34results 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 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 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.