98results about How to "Ensure measurement accuracy" patented technology

Method and apparatus for simultaneous acoustic measurement at a point (M) in space of the three components of the sound intensity vector. A preferred omnidirectional vector probe (40) includes a central ring (42) with four small, microphones on tubes attached to the ring spaced from one another in a regular tetrahedral arrangement. The tubes are parallel to the axis of the ring, two on one side (58) and two on the reverse side (60) of the ring, with two of the microphones pointing in one direction and two in the opposite direction. The microphone signals are processed by an analog-to-digital converter feeding a digital signal processor (68) and employing a cross-spectral formulation to compute a sound intensity vector at the measurement point (M). Sound velocity and pressure can also be determined at this point. The resulting data may be outputted on a computer screen or other device (70). Additional related features and methods are disclosed.

A three-dimensional measurement apparatus of a slit light (or pseudo slit light) projection type that is adapted to prevent deterioration of measurement accuracy and to be easily miniaturized. When there is a disturbance in a region A in a distribution of pixels whose detected luminances exceed a threshold, a detected position C3 determined from a weighted average of luminances of pixels selected under a threshold condition along a scanning line traversing a bright portion image and liable to be deviated from a correct detected position line B-B is excluded from data to be used for the three-dimensional measurement, whereas detected positions C1, C2 are adopted that are determined so as to correspond to scanning lines on each of which pixels whose number falls within an allowable range are detected. The allowable range varies from Nav×αmin to Nav×αmax or from Nav−β to Nav+γ, where Nav is an average of the numbers of pixels detected on scanning lines for each of which at least one pixel is determined, and αmin, αmax, β, and γ are minimum proper ratio, maximum proper ratio, subtract number of pixels, and add number of pixels, respectively, which are set in advance as parameters.

The invention discloses a safety cut-off type remotely-controlled intelligent mass flow rate gas meter and a management system thereof, and belongs to a gas metering device. The gas meter comprises a microcomputer controller, a micro-electro-mechanical system metering unit, a valve control circuit, a gas working condition collecting and processing unit and a communication module. The micro-electro-mechanical system metering unit accesses to the microcomputer controller through a signal collection unit and a signal processing unit sequentially. The microcomputer controller is connected with a cut-off valve through the valve control circuit and is also connected with the communication module. The safety cut-off type remotely-controlled intelligent mass flow rate gas meter and the management system thereof have the advantages that a mass flow rate metering principle is adopted, and mechanical transmission components are omitted, so that metering problems caused by mechanical aging are avoided, and metering accuracy is guaranteed; a temperature correction function is achieved through mass flow rate metering, a correction device does not need to be arranged externally to compensate temperature and pressure, and the whole meter is small in size, high in metering accuracy and high in reliability.

The invention discloses an openable Rogowski coil assembly for measuring lightning current in a power transmission line. The openable Rogowski coil comprises an upper coil shell, a lower coil shell, a flexible Rogowski coil spiral bobbin, a winding coil, an insulating sleeve, an inner shielding layer, a heat shrinkable tube and the like. The winding coil evenly winds in a spiral groove of the flexible Rogowski coil spiral bobbin; the insulating sleeve, the inner shielding layer and the heat shrinkable tube sleeve the flexible Rogowski coil spiral bobbin and the winding coil in sequence. The flexible Rogowski coil spiral bobbin with a screw thread and a positive-reverse double-layer winding method are adopted, uniform winding of the winding coil can be guaranteed, electromagnetic interference resistance of the Rogowski coil can be improved, and the problem that the traditional closed hard-structure Rogowski coil is inconvenient to mount on the site is effectively solved. An epoxy resin layer filled in a cavity of a bobbin shell helps improve overall mechanical strength and stability of the Rogowski coil, deformation of the Rogowski coil caused by accumulated external force can be avoided, and measuring precision and service life are guaranteed for the Rogowski coil.

The present invention relates to a method and apparatus for measuring breath alcohol concentration of a user. A flow of an expired breath sample is passed through a fuel cell sensor giving an output signal proportional to the amount of alcohol present in the breath sample. By measuring the flow rate, the volume of the breath sample may be calculated, whereas the breath alcohol concentration is calculated based on the fuel cell output signal. Both the sample volume and the breath alcohol concentration values are continually updated by integrating the measured instantaneous flow rate and the fuel cell output signal over time. If the user stops blowing, flow compensation is performed to obtain a compensated fuel cell output signal using a stored calibration volume. Hence, an improved method for accurately measuring the breath alcohol concentration of a test person is achieved, capable of handling varied expired volumes of breath, which obviates the need for a sampling mechanism.

The invention discloses a high-efficiency energy-saving cement grinding aid and a preparation method thereof. The high-efficiency energy-saving cement grinding aid comprises the following components in parts by weight: 10 to 25 parts of triethanolamine, 0.5 to 1 part of polyacrylamide, 3 to 5 parts of calcium formate, 5 to 8 parts of sodium gluconate, 5 to 10 parts of basic salt, 10 to 15 parts of stabilizing agent, and 25 to 50 parts of water. When the general content of added cement grinding aids is 0.04 percent, the output of a grinding mill can be increased by over 10 percent, and the three-day and twenty-eight-day compressive strengths of the cement can be increased by about 15 percent.

The invention discloses a thermoshrinkable polyester film and a preparation method thereof. The preparation method comprises steps as follows: various polyester raw materials subjected to dust removal respectively enter storage bins, are respectively metered by an agravic weigher according to the proportion, simultaneously enter an inlet of a double screw extruder, are subjected to melt extrusion by a sandwich layer double screw extruder and two surface layer double screw extruders, and form a casting piece through a three-layer co-extrusion die head; the casting piece is respectively subjected to longitudinal stretching and lateral stretching, wherein the longitudinal stretching comprises a preheating zone, a stretching zone, a thermal setting zone and a cooling zone, and the thermal setting zone of the lateral stretching is more than 15m long; and the casting piece is subjected to traction rolling to obtain the thermoshrinkable polyester film. By adopting the proportioning mode of directly feeding after accurate metering by people, the instantaneous addition error range of various materials is at most 1%; and the material is biaxially stretched, so that the produced film has the advantages of greatly higher density, strength and uniformity, lower longitudinal shrinkage and lateral low-temperature shrinkage, and especially higher ductility and thermoshrinkable uniformity.

The invention relates to a method for producing sinter solder, which comprises preparing material, mixing, making particles, pre-drying, drying, selecting, sintering, cooling, selecting, magnetic selecting, checking, and packing, wherein the invention uses dry-wet mixing separating technique, to eliminate the dead corner and confirm the uniform product, with stable product quality. And it uses vibration fluidize drying technique to reduce block ratio in drying process under 5%. And it coats anti-adhesive coat on the contact with material. The invention uses left heat recycle technique, to recycle the heat when cooling solder into former processes to dry the semi product. And the energy consumed by roller drier is from the left heat.

The invention discloses a preparation method of higher fatty acid alkaline earth metal salt, which comprises the following steps: pre-mixing and dispersing fused higher fatty acid and micro-powdery alkaline earth metal oxide or hydrate, continuously feeding into a high-speed mixer capable of controlling the pre-mixing time together with a water solution containing a catalyst and a moistening agent, continuously outputting to a heat-insulation tank, keeping for a certain period of time at the proper temperature, and pulverizing to obtain a powdery higher fatty acid alkaline earth metal salt product. The preparation method has the advantages of simple process, simple equipment, mild reaction conditions, energy saving, and higher purity of the product.

The invention discloses an intelligent sampling metering device and identification method for identifying magnetic field interference, which belongs to the technical field of gas meters and solves the technical problem of inaccurate identification of external magnetic field interference in the prior art. The intelligent sampling metering device in the present invention includes a metering device and a sampling device, the metering device includes a metering code disc and a magnet installed on the metering code disc, the sampling device includes a control board and a sensor group located on the control board, and the sensor group includes the first sensors distributed on two concentric circles group and the second sensor group, the first sensor group and the second sensor group respectively include several sensors distributed on the same circumference, the projection of the magnet on the control board is located in the area between the two concentric circles, and the metering code disc drives the magnet Rotation, the rotation of the magnet causes the state change of the magnetic signal in the sensor group, and the judgment of the external interference magnetic field is realized through the change of the magnetic signal state of the sensor group.

A complex surface three-coordinate measuring device includes a three-degree-of-freedom motion platform and a force control probe, the force control probe is fixedly mounted on the Z-axis sliding block, which is in the same direction as the X-axis direction and used to contact with the workpiece surface with constant force. A six-axis force sensor is used to collect the contact force between the stylus and the workpiece surface. In this method, the force control is realized in the measurement to make the stylus in constant force contact with the workpiece surface. The error compensation direction is determined according to the direction of the contact force, and then the effective radius of the stylus spherical head is compensated in this direction, thus the actual contact point of stylus and workpiece can be obtained.

The invention relates to a dry powder inhalation dosing device and belongs to the field of inhalation type dosing instruments. A vibration gear is arranged below a dosing measuring module and provides longitudinal vibration for the dosing measuring module. Through a mode of single vibration or double vibration of medicine powder in a medicine powder storage container, the dry powder inhalation dosing device has good medicine powder adaptability and convenience in adjusting mechanical structure parameters design vibration effects, so that the metering accuracy of the medicine powder dose provided by a medicine storage unit in the process of medicine dosing by the whole dry powder inhalation dosing device each time is guaranteed better. The operating steps of the whole dry powder inhalation dosing device are simplified, and the better operating convenience is provided for the use by patients. When the dry powder inhalation dosing device is used, the complete medicine supply and dosing process can be achieved once only by manually rotating a rotating cover once respectively in the first rotating direction and the second rotating direction. The dry powder inhalation dosing device can be widely suitable for the fields of design and manufacture of dry powder inhalation dosing devices of various specifications.

The invention discloses a transformer substation grounding network frequency response test device, which comprises a power supply module, a frequency generator module, a power amplification module, a voltage and current collecting module and an intelligent control module, wherein the voltage and current collecting module, the intelligent control module, the frequency generator module and the power amplification module are sequentially connected, the power supply module provides the power supply for each module of the test device, the intelligent control module controls the frequency generator module to output sine wave voltage signals at different frequencies in different times, the corresponding sine wave voltage signals are amplified and loaded onto a grounding network to be tested by the power amplification module, and then, the voltage and the current of the grounding network to be tested are collected through the voltage and current collection module, so the impedance of the grounding network to be tested under the signal loading at the different frequencies is calculated by the intelligent control module. The device can be used for conveniently testing the electric completeness of the grounding network.

The invention discloses a coal-as-fired weighing system, weighing method and checking method, and relates to the technical field of belt scales. The coal-as-fired weighing system comprises a coal conveyer trestle, a belt conveyer laid on the coal conveyer trestle, at least two electronic belt scales sequentially arranged on the belt conveyer, dischargers, a heavy-duty truck and an electronic truck balance, wherein each discharger provided with a coulter, a funnel and a coal drop pipe is arranged on the belt conveyer and located at the upstream of the at least two electronic belt scales, and the coulters of the dischargers descend to drive coal on the belt conveyer to enter the coal drop pipes and ascend to allow the coal to be continuously conveyed on the belt conveyer; the heavy-duty truck is arranged below the coal drop pipes, and the electronic truck balance is arranged on one side of the heavy-duty truck. The coal-as-fired weighing system has the advantages that the use amount of the coal as fired of a power plant can be reflected truthfully, and the coal-as-fired weighing system is easy to implement, promising in popularization prospect and good in economic benefit.

The invention relates to a method for optimizing harmonic metering characteristics of a Rogowski coil type electronic current transformer. The method includes the step of firstly, obtaining determining factors of coil inner-resistance, coil self-inductance, coil stray capacitance of a Rogowski coil; calculating the coil inner-resistance, coil self-inductance, coil stray capacitance of the Rogowskicoil according to each decision factor; and then quantitatively analyzing the influence of inherent parameters such as internal resistance, self-inductance and stray capacitance of the Rogowski coilon the harmonic transmission characteristic of the electronic transformer, providing technical support for process improvement, and carrying out process optimization t on the internal resistance, thecoil self-inductance and the coil stray capacitance according to the output characteristic under the corresponding higher harmonic condition. The inherent parameters of the Rogowski coil are optimizedthrough process improvement. The metering accuracy and reliability of the electronic current transformer can be improved when the frequency changes, the problem that inherent parameters of a Rogowskicoil affect the metering accuracy of the current transformer when the frequency changes in the prior art is solved, and the operation reliability of the current transformer in an intelligent substation is improved.

The invention discloses a fluorescence-method dissolved oxygen sensor, which comprises a measuring light path, a signal processing circuit, a shell body, an outgoing cable and a temperature sensor, wherein the measurement light path comprises a fluorescent film, an optical filter, a photoelectric detector, an excitation light source and a reference light source; the fluorescent film comprises a waterproof breathable film, a fluorescent layer and a colorless transparent glass sheet, the inner surface of the waterproof breathable film is coated with the fluorescent layer, and the colorless transparent glass sheet is bonded to the inner surface of the fluorescent layer; the fluorescent film is located at the head part of the shell body, the optical filter is located between the fluorescent film and the photoelectric detector, and the photoelectric detector is located behind the optical filter and connected with the signal processing circuit; the reference light source and the excitation light source are fixed on two sides in the shell body and are positioned on the same horizontal plane with the optical filter; and the temperature sensor is arranged on the inner wall of the shell bodyand is fixed between the optical filter and the fluorescent film. According to the fluorescence-method dissolved oxygen sensor, the fluorescent film can be prevented from falling off, much diffused light and secondary reflection are avoided, and the measurement precision and stability are improved.

A roundness measuring machine includes: a base; a table rotatable relative to the base; a probe configured to scan a surface of a workpiece mounted on the table; a motor configured to rotate the table; and a control device configured to control a rotation of the motor. The control device includes: a starting current detector configured to detect a starting current of the motor; and an acceleration/deceleration time setting unit configured to detect at least one of acceleration time and deceleration time for the motor in accordance with the starting current. The roundness measuring machine can suitably set the acceleration time and the deceleration time for the motor corresponding to the inertia moment of the workpiece mounted on the table.

A segmented Kalman filter based anti-transient-impact-vibration-interference signal processing method and system for a vortex flowmeter with a microcontroller as a core are provided, which relate to a flow rate measurement field. The method includes: (1) seeking for data segments containing transient impact vibration interferences, (2) configuring a Kalman filter, (3) implementing Kalman filtering in segments, (4) analyzing frequency domain amplitude spectrum. A vortex flow signal is predicted and estimated by the Kalman filter to achieve an objective of reducing powers and proportions of transient impact vibration interferences. Even when multiple transient impact interference components exist, and powers of these interferences are larger than the power of the vortex flow signal, the interferences can still be eliminated to correctly extract a frequency of the vortex flow signal, as well as ensuring measurement accuracy of the vortex flowmeter under complicated working process.

The invention relates to a vibrating medicine storage unit for a dry powder inhalation dosing device and belongs to the field of inhalation type dosing instruments. A turning cover, a spring, a vibration gear, a turntable and an external medicine drum arranged on a flow channel lower component form the vibrating medicine storage unit for the dry powder inhalation dosing device. While impact vibration is performed on a medicine powder storage container of the medicine storage unit, a second vibrating component, namely an internal medicine drum, which can synchronously freely vibrate, is also arranged in the medicine powder storage container, so as to perform compound vibration on medicine powder in the medicine powder storage container, so that the metering accuracy of the medicine powder dose provided by the medicine storage unit in the process of medicine dosing by the whole dry powder inhalation dosing device each time is guaranteed better, the mechanical structure design change workload needed for the variation of varieties of filling medicine powder can also be reduced, and the good adaptability of the dry powder inhalation dosing device for the powder medicine varieties in a large range is improved. The vibrating medicine storage unit can be widely suitable for the fields of design and manufacture of dry powder inhalation dosing devices of various specifications.

A differential pressure gauge includes a housing, a leaf spring having a magnetic steel, a measuring diaphragm, a helix, a dial, a range adjusting device and a diaphragm cover. The measuring diaphragm is connected with the leaf spring by connectors. The range adjusting device includes an adjusting spring provided at a lower end of the measuring diaphragm, a balance spring provided at an upper end of the measuring diaphragm, an adjusting screw and a slider which are provided at a lower end of the adjusting spring. The adjusting end of the adjusting screw is provided outside of the housing. The adjusting spring can be compressed by the upper and lower displacement of the slider driven by the adjusting screw, thus affecting the rigidity of the system to change the range of the differential pressure gauge. The differential pressure gauge facilitates adjusting the range and has the accurate measurement.

A rubber magnet (3) includes a plate-like diagonal portion (21) and a plate-like parallel portion (22) which are both magnetized in a thickness direction, the diagonal portion (21) extending in a conveyor belt width direction while linearly extending, in section in a conveyor belt length direction, from an outer side end (3b), which is closer to the front-side surface (2a), to an inner side end (3a), which is away from the front-side surface (2a), while being at an angle to the front-side surface (2a), the parallel portion (22) being formed continuously from the inner side end (3a) of the diagonal portion, so as to be arranged parallel to the front-side surface (2a).

The present invention provides an orthogonality compensation method for length measurement device, including: providing a measuring platform and a plurality of alignment marks, wherein the measuring platform comprises a chassis, a rectangular measuring table mounted on the chassis, an inspection microscope arranged above the measuring table, and a laser device mounted on the chassis and coupled to the inspection microscope; mounting the alignment marks on the measuring table and recording the coordinates of the alignment marks with respect to the coordinate system of the measuring table to provide reference coordinates; using the inspection microscope to read actual coordinates of the alignment marks with respect to the coordinate system of the measuring table and comparing the actual coordinates with the reference coordinates; and carrying out correction of coordinates if differences exist between the actual coordinates and the reference coordinates, so as to make the actual coordinates equal to the reference coordinates.

The invention discloses a water flow adjuster for an intelligent water meter. The water flow adjuster comprises a shell, a water inlet connector is arranged at a left side of the shell, a water outletconnector is arranged at an upper side, a circular cavity is arranged in the shell, an adjusting center shaft, an adjusting plate, an oscillating bar, a transmission connecting rod, an elastic waterflow baffle plate and a base block are arranged in the circular cavity; the base block is arranged at a water inlet of the water inlet connector so that the elastic water flow baffle plate can block the inlet water in a shell cavity at the outside of the elastic water flow baffle plate; an electromagnetic driving structure for driving the adjusting center shaft to rotate is arranged at the lower part of an adjusting center shaft; the adjusting center shaft drives the oscillating bar to rotate so as to drive the transmission connecting rod to move upward or pull back the elastic water flow baffle plate, and then the size of the shell cavity blocked at the outside of the elastic water flow baffle plate is changed, and the water flow can be adjusted. The metering accuracy of the intelligent water meter is guaranteed, a water source can be turned off without using an electric valve, the use is convenient, the cost is low, the water flow adjuster is energy-saving and environment-friendly, and worthy of promoting by a large margin.