233results about How to "Avoid affecting measurement accuracy" patented technology

The invention discloses a multifunctional high-accuracy hardened concrete test-piece treatment machine. The multifunctional and high-accuracy hardened concrete test-piece treatment machine comprises a rack, a motor, a speed changing box, a rotating shaft, a drilling bit, a test-piece clamping device, a test-piece horizontal movement mechanism and a vertical lifting mechanism, wherein the rotating shaft is driven by the motor and the speed changing box; the drilling bit is fixed at the free end of the rotating shaft; the vertical lifting mechanism acts on the rotating shaft to enable the rotating shaft to rise and fall in the vertical direction; a test piece is fixed on the test-piece horizontal mvoement mechanism by the test-piece clamping device; the test-piece horizontal movement mechanism can move along the forward-rearward-leftward-rightward directions on the horizontal plane. The multifunctional high-accuracy hardened concrete test-piece treatment machine disclosed by the invention has the advantages that the treatment problems of grinding, core drilling, hole drilling, end-surface abrading and the like before the test are solved; the multifunctional high-accuracy hardened concrete test-piece treatment machine integrates multiple concrete test piece treatment functions, is high in working efficiency and high in processing accuracy, and is used for carrying out various performance tests on the hardened concrete test piece.

The invention relates to the technical field of artificial intelligence, and in particular relates to a laser radar coaxial optical system. The laser radar optical system comprises a transmitting optical unit and a receiving optical unit; the transmitting optical unit comprises a laser, a collimating lens and an MEMS galvanometer; the receiving optical unit comprises a receiving lens and an aperture reflector, wherein the collimating lens, the aperture reflector and the MEMS galvanometer are sequentially arranged on the subsequent optical path of the light beam transmitted by the laser; afterbeing collimated through the collimating lens, the light beam transmitted by the laser passes through the small hole of the aperture reflector, and enters the MEMS galvanometer; the MEMS galvanometerdeflects and reflects incidence laser onto a target object; and reflected light of the target object is reflected through the MEMS galvanometer, and enters the receiving optical unit. According to thelaser radar coaxial optical system and the laser radar in the invention, coaxial optical path design is adopted; transmitting and receiving optical paths are combined through the aperture reflector;exit laser is scanned from the combined laser through the MEMS galvanometer; the laser radar optical system is convenient to debug; furthermore, due to beam combination, optical signal loss is low; and the detection distance is greatly increased.

The invention provides a laser radar system which comprises a transmitting module and a scanning module which are sequentially arranged along a first optical path. The transmitting module comprises alaser transmitting unit and a telecentric lens group; wherein the laser transmitting unit is provided with a plurality of light sources and is used for emitting a plurality of laser beams; the telecentric lens group is used for respectively collimating the laser beams into parallel light beams and enabling the plurality of parallel light beams to be converged along a first light path and transmitted to the scanning module; and the scanning module is used for reflecting the converged parallel light beams to a three-dimensional space and receiving and reflecting echo light beams reflected by a to-be-detected target. The laser radar system can ensure that laser beams emitted at different angles are effectively collimated and emitted, the laser emitting efficiency is ensured to the maximum extent, and the situation that in the working process of the laser radar system, laser beams emitted by a plurality of light sources are partially scattered outside a scanning module to form stray lightcan be avoided.

The invention discloses a foundation pit excavation model test device used in the complicated groundwater environment. The foundation pit excavation model test device comprises a model box, a water tank, symmetry-plane soil retaining units, a foundation pit supporting structure, a pressure-bearing empty space, a confined water pressure adjusting system and a measuring system, wherein the water tank is arranged at the upper right part inside the model box; the symmetry-plane soil retaining units are fixed on the model box; the pressure-bearing empty space is arranged at the bottom of the model box; the confined water pressure adjusting system comprises a miniature water pressure transmitter, an organic glass cylinder device and a flowmeter. According to the foundation pit excavation model test device, dynamic change of water table level and confined water pressure in a foundation pit excavation process can be simulated; water-soil pressure and deformation of a foundation pit under the action of dynamically changed water table level and confined water pressure are measured, related test data are disposed, the issues about foundation pit stress, deformation development rules and the like are determined, effective test data support is provided for research of foundation pit problems caused by complicated groundwater environment such as the dynamic change of the water table level and the confined water pressure and the like, and the basis is provided for a later theoretical analysis model.

The invention relates to an FPGA-based high precision time interval measurement method. The method comprises the following steps: performing rough measurement on the time intervals between two pulsesby adopting a pulse filling counting method to obtain a rough measurement result of the time interval; based on an FPGA tap delay chain, performing fine measurement on a phase difference less than a clock cycle to obtain a fine measurement result of the time interval; and determining a final measurement result of the time interval according to the rough measurement result and the fine measurementresult. According to the method, a wide range of time intervals can be measured by combining the rough measurement and the fine measurement and utilizing the high precision time delay interval of tensof picoseconds of an FPGA delay unit. The invention also discloses an FPGA-based high precision time interval measurement system.

The invention provides a concrete material high temperature splitting testing machine, and a high temperature splitting testing method. The concrete material high temperature splitting testing machine comprises a loading device used for applying pressure on concrete test pieces, a heating device used for heating the concrete test pieces, and a displacement acquisition device used for measuring splitting deformation of the concrete test pieces. In concrete experiments, artful combination of the heating device and the loading device is realized, and the displacement acquisition device is also used, so that a comprehensive test system which can be used for concrete test piece high temperature splitting testing is formed, synchronous heating and loading is realized, and realistic simulation of the environment of concrete at fire disaster high temperature can be realized; and the results of concrete material tests using the concrete material high temperature splitting testing machine are extremely close to the results of the practical splitting performance of concrete at fire disaster high temperature, so that guarantees are provided for study on high temperature and fire-resistant performance of concrete materials.

The invention discloses a capillary rheometer and a method for measuring rheological properties of polymer materials. The capillary rheometer comprises a charging barrel, wherein the front end of the charging barrel is provided with a feed port, and the rear end of the charging barrel is provided with a discharging port. A first capillary channel, a material flowing pipeline and a second capillary channel are arranged in the charging barrel, and the feed port is communicated with the discharging port sequentially through the first capillary channel, the material flowing pipeline and the second capillary channel. The cross-sectional area of the material flowing pipeline is larger than that of the first capillary channel and the second capillary channel. The method can simultaneously measure shearing rheological parameters and extensional rheological parameters of the polymer materials. During measuring polymer composite materials, the method can avoid the influence of artificial factors, reduce the errors in measurement for several times, and increase the accuracy of measurement.

The invention belongs to a laser interferometry ranging technology, and provides an optical fiber frequency domain interferometry ranging system and method based on a DFB array swept light source, inorder to improve the contrast of an interference signal to the maximum extent and realize a wide swept range and very good coherence at the same time. Swept laser generated by the DFB array swept light source firstly enters a wideband optical fiber coupler with a light splitting ratio of 20 to 80, and 20% of split light enters a referential Mach-Zehnder interferometer (MZI); 80% of other light passes through a wideband optical fiber coupler with a light splitting ratio of 10 to 90, and 10% of the light enters a reference arm in two interference arms; and 90% of other light enters a test arm, the test arm adopts a three-terminal circulator structure, the swept laser enters an optical fiber probe from the three-terminal circulator and then is emitted to the surface of a to-be-tested workpiece, the reflected light from the surface of the to-be-tested workpiece is collected by the same optical fiber probe, and then the three-terminal circulator enters a coupler for beam combination to interfere with reference light. The interferometry ranging system and method is mainly applied to the laser interferometry ranging occasions.

The invention relates to a device to test temperature coefficient of metal and alloy low-temperature resistance, especially a device to test metal and alloy resistance continuously in -196deg.C-+200deg.C. The device is composed of three parts including thermostatic part, temperature measurement and control and resistance measurement. Thermostatic part contains cold source (I), heater (II), sealing element (III), thermostatic chamber (III) and insulation course (IV) etc. temperature measurement and control contains platinum hot resistance, copper-constantan thermojunction (or platinum hot resistance) and SWP-N intelligent digital apparatus. Resistance measurement adopts double bridge and potentiometer method. The invention can realize measurement of metal and alloy resistance at any temperature in -196 deg.C-+200deg.C by using the same thermostatic container.

The invention relates to a power joint device. The device comprises a joint body, a power device and a measuring device; the measuring device comprises a first angular measuring device, the first angular measuring device comprises a first magnet and a first magnetic field induction circuit, the first magnet is connected with one end of a motor output shaft, and is close to a first motor cover plate, the first magnetic field induction circuit is arranged on the inner side of the first motor cover plate and is close to the first magnet, a motor rotates to drive the motor output shaft to rotate,and further drive the first magnet to rotate, and the first magnetic field induction circuit induces the rotating angle of the first magnet so as to measure the rotating angle of the motor. Through the first magnet and the first magnetic field induction circuit which are in the non-contact coupling manner, measuring of the motor rotating angle is achieved, mechanical friction losses are avoided, simpleness, lightness, thinness and low cost are achieved, compared with an existing integrated type encoder scheme, mechanical structural design complexity is greatly simplified, a magnetic field generated by the magnet is a static magnetic field, the environment interference influence is avoided, and reliability is high.

The invention discloses a supersonic wave wind-speed and wind-direction measuring apparatus and measuring method. The apparatus comprises an installation base, supersonic wave sensors, a temperature sensor and a wind-speed and wind-direction measuring unit arranged in the installation base. The four supersonic wave sensors are divided into two groups which are disposed on the orthogonal axises of the same horizontal plane with two facing the other two in a horizontal manner. The temperature sensor is arranged on the upper surface of the installation base. The wind-speed and wind-direction measuring unit acquires the forward transmission time and the backward transmission time of the two groups of the supersonic wave sensors as well as the voltage signal inputted by the temperature sensor to obtain the actually measured data about the initial wind-speed, wind-direction and temperature. Then, a BP neural network model is established so as to obtain the corrected wind-speed and wind-direction expression. Based on the initial wind-speed, wind-direction and temperature, the corrected wind-speed and wind-direction are obtained. According to the invention, the BP neural network model is employed to correct the wind-speed and wind-direction, which eliminates the measurement errors caused by the shadow effect and obtains more accurate wind-speed and wind-direction values.

The invention discloses a model testing device for a foundation under the action of dynamic pressure bearing water. The model testing device comprises a model box, an overhead pressing bearing layer, a pressure bearing water pressure adjusting system, a sensor fixing device and a measurement system. The overhead pressing bearing layer is arranged at the bottom of the model box, and the overhead pressing bearing layer is connected with the pressure bearing water pressure adjusting system. The pressure bearing water pressure adjusting system is composed of a mini-type water pressure transformer, an organic glass cylinder device and a flow meter. The organic glass cylinder device communicates with the flow meter, and the height changes of a water column in the organic glass cylinder device is accurately adjusted through the flow meter so that the dynamic changes of the pressure bearing water in the model box can be achieved. The model testing device can simulate the dynamic change process of the pressure bearing water; the water-earth pressure and deformation degree of the foundation under the action of the dynamic water pressure bearing water are measured, and the stress and deformation development rules of the foundation are determined; and the influence of the change amplitude and change rate of the dynamic pressure bearing water on the stability of the foundation is explored, and the effective test data support is provided for research on the foundation problems caused by the action of the dynamic pressure bearing water.

The invention discloses a wireless sensor measurement system of a self-calibration integrated circuit. In the system, the output end of a phase-locked loop is connected with the input end of a power amplifier, and the output end of an amplitude detector is connected with a first data processor; the reference voltage output end of an energy converter is connected with an analog/digital (A/D) converter, the output end of the A/D converter is connected with the input end of a second data processor, and the output end of the second data processor is connected with a load modulator; and the load modulator, the energy converter and one of a pair of resonance coils are connected in parallel, and the power amplifier, the other one of the pair of resonance coils and the amplitude detection are connected in sequence, wherein the A/D converter is provided with a self-calibration circuit, and a self-calibration algorithm circuit is integrated on the first data processor. The wireless sensor measurement system has the advantage that the influences of environment variation, technical errors and the like on measurement precision are weakened.

The invention discloses an intelligent girder segment matching installation control system. The intelligent girder segment matching installation control system comprises an angle sensor and a central control unit, wherein the angle sensor is arranged at the front end of a girder segment to be installed and is used for collecting the data of the included angle between the girder segment to be installed and an installed girder segment; the central control unit is in communication connection with the angle sensor so as to receive the included angle data of the girder segment to be installed and convert the included angle data into altitude data xi of an installation point of the angle sensor; and the central control unit judges whether the height difference of the altitude data xi of the installation point and the theoretical installation height h1 of the girder segment to be installed at the position of the installation point is larger than 2 mm or not, and if yes, the central control unit sends a starting signal to a bridge floor crane. According to the intelligent girder segment matching installation control system, by setting the position relation between the angle sensor and the girder segment and measuring the relative included angle between the girder segments, errors caused by steel girder vibration is avoided, the procedures of the whole girder segment matching process are simplified, informationized and intelligentialized, the control precision is fundamentally guaranteed, and meanwhile the labor cost is also reduced.

The invention relates to an anemorumbometer which comprises a wind speed measuring part and a signal processing part, wherein the wind speed measuring part comprises a casing and a wind speed measuring mechanism; the casing comprises three parts, namely, a wind inlet drum, a wind guide drum and a wind outlet drum; the wind speed measuring mechanism comprises a rotating blade and sensors; the rotating blade comprises a blade root and blade bodies circularly and evenly distributed around the blade root; a wind inlet gap exists between every two adjacent blade bodies, and one sensor is mounted on each blade body and is a Hall element; the rotating blade is connected onto the periphery of a support rod of a support plate through the blade root in a sleeve manner and can rotate relative to the support rod; the signal processing part comprises a conditioning circuit and an operating module, electric signals transmitted by the Hall elements are conditioned and operated, and the wind speed and direction are acquired.

The invention provides a diamond tool bit parameter measurement device and a diamond saw blade welding machine, belonging to the machine tool technology field. The invention solves the problem that the prior art has the problem of lack of measurement accuracy. A thickness measurement assembly in the diamond tool bit parameter measurement device and the thickness measurement assembly in the diamond saw blade welding machine comprise two oppositely-arranged laser distance detection sensors; the two laser distance measurement sensors are connected to a control circuit; and a workpiece to be detected can go through between the two laser distance detection sensors. The invention can dramatically improve the measurement accuracy by adopting two laser distance detection sensors. The installation plate and the rack are not connected through a floating connection structure, which simplifies the structure, guarantees the measurement accuracy and improves the measurement accuracy.

The invention discloses an in-situ soil body layered settlement monitoring device and method. The device comprises a circular base arranged on the top of an exploratory well and multiple settlement monitoring devices. Each settlement monitoring device comprises an anchoring mechanism, a settlement transmission mechanism and a settlement measuring mechanism, wherein the anchoring mechanism comprises a circular base and multiple steel nails, the settlement transmission mechanism comprises a measuring rope, a telescopic pipe and a protection pipe, and the settlement measuring mechanism comprisesa stand column, a pulley mechanism, a measuring scale and a balance weight. The method includes the following steps that firstly, the settlement measuring monitoring devices are installed; secondly, backfill consolidation is conducted; thirdly, the settlement measuring mechanisms are fixed and adjusted; and fourthly, layered settlement monitoring and data treatment are conducted. By means of the in-situ soil body layered settlement monitoring device and method, design is reasonable, the cost is low, time and labor are saved, installation is convenient, soil body deformation monitoring at different heights of an in-situ soil body is achieved, and practicability is high.

With the two measuring points setup at the vertical shaft to be measured, the altitudes of the measuring points are measured. The four measuring blocks possessing smooth horizontal surfaces are setup at four sides of the vertical shaft to be measured. Moving the reassuring positions in sequence carries out the measurement. The data of the measuring blocks are recorded by using a dial indicator. Combining the previous measured parameter, using the formula calculates the swing or relative swing of the vertical shaft. The equipment used in the invention comprises the dial indicator possessing smooth base, the device including two connected fine wires for setting measuring points and the said measuring blocks for mounting the dial indicator. No bulky barring equipment is needed in the measuring process. Thus, the invention lowers measuring cost and increases the measuring accuracy.

The invention relates to a small propeller rotation speed measurement device and a measurement method thereof and belongs to the field of automatic detection. The measurement device comprises telescopic supporting legs, a first measurement ring which is set horizontally, a second measurement ring which is set horizontally, a laser transmitter, a laser receiver, a supporting frame and a data collection computer. The telescopic supporting legs are fixedly connected with a bottom surface of the first measurement ring. The second measurement ring is located above the first measurement ring. One end of the supporting frame is fixedly connected with the first measurement ring, and the other end is fixedly connected with the second measurement ring. The laser transmitter is fixedly connected withthe first measurement ring. The laser receiver is fixedly connected with the second measurement ring. The laser receiver and the laser transmitter are set oppositely. The data collection computer iselectrically connected with the laser receiver. The measurement device has the beneficial effects that the whole measurement device is completely independent, is integrated and is not connected with apropeller and a control system thereof, so mounting is convenient and repaid and measurement is facilitated.