency communication and MEMS technologies, comprising a CPW signal wire, an insulating layer, a grounding wire, an MEMS hole-plate metal beam, an elastic cantilever-type support, a proportional capacitor, a direct current (DC) bias electrode, an insulating layer, 31 MEMS switches consisting of bias leads, 5 DC loaded electrodes, connecting leads and a substrate with an insulating layer. The invention effectively overcomes the defect of phase-shifting malfunction of the MEMS metal beam due to self oscillation by adding the DC bias electrode, adopts the hole-plate metal beam and the elastic cantilever-type support to decrease a voltage to be pulled down by approximate 9V, not only realizes the small step of 11.25, 5-bit phase shifting and 32 phase-shifting states, but also has little reflection loss and high phase-shifting precision up to 3.5 and has the advantages of low insertion loss and pull-down voltage, small step amplitude, high bits, phase-shifting precision and reliability of the phase shifter, simpler machining process, matched use with a modern electronic communication system, and the like.

Systems and methods for remote detection of volcanic plumes using satellite signals. The invention solves the problem of remotely detecting volcanic plumes, including those embedded in clouds, by providing a system that can be installed onboard a mobile platform, such as an aircraft, a satellite, a weather balloon, a ship or a buoy. The volcanic plume detection system tracks RF signals (such as GPS signals from satellites) arriving at the mobile platform, and issues an alert or warning when characteristics of the RF signals indicate the likely presence of a volcanic plume in the monitored space. More specifically, the system in accordance with one embodiment utilizes the refractive properties of hydrogen sulfide (H₂S), a gas that is abundant in nearly all volcanic eruptions, to infer the presence of a volcanic plume.

The invention belongs to a five-bit X wave band phase shifter matched with an X wave band communication device for use. The five-bit X wave band phase shifter comprises a CPW (circular polarized wave) signal line rotatably arranged on a base plate and chamfering at exterior angles of corners, an insulating layer and CPW (coplanar waveguide) ground wires, an MEMS (micro-electromechanical systems) switch beam, a support plate, an upper polar plate and a lower polar plate of an MAM capacitor as well as an MEMS switch group consisting of components inside a supporting piece thereof. A connecting bridge, a bias electrode and an insulating layer are arranged between the CPW ground wires at the front and rear ends of the corners cross the CPW signal line. The positive electrode and the negative electrode of the bias electrode are connected with a lead. The base plate with the insulating layer is arranged on the upper surface. Compared with a conventional five-bit X wave band phase shifter, the five-bit X wave band phase shifter has the advantages that the area of the five-bit X wave band phase shifter provided by the invention is reduced by nearly 1/3, meanwhile the performance and the stability of the phase shift are improved. Therefore, the five-bit X wave band phase shifter is compact in structure, small in volume, high in strength and stability, low in insertion loss, large in Q value and high in phase shifting precision, and can be processed with high precision and large scale. Meanwhile, the packaging difficulty and the production cost in the production process are reduced and the like.

The invention discloses a grating self-tuning method based on the straight line phase in the three dimensional sweeping system, which relates to the reversion project, obtains four phase-shifts charts with the phase-shift method, then, carries on the straight line phase transition to the obtained four phase-shifts chart, carries on the two rides straight line fitting to the straight line phase obtain the fitting straight line phase, adjust the phase spot of deviate fitting straight line phase on the fitting straight line phase and obtain the adjustment phase spot, and then based the adjust phase spot, carry on the inverse transformation with the phase-shift method to obtain the new four phase-shifts chart, compared with the original four phase-shifts chart, obtain the transfer function between the projection diffraction grating and the gathering grating, and take the transfer function as the adjustment optimization function, adjust the computer production diffraction grating, realized the self-tuning of the grating. The method effectively improved the projection grating profile sine and the precise phase-shift, can enhance the grating profile robustness, also can increase the phase-shift precision, and then enhance the system measuring accuracy.

The invention discloses a six-bit digital phase shifter comprising a 5.625-degree phase shift circuit, a 11.25-degree phase shift circuit, a 22.5-degree phase shift circuit, a 45-degree phase shift circuit, a 90-degree phase shift circuit and a 180-degree phase shift circuit, wherein the 5.625-degree phase shift circuit, the 11.25-degree phase shift circuit, the 22.5-degree phase shift circuit andthe 45-degree phase shift circuit are cascaded between the 90-degree phase shift circuit and 180-degree phase shift circuit in any sequence. The higher phase shift circuits of the phase shifter are used as the output and the output of the phase shifter, thereby being able to not only improve the matching ability of the polarities of the phase shifter, but not effectively improve the phase shift precision.

The invention discloses an ultra wide band high-linearity active phase shifter. The ultra wide band high-linearity active phase shifter comprises a Lange coupler, ultra wide band amplifiers, a vector synthesis amplifier, an active Balun and a digital analog converter. The ultra wide band high-linearity active phase shifter is characterized in that a radio frequency signal is inputted into the Lange coupler, the Lange coupler generates an I-route signal and a Q-route signal, the wide band of the I-route signal and the wide band of the Q-route signal are orthogonal, the I-route signal and the Q-route signal are outputted into the I-route ultra wide band amplifier and the Q-route ultra wide band amplifier respectively, the I-route ultra wide band amplifier and the Q-route ultra wide band amplifier amplify the I-route signal outputted by the Lange coupler and the Q-route signal outputted by the Lange coupler respectively to generate four routes of orthogonal signals with the equal amplitude, and the four routes of orthogonal signals with the equal amplitude are outputted to the vector synthesis amplifier, the vector synthesis amplifier receives a phase and amplitude control signal outputted by the digital analog converter and a quadrant selection control signal outputted by the digital analog converter, conducts signal synthesis, phase selection and quadrant selection on the four routes of orthogonal signals which have the equal amplitude and are outputted by the I-route ultra wide band amplifier and the Q-route ultra wide band amplifier, and then outputs an I-route phase shifting signal and a Q-route phase shifting signal to the active Balun, and the active Balun conducts impedance matching on the phase shifting signals and outputs the phase shifting signals.

The invention discloses an adjustable optical phase shifter and the phase shifting process, which is made up of two acousto-optic modulators, radio frequency power amplifier and sine signal generator, the output end wire of the generator, one wire is connected to the input end of the radio frequency power amplifier, another wire is connected to the a electron phase shifter in series and then connected to the input end of another radio frequency power amplifier. The phase shifting process, the incoming ray enters the acousto-optic modulator 1, the sine wave signal generator transmits radio frequency signal with the same frequency to the radio frequency power amplifier and the electro phase shifter, adjusts and controls the electron phase shifter, the two acousto-optic modulators are driven by the radio frequency signal with the same frequency and different phase; the acousto-optic modulator generates the first grade diffraction as the incoming ray of the acousto-optic modulator the diffraction of the modulator is used as the output light, the output light has the same frequency to the incoming ray and the phase can be shifted. The merits of the invention are: it needs no phase shift label, and it can generate dynamic adjustable optical phase shift.

The invention discloses a rail traffic axle counting system based on FPGA phase detection. The rail traffic axle counting system comprises a first wheel sensor arranged on one side of a rail and a second wheel sensor arranged on the other side of the rail, the first wheel sensor and the second wheel sensor are connected with a control room through axle counting equipment, and the axle counting equipment comprises a first FPGA, a first conditioning circuit, a second FPGA and a second conditioning circuit. The first FPGA generates a pulse signal with the frequency f1 and sends the pulse signal to the first wheel sensor through the first conditioning circuit, and a signal returned by the first wheel sensor is connected to the first FPGA through the first conditioning circuit to be subjected to data processing. The second FPGA generates a pulse signal with the frequency f2 and sends the pulse signal to the second wheel sensor through the second conditioning circuit, and a signal returned by the second wheel sensor is connected to the second FPGA through the second conditioning circuit to be subjected to data processing. The first FPGA and the second FPGA sends the counting results to the control room. The debugging efficiency is improved, and the rail traffic axle counting system is suitable for a train travelling at a high speed.

The invention discloses a microwave and millimeter wave wideband 5bit singlechip integrated digital phase shifter. The phase shifter is formed by the cascade of 11.25-degree, 22.5-degree, 45-degree, 90-degree and 180-degree phase shift circuits; high/low-pass filter topology is adopted in a 11.25-degree/22.5-degree phase shift position; reflective topology design is adopted in 45-degree/ 90-degree/ 180-degree phase shift position; and the phase shifter totally can realize 32 phase shift states in a phase shift stepping value range of 0 to 360 degrees, the finally layout is arranged by the phase shifts from big to small, and the working frequency band of the phase shifter is 6 to 18GHz. The phase shifter has simple circuit topology and design process, simple manufacturing process, high yield, small chip area, wide working frequency band, low insertion loss, high phase shift precision, low input and outlet voltage standing wave ratio and small insertion loss difference of the phase shift states.

This invention relates to a method for realizing accurate phase shift by a ferrite shifter, which applies a numerical control mode combining a flux excitation and a saturated digital excitation to make the shifter to generate accurate shift including: dividing a ferrite loaded on a waveguide center along the direction of the waves into n sections and the n is greater or equals to 2, the first section of which applies a flux excitation mode, the rest n-1 sections apply a saturation digital mode then overlapping the shift values of them and the shifter carries out digital control shift according to the step volume of the flux excitation section in the sphere greater or equals to 360deg.

The invention discloses a broadband multilayer microstrip Butler beamforming network matrix device, and belongs to the technical field of electronic communication in order to solve the defects, such as a narrow operating frequency, a large port phase shift error, and poor port amplitude flatness, of a current Butler matrix. The broadband multilayer microstrip Butler beamforming network matrix device is easy to manufacture, low in cost, high in port phase shift accuracy, small in port amplitude fluctuation, low in loss, wide in operating frequency and high in port isolation degree, can meet therequirements of modern civilian mobile communication systems and military radar systems for new-generation multi-beam array antennas and antenna testing.

A digital three-phase shifting triggering IC contains three comparator circuits, a debouncing circuit, three phase shifting circuits, three pulse width generating circuits, three output driving circuits and a open-phase protection circuit. Said invention adopts digital control method to control accuracy shift triggering of thyristor and raises phase shifting precision and symmetry degree, circuit stability and reliability, and reduces products complexity and separation degree.

The invention discloses an improved switch line type phase shifter. Three improved switch phase shifting structures are provided for the problems of high insertion loss and low phase shifting precision of an existing switch line type phase shifter, a PIN diode switch and a microstrip line branch connector in the existing switch line type phase shifter are subjected to structure optimization to achieve the purposes of insertion loss of the phase shifter and improve the phase shifting precision and power capacity. The phase shift stability and precision are high, the phase shift quantity is notchanged along with a signal level; and the insertion loss is small, the port standing wave is small, the phase shifting speed is fast, and the required control power is small. The improved switch linetype phase shifter is an important component of a phased array antenna transmitting/receiving component, and the phase of each radiating unit on the aperture surface of the antenna is electrically controlled so as to achieve beam scanning.

The invention discloses a micro electronic mechanical system (MEMS) load line type 2-bit phase shifter based on a left-handed transmission line, and particularly relates to an MEMS load line type 2-bit phase shifter in order to solve the problems of small phase shift amount and large switching quantity of MEMS switches in the 2-bit phase shifter. A microstrip line comprises a ground plate, a base and a signal wire, wherein a metal layer is covered on the ground plate; the signal wire is fixed on the upper surface of the base and positioned at a middle position of the base along the width direction, and is divided into four sections, and each two adjacent sections are electrically connected with each other through a phase-shifting unit; the phase-shifting unit comprises stub lines, an interdigital capacitor, MEMS switches and a cylindrical metal through hole; and a stub line and an MEMS switch are arranged at two ends of the interdigital capacitor respectively, one end of the stub line is connected with the center of one end of the interdigital capacitor, and a cube contact point is arranged in the middle of the lower surface of a bridge of the MEMS switch and is suspended above the stub line. The MEMS load line type 2-bit phase shifter is used for controlling phase changes of signals.

The invention discloses a hybrid MEMS phase shifter, so as to solve problems of large phase shifter chip area, poor phase shift precision and low process tolerance in the prior art. The hybrid MEMS phase shifter comprises a base, a microstrip transmission line grounding line arranged at the bottom part of the base, a phase delay network, a phase reference network, and power distributors for being connected with the phase delay network and the phase reference network, wherein the power distributors are connected with the phase delay network and the phase reference network via single-pole single-throw switches or single-pole double-throw switches; each of the phase delay network and the phase reference network is composed of one or more MEMS variable capacitors and two connection transmission lines connected with two sides of the MEMS variable capacitors respectively and connected with parallel-type MEMS switches, and the single-pole single-throw switches or single-pole double-throw switches are the parallel-type MEMS switches. The switched-line phase shifter and the distributed phase delay network structure are combined, and advantages that the reference network and the delay network have high isolation, and phase shift is simulated and adjustable in a small range.

This invention discloses a method for precisely shifting phases and a phase-shifter, first of all, which cuts a HF input signal in a counter, which outputs a low frequency square wave signal to be shifted, secondly outputs a two double frequency square wave signal of the being shifted signal, thirdly switches the HF input signal and the two double frequency square wave signal in a preset counter to output a phase-shift square wave labeling square wave and fourthly switches the shift labeling square wave and the low frequency signal to be shifted in a trigger to output the shifted low frequency square wave to finish the phase shift. Device realizing said method include a counter and preset counter and a trigger.

The invention discloses a hybrid broadband high-precision phase shifter integrated circuit, which belongs to the technical field of radio frequency integrated circuits, and is formed by cascading a pi-type L-C phase shift unit, a 22.5-degree switch-type phase shift unit, a 45-degree switch-type phase shift unit, a broadband quadrature signal generator, a quadrant selection unit and a transformer.The pi-type L-C phase shift unit is used for realizing 5.625-degree and 11.25-degree phase shift states; the two switch type phase shift units respectively realize 22.5-degree and 45-degree phase shift states, the quadrature signal generator is used for synthesizing a pair of quadrature differential signals, and the quadrant selection unit switches the positive and negative polarities of the quadrature signals through a switch to realize a 360-degree phase shift range. Compared with a traditional switch type phase shifter, the hybrid phase shifter has the advantages of being wide in band, lowin insertion loss, high in precision and the like.

The invention provides a particle playground measuring device and a measuring method based on digital micro-mirror plane structured light illumination. The particle playground measuring device is characterized in that parallel light after collimation and beam expanding is reflected by a digital one-dimensional periodic optical grating generated by a DMD (digital mirror device) and forms plane structured light to illuminate a particle playground by sequentially passing through a first cylindrical lens, a filter and a second cylindrical lens, and finally the light is scattered by the particle playground and collected by an image sensor to form an imaging pattern; the DMD and the image sensor are synchronously triggered and controlled by adopting a computer to control a synchronous controller, the digital one-dimensional periodical optical grating is controlled by the DMD to generate the phase shift of 0, 2pi/3 and 4pi/3, three patterns with the phase shift of 0, 2pi/3 and 4pi/3 are sequentially collected through the image sensor, the collected interference pattern is processed by the computer, and the phase distribution of a to-be-detected object can be acquired. The method and the device have the characteristics of high response speed, stability in phase shift, convenience in use and the like.

One embodiment of the invention discloses a broadband six-bit MMIC numerical control phase shifter. The phase shifter comprises a 5.625-degree phase shifting unit, a 11.25-degree phase shifting unit, a 22.5-degree phase shifting unit, a 45-degree phase shifting unit, a 90-degree phase shifting unit and a 180-degree phase shifting unit. The 5.625-degree phase shift unit adopts a series inductance parallel switch structure; the 11.25-degree phase shift unit, the 22.5-degree phase shift unit and the 45-degree phase shift unit adopt T-shaped phase shifter structures; the 90-degree phase shift unit adopts a reflection type structure composed of a Lange coupler and a reflection terminal; and the 180-degree phase shift unit adopts a structure of a balanced-unbalanced converter and a single-pole double-throw switch.