138results about "Measurement devices" patented technology

The invention discloses an automated linear displacement sensor calibration device which mainly comprises a substrate, and dual linear guide rails, a grating ruler, a servo motor and a vertical lifting device which are fixed on the substrate; a roller screw rod is connected with the servo motor by a coupler; a horizontal regulation device, a universal clamp and a locking nut are clamped with one another and are connected with the vertical lifting device; a sliding laser reflection mirror support frame, a sliding laser interferoscope support frame and a sliding dual-frequency laser interferometer support frame are fixed on the linear guide rails; a fixed pull rod, a laser reflection mirror and a grating ruler reading sensor are fixed on the sliding reflection mirror support frame; a laser interferoscope is fixed on the sliding interferoscope support frame; a dual-frequency laser interferometer is fixed on the dual-frequency laser interferometer support frame. The calibration precision can be ensured by the arrangement of the laser calibration mechanism, manpower and time cost are greatly reduced, and the calibration work efficiency is enhanced.

The invention discloses a method of automatic generation for digital cities, applied to a general-purpose computer system and comprising the following steps: obtaining the remote sensing land image of a presumptive area and monitoring the shadow lengths of all the objects in the remote sensing land image through an algorithm for detecting shadows; vectoring the remote sensing image to obtain the shapes of different objects and match with the position of the shadow to obtain the lengths of the objects; recognizing the different objects in the remote sensing image according to the characteristics of the image in an image database; forming automatically the three dimensional model of the objects in the area according to the types, the shapes of the base, the shapes of the footstock and a highly combined model base of the objects in the area. The method of the invention can form automatically large range digital cities to meet the need of time effectiveness in city application, and only needs remote sensing images and DEM as basic data so that the invention has low cost and the possibility of application in government, commerce, living, etc.

The invention discloses a method for correcting feedback of an inertial navigation system/global position system (INS/GPS) combined navigation system based on lever arm estimation. The method comprises the following steps of: extending a lever arm error to a system error state vector for estimation, judging whether a random error of an inertial device is accurately estimated through comparing whether the difference between a lever arm estimation value and a true value exists in an error threshold range, wherein the error of the inertial device is effectively estimated when the error of the lever arm estimation value is smaller than a set threshold value, measured outputs of a gyroscope and an accelerometer are corrected by utilizing the error of a random constant of the estimated inertial device, and unity feedback correction is performed during combined Kalman filtering, otherwise, feedback correction is not carried out on the error of the inertial device. According to the method, the error of the random constant of the inertial device can be subjected to effective estimation and unity feedback correction, and the precision of the INS/GPS combined navigation system can be effectively improved.

The invention discloses an altitude difference calibration method and a system of an inertial navigation prism and relates to the technical field of precise guidance and alignment of rocket vehicles.The method comprises the steps of fastening an inertia unit navigation system equipped with the prism, as a core rocket component, on a rotary table, collimating and observing horizontal azimuth angles and pitching angles of the inertial navigation prism in various positions through a theodolite by controlling different positions of the rotary table to rotate, calculating a horizontal azimuth angle and an altitude difference of a similar observation celestial body according to rotary table angles, the horizontal azimuth angles and the pitching angles of the corresponding positions, and calculating a mounting deviation of the inertial navigation prism. The method and the system are based on a celestial navigation altitude difference positioning principle, achieve precision calibration of the mounting deviation of the inertial navigation prism through multiposition observation of the inertial navigation prism, are high in precision and simple and convenient to use and have better socialextended application value and economic value.

The invention discloses a long-term observing and biology trapping device for a deep sea environment.The device comprises a buoyancy device.The device is characterized in that a rack connected with the buoyancy device is included, the rack is provided with glass power supply bins which are internally provided with power supplies and low-power dissipation power supply managing circuits in a packaged mode, biology trappers, a deep sea image observing instrument, a deep sea environment parameter measuring instrument and an acoustic releaser, and the acoustic releaser is connected with a bearing block.The device is suitable for full deep sea environment observation and entrapment of large deep-sea near-bottom fishes with the high action capacity, supplies technical support to deep sea scientific research and has the advantages of being suitable for deep-sea long-term observation, increasing the trapping sampling success rate and avoiding the phenomenon that a carrying instrument is damaged due to the fact that the instant shock is too big when the device lands under the sea.

The invention discloses a railway special line vehicle safety monitoring device and method. In the device and method, a scanning camera, a light source, a laser sensor, a weighing and metering device,a vehicle number recognition device and a server are arranged. The server is respectively connected with the scanning camera, the laser sensor, the weighing and metering device, and the vehicle number recognition device so that it can record weight information, vehicle number information and top load status three-dimensional information of railway vehicles and vehicle stopping time information ofspecial line at the same time, and complete automatic collection and processing of status information of loading and unloading vehicles of special line through the server, thereby avoiding influenceof inconsistent time on the integration of different information, realizing effective integration of railway vehicle information, improving matching accuracy of a variety of information of the vehicles, and improving safety monitoring efficiency of railway freight.

The invention belongs to the fields of measurement and detection, particularly relates to a centering and leveling work platform for a high-precision cylindricity measuring instrument and aims to provide the centering and leveling work platform which has the advantages of simpler structure, small regulating resistance and high feeding precision. The centering and leveling work platform comprises a centering device, a leveling device and a support device, wherein the centering device and the leveling device are mounted on the support device, the centering of the work platform is implemented by the centering device, and the leveling of the work platform is implemented by the leveling device. Centering is carried out through the adoption of a bevel gear steering box 5, a centering worm gear box 7 and a centering feeding head 22, and the input-output angle of the worm gear box is converted by a bevel gear. Besides, a spring is utilized to apply a certain pre-tightening force, centering shift is transmitted through the rolling of steel balls in a centering ball disc, and sliding friction is replaced by rolling friction, so that the resistance is reduced, and the error is reduced to a certain degree, therefore, the centering precision is improved.

The invention discloses a detection method, apparatus, and system for axial displacement. The method comprises: axial displacement detected by each of multiple axial displacement sensors is obtained, wherein the detection direction of each axial displacement sensor is parallel to a rotor axis of a rotation component and the multiple axial displacement sensors are arranged at the same side of a detection plane and are arranged uniformly along the peripheral direction of the rotation component; and according to the obtained multiple axial displacement sensors, target axial displacement of the rotation component is determined. Therefore, a technical problem that the detection result of the axial displacement is not accurate due to detection plane inclination can be solved.

The invention discloses an intelligent underwater combined navigation fault diagnosis method which comprises the following steps: classifying faults of an underwater combined navigation system into a noise burst type system fault, an information burst type system fault and an information gradual change type system fault; judging whether the burst type system fault happens or not by using an improved residual*2 detection method; if the burst type fault happens, isolating a fault subsystem; calculating an average residual value and a residual absolute sum value, and judging whether the system has the noise burst type system fault or the information burst type system fault according to the calculation result, so as to make a preparation for system reconstruction after the fault of the fault subsystem is eliminated; and calculating an average normalization residual value and an adjacent statistic period residual absolute sum value, and judging whether the gradual change type fault happens or not according to the calculation result. By adopting the method, the defect that a fault detection system judges a fault system as a non-fault system by mistake because of the tracking characteristics of a filter is avoided, and meanwhile, various faults in the underwater combined navigation system can be rapidly and accurately judged.

The invention relates to a multi-channel high-speed fiber optic gyroscope data acquisition and testing system, which comprises a multi-channel high-speed data acquisition system for simultaneously acquiring data of a plurality of fiber optic gyroscopes, a controllable independent power supply system for supplying power to the plurality of fiber optic gyroscopes independently, and an upper computercarrying fiber optic gyroscope performance testing software and controlling a temperature box and a turntable. The multi-channel high-speed fiber optic gyroscope data acquisition and testing system can simultaneously test the performance of the plurality of fiber optic gyroscopes, improves the fiber optic gyroscope testing capacity, and effectively solves the bottleneck that the production and delivery of the gyroscopes are affected by the lag of the fiber optic gyroscope testing capability at present.

The invention relates to a calibration technology-based encoder precision improving method and belongs to the technical field of mechatronics and sensor measurement. According to the method, while a high resolution and low precision encoder is prevented from hardware increase and encoder resolution reduction, precision of the encoder is improved via a polynomial calibration algorithm; the polynomial calibration algorithm and calibration parameters are stored in a programmable digital processor in the encoder; when the encoder works, the calibration parameters are called via the polynomial calibration algorithm for calibrating an encoder angle, and the precision of the encoder can be improved by more than 10 times. Via the method disclosed in the invention, the precision of the encoder is improved while the resolution of the encoder is not compromised. The method is suitable for data processing operation of all kinds of high resolution and low precision encoders.

The invention discloses an error compensation method for a bias temperature of a fiber optic gyroscope, comprising the following steps of: A. attaching N temperature sensors on a fiber coil of the fiber optic gyroscope, wherein at least one temperature sensor is attached to the inner side of the fiber coil, and at least one temperature sensor is attached to the outer side of the fiber coil; and Nis greater than or equal to 2; B. establishing a temperature error model of the fiber optic gyroscope as shown in the description; C. carrying out temperature error compensation on the fiber optic gyroscope according to the temperature error model. According to the error compensation method for the bias temperature of the fiber optic gyroscope, the temperature error of the fiber optic gyroscope iscompensated based on a multi-point temperature, the situation that the fiber coil is affected by the temperature effect can be fully reflected, the bias temperature drift condition of the fiber opticgyroscope is compensated more effectively, and the precision of the fiber optic gyroscope is effectively improved.

The present invention provides a dust-free workshop, the workshop is provided with a first dust-free room, a second dust-free room, a third dust-free room, a buffer room, a controller and a test board, a dust removal water treatment system is arranged below the floor of the workshop, and a lifting-type local environment detection device is arranged on the top of workshop and can be moved from the first workshop to the third workshop. The dust-free workshop is additionally provided with the dust removal water treatment system and the lifting-type local environment detection device on the basis of an original dust removal system, dust-free levels of in different working rooms in the workshop can be greatly improved, the design is reasonable, the operation cost is low, and the dust-free workshop is safe and reliable, and is a powerful dust-free guarantee of a precision workshop.

The invention discloses an automatic early warning and monitoring device system for urban road underground collapse, and belongs to a road geological disaster monitoring technology. According to the technical scheme, the system is characterized by comprising an underground early warning device and an overground early warning information receiver; a signal transmission module, a displacement sensor, a power supply and a power switch are fixedly connected to the side wall of the cavity in the body and are connected in series through wires; a horizontal transverse shaft is arranged in the sealedcavity, the two ends of the transverse shaft are rotationally connected with the inner wall of the cavity through bearings, and a displacement line is wound on the transverse shaft; a containing groove is formed in the lower end of the body, a falling body is arranged in the containing groove, one end of the displacement line is connected with the power switch, the other end of the displacement line enters the containing groove to be fixedly connected with the falling body, and the displacement sensor is close to the displacement line. The problem that the conventional monitoring technology isnot suitable for directly monitoring the underground collapse of the urban road is solved, and the effect of early warning before the pavement collapse is formed is achieved.

The invention discloses a vehicle size detection method and device. The vehicle size detection device comprises a signal collection system, a signal processing system and at least one selected from a height measuring system, a width measuring system, a length measuring system and a wheelbase measuring system, wherein signal collection system collects signals output by at least one of the height measuring system, the width measuring system, the length measuring system and the wheelbase measuring system, and sends the signals to the signal processing system; the signal processing system outputs height, width, length or wheelbase signals according to the received signals; and the height measuring system comprises at least one pair of induction points which is arranged at preset height of at least one group of light screen sensors, and the height signals are analog signals. The cost of the size detection device for special vehicles is reduced, and parameters including the height, width, length and wheelbase of the vehicle can be accurately detected.

The invention provides a chassis photographing detection device and a control method thereof, and the device comprises a motion mechanism which is provided with a control assembly, a map scanning assembly and a camera assembly, and the control assembly is connected with the map scanning assembly and the camera assembly, wherein the map scanning assembly is used for generating chassis map data of ato-be-detected vehicle; the control assembly is used for determining at least one to-be-detected point location based on the chassis map data and controlling the movement mechanism to move to each to-be-detected point location; the camera shooting assembly is used for shooting chassis images of all to-be-detected point locations. According to the invention, the flexibility and applicability of chassis photographing detection can be effectively improved.

The invention discloses a temperature and humidity monitoring and alarming system, which comprises a singlechip and an information acquisition module, and is characterized in that the singlechip comprises a data storage unit, a rule storage unit and a data analysis unit; the information acquisition module comprises a temperature sensor and a humidity sensor; the temperature sensor is connected with the data storage unit of the singlechip through an analog-to-digital converter; the humidity sensor is directly connected with the data storage unit of the singlechip; a keyboard system is connected with the rule storage unit of the singlechip through a man-machine conversation interface; and an alarming system and a display system are connected with the data analysis unit of the singlechip through the man-machine conversation interface. By adopting a detection system, the temperature and humidity monitoring and alarming system is simple in structure, small in size, high in instantaneity and favorable for acquiring ambient temperature and humidity in real time.

The invention discloses an intelligent warehouse for a container for dangerous chemicals. The intelligent warehouse comprises the container; transparent glass is embedded in the side surface of the container; a resonance trough is formed in the lower end in the container; grooves are communicated with the two ends of the inner part of the resonance trough; the inner sides of the grooves are fixedly connected with resonance springs; resonance blocks are fixedly connected with the other ends of the resonance springs; a resonance plate is fixedly connected with the other sides of the resonance blocks; the surface of the resonance plate is connected with the inner side of the resonance trough in a sliding manner; a transition plate is fixedly connected with the upper end of the resonance trough. The intelligent warehouse has the advantages that when the container is assembled and moved, the dangerous chemicals in the container are subjected to anti-vibration protection, unloading is relatively convenient, the working efficiency of workers is greatly improved when the storage safety is ensured, and the intelligent warehouse is fixed placed and used, and the using range is relatively large.

The invention discloses a method for measuring the temperature and humidity of a concrete test piece under a constant axial pressure load. According to the method, measurement is carried out under theeffect of a constant axial pressure load. The method has clear steps and is based on the simple principle; and the measurement process is easy to operate. The result demonstrates that the axial pressure load has the obvious impact on the relative humidity of the concrete; and at the moment of load application, the relative humidity increases instantaneously and then decreases slowly.

The invention discloses a mango base monitoring system and belongs to the field of wisdom agriculture. The system comprises a control center, an environment parameter collecting module, a video monitoring module, and an irrigation module. The control center is used for receiving data, transmitting data, analyzing data, storing data and displaying data, and the control center is loaded with a database of various mango tree maintenance information; the environment parameter collecting module is used for detecting environment situations in the mango base in real time and sending detection data tothe control center; the video monitoring module is used for collecting image information in the mango base in real time and sending the image information to the control center; the irrigation modulecan receive a control instruction sent by the control center and irrigate all mango trees in the mango base. The invention aims to provide a mango base monitoring system for solving the problem of lowmango base management efficiency.