133results about How to "Reliable measurement method" patented technology

A 3-D morphology measuring method based on 3-D coding includes preparing N pieces of gratings, dividing said grating by check in chessboard form, projecting said grating and shooting picture then decoding said picture for obtaining actual 3-D coordinate vector of each check and carrying out stereo-matching on said 3-D coordinate vector for obtaining measurement space information.

The invention discloses a device and method for testing performance of blue light-emitting diode (LED) excitation fluorescent powder and relates to fluorescent powder. The invention provides a device and method for testing performance of blue LED excitation fluorescent powder based on an integrating sphere. The testing device is provided with a fixing base, an integrating sphere, a light outlet barrel, a blue LED light source, a TEC temperature control clamp, a constant current source, a cosine collector, a spectrograph, a computer, a baffle and a standard white board. An LED with the advantages of adjustable spectrum parameters and stable illumination serves as the excitation light source, the light rays reflected by the fluorescent powder are completely collected through the characteristic that the integrating sphere device is closed, a set of fluorescent powder performance measurement system with high applicability is provided, and important luminous performance indexes, such a luminous efficacy, external quantum efficiency and light conversion efficiency, of the fluorescent powder under the actual working conditions can be conveniently and accurately measured and analyzed; meanwhile, the LED excitation light source can be flexibly replaced in the system so as to meet the requirements of different fluorescent powder on different excitation light sources, and the system has good extension performance.

The invention provides a device and method for measuring the permeability and the elasticity modulus of anisotropic rocks. The device comprises a triaxial pressure kettle for providing different pressure, rubber sleeves for arranging cube rock cores at different azimuths, a strain gauge for measuring strains of the rock cores at different azimuths, an electromagnetic heating coil for providing different temperatures, and a gas channel and an air groove for facilitating gas transportation. The measuring device is reasonable in structure and simple in operation; the permeability and the elasticity modulus of the anisotropic rocks under the conditions of different triaxial stress and temperatures, and the permeability and the elasticity modulus of the same anisotropic rock in three directions can be measured; the anisotropy of the rocks can be better reflected; and the data measurement reasonability and accuracy of the permeability and the elasticity modulus of the anisotropic rocks are improved.

The invention belongs to the field of geometric error measurement for machine tools and relates to a method for measuring dynamic space track errors of the machine tools by means of binocular vision, in particular to a dynamic error vision measurement method for a five-axis numerical control machine tool. The measurement method includes the steps that according to a three-dimension perceptive function of binocular vision measurement, multiple errors are measured and separated at a single time; and four types of spherical mark points are reasonably distributed at a machine tool cutter end and on the surface of a working table, and the position relation among a vision coordinate system, a machine tool reference coordinate system and a machine tool cutter principal axis coordinate system is calibrated by means of feature information of the spherical mark points. During measurement, a vision measurement system continuously, statically and dynamically collects images of the spherical mark points, then moving errors of all machine tool axes are solved, and the obtained theoretical value and actual machine tool moving amount are combined, so that the moving errors of each axis are solved. According to the dynamic error vision measurement method for the five-axis numerical control machine tool, the machine tool space track errors are measured by means of a binocular high-speed camera, so that the error measurement accuracy is improved, the measurement range of the machine tool moving track is widened, the measurement method is simple and reliable, and the measurement process is simplified.

The invention discloses an optical detection method for parallelism of a planar array CCD target surface and a mounting locating surface, which relates to an optical detection method for parallelism of a CCD target surface and a mechanical mounting surface. The invention solves the problems of poor parallelism of the prior CCD mechanical mounting locating surface and CCD target surface and difficulty in realizing focal depth of the optical system, thereby influencing the CCD imaging quality. The method comprises the following steps: setting any right-angle vertex of the rectangular CCD target surface as the initial point of a rectangular coordinate system, and setting the corresponding two right-angle sides respectively as X-axis and Y-axis; and respectively reading the distance values between four vertices of the CCD target surface and the corresponding mechanical mounting surface by using a tool microscope, calculating the differences delta h between three of the four values and the initial point value, and respectively dividing by the side lengths in the X and Y directions and the distance l in the diagonal line direction, thereby respectively obtaining the included angles between the CCD target surface and the mounting locating surface in the X and Y directions and the diagonal line direction. The invention has the advantages of simple principle, high precision and easy realization.

The invention discloses a novel light-arm-amplification type high-precision length sensor and a measurement method thereof. The length sensor comprises a laser beam I, a laser beam II, a reflection component, a photoelectric detector I, a photoelectric detector II, and a processing system. To be specific, the reflection component is provided with a plurality of reflection surfaces for reflecting the laser beam I and the laser beam II; the cross section of each reflections surface is in a protruding shape; and all reflection surfaces are connected in an end-to-end mode to form a reflection surface array. The photoelectric detector I is used for receiving a laser beam after reflection of the laser beam I by the reflection component and displaying the reflection position; and the photoelectric detector II is used for receiving a laser beam after reflection of the laser beam II by the reflection component and displaying the reflection position. The processing system carried out processing according to the position changing value, received by the photoelectric detector I, of the laser beam I and the position changing value, received by the photoelectric detector II, of the laser beam II, thereby obtaining a displacement value of the measured object. The provided sensor having a simple structure is suitable for measurement of continuous changes of displacements of the measured object and has advantages of high reliability and precision and easy batch production.

The invention relates to a method for monitoring bridge health. According to the method, a plurality of plate type rubber supporting seats are adopted, wherein a force measuring element is arranged on each plate type rubber supporting seat, and comprises a plurality of optical fiber strain sensors for sensing the axial pressure and the shearing force on a corresponding supporting seat; the optical fiber strain sensors are symmetrically arranged in corresponding plate type rubber supporting seats, and are connected to an optical fiber data acquisition converter which converts an optical signal into an electric signal and displays the electric signal in the form of strain; and the average value of read numbers of the optical fiber strain sensors, which is acquired by the optical fiber data acquisition converter, is used as a final supporting seat stress strain measurement value. The invention also relates to an intelligent force-measuring supporting seat for monitoring the bridge health. According to the method and the intelligent force-measuring supporting seat for monitoring the bridge health, the stress condition of a bridge supporting seat can be accurately and effectively monitored, the shape of the supporting seat is not different from a common supporting seat, and the supporting seat can be conveniently manufactured and mounted, so that the method and the supporting seat can be used for tracking and monitoring construction loads, vehicle overload and abnormal changes of bridge performance of a bridge in real time.

The invention relates to a method for using an atomic absorption spectrometry to detect the chromium ion content in the soil. The method has the specific steps that: firstly, the invention establishes a chromium standard concentration-absorbance curve, then, the soil sample is added with the distilled water for moisturization, after that, the concentrated sulfuric acid and the concentrated phosphoric acid are used for digestion, the heating is carried out till the soil sample emits the white smoke, then the concentrated nitric acid is added till a large amount of white smoke comes out and the soil sample turns white, and the digestion liquid turns yellow green; the digestion liquid is transferred to a standard volumetric flask, the pH value is regulated to 7, 1 percent of H2SO4 - 1 percent of Na2SO4 solution is added for dilution to a standard scale, the mixture is shaken evenly and placed still till the solution is clarified, the upper layer of clear solution is taken for the measurement of the absorbance under a wavelength of 213.9nm, and the chromium ion content in the soil sample can be obtained by comparison with the established standard curve in the step a. The measurement error of the chromium ion content in the soil sample which is measured by the method of the invention is within 3 percent.

The invention relates to an FPGA-based (field programmable gate array based) signal time difference measurement method. The method includes the steps: on receiving a first signal, a slow clock signal is generated, and cycles of the slow clock signal are counted meanwhile; on receiving a second signal, a fast clock signal is generated, level of the slow clock signal is detected with a rising edge of the fast clock signal, and cycles of the fast clock signal are counted meanwhile; if changes in the level of the slow clock signal are detected with the rising edge of the fast clock signal, an identifier signal is generated, and counting the cycles of the fast clock signal and those of the slow clock signal is stopped; a time difference between the first signal and the second signal is correspondingly calculated, according to the fact that whether the level of the slow clock signal is on the rising edge or a falling edge when the identifier signal is generated and according to the cycles of the slow clock signal, the counted number of the cycles of the slow clock signal, the cycles of the fast clock signal and the counted number of the cycles of the fast clock signal. Compared with the prior art, the method has the advantage that time measurement accuracy is higher.

The invention discloses a machining method used for digital control frame cool bender, its characteristics is that it includes the following steps : A, dividing the to be processing frame curve using the constant chord length from the start point of frame machining; B, calculating the chord length Li between start point and each dividing points; C, for the frame curve divided by chord length, calculating the corresponding circular arc camber Hi at the half of the constant chord length; D, for each frame curves, calculating a group of {Li,Hi} data; E, making one group of {Li,Hi} data as the machining controlling quantity when the digital control frame cool Bender operates automatically, the Li is goal feed amount and the Hi is goal camber. The invention also discloses the machining device for realizing the processing method. The advantages of the invention are it gives the piecewise advanceable digital control frame cool bender a simple and reliable measurement method to ensuring the accuracy of frame automatic bending and shaping.

The invention relates to a measurement method of electrode current of a submerged arc furnace, and the measurement method comprises: a current transformer is connected with a voltage regulation coil of a furnace transformer for measurement to measure the three-phase current of the secondary side of the current transformer, and the vector superposition is carried out on the three-phase current of the secondary side to obtain the electrode current which enters the furnace. Therefore, the measurement method of the electrode current of the submerged arc furnace has reliability, high accuracy, low cost, simpleness and easy operation.

The invention relates to a central air conditioning charging method and charging device. The constant air volume temperature difference type central air conditioning charging method and charging device comprise the following steps: installing temperature sensors on the air inlet and the air outlet separately of every charging unit in the same central air conditioning system, at the same time testing gear state of every user's air conditioning fan by the fan state recognizing device, setting up different gear wind speeds of users' air conditioning fans to different corresponding predetermined values in advance, when the air conditioning fan is operated under a certain gear and the temperature difference of the air inlet and the air outlet reaches the initial value, fetching the predetermined value corresponding to the current gear speed of the air conditioning of user, calculating the computational energy which is consumed by the users' air conditioning fan of the charging unit according to the heat calculation formula under the constant air volume constant state, and sharing the air conditioning fees according to the proportion of the sum of computational energy of every gear of the air conditioning to the total computational energy of central air conditioning system. The measure temperatures are collected on the inlet and the outlet of air conditioning directly, which reflects the using effect better.

The invention provides a common-rail pipe pressure-limiting valve matching element pressure-holding stroke detecting device. The detecting device comprises a workbench. A valve seat positioning body is fixed to the workbench. The valve seat positioning body is internally provided with an airway of which one end is connected to an air inlet interface of the valve seat positioning body and the other end is connected to an orifice of a pressure limiting valve seat fixed to the valve seat positioning body. A flow meter is connected to the air inlet interface. The valve seat positioning body is provided with a sealing ring at the part contacting the pressure limiting valve seat. The pressure limiting valve seat is fixed to the valve seat positioning body through a fastener. A column is fixed to the workbench, a displacement measurer is fixed to the column, and a measuring rod of the displacement measurer presses a pressure limiting valve core. Further, the fastener used to fix the pressure limiting valve seat to the valve seat positioning body is a tightening cap. Further, the top of the valve seat positioning body is provided with a positioning groove, and the pressure limiting valve seat is assembled in the positioning groove. The pressure-holding stroke of a pressure-limiting valve matching element can be measured quantitatively, and the measuring method is simple, efficient, accurate and reliable.

The invention discloses a measuring method for numeric control frame cold flanging machine that includes following steps: a. the frame to be manufactured is mounted on the manufacturing device, and the three measuring probes of camber measuring mechanism are contacted with the frame to be manufactured, and the one end of the frame to be manufactured is mounted on the scooter, the distance between the first and the second measuring probes are the half of the length of the fixed chord, and the he distance between the second and the third measuring probes are the half of the length of the fixed chord; b. when feeding, the length of the chord L are calculated according to the value measured by the first and the second length coders; c. when bending, the camber H is calculated according to three grafting probes. The easy and reliable measuring method are provided for the piecewise advanceable numeric control frame cold flanging machine, and the accuracy of frame automatic bending forming can be guaranteed.

The invention discloses a method of obtaining a spectrum distribution of aerosol particles based on an integrating nephelometer. The method comprises measuring a total scattering coefficient of the aerosol at 7-170 DEG and a backscattering coefficient of the aerosol at 90-170 DEG through the integrating nephelometer, obtaining calculated values of the total scattering coefficient and the backscattering coefficient of corresponding angle ranges based on an assumption that the spectrum distribution of aerosol particles is two lognormal distribution superimpositions and a Mie scattering theory, and analyzing relative deviations of the measured values and the calculated values. A spectrum distribution with a minimum relative deviation is the spectrum distribution of the aerosol particles.

The invention discloses a transmittance spectrum measurement device and method for an ultra-narrow band filter. The device comprises a light source system, a convergent mirror, a collimating mirror, a sample holder, a light signal receiving system, a data analyzing and processing system and the like. The device is characterized in that the light source system adopts an LED light source with stable high output power, continuous emission wavelength and emission spectrum bandwidth larger than 30 nm; a laser wavelength meter with high wavelength accuracy and high spectral resolution is used as a light signal receiver, a computer is used for data analyzing and processing, and finally a transmittance spectrum curve of the ultra-narrow band filter is obtained. According to the device, the structure is simple and practical, the constructing cost is low, the measurement method is simple, convenient, reliable and rapid, compared with a conventional spectrophotometer, both the wavelength accuracy and the spectral resolution of the device are higher, the actual spectrum performance of the ultra-narrow band filter can be accurately reflected, and the device and the method are particularly suitable for spectral bandwidth measurement and central wavelength locating of the ultra-narrow band filter with the bandwidth in the range of 0.1-1 nm.

The invention discloses a method for measuring hemispherical total emissivity and heat conductivity of a large temperature difference sample. The method comprises the following steps of: heating a belt-shaped conductor sample by electrifying under a vacuum environment, and arranging a plurality of thermocouple measuring points along the axial direction of the sample; forming a sample analysis region, and measuring to get the current value and the voltage value of the analysis region; dividing the sample into a plurality of infinitesimal control bodies along the axial direction, building a steady-state energy balance equation of the infinitesimal control bodies, and respectively expressing the hemispherical total emissivity and the heat conductivity as mathematical functions about temperature; performing multiple groups of steady-state measurement experiments under different steady-state temperature conditions to form a plurality of steady-state energy balance equations; calculating the temperature distribution of each infinitesimal control body under different steady states, and the total emissivity and the heat conductivity of each infinitesimal control body under different steady-state temperature conditions. According to the method disclosed by the invention, the problem that the hemispherical total emissivity of the large temperature difference conductor material sample of which the heat conductivity is unknown cannot be measured in the prior art.

The invention relates to the field of soil corrosivity detection and analysis, specifically an in-situ soil sampling resistivity measurement device. The device is suitable for the soil in-situ resistivity analysis in the petroleum field, the petrochemical field, the power field and the building field. The device comprises an upper cover, an insulating cylinder, measurement electrodes, and a lowercover. The specific structure of the device is that the upper and lower covers are arranged in a vertically opposite manner; the insulating cylinder is disposed between the upper and lower covers; theinner wall of the insulating cylinder is oppositely provided with the stainless steel measurement electrodes. In use, the top of the insulating cylinder is provided with an auxiliary sampling device,and the auxiliary sampling device comprises a lower press rod, a supporting rod and a press ring. The lower press rod and the press ring are connected with each other through the supporting rod, andthe auxiliary sampling device applies a pressure to the insulating cylinder through the press ring. The device provided by the invention can achieve the accurate measurement of the resistivity of a to-be-detected soil layer in a non-disturbed state, is used for the in-site soil sampling, and truly reflects the soil resistivity at a sampling position.

The invention discloses an analytical method for measuring contents of iron, manganese, aluminum, titanium, nickel, calcium and magnesium in silica powder. According to the method, the weighing amount is reduced to 0.1g, complete dissolution is easily realized in the sample dissolving process, the sample dissolving time is greatly shortened, and the working efficiency is improved on the premise that the accuracy of the detection result is not influenced. According to the method, fuming perchloric acid is replaced by fuming sulfuric acid to remove silicon and fluorine, so that not only can the data accuracy be guaranteed, but also the operating safety of the method is improved. According to the method, the measurement range of all to-be-measured elements is enlarged to be 0.005-3 percent. All accurate data can be completely provided during measurement, not only can smooth production and delivery of customers be guaranteed, but also the scientific research needs of customers are met.

The invention discloses a novel small measuring range ultrahigh precision displacement sensor and a measuring method. The sensor comprises a laser beam, two reflectors, a photoelectric detector, and a processing system. According to the sensor, the laser beam is reflected continuously between the two reflectors which are paralleled arranged, and finally the laser beam irradiates at one position of the photoelectric detector; then the space between the two reflectors is changed and therefore the reflecting path of the laser beam is changed so that the laser beam irradiates at another position of the photoelectric detector. The processing system obtains a detection distance value through processing according to the two different positions, wherein the detection distance value is far more than the real change value of the space between the two reflectors; the processing system can calculate the real change value of the space between the two reflectors through the detection distance value. The sensor having a simple structure, reliable measurement and high precision can be applied in measuring continuous displacement change of objects and is easy for batch manufacture.

The invention discloses an incremental type small-measurement-range displacement sensor and a measurement method. The sensor comprises a laser beam, two reflection mirrors, a distributed type photoelectric detector and a processing system. With the adoption of the sensor, the laser beam is reflected continuously between one group of the two reflection mirrors which are arranged in parallel, and is finally illuminated to the distributed type photoelectric detector, so that the distance between the two reflection mirrors is changed, and a reflection path of the laser beam can be changed; a detection part I, a detection part II and a detection part III on the distributed type photoelectric detector are used for inducing the laser beam for three times, and the processing system is used for processing according to the number of times of receiving the laser beam by detection parts and the distance between the detection parts to obtain a detection value; the detection value is larger than a real change value of the distance between the two reflection mirrors; and the processing system can be used for calculating the real change value of the distance between the two reflection mirrors through the detection value. The sensor is simple in structure and is applicable to measurement of displacement changes of an object to be detected; and the sensor can be used for reliably measuring and has relatively high precision, and can be easily manufactured in a large batch.

The invention discloses a mounting precision detector of an infrared product. The detector is composed of detection software and a hardware system. The detection software completes infrared image collection, processing and a data analysis as well as a mounting precision result is displayed. The hardware system has a support adjusting platform; a parallel light pipe seat is arranged on the support adjusting platform; a reflection type parallel light pipe, a high precision leveling instrument and a high precision goniometer are arranged on the parallel light pipe seat; and a blackbody controller is connected with a blackbody radiation source that is correspondedly connected with a target. A target image is imaged on an infrared product by the reflection type parallel light pipe; a software system of the infrared product is driven by the computer, so that mounting is carried out; the computer reads an angle value of the high precision goniometer; and the detection software is used to compare the angle value and a result of a mounting value, so that a mounting precision value is measured. According to the invention, beneficial effects are as follows: operation is simple; mounting precision can be semi-automatically or automatically extracted; rapid, accurate and automatic measurement can be realized; and detection precision is high and the detection precision can reach 0.03 mil.

The invention discloses a device for measuring the shredding width accurately and a using method of the device. The device for measuring the shredding width accurately is simple and accurate in measurement and low in cost. The device comprises a rectangular paraffin body. The bottom face and the top face of the paraffin body are each provided with a plurality of convex teeth. Blind holes are formed in the middles of the two ends, in the length direction, of the paraffin body. According to the using method of the device, the paraffin body is placed into tobacco leaves in a feeding device of a shredder, and the length direction of the paraffin body is identical with the tobacco leaf feeding direction; after the paraffin body enters the shredder along with the tobacco leaves and is shredded, paraffin body sheets are picked up from leaf shreds, the paraffin body sheets with holes are picked up and removed, and the thicknesses of the remaining complete paraffin body sheets serve as test results; in the measuring process, the number of measuring times is not smaller than three, the number of the measured paraffin body sheets should be not smaller than nine during measurement of each time, the average value of all the measurement results is obtained as the final measurement result, and therefore the shredding width of the tobacco leaves is obtained.

The invention discloses a measurement device for the strain characteristics of a material under extreme conditions. The measurement device comprises a microcomputer terminal, a TDS-150 data acquisition instrument, a temperature and magnetic change device as well as a Dewar sleeve, a low-temperature cavity body, a sample guide pipe, a Dewar cover, a superconducting coil, a sample table joint and a sample table which are arranged in the temperature and magnetic change device, wherein the microcomputer terminal is provided with a data acquisition and analysis system; the sample guide pipe is mounted in the low-temperature cavity in the temperature and magnetic change device, the superconducting coil is mounted at the periphery of the lower part of the sample guide pipe, a shield cable joint for transmitting a strain gage electrical signal is arranged at the top end of the sample guide pipe, a sample joint is arranged at the lower part of the sample guide pipe, a sample table mounting groove is formed in the lower end of the sample joint, and a sample table is mounted in the sample table mounting groove; a magnetic control circuit is mounted on the inner wall of the low-temperature cavity; a sample mounting region, an induction module and a connecting channel are arranged on the first layer of the sample table, a heating element and a thermocouple are arranged on the second layer of the sample table, pin holes are formed in the third layer of the sample table, strain gages are arranged in the strain gage induction module, and the induction wires of the strain gages are connected to a public end. According to the measurement device, the strain characteristics of the material are measured in a plurality of physical fields.

The invention discloses a method for measuring temperature of a welding wire for laser hot wire welding. The method comprises the following steps: sending the welding wire to a base metal prewelding position at a preset wire feeding speed; heating the welding wire with preset heating current so as to enable the welding wire to generate resistance heat to enable the temperature to be increased; heating a target welding area by pulse laser with preset laser power, wherein the tail end of the welding wire is away from the center of a laser spot in a fixed distance and is heated; measuring the temperature of the welding wire within a light stop gap of the pulse laser. The method for measuring temperature of the welding wire for laser hot wire welding has the advantages of accuracy and reliability.

The invention discloses a fluorescent powder spectrum tester comprising a computer, a spectrometer and an integrating sphere (9). The fluorescent powder spectrum tester is characterized in that an LED light source (1) is arranged at the upper end of the integrating sphere (9), a TEC temperature controller is arranged at the upper end of the LED light source (1), a constant-current power line is connected with the LED light source (1) through a conductor wire (2) directly, the LED light source (1) is connected with the integrating sphere (9) through a light emitting barrel (3), a fixing device (5) is arranged at the lower end of the integrating sphere (9), fluorescent powder (7) is mounted in the fixing device (5), and a cosine collector (4) is arranged on the left side of the left wall of the integrating wall (9), and is connected with the spectrometer and the computer sequentially through an optical fiber (8). According to the full-close characteristic of the integrating sphere, wastes of light energy and influences of non-uniformity of light to test results are avoided, and light acquisition capacity of the spectrometer can be improved greatly.

The invention provides a disk-type solar concentrator focusing plane energy flow density measuring method and measuring device. A plurality of thermocouples are arranged on different positions of a focusing plane so as to obtain energy flow density values of the different positions, and the energy flow density distribution of the focusing plane is obtained. The measuring device comprises the plurality of thermocouples, a fixing device, a support, an adjusting device, a data recorder and a computer. The support is fixed on the adjusting device. The fixing device is installed on the support. The plurality of thermocouples are fixed to different positions of the fixing device, and end surfaces of temperature measuring ends of the thermocouples are superposed with the focusing plane of a disk-type solar concentrator. Temperatures measured by the thermocouples are stored to a computer for analysis through the data recorder. The disk-type solar concentrator focusing plane energy flow density measuring method and measuring device solve the problems of conventional direct measurement and indirect measurement, the energy flow density measurement of the disk-type solar concentrator focusing plane is precisely realized, the measurement precision is high, the resolution is high, the structure is simple, the flexibility is high, and the cost is low.

The invention discloses a value setting method for C reactive proteins in serum. The method comprises the following steps of (1) purification and enrichment of C reactive proteins (CRP)in serum; (2) purity detection of the C reactive proteins; (3) digestion; and (4) quantitative analysis of the C reactive proteins. The method does not need to consider the factors such as protein extraction rate, digestion efficiency and instrument stability, and only needs to consider the correctness of pure CRP concentration in the whole experiment; the used pure CRP solution is a national primary standard substance (developed by the National Institute of Measurement) which is reliable in numerical value and can be traced to an SI unit; and the raw material is nature CRP which does not need to consider the differences of structures and is more excellent than the isotope labeled whole proteins.

The invention discloses a measuring tool for the roundness of a glass circular disk and a measuring method thereof. The measuring tool comprises a standard component. Cross curves are printed on the surface of the standard component. With the midpoint of the cross curves as a circle center, a plurality of concentric circles are printed. The cross curves comprise four line segments using the midpoint as a starting point, and graduations are marked on at least one line segment. The zero point of the graduations is the midpoint of the cross curves. Compared with the prior art, a plurality of concentric circles can be printed on the standard component so as to adapt to roundness detection of glass circular disks with different specifications. A glass circular disk is placed on the standard component, and a measuring result can be read as long as the position of the glass circular disk is adjusted. The measuring method of the measuring tool is simple, convenient and reliable.

The invention provides an onsite electric testing method for important mechanical parameters of a friction type elevator system. The method comprises the steps: when a rope is not hung, an electric transmission system of a motor is precisely controlled, the motor and a roller are accelerated at a constant accelerated speed to reach a rated speed, the torque of the motor and the speed curve of the roller are recorded and the sum of rotational inertia of the motor and the roller is calculated; after the rope is hung, the system runs to and fro at the rated speed, records the torque, the speed and the running displacement and calculates a mass difference between special loads at two sides of the roller, a mass difference per unit length between a first rope and a tail rope; finally, the system is accelerated at the constant accelerated speed to reach a rated speed value, records the torque and the speed and calculates the sum of an equivalent mass of a hosting sheave or a guide sheave and an suspended mass of the elevator. The onsite electric testing method has the beneficial effects that the onsite present electric equipment is utilized to precisely detect important parameters of mechanical equipment with mass of dozens of tons and rotational inertia of hundreds of thousands kgm2; any additional equipment is not arranged and the measuring method is accurate, simple and reliable.