570results about "Turn-sensitive devices" patented technology

Microelectromechanical component (100) for motion measurement, comprising: a fortified section (118); a single, central anchor (106) coupled to the attached section (118) with four sides; a first non-straight suspension element (108) coupled to the anchor (106) on one side of the anchor (106); a second non-straight suspension member (120) coupled to the anchor (106) on the same side of the anchor (106), wherein the second non-straight suspension member (120) has a shape and position that mirrors the first non-straight suspension member (108) on a plane (122) bisecting the anchor; and a test mass (104) which is planar, wherein the test mass (104) is suspended at least partially on the first non-straight suspension member (108) and the second non-straight suspension member (120) such that the test mass (104) is rotatable about the anchor (106) and displaceable in a plane which is parallel to the attached section (118), where the first and second non-straight suspension members (108, 120) are bending bearings, wherein the first non-straight suspension member (108) has a C-shape, wherein the C-shape includes an inner section (110) which is coupled to the anchor (106) and extends towards the plane (122) bisecting the anchor, a central section (114) which includes a nearby section and has a distant section, whereby the near section is coupled to the inner section (110), and the far section extends away from the anchor (106) along the plane (122) bisecting the anchor and is coupled to an outer section (112) extending away from the plane (122) bisecting the anchor.

The invention belongs to the technical field of precision measurement, and discloses a heating, excitation and frequency cracking measurement method for a quartz hemispherical harmonic oscillator, which adopts an infrared light source to uniformly heat the quartz hemispherical harmonic oscillator, and performs excitation through a piezoelectric excitation sheet based on a'four-antinode 'vibration mode of the quartz hemispherical harmonic oscillator. The method comprises the following steps: reading a vibration signal through a laser vibration meter, analyzing the direction of a frequency splitting decomposition and stiffness non-uniform axis of the quartz hemispherical harmonic oscillator, performing etching de-weighting through an ion beam, and trimming the stiffness non-uniformity of the quartz hemispherical harmonic oscillator. According to the method, the problem that the circumferential rigidity of the quartz hemispherical resonator is not uniform is solved, and compared with the conventional harmonic oscillator frequency cracking trimming method, the harmonic oscillator frequency cracking is leveled from the rigidity trimming angle, so that the temperature change interference resistance characteristic of the frequency cracking after trimming of the quartz hemispherical resonator gyroscope is improved.

Solid-state platforms based on electro-nuclear spin systems are attractive candidates for rotation sensing due to their excellent sensitivity, stability, and compact size, compatible with industrial applications. Conventional spin-based gyroscopes measure the accumulated phase of a nuclear spin superposition state to extract the rotation rate and thus suffer from spin dephasing. A gyroscope protocol based on a two-spin system that includes a spin intrinsically tied to the host material, while the other spin is isolated. The rotation rate is then extracted by measuring the relative rotation angle between the two spins starting from their population states, robust against spin dephasing. In particular, the relative rotation rate between the two spins can be enhanced by their hyperfine coupling by more than an order of magnitude, further boosting the achievable sensitivity.

An oscillation apparatus includes: an oscillator including a resonator and a magnetic-field generation unit, the resonator including a loop circuit and a capacitor, the loop circuit including a first superconducting line, a first Josephson junction, a second superconducting line, and a second Josephson junction connected in a ring shape, the magnetic-field generation unit being configured to apply a magnetic field to the loop circuit, and the oscillator being configured to perform parametric oscillation; a read-out unit for reading out an internal state of the oscillator; and a circuit component in which a coupling strength between the oscillator and the read-out unit is variable. The oscillator is connected to the read-out unit through the circuit component.

Various optical systems for use in a light pulse atomic interferometer (LPAI)-based one-, two-, or three-axis accelerometer or gyroscope are disclosed. As an LPAI accelerometer or gyroscope may employ many different laser beams to implement the LPAI functionality, ways of combining these different laser beams to thereby simplify the optical systems are desired. The cooling laser beam portion of the optical system may be simplified using one or more reflective grating chips. The Raman laser beam optics may be simplified using combiners and separators. For LPAI systems sensing along three axes, various optical switching schemes may be employed, including ones that generate variable data-rates with a primary sensing axis having a higher data-rate than the secondary sensing axes. Further, by combining various laser beams in a time-multiplexed manner, the number of optical fiber tethers to a sensor head may be reduced.

An adjuster performs simultaneous irradiation of M laser beams to an atomic beam, where M is a predetermined integer satisfying 3≤M. The course of each of the M laser beams intersects with the course of the atomic beam. A component, in a direction perpendicular to the course of the atomic beam, of the sum of radiation pressure vectors that the M laser beams respectively have is zero. A component, in a direction of the course of the atomic beam, of the sum of the radiation pressure vectors that the M laser beams respectively have is negative for atoms having speeds greater than a predetermined speed, and positive for atoms having speeds smaller than the predetermined speed.

The utility model discloses a preparation and filling system of an optical fiber bubble cavity alkali metal gas chamber, which comprises a sealing chamber, a carbon dioxide laser, a first displacement platform, a second displacement platform, an ultraviolet laser, an alkali metal simple substance, a vacuumizing device, an upper computer and a first gas cylinder filled with inert gas, the carbon dioxide laser, the first displacement platform, the second displacement platform, the ultraviolet laser and the alkali metal elementary substance are all arranged in the sealed cavity, and the vacuumizing device, the first gas cylinder and the upper computer are all arranged outside the sealed cavity; the vacuumizing device and the first gas cylinder are communicated to the sealed cavity, and the upper computer is connected with and controls the carbon dioxide laser, the first displacement platform, the second displacement platform and the ultraviolet laser. The preparation and filling system is used for preparing and filling the alkali metal air chamber of the optical fiber bubble cavity.

The invention provides a hemispherical resonator gyroscope angle control voltage coefficient calibration method, which comprises the following steps: driving a gyroscope standing wave azimuth angle to rotate by using a fixed angle control voltage, and obtaining a gyroscope output angular rate; modeling the angular rate error of the gyroscope in the driving process by using a least square method, and compensating the angular rate of the gyroscope; and according to the compensated angular rate of the gyroscope, estimating the change parameter of the angular rate along with the voltage by adopting a Kalman filtering algorithm, and completing the calibration of the angle control voltage coefficient. Fixed angle control voltage is used for driving the standing wave azimuth angle of the gyroscope to rotate, modeling is carried out according to the change of the angular rate along with the standing wave azimuth angle, and the change part of the angular rate is compensated, so that the output angular rate and the control voltage are in a linear relation; and then designing a Kalman filter, and estimating the change parameter of the angular rate along with the voltage by utilizing controllable voltage input and the calculated angular rate of the gyroscope. The output accuracy and stability of the hemispherical resonator gyroscope are improved.

The invention belongs to the field of inertial navigation measurement, and discloses a nuclear magnetic resonance gyroscope main magnetic field control method and system based on active disturbance rejection control, and the method comprises the following steps: establishing a nuclear magnetic resonance gyroscope main magnetic field system differential equation; designing an active-disturbance-rejection controller based on a differential equation of a main magnetic field system of the nuclear magnetic resonance gyroscope; based on an active-disturbance-rejection controller, a nuclear magnetic closed-loop system is built in combination with a gyro prototype, and main magnetic field disturbance is restrained. The invention particularly provides a magnetic field control method based on linear active disturbance rejection control (LADRC) aiming at the key influence of the stability of a main magnetic field in a nuclear magnetic resonance gyroscope on the system output precision, which is used for solving the problems of insufficient control precision and poor robustness in the face of system disturbance, model uncertainty and nonlinear environment influence of the existing PID control method. Therefore, the zero-bias stability and the measurement precision of the nuclear magnetic resonance gyroscope are improved.

An optical frequency generation system (100), comprising: - reference atoms (7) in a gas phase, - an interrogation laser source (1) configured to emit an interrogation signal (101) comprising a first optical frequency suitable for exciting a two-photon transition in said reference atoms (7), said interrogation signal (101) being configured to interact with said reference atoms (7) in a Doppler-free scheme; - optical frequency modulation means (31, 31a, 31b) configured to adjust said first optical frequency and to modulate said first optical frequency at a first modulation frequency f1; - an optical sensor (9) configured to detect a fluorescence signal (110) from said reference atoms (7); - a first control loop (10) configured to lock said first optical frequency to a resonance frequency of said two-photon transition, said fluorescence signal (110) being input into the first control loop (10); - a mitigation laser source (2) configured to emit a mitigation signal (102) comprising a second optical frequency selected to produce a light-shift of said two-photon transition of opposite sign of the light-shift produced by the interrogation signal (101); characterized in that the optical frequency generation system (100) further comprises: - optical amplitude modulation means (5) configured to modulate the amplitude of the interrogation signal (101) and of the mitigation signal (102) at a second modulation frequency f2, and - a second control loop (20) configured to adjust the relative amplitude of the mitigation signal (102) with respect to the interrogation signal (101) such as to cancel the effective light-shift of the combined interrogation (101) and mitigation (102) signals.

The invention relates to a hemispherical resonator and hemispherical gyroscope parameter and defect identification system and method, and belongs to the technical field of hemispherical resonator gyroscopes. According to the invention, automatic identification of damping non-uniformity, rigidity non-uniformity and 1-3-order quality defect parameters is respectively carried out on the fused quartz hemispherical resonator before and after film coating and the gyroscope header after base assembly, so that the full-flow coverage test of the hemispherical resonator gyroscope is realized; various parameters are identified in the whole process from harmonic oscillator machining forming to the gauge outfit state, the testing precision, the system reusability, the operation convenience and consistency are greatly improved, and the production efficiency is improved.

A three-axis angular rate sensor with a substrate and a A double rotor is proposed, wherein the double rotor has a first and a second rotor (1, 2) which are elastically connected to one another via a first coupling element (8) in such a way that the two rotors (1, 2) can be excited to antiphase torsional vibrations, wherein the first rotor (1) has a first and a second second seismic mass (3, 4) which are mounted so as to be deflectable relative to the first rotor (1) and the second rotor (2) has a third and a fourth seismic mass (5, 6) which are mounted so as to be deflectable relative to the second rotor (2), wherein the first mass (3) is connected to the third mass (5) via a first rocker element (9) is connected in such a way that the third mass (5) at a lateral deflection of the first mass (3) is deflected in an opposite lateral direction, wherein the second mass (4) is connected to the fourth mass (6) via a second rocker element (9') such that the fourth mass (6) is deflected in an opposite lateral direction upon a lateral deflection of the second mass (4).

The invention discloses an SERF atomic gyro signal detection device and method based on an optical heterodyne method, and belongs to the technical field of atomic polarization stability control, after magnetic fields with x-axis frequency and y-axis frequency are applied to atoms in a sensitive unit air chamber, x-axis electron polarizability information under respective modulation frequencies comprises longitudinal polarizability information and longitudinal magnetic field information, and x-axis electron polarizability information and y-axis electron polarizability information under respective modulation frequencies comprise longitudinal polarizability information and longitudinal magnetic field information; the value of the longitudinal polarizability is obtained by resolving information contained in the two, and effective longitudinal polarizability closed-loop control is achieved through a liquid crystal phase delayer power stabilizing rate system. Based on the biaxial magnetic field modulation technology, interference of longitudinal magnetic field fluctuation on polarizability closed-loop control is effectively avoided, and effective polarizability in-situ closed-loop control is achieved.

The utility model relates to a glass atomic air chamber which comprises a square air chamber framework which is made of a glass tube, the outer wall of the glass tube is cut after being subjected to four-side grinding, a cylindrical inner cavity is formed in the square air chamber framework, and a filling hole communicated with the inner cavity is formed in one outer wall face of the square air chamber framework. The glass tube is adopted as a raw material, the outer wall of the glass tube is cut to form the square air chamber framework after being subjected to four-side grinding, the degree of finish of the circular inner cavity of the glass tube is high, inner cavity polishing treatment does not need to be carried out, the perpendicularity of the formed adjacent faces and the parallelism of the formed opposite faces are high, and the light window glass sheets are bonded to the two end faces of the square air chamber framework. The formed optical window is high in light transmittance, the two end faces of the square air chamber framework are polished, the perpendicularity and parallelism of the two end faces are improved, the perpendicularity and parallelism of the bonded optical window glass are high, and the formed optical window is high in light transmittance.

A compact grating-mirror magneto-optical trap (GMOT) cold atom inertial sensor head is disclosed. To make the sensor head compatible with the high vibration levels encountered in dynamic environments, the number of optical ports in the vacuum chamber is minimized and various components, including fixed optical components and a reflective grating chip, are hard mounted within the vacuum chamber. The use of the reflective grating chip reduces the number of optical ports required for cooling beams from six to one. The number of optical ports is further reduced by time multiplexing multiple beams passing through a given optical port.

The invention relates to an SERF gyroscope pump light direction residual magnetic field measurement method, which is characterized in that pump light is respectively adjusted to left-hand circular polarization and right-hand circular polarization in an SERF gyroscope system to perform pump polarization, and the characteristic that the light displacement is equal in size and opposite in direction and the residual magnetic field is kept unchanged in two states is utilized to measure the residual magnetic field in the SERF gyroscope pump light direction. The total magnetic fields obtained by testing in the two states are combined to calculate and eliminate optical displacement, so that the measurement of the residual magnetic field is realized. According to the invention, in-situ measurement of the residual magnetic field in the pumping light direction can be realized without adding a device or changing the system light path in the system light path, the operation in the test process is relatively simple, and the measurement result is relatively reliable.

The invention provides a synchronous closed-loop control method for detecting laser light intensity and frequency by a nuclear magnetic resonance gyroscope, which comprises the following steps of: firstly, detecting laser detection power fluctuation by utilizing a splitting part of a beam splitter prism, and realizing closed-loop stable control on the detection laser power by adjusting injection current of a detection laser tube; secondly, a detection power signal absorbed by the air chamber is extracted through a summation signal of the polarization balance beam splitting detection system, the signal reflects fluctuation of the detection laser frequency, and finally synchronous closed-loop stable control over the detection laser frequency is achieved by adjusting the temperature of a detection laser tube with the signal as a closed-loop feedback signal. The synchronous closed-loop stable control of the nuclear magnetic resonance gyroscope detection laser power and frequency can be realized, the nuclear magnetic resonance gyroscope output signal drift caused by the fluctuation of the detection laser power and frequency is inhibited, and the long-term stability of the gyroscope output signal is improved. By applying the technical scheme provided by the invention, the technical problem that the miniaturization requirement of the nuclear magnetic resonance gyroscope is difficult to meet in the prior art is solved.

A vibration-type angular velocity sensor (100) includes a primary side control circuit (2) and a secondary side control circuit (3) which are configured so that a function as the primary side control circuit (2) and a function as the secondary side control circuit (3) are interchangeable, in which an offset value after interchange and an offset value before interchange are symmetric values with respect to a predetermined reference value.

The invention relates to the technical field of MEMS, and discloses an MEMS gyroscope closed-loop driving loop, a phase-locked loop circuit outputs a synchronous clock signal, and a clock generation circuit is used for performing gate logic operation, frequency division and layered delay addition on the synchronous clock signal to generate multiple groups of collaborative non-overlapping clock signals; a band-pass delta-sigma modulator, a CV conversion circuit and a digital signal processing module are controlled; meanwhile, through phase locking of a synchronous clock phase, a main sampling switch signal is synchronized with a falling edge of the synchronous clock phase, and the sampling phase is ensured to be 0 degree, so that a digital code stream signal of which the sampling phase is kept at 0 degree is output, and the sampling phase of the band-pass delta-sigma modulator is strictly synchronized with the mechanical vibration phase of the MEMS gyroscope; and phase deviation in the driving loop is eliminated. The digital signal processing module adjusts the amplitude and the phase of a feedback signal of the whole driving loop, so that the stability and the adjustability of the driving loop are improved under the condition that the MEMS gyroscope is driven under a proper condition.

The invention discloses a holosymmetric four-mass MEMS gyroscope which comprises four sensitive mass block coupling structures which are arranged in a central symmetry manner, and four first U-shaped beams, four n-shaped beams and a cross-shaped coupling structure which are arranged in a central symmetry manner and are connected with the four sensitive mass block coupling structures, compared with the prior art, the four sensitive mass block coupling structures are designed compactly and symmetrically, so that the sensitivity can be effectively improved, and thermally induced drift can be effectively reduced. The driving mode and the working mode are separated through the specific coupling mechanism, so that frequency coupling is avoided, and environmental vibration interference is reduced. And meanwhile, the symmetry of the structure is beneficial to uniform distribution of thermal stress or mechanical stress, so that zero drift caused by temperature change is inhibited.

The invention discloses a high-integration micro-mechanical accelerometer-gyroscope, and belongs to the technical field of inertial sensing. According to the invention, by sharing a mechanical structure and an electrode, applying a pair of direct-current voltage, resonance voltage and carrier voltage with opposite symbols on a symmetrical parallel-plate capacitor structure, and combining a PLL phase closed-loop control method, resonance driving, amplitude detection and frequency detection of a three-axis structure can be realized at the same time; force balance feedback voltage can be obtained through weighted fusion and controller calculation, the position of the mass block is kept constant, and at the moment, the feedback voltage reflects the acceleration; meanwhile, the three-axis resonant structure is subjected to the coriolis force coupling effect, the sum of the resonant frequencies of the two orthogonal axes comprises angular velocity information of the third orthogonal axis, and the angular velocity can be obtained through multiplication demodulation and low-pass filtering calculation with a sinusoidal signal with the frequency being the difference between the two frequencies. The micro-mechanical accelerometer-gyroscope integration method is simple, and temperature drift can be effectively inhibited at the same time.

The invention relates to a calibration method for X / Y channel phase delay errors of an all-angle hemispherical resonator gyroscope, and belongs to the technical field of inertial device error calibration, and the calibration method comprises the following steps: S1, based on an average method, establishing an all-angle hemispherical resonator gyroscope nonlinear error model containing the X / Y channel phase delay errors; s2, performing parameter calibration on the all-angle hemispherical gyroscope nonlinear error model containing the X / Y channel phase delay error based on a moving phase to obtain a calibrated X / Y channel phase delay error; and S3, compensating the output of the full-angle hemispherical resonator gyroscope by using the calibrated X / Y channel phase delay error. The parameter identification work can be carried out offline, the problem of calculation of a large amount of real-time data is avoided, the calibration result is high in reliability, high in universality and simple to operate, the full-angle hemispherical resonator gyroscope is high in precision and good in practicability after compensation, and the problems that in the prior art, the calibration result is not reliable, and the precision is poor after compensation are solved.

A gyroscopic sensor system can include a proof mass, which can be configured to vibrate in a first primary mode and a second primary mode, where the first primary mode can be driven into resonance, where an in-phase signal can be induced in the second primary mode in response to a rotation of the gyroscopic sensor system. The gyroscopic sensor system can also include a quadrature force circuit, which can be configured to force the second primary mode of the proof mass. The gyroscopic sensor system can also include control circuitry, which can be configured to drive the quadrature force circuit using a quadrature test signal which can be configured to generate a quadrature response in the proof mass that can be in quadrature with the in-phase signal. The control circuitry can also be configured to measure the quadrature response of the proof mass to the quadrature test signal.

The invention belongs to the field of closed-loop control of resonant ring micro-electro-mechanical gyroscopes, and particularly relates to a time-sharing digital control system of a resonant ring micro-electro-mechanical gyroscope. Comprising a resonant ring micro-electro-mechanical gyroscope, two modal driving / detection electrode time-sharing switching modules, two modal detection modules, two analog-to-digital converters, three digital-to-analog converters, three single-ended to differential driving modules and a digital processing unit, and the digital processing unit generates driving / detection time-sharing control signals S1 and S2. Performing digital demodulation, filtering, control resolving, direct digital frequency generation and modulation processing on the first modal detection signal to realize time-sharing stable tracking closed-loop control of the resonant frequency of the gyroscope and time-sharing stable closed-loop control of the vibration amplitude; digital demodulation, filtering, control resolving and modulation processing are carried out on the second modal detection signal, and stable control over gyroscope orthogonal compensation and time-sharing stable closed-loop control over the gyroscope angular rate are achieved.

The invention belongs to the technical field of alkali metal atom gas chambers, and particularly relates to a method for precisely filling mixed alkali metal atoms in an atom gas chamber, which comprises a theoretical method for precisely filling and quantitatively detecting the mixed alkali metal atoms, a technical method for precisely acquiring the mixed alkali metal atoms and a precise filling technology based on a temperature gradient method. The method is combined with an in-situ quantitative detection technology based on a differential scanning calorimetry, so that high-precision regulation and control and real-time verification of the content of the mixed alkali metal atoms in the gas chamber can be realized. The method is simple and convenient in process and high in filling efficiency, ensures accurate control of the atomic weight of the alkali metal in the air chamber, effectively improves the performance of the air chamber, and further optimizes the overall performance and the measurement precision of the SERF atom gyroscope.

The invention provides a decoupling phase closed-loop locking nuclear magnetic resonance gyroscope, and particularly relates to a nuclear magnetic resonance gyroscope based on modulation and demodulation of an alternating current reference line magnetic field, which is characterized in that an alternating current reference modulation magnetic field different from nuclear spin resonance frequency is applied along the direction of detection light; meanwhile, alternating current modulation is conducted on the decoupling phase of the nuclear magnetic resonance gyroscope electron paramagnetic resonance magnetometer, alternating current reference modulation amplitude changes are demodulated, a decoupling phase error signal is obtained, and real-time closed-loop locking of the decoupling phase is achieved through a closed-loop control system based on the error signal. According to the invention, real-time closed-loop locking of the decoupling phase of the nuclear magnetic resonance gyroscope can be realized, and decoupling phase fluctuation caused by fluctuation of system parameters such as laser power, frequency and air chamber temperature is inhibited, so that the angular rate measurement precision and long-term stability of the nuclear magnetic resonance gyroscope are improved. According to the technical scheme, the technical problems that in the prior art, a double-shaft differential detection method is prone to being affected by amplitude fluctuation, large errors exist, and operation is complex are solved.

The application belongs to the field of optical precision manufacturing, and relates to a bottom-up atomic gas chamber manufacturing device and manufacturing method. The device is composed of a vacuum cavity, a pumping pipeline, a gas inlet pipeline, a discharge electrode plate set, an insulating support, a gas chamber, a laser, an alkali metal source and a vacuum gauge. The device is used for manufacturing the atomic gas chamber from bottom to top, and can be used for preparing various gas chambers with different gas pressure ratio requirements, thereby helping to realize customized preparation. The device reduces the disadvantages of impurity adsorption on the inner wall of the gas chamber and reduces uncontrollable risks. The device has high integration, high preparation efficiency and large secondary development space, and is favorable for accelerating the technical iteration of the atomic gas chamber and the cross-generation development of key technologies such as nuclear magnetic resonance gyroscopes, atomic clocks and magnetometers.

The present disclosure is directed to a device configured to detect whether the device is in a bag or outside of the bag. The device determines whether the device is in or outside of the bag based on distance measurements generated by at least one proximity sensor and motion measurements generated by at least one motion sensor. By using both distance measurements and motion measurements, the device is able to detect whether the device is in the bag or outside of the bag with high accuracy and robustness.

A high-temperature tank (116) includes an optical window which transmits a laser (132) and is provided at one end, and a right-angle conical mirror (102) which is provided at the other end, has an opening (106) at the apex and which reflects laser light (132) incident from the optical window towards the one end in an area other than the opening (106). A magnetic field generator (112) generates a magnetic field in the region of intersection of the laser reflected by the right-angle conical mirror (102). A magnetic field gradient relaxation module (130) generates a relaxation magnetic field which relaxes the gradient of the magnetic field generated by the magnetic field generator (112).

A vibration-type angular velocity sensor (100) includes a primary side control circuit (2) and a secondary side control circuit (3) which are configured so that a function as the primary side control circuit (2) and a function as the secondary side control circuit (3) are interchangeable, in which an offset value after interchange and an offset value before interchange are symmetric values with respect to a predetermined reference value.