31results about How to "Improve the means of measurement" patented technology

The invention relates to a method for measuring a micro impulse, more particularly to for a second harmonic multi-beam laser heterodyne measurement method for a micro impulse based on doppler oscillating mirror sinusoidal modulation. The invention aims at solving a problem of poor qualities of collected laser difference frequency signals and slow operation speeds of signal processing during microimpulse measurement in the current laser heterodyne method. According to the method, a pulsed laser emits a pulse laser excitation working medium target that generates plasma injection, and the plasma injection enables a crossbeam of a standard beam to make rotations; driving powers of an H0 solid state laser and an oscillating mirror are started; the oscillating mirror, which is driven by the driving power, makes simple harmonic motions and carries out modulation on optical frequencies that are incident to the front surface of the oscillating mirror at different times; and a signal processing system collects continuously signals emitted by a photoelectric detector during a swing process of a torsion pendulum system and also carries out processing on all continuously obtained signals, so that a micro impulse I exerted on the crossbeam of the standard beam is obtained. According to the invention, the method has advantages of high qualities of collected laser difference frequency signals and a fast operation speed during signal processing.

The invention provides a device for measuring torsional pendulum micro impulse through linear frequency modulation multi-beam laser heterodyning and a torsional pendulum micro impulse measuring method based on the device, and belongs to the field of torsional pendulum micro impulse measurement. The device and method are used for solving the problem that an existing torsional pendulum micro impulse measurement method and device are low in measurement precision. Laser emitted by a pulse laser acts on a working medium target to generate plasma jet, the back jet effect enables a standard beam to rotate, while the standard beam rotates, a linear frequency modulation laser continuously emits linear frequency modulation laser light which is reflected to a plane standard mirror through a first plane mirror and a second plane mirror, the front surface and the rear surface of the plane standard mirror both reflect the linear frequency modulation laser light, the linear frequency modulation laser light is gathered on the photosensitive face of a photoelectric detector through a convergent lens, the photoelectric detector sends electric signals to a signal processing system to obtain a tilt angle theta' of the standard beam, and according to a formula, micro impulse I' generated by the effect of the laser emitted by the pulse laser and the working medium target is obtained. The device and method are suitable for measuring the torsional pendulum micro impulse.

The invention provides a frequency sweep measurement method and frequency sweep measurement system based on a diversity concept. The frequency sweep measurement method comprises the following steps: an emission frequency receiving at least one frequency sweep signals, and radiating the frequency sweep signals to space; a multi-port detected antenna with two mutually orthogonal receiving ports receiving the frequency sweep signals, and obtaining main polarization signals and cross polarization signal; a receiving device receiving the main polarization signals and the cross polarization signals; and a processing unit obtaining level of the main polarization signals, the level of the cross polarization signals and an rotation angle of the multi-port detected antenna, and generating and outputting an antenna direction map according to the level of the main polarization signals, the level of the cross polarization signals and the rotation angle of the multi-port detected antenna.

The invention provides a device for measuring torsional pendulum micro impulse through linear frequency modulation multi-beam laser heterodyne and a torsional pendulum micro impulse measurement method based on the device and relates to the technical field of torsional pendulum micro impulse measurement. By the adoption of the device for measuring torsional pendulum micro impulse through linear frequency modulation multi-beam laser heterodyne and the torsional pendulum micro impulse measurement method based on the device, the problem that by the adoption of an existing device and method for measuring torsional pendulum micro impulse, the measurement precision is low is solved. According to the device for measuring torsional pendulum micro impulse through linear frequency modulation multi-beam laser heterodyne and the torsional pendulum micro impulse measurement method based on the device, a laser emitted by a pulse laser device acts on a working medium target, so that plasma spray is generated, a standard beam rotates under the action of back spray, when the standard beam rotates, a linear frequency modulation laser device continuously emits linear frequency modulation lasers, the linear frequency modulation lasers are reflected by a first plane mirror and a second plane mirror and irradiate a plane standard mirror in an incidence mode, the front surface and the rear surface of the plane standard mirror both reflect the linear frequency modulation lasers, the linear frequency modulation lasers are focused on a photosensitive surface of a photoelectric detector through a convergent lens, the photoelectric detector sends electric signals to a signal processing system, so that the tilt angle theta' of the standard beam is obtained, and then the micro impulse I' generated by action between the lasers emitted by the pulse laser device and the working medium target is obtained according to a formula. The device for measuring torsional pendulum micro impulse through linear frequency modulation multi-beam laser heterodyne and the torsional pendulum micro impulse measurement method based on the device are suitable for torsional pendulum micro impulse measurement.

The invention discloses a device and a method for measuring thickness of glass through multi-beam laser heterodyne second harmonic based on Doppler oscillating mirror sinusoidal modulation, relates to the device and the method for measuring thickness of glass through multi-beam laser heterodyne second harmonic based on Doppler oscillating mirror sinusoidal modulation, and aims to solve the problems of non-ideal laser difference frequency signal quality and signal processing operation speed of a signal acquired by the conventional multi-beam laser heterodyne detection-based dynamic angle measuring algorithm. The method comprises the following steps of: adjusting positions of a plane mirror and a glass plate of which the thickness is to be measured; starting a laser while simple harmonic vibration is done by an oscillating mirror; and continuously acquiring an electric signal output by photoelectric detector through a signal processing system and processing the acquired signal to acquire the thickness of the glass plate of which the thickness is to be measured. The device and the method have the advantages of high laser difference frequency signal quality and high signal processing operation speed of the acquired signal, and can be widely applied to laser radar, machinery, instruments and meters and electronic product manufacturing industries.

The invention discloses a parallel three-freedom-degree mechanism device based on oscillating cylinder driving and a control method. The device comprises a fixed platform, a movable platform, three parallel driving control branches, a pneumatic unit, a signal detection module and a control unit. Each parallel driving control branch comprises an oscillating cylinder, a drive rod and a driven rod which are sequentially connected, wherein the oscillating cylinder is fixedly connected to the fixed platform and connected with the pneumatic unit, and the driven rod is fixedly connected with the movable platform. The signal detection module comprises an acceleration sensor, an angular speed sensor and angular displacement encoders. The acceleration sensor and the angular speed sensor are installed on the movable platform. The angular displacement encoders are connected to the bottoms of the oscillating cylinders through couplers. The control unit is connected with the pneumatic unit and the signal detection module. According to the parallel three-freedom-degree mechanism device based on oscillating cylinder driving and the control method, proper design of the oscillating cylinders and a mechanical arm is selected to be applied so that the device can achieve the optimal working space and the optimal working track which correspond to the device, and feedback control over the movement of the device can be achieved.

The invention provides a device and method for measuring the micro-impulse based on a linear frequency modulation multi-beam laser heterodyne quadratic harmonic method and a torsional pendulum method, and belongs to the field of optics. The device and the method aim at solving the problems that when the micro-impulse is measured through an existing laser interference method, accidental errors are large and measurement accuracy is low. The device comprises a linear frequency modulation laser device, a first plane mirror, a torsional pendulum system, a pulse laser device, a plane standard mirror, a converging lens, a photoelectric detector and a signal processing system. Laser beams emitted by the pulse laser device and a working medium target act to generate plasma jetting, and a standard beam is made to rotate under the reverse jetting action. Linearly-polarized light passes through the surface of a second plane mirror pasted on the standard beam, the light, transmitted by the front surface of the plane standard mirror, of reflected light is reflected by the rear surface of the plane standard mirror and then converged to the light sensitive face of the photoelectric detector through the converging lens together with the light, reflected by the front surface of the plane standard mirror, of the reflected light, the tilt angle of the standard beam is obtained through the signal processing system, and therefore the micro-impulse generated when lasers and the working medium target act is measured.

The invention belongs to the field of liquid rocket engine test parameter testing, and particularly relates to an LMS acquisition system and a water hammer pressure parameter calibration method and processing method thereof. The problem that an existing water hammer pressure acquisition system is low in signal acquisition accuracy is solved, a water hammer pressure signal is used as a new thoughtof dynamic signal acquisition, and the water hammer pressure signal and dynamic parameters such as vibration and pulsating pressure are acquired together by means of the characteristic that an LMS acquisition system is high in acquisition rate (generally 25.6 kHz or above). The water hammer pressure signal is accurately obtained; the LMS acquisition system and a water hammer pressure signal conditioner need to be combined, a new water hammer pressure parameter calibration and measurement method needs to be researched and explored, and meanwhile, measurement data can explore a new water hammerpressure parameter measurement data processing method by utilizing powerful time domain, frequency domain and other calculation and analysis functions of the LMS so as to meet the water hammer pressure parameter measurement requirements.

The invention discloses a windshield wiper system installation method based on a motor train unit windshield wiper mounting inspection device, relates to the technical field of motor train unit manufacturing, and solves problems that according to an existing mounting method, wiper arm middle position deviation and wiper arm shaking are likely to occur, and dynamic matching of data cannot be achieved. According to the installation method for optimizing the windshield wiper system based on the motor train unit windshield wiper installation inspection device application, accurate adjustment of installation data of all working condition positions can be achieved in the assembly stage; meanwhile, all dynamic performance inspection is achieved, the product quality is improved, the labor intensity is reduced, and production resource waste is avoided. The installation process is improved, and the adjustment efficiency and quality data accuracy are improved; in the installation process of an assembly site, all-working-condition installation data of the windshield wiper system can be checked, the measurement means is improved, and the adjustment precision is improved; all operation conditions of the windshield wiper are achieved through the motor train unit windshield wiper installation inspection device, and the installation quality is inspected through dynamic functionality.

The present invention discloses an indoor temperature real-time measurement transmission system, comprising a master machine connected to a PC end and a slave machine placed at other positions in a room, wherein the slave machine controls a temperature sensor module to collect temperature data in the room in real time and displays the temperature data through a liquid crystal display circuit module, and simultaneously transmits the temperature data to the master machine through a wireless communication module, the master machine receives and displays the temperature data through the liquid crystal display circuit module, and in the same time the master machine connects to the PC end through a CH340 USB serial port circuit module and can display the indoor temperature in real time through aserial port debugging assistant. The system applies intelligent temperature sensing technology, bluetooth wireless communication technology and computer network technology to measurement and transmission of the indoor temperature, technically improves measuring methods in the background of smart home, and can improve accuracy of the indoor temperature measurement.

The invention discloses a bridge natural vibration mode acquisition method based on an MIMO radar. The bridge natural vibration mode acquisition method comprises the steps of: carrying out static clutter suppression on a plurality of continuous frames of scene imaging results to obtain a group of time phase sequences corresponding to each pixel point, and acquiring a scene vibration region distribution diagram through vibration detection; respectively adopting an MUSIC algorithm and a least square estimation algorithm to obtain estimated values of the vibration frequency and the vibration amplitude of the vibration region; carrying out connected domain analysis on the basis of the vibration amplitude diagram to obtain a bridge body mark in the image; and finally, rotating the bridge body,counting the amplitude of the bridge body in the extending direction, and fitting to obtain a bridge body vibration mode curve. According to the bridge natural vibration mode acquisition method, the vibration distribution diagram of the whole scene can be obtained on the premise of not contacting a to-be-detected building or bridge body, and a more accurate vibration mode curve is obtained by extracting the amplitude information of each position of the bridge body, so that a concise, efficient and accurate measurement method is provided for bridge body vibration information acquisition and self-vibration mode detection.