45results about How to "The error of the measurement result is small" patented technology

The invention relates to a measurement method of effective extracting radius of bedding boreholes based on the content of residual gas. The measurement method comprises a stepped measurement method of the content of residual gas and a grouping measurement method of the content of residual gas. The measurement method comprises the following steps: selecting districts which are simple in structure and stable in coal seam occurrence at districts to be pumped, and drilling holes; performing broaching and drilling on sampled drill holes so as to conform to stands of conventional bedding drill holes to be pumped; performing hole sealing and tube connecting extraction on drill holes to be pumped, continuously measuring extraction parameters, and after stable extraction is performed for 30 days, measuring the content of residual gas after extraction; repeating steps, measuring n groups of the content of residual gas; obtaining measurement results according to statistics, drawing a curve of results, and confirming the effective extracting radius. Through the adoption of the measurement method disclosed by the invention, the drilling difficulties are reduced, and the errors of measurement results are reduced, so that the measurement method is favorable for safety production of coal mines.

The invention provides a spectrum measuring system which mainly comprises a power source module, a light chopper, a reference sample module, a reflection module, a sample pool and a photoelectric detecting and processing unit. The power source module is used for generating monochromatic light. The light chopper is used for dividing the monochromatic light produced by the power source module into a path of reference light beam and a path of measuring light. The reference sample module comprises a reference sample pool and an attenuation slice which are arranged on the light path of the reference light in sequence. The reflection module is arranged on the light path of the measuring light so as to change the direction in which the measuring light is irradiated to a sample to be measured, and an included angle is formed between the measuring light irradiated to the sample to be measured and measuring light scattered by the sample to be measured. The sample pool is arranged on the light path of the measuring light emitted from the reflection module and used for bearing the sample to be measured. The photoelectric detecting and processing unit is used for processing the two light beams, and then an extinction spectrum and a scattered spectrum are obtained.

The invention provides a method for measuring swaying and surging information of a ship based on an optical fiber gyroscope inertial measurement system. An optical fiber strap down inertial measurement system for the ship is installed at a central position of the ship to measure the swaying and surging movements of the ship. Total displacement information is processed by using the traditional inertial measurement system and a digital filtering technology and the information of the swaying and surging translational movements is provided. The technology of the invention has the following advantages of: providing the swaying and surging information of the ship in real time combined with the digital filtering technology by using outputs of the gyroscope and an accelerometer on the optical fiber gyroscope inertial measurement system mounted on the traditional ship without increasing a new sensor under the condition of no external reference information, increasing the function of the original inertial measurement system and synchronously enhancing the measurement precision of navigation parameters of the system.

The invention provides a ship heave movement measurement method based on an optical fiber inertia measurement system, which comprises the following steps: acquiring output data of the optical fiber inertia measurement system in real time; obtaining a relation matrix of a carrier coordinate system b and a geographical coordinate system t; obtaining a relation matrix of the carrier coordinate system and a semi-fixed coordinate system; obtaining a translation acceleration of a vertical axis direction in the semi-fixed coordinate system; obtaining a speed of an Nth sampling point in the semi-fixed coordinate system; filtering the speed; and obtaining a translation displacement value of the vertical axis direction in the semi-fixed coordinate system. The invention provides ship heave movement information by using the traditional inertial measurement system through a certain measurement method, thereby increasing the maneuverability of ships and improving the content of navigation information.

The invention discloses a lower horizontal supporting structure of a nuclear power plant vapor generator. The lower horizontal supporting structure of the nuclear power plant vapor generator comprises a supporting device for preventing the vapor generator from generating instant displacement. The supporting device comprises a base and an axial clearance adjustment device arranged on the base. The base is shaped like a stepped shaft in outline, and the outer diameter of the base is gradually decreased from back to front to form a base large end and a base secondarily large end. The front section of the base large end is of a hollow structure, the inner diameter of the front section of the base large end is larger than the outer diameter of the base secondarily large end, and therefore a radius difference delta[r] is formed between the inner wall of the front section of the base large end and the outer wall of the base secondarily large end. Compared with the prior art, the lower horizontal supporting structure of the nuclear power plant vapor generator has the following effects that (1) the base with a buffering function is simple in structure, excellent in buffering performance and convenient to install and maintain, and the manufacturing and installation cost is effectively lowered; (2) clearance measurement operation is convenient and rapid, and the measurement result is small in error; and (3) clearance adjustment is more convenient, the time of clearance measurement and adjustment is effectively shortened through the structure, and the time cost and labor cost are reduced.

The invention relates to a method for measuring an effective leaf area index (LAI) of a rubber plantation by using an LAI-2000 canopy analyzer. The method comprises the following steps of: firstly measuring an A value on an open ground close to the rubber plantation to be measured, then measuring a B value of the rubber plantation and next quickly returning to the open ground to measure the A value again; exporting and saving original experimental measurement data by using software; establishing a linear interpolation equation by using measurement time and numerical values of the two A values and interpolating to generate a corresponding A value according to the measurement time of each B value; and saving an interpolation result and calculating the effective LAI by applying FV2200. According to the design of the invention, sky solar radiation changes linearly in a short time, a linear interpolation program is established according to the A value of the rubber plantation to be measured, a corresponding A value is generated for each B value, the problem of large error of the measurement result caused by use of a fixed A value in a single-probe mode of the LAI-2000 canopy analyzer is solved, the error of the measurement result is small, and the information on a vegetation canopy structure of the rubber plantation can be reflected better.

The present invention discloses a poverty deep analysis method and system. The implementation process of the method comprises the steps of: obtaining data of an administrative village, and obtaining village-level poverty indexes; obtaining data of poverty families, and obtaining family-level poverty indexes; and performing spatialization of the poverty depth: obtaining one concrete position of each poverty family through high-definition remote sensing images, associating the obtained poverty indexes with the positions of the poverty families, and obtaining a poverty family poverty depth map ofthe whole region. Compared to the prior art, the poverty deep analysis method and system can perform accurate display of the measure indexes of the poverty villages and the poverty families of the poverty region, are small in measure result error of the poverty families and the poverty villages and high in result accuracy, can present the spatial distribution case of a village-level scale, can present distribution of families, and are high in practicality, wide in application range and easy to popularize.

The invention relates to a theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method. The theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method comprises the following steps of 1, preparing a contrast sample through the processes of cutting off parts having length of L from steel wire ropes having different diameters according to a determined steel wire rope diameter scope and carrying out steel wire rope nondestructive test contrast sample preparation, 2, selecting steel wire ropes which have the same structure and length of 2 meters, cutting the selected steel wire ropes at their middle parts for same defect manufacture, and carrying out breaking force experiments respectively on the cut steel wire ropes, 3, carrying out magnetization, calibration and detection of the steel wire rope nondestructive test contrast sample obtained by the step 1 by a steel wire rope electromagnetic tester to obtain different defect detection values, and preparing a contrast sample parameter parallel table corresponding to breaking force values, and 4, determining steel wire rope detection data according to on-site detection data and the contrast sample parameter parallel table, calculating breaking force values of the detected steel wire ropes according to the steel wire rope detection data, and carrying out detection conclusion determination. The theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method is simple, can produce effects fast, and can guarantee safe and normal use of a steel wire rope according to accurate contrast of a steel wire rope nondestructive test contrast sample and a detection result.

The invention discloses a vacuum variable-temperature tube furnace, which comprises an inner glass tube and an outer glass tube. The inner glass tube and the outer glass tube form a hollow sealed cylindrical tube. A vacuum layer is reserved between the inner glass tube and the outer glass tube. An electric heating layer is coated to the outside of the inner glass tube. Electrode connecting wires penetrating through the outer glass tube are led out from two ends of the electric heating layer. A hollow area inside the inner glass tube is a heating area. The vacuum variable-temperature tube furnace is provided with the inner glass tube and the outer glass tube, the vacuum thermal-insulation layer is arranged between the inner glass tube and the outer glass tube, and accordingly samples are continuously variable in temperature and available for continuous measurement, and abrupt change of linear expansion can be conveniently observed through the transparent glass tubes. The electric heating material is coated to the inner glass tube instead of an existing resistance wire, so that the temperature field of a linear expansion coefficient measurer is even and stable, the range of obtained temperature is wide, power is only tens of watts, stability is higher, and measurement results are low in error and high in precision.

The invention provides a measuring assembly and a bucket positioning hole and a lug plate measuring device, and belongs to the field of measuring tools. The measuring assembly is used for measuring the distance between the bucket positioning hole and a lug plate and comprises a limiting rod and a measuring scale, and the cross section of the limiting rod is rectangular. The limiting rod is used for being inserted into the positioning hole so that the limiting rod is internally connected to the positioning hole; and one end of the measuring scale is used for penetrating through a pin shaft holeto abut against the limiting rod. The measuring device comprises a main beam and the two measuring assemblies. The main beam extends in the length direction of the measuring scale. The limiting rodsof the two measuring assemblies are rotatably connected with the main beam. After the measuring assembly is adopted, the problem that the circle center of the positioning hole is difficult to determine is effectively solved; and the whole measurement process is convenient to operate and the measurement result error is small.

The invention discloses a phase measuring instrument which comprises an automatic range control circuit, an A/D (analog/digital) conversion circuit, a main control circuit, a display circuit, a relay-driven circuit, a phase measuring circuit and a power circuit. An input signal passes through an input end and an output end of the to-be-measured network to form two paths of sine alternating-current signals identical in co-frequency but different in phase position through, and one path of the sine alternating-current signal is transmitted to the automatic range control circuit while the other path of the sine alternating-current signal is transmitted to the A/D conversion circuit for analog-to-digital conversion; the A/D conversion circuit transmits data subjected to conversion to the main control circuit for processing, results are transmitted to the relay-driven circuit, relay contacts are subjected to absorption and releasing operations, and gear selection of the automatic range control circuit is controlled; selection of signal range is compelted through the automatic range control circuit, the two paths of sine signals are transmitted to the phase measuring circuit to have the two paths of signals shaped, phase different signals are acquired through processing of a phase discrimination instrument and are transmitted to the main control circuit for processing, and the result is transmitted to the display circuit for displaying.

The invention provides a movable device for body fat measurement. The device comprises a shell, a display unit, a power source manager and a touch point coupled with the power source manager, wherein the touch point is configured on the shell of the movable device and made of a metal electric-conduction material; the shell is made of a non-metal electric-conduction materials; when a user presses the touch point with a certain pressure, the power source manager can apply a preset micro-current to the user; a body fat rate of the user is calculated according to electric impedance generated by the micro-current in the user's body and in combination with personal data; and the user's body fat rate is displayed on the display unit. In addition, the invention also provides a system and method for the body fat measurement. The device, system and method provided by the invention have the advantages that the body fat rate can be measured conveniently and rapidly at any time and at any place.

The invention belongs to the field of canopy saturated water vapor pressure difference calculation, and particularly relates to a greenhouse crop canopy saturated water vapor pressure difference calculation method. The method comprises the following steps: measuring air temperature, humidity and total radiation at a crop canopy height (2.0 m) in a greenhouse; calculating and obtaining the water vapor pressure depletion (VPD) of the canopy in the greenhouse; carrying out numerical simulation on the VPD by adopting a piecewise analysis method; obtaing the fitting function of saturated water vapor pressure depletion and indoor canopy solar radiation in two time periods of 0: 00-12: 00 and 12: 30-23: 30. A new method is provided for calculation of greenhouse crop canopy water vapor pressure difference, and the method has guiding significance for research on microclimate change characteristics and microclimate simulation of the sunlight greenhouse.

The invention discloses a novel pipeline fixing device and belongs to the field of structural design of fixing devices. The novel pipeline fixing device comprises a fixed shell with a testing instrument for testing flow inside, two corresponding side plates of the fixed shell are provided with openings allowing fluid pipe joints of the testing instrument to extend out, the positions of the side plates of the fixed shell 1-2 cm distant from the opening portions of the opening in the direction towards the opening are provided with two fastening slots corresponding to each other up and down, and fastening bar components are mounted in the fastening slots. The fastening bar components comprise vertical bars, two fastening bars and bolts, wherein the fastening bars are arranged on the sides of the vertical bars fixedly, and the bolts penetrate the middle of the vertical bars. The novel pipeline fixing device overcomes the problem that a fluid pipeline and a shell of the testing instrument are instable in connection and poor in fastening and consequently measurement error is large, and accordingly, connection between the fluid pipeline and the shell of the testing instrument is tightened, stability and continuity of measuring process is ensured, measurement error is reduced, and the testing instrument is protected. The novel pipeline fixing device is simple in structure, free of occupation and convenient to use.

The invention discloses a printing machine device with a measurement function. The printing machine device is characterized in that a printing machine (1), a motor (2) and a non-contact torque measurer (3) are included; the non-contact torque measurer (3) and the motor (2) are not in physical contact; and the non-contact torque measurer comprises a power source, a generator, a sensor and a transmission port. According to the technical scheme, by means of the manner of the non-contact torque measurer, the torque of the motor can be measured without utilizing an outside additional contact torque measurer, the measurement result errors are fewer, and precision is high.

The present invention discloses a method for determining density of a rubber compound or a vulcanized rubber. The method comprises the following steps: a. selecting an analytical balance with accuracy of 1:10000, an acid burette or an alkali burette for common analysis use, small scissors, and distilled water or tap water with a room temperature; b, adding a certain amount of the distilled water or the tap water to the acid burette or the alkali burette, wherein the addition amount is that the liquid level reaches an appropriate position below the maximum scale of the burette until the liquid level scale can be read, and the liquid level scale is recorded as V1 ml; c, cutting a certain amount of the rubber compound sample or the vulcanized rubber sample with the small scissors, placing the cut sample on the analytical balance with accuracy of 1:10000 to weigh, wherein the weight is recorded as M g; d, pouring the weighed sample into the burette, slightly shaking the burette to remove bubbles on the surface of the sample after the sample is stabilized below the liquid level, and accurately reading the liquid level, wherein the liquid level is recorded as V2 ml; and e, calculating density of the sample.

The invention relates to a tool for measuring the wall thickness of a casting. The tool comprises an upper base, an ejector rod, a ratchet block, a reset mechanism and a base; a stepped structure is arranged in the upper seat; the stepped structure is matched with the resetting mechanism and the ratchet block; a through hole is formed in the middle of the upper base, and the ejector rod penetratesthrough the through hole to be connected with the ratchet block; scale marks are arranged on the ejector rod; and the upper seat is buckled on the base. The tool for measuring the wall thickness of the casting overcomes the problems that in the prior art, a measuring tool cannot be directly used for measuring the interior of a cavity, and the wall thickness of the casting is not measured accurately, achieves measurement of the wall thickness of the interior of the cavity of the casting, and is small in measurement result error and convenient to use.