275results about How to "Avoid inaccurate measurements" patented technology

The invention provides a natural gas hydrate water discharge gas production exploitation device and an exploitation method of the natural gas hydrate water discharge gas production exploitation device, and belongs to the technical field of natural gas hydrate exploitation. A feeding cavity (12) communicated with a natural gas hydrate layer (29) is connected with an in-well gas-liquid separator (7), an exhaust cavity (8) of the in-well gas-liquid separator (7) is communicated with a gas production sleeve pipe (17), and a water discharge opening of the in-well gas-liquid separator (7) is communicated with a liquid storage cavity (2) arranged at the lower part. According to the exploitation method adopting the device, the natural gas hydrate layer (29) is firstly heated, the in-well gas-liquid separator (7) is utilized for separating gas-water mixture generated in the natural gas hydrate decomposition process, meanwhile, a liquid level monitoring device is utilized for regulating the water discharge speed of an electric submersible pump (4), and the decomposition speed of the natural gas hydrate is controlled. The device and the method have the advantages that the natural gas hydrate exploitation well liquid accumulation can be effectively prevented, the gas production efficiency is improved, the work is safe and reliable, the environment is protected, the service life is long, and the like.

The invention relates to a calibration system and method of an industrial robot workpiece coordinate system. The calibration system comprises an industrial robot, a robot controller, a robot ending tool, a sensor installation intermediate structural member, a calibration sensor assembly, a workpiece mounting table and a workpiece arranged on the workpiece mounting table. The calibration sensor assembly measures points on the workpiece, points on the characteristic curved boundary are detected, and a signal is output and then input into the robot controller; a trigger path is interrupted when the robot controller receives the signal, middle position data Fflange and displacement data Msensor in the height direction of a calibration sensor are recorded, and 6D data of the workpiece coordinate system is worked out by combining sensor mounting position data Fsensor. According to the calibration system and method of the industrial robot workpiece coordinate system, the calibration process is simple, the situation that measurement is not accurate due to the fact that a calibration plane is oblique can be avoided, the calibration precision is high, the calibration system can be applied tovarious workpiece occasions, the application cost of the calibration system is low, and achieving of large-range application and promotion is facilitated.

The invention relates to an overlong workpiece linearity detection device driven by a composite micro-feeding axis. A guide rail is fixedly connected to an experiment table lathe bed; the guide rail is connected with a sliding table in a sliding and matching mode; four laser interferometers are arranged on a test table support which is arranged on one side of the guide rail; a drive device consisting of a vertical linear motor and a horizontal linear motor is arranged on the front end surface of the sliding table; reflecting mirrors are respectively arranged on the upper side, the lower side, the left side and the right side of a rotor of the vertical linear motor; the first to fourth laser interferometers are used for respectively reflecting laser beams sent by the first to fourth laser interferometers back to the corresponding laser interferometers through the first to fourth reflecting mirrors; a data control system receives data of the laser interferometers in two directions to acquire deviation directions and deviation amount of the linearity of the guide rail in the two directions; and the data control system transmits mobile signals to a driving unit which transmits pulse signals to the vertical linear motor and the horizontal linear motor, and thus the vertical linear motor and the horizontal linear motor move to correct linearity errors in the vertical and horizontal directions.

The invention discloses a continuous measurement and monitoring system for the construction line shape of a straight bridge cantilever method, which includes a reflection target, an installation column and a laser distance measuring device; the invention also discloses a continuous monitoring method using the above monitoring system. The positions of the first reflective target and the third reflective target; the second step is to use the first laser rangefinder to measure the actual offset of the second reflective target, and the third step is to use the actual position of the second reflective target as a reference Check the horizontality and rotation angle of a laser distance measuring device; then use the second laser distance measuring device to measure the actual offset of the first reflective target and the third reflective target; stop during the walking process of the hanging basket and when it is in place , continuously monitor the offset of the hanging basket through the above steps. The invention has simple structure, is convenient for measurement and can realize continuous monitoring during the walking process of the hanging basket, and is suitable for cantilevered construction of most linear bridges.

The present invention aims at synthesizing one kind of nanometer pH sensor with embedded reference dye and sensitive dye and stable performance for non-invasive monitoring of dynamic pH variation inside cell. The preparation process includes mixing oil phase cyclohexane, surfactant Triton X-100 and co-surfactant n-hexanol and water as dispersive phase to obtain water-in-oil micro emulsion; adding mixed sensitive and reference dye liquid via stirring; adding ethyl acetate as sylylation reagent, TEOS and catalyst ammonia water to react, demulsifying with acetone, washing with absolute ethanol and super-purified water to obtain inner reference nanometer sensor with silicon shell. The inner reference nanometer sensor is used in non-invasive dynamic intracellular pH monitoring.

The invention discloses an optical current transformer based on a dual-wavelength structure. The optical current transformer comprises a first light source 1, a second light source 2, an optical fiber coupler 3, a sensor 4, a first wavelength division demultiplexer 5, a second wavelength division demultiplexer 6, a first photoelectric detector 7 and a second photoelectric detector 8, which are connected in sequence through optical fibers. The sensor 4 is internally provided with the following optical elements in sequence: a first collimator 9, a polarizer 10, a magneto-optical crystal 11, a polarization splitter prism 12, a second collimator 13 and a third collimator 14. The measurement method comprises the following steps: obtaining function relationship between the temperature and Verdet constants of the magneto-optical crystal under two different wavelengths; in the actual measuring process, obtaining rotation angles theta1 and theta2 of two polarized light beams of different wavelengths obtained after passing through the magneto-optical crystal under the effect of an external magnetic field; and carrying out calculation to obtain the temperature T and the magnetic field intensity H, and finally obtaining the measured current value according to the relation between the current I and the generated magnetic field H. Therefore, accuracy of measurement result is improved.

The invention provides a suspension rope and stable rope tension online detection device and method in vertical shaft construction. The device is mainly composed of a pressure detecting part arranged on a derrick and a steel wire rope frequency detecting part arranged on the ground of a wellhead. The pressure detecting part mainly comprises a bevel support fixed to the hoisting sheave derrick, a pressure sensor fixedly installed on the bevel of the bevel support, and a bearing pedestal fixedly connected with the pressure sensor; the steel wire rope frequency detecting part mainly comprises a frequency detecting device and a signal acquiring device used for acquiring frequency signals. The propagation frequency of vibration waves on a steel wire rope can be detected regularly through the steel wire rope frequency detecting device arranged on a well lid platform, the tension of the steel wire rope can be obtained according to the length l of the steel wire rope and the rope density rho, measurement errors caused by the upsetting moment of the bearing pedestal can be effectively avoided, and therefore the pressure sensor can be corrected. The device is simple in structure, convenient to operate, capable of performing real-time detection, easy and convenient to install, free of demolition of a stable rope and accurate in measurement and signal transmission is convenient.

The invention discloses an automatic dielectric material surface charge measuring device on the basis of a two-axis slide table, and belongs to the field of solid dielectric material surface charge measurement. The automatic dielectric material surface charge measuring device comprises the two-axis movement slide table, an electrometer probe support, a high-voltage electrode support and an upper PC (personal computer). A dielectric test specimen support is connected with the two-axis movement slide table and can be driven by the two-axis movement slide table to move in a plane; the electrometer probe support and the high-voltage electrode support are arranged in an upper space of the movement plane of the dielectric test specimen support; the upper PC is in communication connection with the two-axis movement slide table, the electrometer probe support and the high-voltage electrode support, and surface charge detection can be carried out on test specimens on the dielectric test specimen support by the two-axis movement slide table, the electrometer probe support and the high-voltage electrode support under the control of the upper PC. Compared with the prior art, the automatic dielectric material surface charge measuring device has the advantages that the automatic dielectric material surface charge measuring device is easy to operate and accurate in movement control; acquireddata can be processed in real time, and surface charge distribution conditions of materials can be visually displayed by the aid of software.

The invention discloses a method and a device for evaluating the machine vision original-value detection of the exterior corrosion appearance characteristics of a material. The evaluating method comprises the following steps: using a digital camera or a video camera to collect the exterior image information of the material and digitally processing the image; distinguishing the corrosion characteristics information of the material from the collected exterior corrosion characteristic image information of the material; improving the quality of the image through filtering, denoising, image sharpening and histogram equalization; adopting a pattern theory and an image recognition method to obtain the exterior corrosion characteristic image information of the material, and comparing the corrosion characteristics information of the material with corresponding material exterior corrosion rating standards so as to evaluate the corrosion grade of the material. The device for evaluating the machine vision original-value detection of the exterior corrosion appearance characteristics of the material comprises a light source, a sample putting platform, the digital camera, a lens or the video camera and a computer. Through the method and the device, the accuracy of corrosion characteristic detection is improved, and the error of a detection result is reduced.

The invention discloses a method for calibrating a heat flow meter method conductometer based on a guarded hot plate method, and belongs to the field of calibration of thermal conductivity measuring apparatus. The method disclosed by the invention is characterized in that a guarded hot plate method conductometer is used for measuring a thermal conductivity value of a thermal conductivity standardplate, the thermal conductivity standard plate is assigned with a value at the corresponding temperature, and then the thermal conductivity standard plate assigned with the value is put into a heat flow meter method conductometer to be calibrated to perform a calibration procedure, thereby obtaining calibration factors of the heat flow meter method conductometer at the corresponding test temperature. Thus, the defect that a heat flow meter method conductometer with a fixed structure needs to be disassembled to solely calibrate heat flow meter parts is avoided, and meanwhilefurthermore, the problem of inaccurate apparatus measurement indirectly caused by disassembling the conductometer is avoided.

The invention relates to a voltage measuring circuit, method and equipment. A to-be-measured conductor is electrically coupled to the voltage measuring circuit by adopting a first coupling device and a second coupling device, a coupling capacitor is formed between the to-be-measured conductor and the coupling devices, and when a voltage measuring device obtains a reference signal source and independently acts on the voltage measuring circuit, the first reference voltage division value at the two ends of the voltage division capacitor bank performs analysis. If the ratio of the first reference partial voltage value to the reference voltage value of the voltage measuring device does not meet the preset ratio range, the voltage measuring range (the reference voltage value) of the voltage measuring device is not matched with the measured voltage value (the first reference partial voltage value) at the moment. At the moment, the voltage measuring device changes the size of the first reference partial voltage value by adjusting the capacitance value of the partial voltage capacitor bank so as to enable the first reference partial voltage value to be matched with the reference voltage value, and therefore the problem that in the voltage measuring process, due to the fact that the measuring range is too large or too small, the measuring result is inaccurate is solved.

The invention discloses an LED street lamp with an automatic cleaning function. The LED street lamp comprises a lamp column, an LED lamp, a water storer and a water inlet valve; a nozzle is connected to the water storer through a pipe; and a water pump is arranged on the pipe. The LED street lamp further comprises a single-chip; photosensitive sensors are respectively mounted in the LED lamp and on the outer side of the LED lamp; the single-chip receives illumination intensity signals for comparison; when a difference value of two illumination intensity signals is higher than a set value, the water pump is triggered to work; a liquid level sensor is arranged in the water storer for acquiring liquid level signals in the water storer and transmitting to the single-chip; and when the liquid level is located in a set lowest level, the water inlet valve is controlled to feed water in the water storer. The LED street lamp can clean the surface under the condition of influencing normal use by floating soil on the surface thereof, can flexibly set the water spraying direction through a mode of multiple nozzles in one set, and finishes the purpose of automatic control through the single-chip control mode.

The invention provides a cow weight prediction system, which comprises the following steps of 1, obtaining three-dimensional world coordinates of scenery points through a multi-view stereoscopic vision distance measurement method; 2, calibrating a camera; establishing a relationship between a camera image pixel position and a scene point, obtaining a relationship between the three-dimensional coordinate information of the space object and the two-dimensional information of the acquired image, and further recovering information such as depth and the like missing due to acquisition by utilizingthe relationship; 3, matching feature points; carrying out similarity measurement on the SIFT feature vectors of the two images to be matched, and calculating nearest matching of each feature point ofone image in the feature point set of the other matched image; and 4, determining the body size of the dairy cow according to the obtained feature points, and obtaining a dairy cow weight predictionresult according to a preset prediction model.

The invention discloses a microcomputer automatic quasi-synchronization paralleling realization method. The method comprises following steps: step1) taking sample to obtain the sampling sequences {uG(n)} and {uX(n)} of generator voltage uG(t) and system voltage uX(t); step2) carrying out the short time Fourier transform added with discrete rectangular self convolution window to on the sampling sequence, and realtimely detecting the generator voltage and frequency, amplitude and phase angle of the system voltage; step3) calculating the voltage frequency difference, amplitude difference and angular phase difference of the parallel two sides, and carrying out the synchronous condition detection and the synchronous points forecast. The microcomputer automatic quasi-synchronization paralleling realization method has no need for taking whole period sample to paralleling voltage signal and has advantages of simple realization and less calculated amount. The method, which can do accurate measurement of the amplitude, the frequency and the phase angle for voltage signal with frequency change in large scale, can improve the reliability, accuracy and rapidity of the quasi-synchronization paralleling operation and can reduce the impact from the paralleling operation to the electrical network and the electric power device, and the method also has engineering practical value.

The present invention discloses a solid electrolyte ionic conductivity test clamp. The clamp comprises: a first clamping portion and a second clamping portion which are detachably connected and configured to clamp a solid electrolyte; and a pressure sensor configured to measure the pressure values of the first clamping portion and/or the second clamping portion for the solid electrolyte. The contact condition of the first clamping portion, the second clamping portion and the solid electrolyte is dynamically regulated according to the pressure values between the solid electrolyte and the first clamping portion and between the solid electrolyte and the second clamping portion to allow the first clamping portion and/or the second clamping portion to perform tight and uniform contact with the solid electrolyte so as to avoid the damaging caused by too large pressure of the first clamping portion and the second clamping portion for the solid electrolyte and avoid the problem that the measurement result is not accurate caused by bad contact between the solid electrolyte and the first clamping portion and between the solid electrolyte and the second clamping portion. The present invention further provides a solid electrolyte ionic conductivity test system. The present invention further provides a solid electrolyte ionic conductivity test method.

The invention provides an oxygen detector, a detection method and application. The oxygen detector comprises an air inlet provided with an oxygen permeation membrane, a heater is installed close to the air inlet, the heater is connected with a control unit, and the control unit is connected with a temperature sensor; the temperature sensor comprises a first temperature sensor mounted on the oxygenpermeation membrane and a second temperature sensor mounted in the oxygen detector and used for detecting the environment temperature; the control unit is used for receiving temperature signals of the first temperature sensor and the second temperature sensor so as to control the heater to conduct heating, and it is guaranteed that the temperature of the oxygen permeation membrane is higher thanthe environment temperature. By additionally arranging the temperature sensor, the temperature of the environment where the oxygen detector is located and the temperature of the oxygen permeation membrane can be detected, then the heater is controlled to heat the oxygen permeation membrane, the temperature of the oxygen permeation membrane is higher than the environment temperature, and thereforewater vapor is prevented from condensing on the oxygen permeation membrane.

The invention discloses a color-blindness detection device for medical use, which comprises a detection box. The bottom of the detection box is provided with evenly distributed hydraulic telescopic rods. There are two opposite telescopic rods, the telescopic rod includes an inner rod and an outer rod, one end of the bottom of the inner rod and one end of the top of the outer rod are provided with connected strip-shaped through holes, and the strip-shaped through holes on the inner rod are set through There are fixed bolts, and fixed screw rings are arranged on the fixed bolts, pin shafts are arranged at both ends of the telescopic rod, and the bottom of the detection box and the top of the supporting base are provided with movable connection seats corresponding to the telescopic rod. There are four evenly distributed guide rollers inside, and the front and back of the guide rollers are equipped with mandrels. The medical color-blindness detection device has a simple structure and more convenient operation, and effectively improves the accuracy of color-blindness detection.

The invention discloses a photoacoustic absorption cell and a synchronous online measuring device for multiple optical parameters of atmospheric particulate matters on the basis of the photoacoustic absorption cell. Absorption coefficients and scattering coefficients of the atmospheric particulate matters on the cell can be synchronously measured by the aid of the U-shaped photoacoustic absorption cell in an online manner on the basis of photoacoustic spectrum technologies and weak optical signal detection technologies, extinction coefficients and single-scattering albedo of the atmospheric particulate matters further can be obtained, and the multiple optical parameters of the particulate matters can be measured in an online manner. The photoacoustic absorption cell and the synchronous online measuring device have the advantages that the shortcomings of measurement errors due to spatial and temporal heterogeneity of samples when the samples are measured by multiple facilities or absorption coefficient measurement errors due to transmission errors during extinction and scattering synchronous measurement can be overcome, and the measurement accuracy and real-time performance of the single-scattering albedo can be effectively improved.