37results about How to "Solving accurate measurements" patented technology

This invention relates to a portable pushing car for checking railway, with such geometric parameter as railway gage, cant, triangle pit, including mechanical structure in I-shaped and three-point framework, electric source, induction testing, controlling and displaying sections. The bearing bogie structure, closing structure, hand button rod, measuring mechanism, controlling system, electric source, displaying box and various sense organs are mounted on main beam crossed on two-railway, three rollers and their mechanism which is both bearing and bogie. On one side of closing mechanism there is position closing wheel, on the other side there is retractable pressure resistant wheel used to make king piece and railway erect, and close to the inside of the railway. This advantages are light weight, stability, slight shaking and corrosion resistance.

The invention discloses an integrating sphere detector which comprises a hollow spherical shell, an incidence hole and a sampling hole. The incidence hole and the sampling hole are arranged on the hollow spherical shell. The integrating sphere detector further comprises a cooling device. The cooling device attached to outside of the hollow spherical shell is used for cooling the hollow spherical shell. The integrating sphere detector is applicable to measurement of various types of optical parameters, especially parameters of light with large divergence angle and high power, such as laser and other high-power light sources. Optical signals obtained are homogenized, and accordingly accurate measurement of optical parameters of multiple light emitters can be achieved.

The portable non-destructive plant pigment detecting system includes three wavelength spectral measurement device with oppositely set light source and detector, neutralized reference sample or leaf to be measured, micro controller connected to the light source and the detector, serial port circuit connected electrically to the micro controller, and display and keyboard connected electrically to the micro controller too. The detection method includes detecting data I0 and I, calculating the fresh leaf transmission T= I / I0 of different wavelengths, and calculating the plant pigment content ChI in the leaf in chemical metering algorithm. Compared with traditional wet chemical method, the present invention has decades times raised efficiency and no production of environment harming matter.

The invention relates to a device and method utilizing a colorimetric method to measure the ammonia content of flue gas. The device comprises a flue gas sampling temperate constant device, a flue gas absorbing and acidifying device, a flue gas liquefying and absorbing device, an absorption liquid metering device, a precise time sharing addition device, an absorption liquid mixing and color-developing device, and an absorption liquid colorimetric device. The provided method comprises the following steps: processing the ammonia in flue gas, transferring the ammonia from the gas state to the liquid state, precisely quantifying the absorption liquid, adding precisely quantified chemical reagents, developing the color in the absorption liquid colorimetric device, measuring the absorbance of color developed liquid, and finally calculating the ammonia content of flue gas according to the absorbance of color developed liquid. According to the method, the ammonia in flue gas is transferred to a liquid solution, and crystallization and adhesion of ammonia gas are avoided. The colorimetric principle is utilized, the concentration of ammonium salt in absorption liquid is measured and can be converted into the concentration of escaped ammonia in flue gas, and thus the precise measurement is achieved.

The invention relates to a digitalized measurement method and device for modulation delay of a light frequency modulator, and belongs to the technical field of photoelectric measurement. The device comprises a frequency stabilized laser, a polarizing film, a half wave plate, a light splitter, a frequency shifter, a reflector, a measured light frequency modulator, a modulation signal source, a reflector, a half-transparent and half-reflecting mirror, a polarizing film 11, a photoelectric detector, a digital oscilloscope, and an electronic computer. A measured object is the time delay between an excitation control signal of the light frequency modulator and a regulated and controlled light frequency signal. A heterodyning-type laser interferometry device is employed for obtaining laser frequency regulation and control signal waveform of the light frequency modulator, and converts a light signal into an electric signal. The method can achieve a good convergence effect, is higher in measurement accuracy, and is well adapted to the condition that the carrier is not steady and the amplitude envelope changes severely.

The present invention relates to a measuring device and method of laser vibration measuring instrument step response and belongs to the photoelectric measurement technical field. The measuring device of the present invention comprises a measured laser vibration measuring instrument, a polarizer P1, a polarizer P2, a polarizing reflector M1, a semi-transmitting and semi-reflection mirror M2, an acousto-optic modulator AOM1, an acousto-optic modulator AOM2, an FM signal source, a square wave signal source, a sinusoidal signal source, a semi-transmitting and semi-reflection mirror M3, reflectors M4, M5, M6 and M7, a semi-transmitting and semi-reflection mirror M8, a photoelectric detector and the like. Optical frequency modulation signals are down-converted into a radio frequency range through beat-frequency processing; a signal waveform sequence is obtained by means of high-speed data acquisition and quantization technologies; instantaneous frequency accurate demodulation of laser frequency modulation signal waveforms is realized through a digitization mode, so that standard motion velocity waveforms and motion acceleration waveforms can be obtained; and problems in accurate measurement and value traceability of the step response of the laser vibration measuring instrument can be solved.

The invention discloses an aerospace device structure three-dimensional thermal deformation measurement method based on finite element analysis. The method comprises the steps that a three-dimensional thermal deformation finite element model of an aerospace device structure is established; in a ground simulation environment, multi-point thermal deformation data of a spaceflight device structure and body temperature distribution physical field data of the spaceflight device structure are collected; parameters of the thermal deformation finite element model of the aerospace device structure are corrected by using data acquired in a ground simulation environment and a fitting method, and a mapping relationship between structural thermal deformation and a temperature physical field effect is established; in an on-orbit working state, a thermal deformation finite element model subjected to parameter correction is adopted, physical field data actually measured on orbit of the aerospace device structure is used as model input, and on-orbit three-dimensional thermal deformation data of the aerospace device structure are obtained. The method does not need to be matched with external high-precision geometric quantity measurement equipment in a space state, and can solve the problem of accurate measurement of deformation of large-size complex structural parts under special space environment conditions such as vacuum, weightlessness and high and low temperature.

The invention provides a method for measuring the photosynthetic rate of CAM plants. The method is based on continuous monitoring on CO2 in a large leaf chamber, the dynamic change in net CO2 exchange capacity of CAM plants is measured, and then photosynthetic characteristic indicators of CAM plants, such as the net photosynthetic rate and the CO2 absorption rate in the dark period, can be measured accordingly. The method is characterized in that the net CO2 exchange capacity is continuously measured based on the stomatal movement characteristics of CAM plants, so that the actual assimilation efficiency or the photosynthetic characteristics of CAM plants can be measured in a diurnal cycle environment or an environment where light and shade alternately change. The method for measuring photosynthetic rate is applied to not only CAM plants but also tissue-cultured plants and plants with weak photosynthesis, effectively solves the problem of accurate measurement of the photosynthetic characteristics of CAM plants, and provides a solution to measure the photosynthetic characteristics of tissue-cultured plants and plants with weak photosynthesis. The method facilitates productization and industrial production, and has good application and business prospects.

The invention discloses a liquid specific heat capacity measurement system which comprises a liquid flow circulation module, wherein the liquid flow circulation module comprises a sample container, a flow pump, a calorimeter, a cooler and an expansion box, wherein the sample container is connected with the flow pump through a conveying tube, the flow pump is connected with the calorimeter through a conveying tube, the calorimeter is connected with the cooler through a conveying tube, the cooler is connected with the expansion box through a conveying tube, the expansion box is connected with the flow pump through a conveying tube, and an electromagnetic valve is arranged on the conveying tube between the expansion box and the flow pump. The liquid specific heat capacity measurement system has the beneficial effects that the specific heat capacity of a liquid at high temperature is measured, the resolution of temperature measurement is high, the temperature control is accurate, the heat loss is reduced to the greatest extent, the uncertainty of measurement is reduced, the accuracy of a testing result is improved, and the scope of application is expanded.

The invention provides a method for adjusting a horn mouth of circle shears by applying an orthogonal method. The method comprises the following steps of: building a central line of a unit; leading two vertical lines from the central line; making an oscillating bar; fixing the oscillating bar at one side of a shear blade shaft of a left circle shear; fixing an inside micrometer at an upper end of a vertical rod of the oscillating bar; rotating the shear blade shaft of the circle shears to measure; reading and recording reading value of the inside micrometer; measuring the other side of the shear blade shaft of the circle shears and the shear blade shaft of another circle shear according to the steps; and comparing read and recorded reading values, if the reading value error of the inside micrometer is larger than a range, repeatedly measuring and adjusting until a standard error requirement is reached. By the method, a horn mouth state of two circle shears can be accurately and rapidly measured and adjusted, the problems of accurate measurement and accurate adjustment on the horn mouth state of a shear blade of a double-head circle shear are effectively solved, the shear blade is prevented from being damaged, the shearing edge quality is improved, and waste quantity and quality problem of products are reduced.

The invention belongs to the field of acoustic measurement, and specifically relates to a measuring method for the average sound absorption coefficient of a reverberation pool wall surface. The measuring method comprises the following steps: measuring standard spherical sound source radiation sound work level SWL; measuring the average sound pressure level (SPL) of a reverberation pool standard spherical sound source space; and measuring the average sound absorption coefficient of the reverberation pool wall surface. The measuring method is simple, easy in operation, obvious in experiment effect and easy to assess; compared with a method for measuring the sound absorption coefficient of a material by measuring reverberation time in a reverberation room, space average measurement is carriedout on 128 points simultaneously to obtain a measuring result, the efficiency is higher, and the uncertainty is lower; and the measuring method solves the problem of accurate measurement for the average sound absorption coefficient of the reverberation pool wall surface, so that the method is of significance in understanding the pool constant of a reverberation pool and completing the calibrationof the reverberation pool.

The invention relates to a precision assembly device and method for a hemispherical resonator gyroscope with a planar electrode structure. The method comprises the steps of obtaining a gap between a harmonic oscillator and a base electrode through a spectrum confocal sensor, and achieving the adjustment of the gap through a multi-degree-of-freedom positioning platform according to the numerical values of the gap in four directions; and obtaining the radial position deviations of the oscillator and the electrode base in the X-axis direction and the Y-axis direction through a differential capacitance detection device, feeding the radial position deviations back to a multi-axis displacement platform control system, and then achieving the function of high-precision adjustment of the radial position deviation. According to the invention, the position deviation and pitching and rolling deviation between the harmonic oscillator and the electrode base in the X, Y and Z directions can be detected and adjusted in a high-precision manner, the problems of accurate measurement and adjustment of the gap and radial position deviation between the harmonic oscillator and the base electrode of the hemispherical resonator gyroscope with the planar electrode structure are solved, the consistency of a gyroscope header is improved, the gyroscope performance is further improved, and the development requirements of a high-precision hemispherical resonator gyroscope are met.

The utility model relates to a sand mold hardness tester capable of realizing online automatic detection, belongs to the technical field of sand mold hardness testers, and solves the problems that a pressure foot of a sand mold hardness tester in the prior art is not telescopic, the accurate measurement of indentation depth cannot be realized, and the online automatic detection of sand mold hardness cannot be realized. The tester is characterized in that a displacement sensor fixing base is installed in a lower shell; a displacement sensor is installed in an inner cavity of the displacement sensor fixing base; a pressing foot is a telescopic pressing foot, a pressing head is installed in the telescopic pressing foot, the left end of the pressing head is fixedly connected with a movable iron core of the displacement sensor, and a pressing foot return spring is installed at the left end of the telescopic pressing foot. A first photoelectric switch and a second photoelectric switch are respectively arranged on upper surface of lower shell. The hardness tester has the beneficial effects that the technical problems of accurate measurement of indentation depth and telescopic pressing feet are solved, the tester is connected with a robot mechanical arm in use, automatic detection is realized under the driving of the robot mechanical arm. And the requirement for automatic production ofmetal casting products is met.

The invention discloses a ceramic pressure alarm for freeway automobile overweight, comprising a piezoelectric ceramic circuit, a rectification and storage circuit, a power amplification circuit and a measurement and indication circuit, wherein the rectification and storage circuit rectifies and stores a voltage signal generated by the piezoelectric ceramic circuit; the power amplification circuit is connected with the rectification and storage circuit; the measurement and indication circuit measures and indicates the output signal of the power amplification circuit; the piezoelectric ceramic circuit is connected with the rectification and storage circuit; the power amplification circuit is connected with the measurement and indication circuit; and the piezoelectric ceramic circuit is composed of piezoelectric ceramics PZT. The ceramic pressure alarm has the advantages of simple structure, reasonable design, low cost and good use effect, is convenient in installation and intuitional in display, is simple and feasible, can instantaneously display automobile weight, provides references for management personnel, and effectively solves the problem of accurately measuring automobile load so as to guarantee driving safety to a great degree.

The portable non-destructive plant pigment detecting system includes three wavelength spectral measurement device with oppositely set light source and detector, neutralized reference sample or leaf to be measured, micro controller connected to the light source and the detector, serial port circuit connected electrically to the micro controller, and display and keyboard connected electrically to the micro controller too. The detection method includes detecting data I0 and I, calculating the fresh leaf transmission T= I / I0 of different wavelengths, and calculating the plant pigment content ChI in the leaf in chemical metering algorithm. Compared with traditional wet chemical method, the present invention has decades times raised efficiency and no production of environment harming matter.

The invention discloses an accounting method of residue rate of large earthwork. The accounting method comprises the following steps: firstly, measuring and calculating the stacking density of muck, selecting a level ground with a flat surface inside a slag discharge field of requiring measuring the volume, digging out a pit with fixed depth; paving a plastic film in the dug pit; fully filling the dug pit by accurately metered water, so as to ensure that the water level is flush with the outer surface of the pit; and counting the net amount of the water poured into the pit. The volume of the muck is equal to the volume of the water, so that the stacking density of the muck is equal to the result of the mass of the muck divided by net weight of the water; then the residue rate is measured and calculated; the mass ratio of the residue rate is equal to the ratio of the mass of waste slag and the sum of the mass of qualified stones and the waste slag; the volume ratio of the residue rate is equal to the ratio of the volume of the waste slag and the sum of the volume of the qualified stones and the volume of the waste slag. By adopting the accounting method, the technical problem that the stacking density and the natural density of the waste slag are accurately measured by a field test measurement method so as to accurately calculate the residue rate can be solved.

The invention relates to a friction-wear test device for a double cone shaft sleeve type self-lubricating joint bearing bush. Taper corresponding sleeves separately sleeve the two cone bodies of a double cone shaft; a flange which is integrally connected with the taper sleeve and shares the same end surface is arranged on each of the taper sleeves; 3-8 through holes are uniformly distributed in each of the flanges; the inner end surfaces of the two cone shafts are in separate contact with the two end surfaces of a precise isolating sleeve; the inner diameter of the precise isolating sleeve sleeving outer side of the middle of the double cone shaft is greater than the diameter of a cylinder portion of the double cone shaft, and the outer diameter is smaller than or equal to that of a cylindrical base body of each of the taper sleeves; concentric locating sleeves are arranged on the outer peripheral surfaces of the precise isolating sleeve and taper sleeves on two sides; an axial throughhole which corresponds to the through hole of the flange of each of the taper holes and is coaxial to the same is formed in a ring-shaped body of each of the concentric locating sleeves; and a screwpenetrating through each of the through holes of the concentric locating sleeves also penetrates through the through hole on the flanges of the two cone sleeves and is fastened by a nut. The device provided by the invention not only can simulate the actual bush working condition in a bearing well, but also can change the initial working condition conveniently. After the test, the device is conveniently detached and analyzed, and can support precise detection of the test.

The invention discloses a computing method for cross circuit ungrounded fault points of parallel circuits in the technical field of power system relay protection. The computing method includes the steps: acquiring instantaneous values of voltage and current of a circuit distanced from the protection position; computing relevant parameters a1, b1, a2, b2, a3 and b3 according to cross circuit ungrounded fault conditions; computing the fault points, fault impedance, fault reactance and fault path resistance of cross circuit ungrounded faults according to the relevant parameters. Only by the aid of single-ended voltage and current of the protected circuit in the parallel circuits, the method can effectively and accurately measure the cross circuit ungrounded fault distance in the parallel transmission circuits.

The invention discloses a liquid specific heat capacity measurement system which comprises a liquid flow circulation module, wherein the liquid flow circulation module comprises a sample container, a flow pump, a calorimeter, a cooler and an expansion box, wherein the sample container is connected with the flow pump through a conveying tube, the flow pump is connected with the calorimeter through a conveying tube, the calorimeter is connected with the cooler through a conveying tube, the cooler is connected with the expansion box through a conveying tube, the expansion box is connected with the flow pump through a conveying tube, and an electromagnetic valve is arranged on the conveying tube between the expansion box and the flow pump. The liquid specific heat capacity measurement system has the beneficial effects that the specific heat capacity of a liquid at high temperature is measured, the resolution of temperature measurement is high, the temperature control is accurate, the heat loss is reduced to the greatest extent, the uncertainty of measurement is reduced, the accuracy of a testing result is improved, and the scope of application is expanded.

The invention discloses a liquid specific heat capacity measuring system and measuring method. The system comprises a power part, a preheating part, a testing part, a pressure control part, a sampling part and a data processing part, wherein the power part, the preheating part, the testing part, the pressure control part and the sampling part are sequentially connected and communicated through pipelines, and the data processing part is electrically connected with the testing part and the power part; wherein the testing part specifically comprises a heat preservation device, a testing pipeline, a heating device and cooling pipes, the heat preservation device is arranged on the testing pipeline, the heating devices are arranged on the two sides of the testing pipeline, the cooling pipes are arranged below the testing pipeline, and cooling gas is introduced into the heating devices. According to the invention, a multi-parameter and multi-channel data acquisition measurement and control technology and a real-time measurement and control and data post-processing technology are realized.

The invention relates to a large-capacitance tracing circuit and a tracing method. The large-capacitance tracing circuit is characterized by comprising a dual-path signal source U1 and U2, a null indicator, a shunt and a dual-path data acquisition system, wherein the first path of signal source U1 of the dual-path signal source is connected with a first driving and isolating circuit A1; the second path of signal source U2 is connected with a second driving and isolating circuit A2; output ends of the first driving and isolating circuit A1 and the second driving and isolating circuit A2 are connected with one end of a tested capacitor and one end of the shunt; the other end of the tested capacitor and the other end of the shunt are connected with the signal end of the null indicator; the output end of the first driving and isolating circuit A1 or the second driving and isolating circuit A2 is also connected with a reference end of the null indicator; and two paths of the dual-path data acquisition system are respectively connected onto two ends of the tested capacitor and the shunt.

The invention discloses an integrating sphere detector which comprises a hollow spherical shell, an incidence hole and a sampling hole. The incidence hole and the sampling hole are arranged on the hollow spherical shell. The integrating sphere detector further comprises a cooling device. The cooling device attached to outside of the hollow spherical shell is used for cooling the hollow spherical shell. The integrating sphere detector is applicable to measurement of various types of optical parameters, especially parameters of light with large divergence angle and high power, such as laser and other high-power light sources. Optical signals obtained are homogenized, and accordingly accurate measurement of optical parameters of multiple light emitters can be achieved.

The invention belongs to the field of acoustic measurement, and in particular relates to a method for measuring the average sound absorption coefficient of the wall of a reverberation pool, comprising the following steps: measuring the radiated sound power level SWL of a standard spherical sound source; measuring the spatial average sound pressure of a standard spherical sound source of the reverberation pool class <spl>; Measure the average sound absorption coefficient of the wall of the reverberation pool. The measurement method of the present invention is simple, easy to operate, and the experimental effect is obvious and easy to evaluate; compared with the method of measuring the sound absorption coefficient of the material by measuring the reverberation time in the reverberation chamber, the present invention simultaneously measures 128 points and performs spatial The measurement results are obtained by averaging, with higher efficiency and lower uncertainty; the invention solves the problem of accurate measurement of the average sound absorption coefficient of the reverberation pool wall, which is useful for understanding the pool constant of the reverberation pool and completing the calibration of the reverberation pool important meaning.< / spl>

The invention provides a method for adjusting a horn mouth of circle shears by applying an orthogonal method. The method comprises the following steps of: building a central line of a unit; leading two vertical lines from the central line; making an oscillating bar; fixing the oscillating bar at one side of a shear blade shaft of a left circle shear; fixing an inside micrometer at an upper end of a vertical rod of the oscillating bar; rotating the shear blade shaft of the circle shears to measure; reading and recording reading value of the inside micrometer; measuring the other side of the shear blade shaft of the circle shears and the shear blade shaft of another circle shear according to the steps; and comparing read and recorded reading values, if the reading value error of the inside micrometer is larger than a range, repeatedly measuring and adjusting until a standard error requirement is reached. By the method, a horn mouth state of two circle shears can be accurately and rapidly measured and adjusted, the problems of accurate measurement and accurate adjustment on the horn mouth state of a shear blade of a double-head circle shear are effectively solved, the shear blade is prevented from being damaged, the shearing edge quality is improved, and waste quantity and quality problem of products are reduced.

The invention discloses a distance measuring device used for measuring a to-be-measured distance between a reference end face and a measuring end face which are arranged on a to-be-measured part in parallel at an interval, wherein the device comprises a support assembly, and a measuring meter piece, a measuring lever and a meter aligning piece which are arranged on the support assembly. The support assembly is used for being positioned and supported on an installation supporting face between the reference end face and the measuring end face in the measuring process, and the first end of the support assembly is provided with a limiting end face abutting against the reference end face for limiting. The measuring lever is rotationally supported at the second end of the support assembly and comprises an abutting supporting rod and a measuring supporting rod which are arranged at an included angle, and the measuring supporting rod is used for enabling the abutting supporting rod to abut against the meter head of the measuring meter piece when abutting against the measuring end face. The meter aligning piece enables the measuring meter piece to measure a reference distance L on the measuring meter piece and then to carry out meter aligning and zero setting, so that the difference value between the to-be-measured distance of a to-be-measured part and the reference distance L is displayed through the measuring meter piece. The distance measuring device is simple in structure, simple in measuring operation, convenient to use and high in measuring precision.

The invention discloses a nuclear main pump impeller outlet pressure tapping structure for a small nuclear power station, relates to the technical field of small nuclear power station detection devices, and solves the problem that the impeller outlet pressure of a nuclear main pump of the small nuclear power station is difficult to directly measure in the prior art. The whole pressure tapping structure is composed of a pressure tapping assembly, a pressure container wall, a guide vane, an outer cylinder inlet, an inner cylinder outlet, an impeller and the like. Two pressure guiding pipes, namely the inner pressure guiding pipe and the outer pressure guiding pipe, are arranged, so that internal pressure is guided out. The internal pressure guiding pipe is connected through pipe threads with a seal, the external pressure guiding pipe is connected through welding, and the sealing performance is guaranteed. According to the nuclear main pump impeller outlet pressure tapping structure for the small nuclear power station, pressure tapping of an impeller outlet of the small nuclear power station and accurate measurement of pressure of a similar double-layer sleeve structure are guaranteed, meanwhile, welding and pipe thread connection with sealing are adopted, and the integrity of a pressure boundary structure of high-temperature and high-pressure equipment is also guaranteed.

The invention relates to a heterodyne laser interference angle vibration measuring device and method, and belongs to the technical field of photoelectric measurement. The device comprises a polarization laser (1), a spectroscope (2), a first right-angle prism (2), an acoustic-optical modulator (4), a first reflection mirror (5), a second reflection mirror (6), a second right-angle prism (7), a third reflection mirror (8), a fourth reflection mirror (9), a grating (10), a lens (12), a fifth reflection mirror (13), a sixth reflection mirror (14), a photoelectric converter (15), a data collecting system (16) and a computer (17). The heterodyne laser interference angle vibration measuring device and method is characterized in that a model segment smaller than a carrier cycle is used for digital frequency demodulation of a vibration laser Doppler signal waveform with a low signal-to-noise ratio and a non-stationary angle, and therefore an angular vibration velocity waveform and an angular vibration acceleration waveform are obtained.