CN103217252A - Movable container type high-precision micro-pressure detection device - Google Patents
Movable container type high-precision micro-pressure detection device Download PDFInfo
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- CN103217252A CN103217252A CN2013100963211A CN201310096321A CN103217252A CN 103217252 A CN103217252 A CN 103217252A CN 2013100963211 A CN2013100963211 A CN 2013100963211A CN 201310096321 A CN201310096321 A CN 201310096321A CN 103217252 A CN103217252 A CN 103217252A
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Abstract
The invention relates to a micro-pressure detection device, belongs to the detection field, and provides a movable container type high-precision micro-pressure detection device. The movable container type high-precision micro-pressure detection device is characterized in that the movable container type high-precision micro-pressure detection device comprises a fixed container and a movable container, the fixed container and the movable container are communicated through a soft pipe, the movable container is arranged on a lifting platform, the lifting platform is arranged on a lifting guide rail and is driven by a lifting screw to descend or ascend on the lifting guide rail, the lifting screw is driven by a stepping motor, a grating ruler is arranged beside the lifting platform, laser displacement meters used for metering liquid level heights are arranged on the top of the movable container and the top of the fixed container, the fixed container or the movable container is provided with a pressure connector, the stepping motor, the grating ruler and the laser displacement meters are in electric connection with a controller, and the controller comprises a pressure measurement module and a pressure control module. The grating ruler and the laser displacement meters send measured data to the pressure measurement module for micro-pressure measurement and computation, and the pressure control module is connected with the stepping motor and the pressure connector to control the pressure to be stable and starting and stopping of the stepping motor.
Description
Technical field
The present invention relates to the minute-pressure pick-up unit, relate in particular to a kind of mobile containers formula high precision minute-pressure pick-up unit.
Background technology
Micro pressure measuring is widely used in fields such as modern agriculture, manufacturing industry, pharmacy industry, transportation, space flight, aviation, national defence.In recent years, research is a lot of aspect micro-pressure measurement in the world, but mainly is straight pipe type fluid column difference formula liquid manometer and minute-pressure piston gage.The category of research also mainly concentrates on national reference level pressure gauge.And the microbarograph that is similar to working standard level and first-class gets off not have too big variation decades.The microbarograph cost of reference level is high bulky, can't be applicable to the second-class standard of One's name is legion and the transmission of quantity value of working measuring instrument.At present domestic first-class micro-pressure measurement equipment mainly is the first-class compensate-type micropressure meter of design 60～seventies, owing to exist some geneogenous shortcomings to hinder the development of micro-pressure measurement, also do not catch up with the development trend of international micro-pressure measurement, the research of therefore carrying out the microbarograph of pin-point accuracy is to be necessary very much.
The first-class compensate-type micropressure meter that uses is based on the pressure measurement principle of coming the pressure differential on two liquid levels of balance with the liquid level difference at present, mainly by greatly, small container links to each other with liquid conduits, it is poor to form liquid-column height under pressure, change the position of a movable container by rotating a screw rod that has a scale, and, make liquid level reach the equilibrium position again by observing the position of the inverted image of circular cone tip and the water surface in the container, carry out reading according to the water colunm height difference of scale correspondence.The application of compensate-type micropressure meter is very extensive, but mainly has the following disadvantages:
1. necessary manual adjustments screw mandrel, work is effort very, also can cause the wearing and tearing of screw body, and the accuracy that causes measuring reduces.
2. reading need carry out with range estimation, and its accuracy depends on the working experience of verification worker.
3. be subjected to the restriction of screw mandrel processing technology, the mechanical precision of screw mandrel is difficult to that raising is arranged again, causes the compensate-type micropressure meter accuracy of measurement further to improve.
4. in actual measurement, liquid can produce wall cling phenomenon, connects the liquid conduits compressive deformation volume of liquid is changed, owing to only observe the liquid level position of an end, volume change can cause measuring error.
5. do not have the temperature survey update the system, density of liquid and volume all can change like this, cause measuring error.
6. it is bigger to satisfy range ability, or the higher instrument of accuracy carries out verification test.
Summary of the invention
Technical matters to be solved by this invention provides a kind of mobile containers formula high precision micro pressure measuring device, solves present micro pressure measuring equipment or cost height, or the low defective of accuracy of measurement.
Technical scheme
A kind of mobile containers formula high precision minute-pressure pick-up unit, it is characterized in that: comprise the fixed container and the movable container that adopt liquid conduits to be communicated with each other, described movable container is arranged on the hoistable platform, described hoistable platform is installed on the riser guide, the lifting screw that is driven by stepper motor drives decline or rising on riser guide, at the other grating chi that is provided with of described hoistable platform, described movable container and fixed container top are provided with the laser displacement gauge of measuring liquid level, described fixed container or movable container are provided with pressure interface, described stepper motor, grating chi and laser displacement gauge are electrically connected controller, described controller comprises pressure measurement module and pressure control module, described grating chi and laser displacement gauge send counting to the pressure measurement module, carry out micro pressure measuring and calculating, described pressure control module connects stepper motor and pressure interface, the keying of the pressure stability of controlled pressure interface and control step motor.
Liquid level is provided with float in described movable container and the fixed container, and the corresponding setting with described laser displacement gauge of described float changes to detect liquid level.
Described float comprises buoyancy aid and "T"-shaped measuring head, and buoyancy aid adopts the aluminium alloy buoyancy aid, and the "T"-shaped top end face of measuring head is poly-tetrafluoro diffuse reflection plane.
Described movable container top is provided with a laser displacement gauge, is respectively arranged with a laser displacement gauge on the upper surface at the two ends, the left and right sides of described fixed container, measures the liquid level at two ends respectively.
Be equipped with temperature sensor in described fixed container, movable container and the liquid conduits, described temperature sensor all is electrically connected with controller, and described controller carries out temperature control by described temperature sensor is patrolled and examined.
Described grating chi adopts the moire frenge grating, chi.
Described fixed container is provided with pressure interface.
Be provided with pressure interface on described fixed container and the movable container.
Described riser guide is installed on the horizontal base, and described fixed container also is arranged on the described horizontal base.
A kind ofly use above-mentioned mobile containers formula high precision minute-pressure pick-up unit and carry out the device that pressure gauge detects, it is characterized in that: comprise testing pressure meter and described minute-pressure pick-up unit, be provided with pressure interface on the fixed container of described minute-pressure pick-up unit and the movable container, the pressure interface of fixed container is a test lead, the pressure interface of movable container is a reference edge, described test lead connects compression system and testing pressure meter, described compression system connects the controller of described minute-pressure pick-up unit, the pressure control module of described controller is electrically connected stepper motor and laser displacement is taken into account the grating chi, control the voltage stabilizing of described minute-pressure pick-up unit by controller, described controller links to each other with host computer, calculates and show the difference or the rate of testing pressure meter and observed pressure value.
Beneficial effect
The present invention adopts Moire fringe segmentation grating chi, accuracy of measurement reaches ± 2 μ, measure movably and the liquid level in the fixed container with two laser displacement gauges, observe the sharp position of awl and directly carry out reading with human eye with regard to not needing like this, controller adopts computer system to be made up of single-chip data acquisition device and industrial computer, the data of each sensor can be directly changed into pressure reading, also can pressure gauge be stabilized in the set pressure working point by topworks, realize measuring automatically, the present invention can remain on pressure in the fluctuation range of denier for a long time, has indispensable effect in micro-pressure measurement.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a grating measuring mechanism structure synoptic diagram of the present invention.
Fig. 3 is the optical triangulation method measuring principle synoptic diagram of laser displacement gauge of the present invention.
Fig. 4 is a float structural scheme of mechanism of the present invention.
The single unit system synoptic diagram of Fig. 5 for pressure gauge is detected.
Wherein: 1-step motor, 2-guide rail train wheel bridge, 3-lifting screw, the 4-laser displacement gauge, 5-hoistable platform, 6-grating chi, the 7-fixed guide, 8-liquid conduits, 9-fixed container, the 10-movable container, 11-buoyancy aid, 12-measuring head, the "T"-shaped top end face of 13-measuring head, 14-stablizes hook, 15-center rest, 16-pressure transmitting medium liquid level, the 17-semiconductor laser, eyeglass before the 18-laser instrument, 19-collects eyeglass, 20-CCD array, the 21-signal processor, the 22-testee, 23-test lead, 24-reference edge.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.
In view of the shortcoming of above-mentioned analysis, the present invention has designed a kind of measurement range and has been ± 8kPa, and accuracy of measurement reaches ± the micro pressure measuring device of 0.1Pa.This cover micro pressure measuring device adopts Moire fringe segmentation grating chi, and accuracy of measurement reaches ± 2 μ, is used for the measurement of movable container displacement.Measure movably and the liquid level in the fixed container with two laser displacement gauges, so just need not observe the sharp position of awl and directly carry out reading with human eye.All insert temperature sensor in each container and the pipeline and carry out temperature monitoring and correction in real time.The mobile of movable container is to drive moving up and down of container with step motor and lifting screw, the trouble of having avoided hand to change index dial.
1. one-piece construction principle
The range of the high-precision liquid micro-pressure measurement of being developed among the present invention is ± 8kPa, accuracy of measurement is ± 0.1Pa, its structural principle is similar to compensate-type micropressure meter, pressure is in respect of following several most of compositions, is respectively that container conduit, float mechanism, elevating mechanism, grating measuring mechanism, laser displacement measurement mechanism, temperature survey mechanism, pedestal, full-automatic compression system, controller are single-chip data acquisition and action executive system and industrial computer operating system.
As shown in accompanying drawing 1,1 is step motor, and 2 is the guide rail train wheel bridge, the 3rd, and lifting screw, 4 is laser displacement gauge, is separately positioned on movable container 10 and the fixed container 9, and 5 is hoistable platform, and 6 is the grating chi, and 7 is fixed guide, the 8th, liquid conduits.During practical operation, at first carry out the adjustment of zero pressure difference balance, the liquid level that is about to movable container 10 is consistent with the liquid level of fixed container 9, and respectively with grating chi 6 and laser displacement gauge 4 reading zero clearings.Calculate the position of movable container 10 according to the set pressure point that is input to computer interface, data are sent to the single-chip data acquisition and the action executive system of controller by digital communication, drive step motor 1 and rotate, drive the movable container 10 that is fixed on the hoistable platform 5 by rotation and lifting screw rod 3 and move up and down.At this moment, the grating reading head that is fixed on the movable container 10 is counted according to Moire fringe, reads the distance of actual displacement.Pressure (gas) is put in the fixed container 9, liquid is pressed into movable container 10, after waiting to stablize, be fixed on that laser displacement gauge 4 on the movable container 10 is readable to go out the float on the liquid level and the displacement of reference position, be fixed on the displacement that the laser displacement gauge 4 on the fixed container 9 is also read a liquid level simultaneously, pressure gauge just can be calculated the actual pressure of input gas according to above-mentioned three displacement meters like this.Pressure gauge is in order to guarantee that whole liquid in a temperature field much at one, adopts foamed aluminium to be incubated, and inserts a plurality of temperature sensors respectively in movable container 9, fixed container 10 and liquid conduits 8 and carry out monitoring temperature and temperature compensation.Manometric pressure reproduction calculating formula should be:
In the formula: Δ p---is the pressure differential of pressurization mouth and reference mouth, Pa;
g
l---be local gravitational acceleration;
ξ (t)---be the temperature funtion of Media density, kg/m
3/ ℃;
h
0The fluid column state of---when equating for the pressurization mouth with reference to mouth pressure is got h during use
0=0;
h
1--the liquid-column height of-real work point is poor, m;
In the above-mentioned formula, h
1=H+h
a-h
b
In the formula: the reading of H----grating chi, m;
h
a----movable/container float difference in height, and m;
h
b----fixed container float difference in height, m.
But consider that temperature variation bring some influences can for the buoyancy of float in the container, therefore:
In the formula: h
Al----reading of laser displacement gauge on the movable container, m;
V
0The immersion volume of----float when the equilibrium position, m
3
ρ
0, ρ
1Density under the temperature of-----actuating medium when balance and when measuring, kg/m
3
The external diameter of d----float, m.
Equally
In the formula: h
Bl----laser displacement gauge reading on the fixed container, m;
The buoyancy correction term of two floats is just in time offset under the uniform situation of temperature, so just produces formula:
h
1＝H+h
al-h
bl
2. grating measuring mechanism
Grating measuring mechanism adopts the moire frenge grating, chi, and the grating rule displacement sensor is made up of scale grating and grating reading head two parts.The grating rule displacement sensor is the measurement feedback assembly that utilizes the optical principle work of grating.Fixedly on the hoistable platform 5, grating reading head is contained on the grating chi anchor post scale grating, and indication grating is contained in the grating reading head.Its structure principle chart is referring to Fig. 2.The key component of grating pick-up unit is a grating reading head, and it is made up of light source, convergent lens, indication grating, photovalve and adjusting mechanism etc.This programme adopts the silicon photocell read head.It is to carry out work according to the formation principle of Moire fringe physically.
The essence of grating measuring displacement is to be that a standard ruler contraposition amount of putting is measured with grating pitch.Its signal of measuring output is digit pulse, and it is big to have sensing range, accuracy of detection height, the characteristics that response speed is fast.The general cost of high-resolution grating chi is more expensive, and makes difficulty.In order to improve systemic resolution, need segment Moire fringe, grating rule displacement sensor system adopts electronic fine-grained method at present.When two blocks of gratings are overlapping with tiny inclination angle, with the direction of grating line approximate vertical on will produce Moire fringe, along with moving of grating, Moire fringe also moves up and down thereupon.So just the measurement to grating pitch is converted to measurement to the Moire fringe number.
In a Moire fringe width, place 4 photoelectric devices according to certain intervals and just can realize electronic fine-grained and declare to function.For example, the grating chi that this programme uses, grid line be 200 lines right/the grating chi of mm, its grating pitch is 0.005mm, if just can obtain the count pulse that resolution is 1.25 μ m after adopting four segmentations, this has reached very high precision in the common observing and controlling of industry.In order to eliminate common mode interference, DC component and even-order harmonic, adopt the differential amplifier that constitutes by low drift amplifier usually.Deliver to 2 differential amplifier input ends respectively by 4 road photosignals that four photosensitive devices obtain, from its phase differential of two paths of signals of differential amplifier output is pi/2, for obtain declaring to and count pulse, need this two paths of signals is carried out shaping, at first they are shaped as the square wave that dutycycle is 1:1.Then, differentiate comparison, just can obtain the moving direction of grating chi by phase place to square wave.By square-wave pulse is counted, can obtain the displacement of grating chi.
3. laser displacement measurement mechanism (laser displacement gauge is measured float displacement, measures liquid level and changes)
Displacement measurement based on principle of triangulation is a kind of method that is widely adopted at present, this programme adopts optical triangulation method measuring principle (seeing accompanying drawing 3 for details), monochromatic light with semiconductor laser 17 penetrates focuses on the T that testee 22(is a float mechanism by the eyeglass before the laser instrument 18 " poly-tetrafluoro diffuse reflection plane, shape top).Reflected light is collected eyeglass 19 and collects, and projects on the ccd array 20; Signal processor 21 calculates light spot position on the ccd array 20 by trigonometric function and obtains distance apart from object.Its uncertainty of measurement is less than 7 μ (k=2), and measurement range is 10mm.Because fixed container 9 is arranged on the pedestal of device, for stopping the problem that possible pedestal does not measure up, a laser displacement gauge 4 and corresponding float mechanism are set respectively about fixed container 9, thus can be by calculating the elimination of level influence.
4. float mechanism
The fixed container 9 of built-in float mechanism and movable container 10 adopt the Teflon coatings, to reduce the adhesion of inner surface of container to medium, make adhesion less than the cohesion between fluid molecule like this, and liquid medium is difficult for producing wall cling phenomenon.Described float comprises buoyancy aid 11 and "T"-shaped measuring head 12, buoyancy aid 11 adopts the aluminium alloy buoyancy aid, the "T"-shaped top end face 13 of measuring head is poly-tetrafluoro diffuse reflection plane, and design stability support 15 limits float and rotates and wave, buoyancy aid 11 two ends have the gutter 14 that stretches out respectively, described gutter 14 be enclosed within the container (movable container 10 or fixed container 9) that is fixed on liquid manometer about in the vertical column of two center rests 14, described two center rests 14 vertically are arranged on to be gone up between the lower plane in the described container, described buoyancy aid 11 is symmetrical arranged with center line, "T"-shaped measuring head 12 is arranged on this center line axis of symmetry, referring to accompanying drawing 4.The laser displacement gauge 4 of container top with the plane of reflection of laser beam directive diffuse reflection surface, carries out range observation according to the corresponding different reflection angle of different distances.
5. compression system
Full-automatic compression system adopts two step motor to drive small one and large one two pressure regulators respectively, carries out pressure coarse adjustment and fine setting.The single-chip data acquisition of controller and action executive system are mainly carried out the A/D conversion by the MCS51 single-chip microcomputer to the output signal of laser displacement gauge 4, square wave to the output of grating chi is counted, the instruction of transmitting according to controller is simultaneously carried out lifting control to the step motor 1 that connects lifting screw 3, with routine inspection mode the temperature sensors that branch is located in the fixed container 9, movable container 10, liquid conduits 8 are carried out data acquisition, and send the mode of above-mentioned image data by digital communication to controller.Single Chip Microcomputer (SCM) system also adopts pid control mode that compression system is carried out Automatic Control in addition.The industrial computer operating system of controller can be set up mathematical model on computers, comprises temperature correction, density correction and the correction of float buoyancy.
Liquid manometer is a kind of very classical micro-pressure measurement equipment, and it can remain on pressure in the fluctuation range of denier for a long time, has indispensable effect in micro-pressure measurement.It is an innovative point that this project adopts the method for designing of self-poise and automatic pressurization to be applied to liquid manometer.Adopt grating chi and laser displacement gauge measuring technique to be applied to the design that liquid manometer also is a kind of novelty.Practical laser displacement gauge and grating chi, its measurement accuracy is not so good as laser interferometer, but all is being more suitable for being used for daily calibrating than laser interferometer aspect price, serviceable life, practicality and the reliability.
The measurement device accuracy of the present invention program's design can reach ± 0.1Pa, can be used as the accuracy pick-up unit of existing pressure gauge or pressure transducer etc., as shown in Figure 5.On the fixed container of this minute-pressure pick-up unit and movable container, all be provided with pressure interface, the pressure interface of fixed container is a test lead 23, the pressure interface of movable container is a reference edge 24, described test lead 23 connects compression system and testing pressure meter, described compression system connects the controller of described minute-pressure pick-up unit, the pressure control module of described controller is electrically connected stepper motor and laser displacement is taken into account the grating chi, control the voltage stabilizing of described minute-pressure pick-up unit by controller, described controller links to each other with computer system, calculate and show the difference or the rate of testing pressure meter and observed pressure value, also can design the instruction of on computer system, passing through the virtual meter panel executable operations personnel of a demonstration.
Accuracy detection to existing pressure gauge or pressure transducer can be divided into gauge pressure, differential pressure detects and absolute pressure detects.It is with atmospheric pressure as a reference that gauge pressure, differential pressure detect, so reference edge 24 directly connects atmospheric pressure, and test lead 23 connection compression system and testing pressure meters (referring to Fig. 5).When absolute pressure detected, reference edge 24 and test lead 23 all need be dredged empty state to quite approaching zero absolute pressure, and test lead 23 links to each other with the pressure control module and the testing pressure meter of compression system and controller, carried out absolute pressure and regulated and measure.
Described controller can drive step motor and carry out pressure survey until the spot pressure of setting, the also mode controlled pressure generating means that can regulate by PID according to the position of float, pressure stability is being provided with on the working point, also can both combinations, accurately controlled pressure is stable.The control system of controller is made up of single-chip data acquisition device and industrial computer, the data of each sensor can be directly changed into pressure reading, also can pressure gauge be stabilized in the set pressure working point by topworks, realizes measuring automatically.
The development of this project has been created necessary condition to the research of minute-pressure piston gage from now on, can transmit useful area or carry out the checking research work that pressure magnitude reappears to the minute-pressure piston gage.Be subjected to all restrictions of length metering aspect for a long time, seldom there is the very strong microbarograph product of high accuracy and practicality to come out, the change of remoulding oneself thoroughly has been carried out in the development of this project to traditional liquid microbarograph, filled up the blank of electric measuring type compensatory pressure meter, its mentality of designing, computation model and error correcting method also are a kind of brand-new thinkings simultaneously.Sustainable development to the micro-pressure measurement cause of China is significant.
Claims (10)
1. mobile containers formula high precision minute-pressure pick-up unit, it is characterized in that: comprise the fixed container and the movable container that adopt liquid conduits to be communicated with each other, described movable container is arranged on the hoistable platform, described hoistable platform is installed on the riser guide, the lifting screw that is driven by stepper motor drives decline or rising on riser guide, at the other grating chi that is provided with of described hoistable platform, described movable container and fixed container top are provided with the laser displacement gauge of measuring liquid level, described fixed container or movable container are provided with pressure interface, described stepper motor, grating chi and laser displacement gauge are electrically connected controller, described controller comprises pressure measurement module and pressure control module, described grating chi and laser displacement gauge send counting to the pressure measurement module, carry out micro pressure measuring and calculating, described pressure control module connects stepper motor and pressure interface, the keying of the pressure stability of controlled pressure interface and control step motor.
2. mobile containers formula high precision minute-pressure pick-up unit as claimed in claim 1 is characterized in that: liquid level is provided with float in described movable container and the fixed container, and the corresponding setting with described laser displacement gauge of described float changes to detect liquid level.
3. mobile containers formula high precision minute-pressure pick-up unit as claimed in claim 2, it is characterized in that: described float comprises buoyancy aid and "T"-shaped measuring head, and buoyancy aid adopts the aluminium alloy buoyancy aid, and the "T"-shaped top end face of measuring head is poly-tetrafluoro diffuse reflection plane.
4. mobile containers formula high precision minute-pressure pick-up unit as claimed in claim 1 or 2, it is characterized in that: described movable container top is provided with a laser displacement gauge, be respectively arranged with a laser displacement gauge on the upper surface at the two ends, the left and right sides of described fixed container, measure the liquid level at two ends respectively.
5. mobile containers formula high precision minute-pressure pick-up unit as claimed in claim 1, it is characterized in that: be equipped with temperature sensor in described fixed container, movable container and the liquid conduits, described temperature sensor all is electrically connected with controller, and described controller carries out temperature control by described temperature sensor is patrolled and examined.
6. mobile containers formula high precision minute-pressure pick-up unit as claimed in claim 1 is characterized in that: described grating chi adopts the moire frenge grating, chi.
7. mobile containers formula high precision minute-pressure pick-up unit as claimed in claim 1, it is characterized in that: described fixed container is provided with pressure interface.
8. mobile containers formula high precision minute-pressure pick-up unit as claimed in claim 1 is characterized in that: be provided with pressure interface on described fixed container and the movable container.
9. mobile containers formula high precision minute-pressure pick-up unit as claimed in claim 1, it is characterized in that: described riser guide is installed on the horizontal base, and described fixed container also is arranged on the described horizontal base.
10. use the device that mobile containers formula high precision minute-pressure pick-up unit as claimed in claim 1 carries out the pressure gauge detection for one kind, it is characterized in that: comprise testing pressure meter and described minute-pressure pick-up unit, be provided with pressure interface on the fixed container of described minute-pressure pick-up unit and the movable container, the pressure interface of fixed container is a test lead, the pressure interface of movable container is a reference edge, described test lead connects compression system and testing pressure meter, described compression system connects the controller of described minute-pressure pick-up unit, the pressure control module of described controller is electrically connected stepper motor and laser displacement is taken into account the grating chi, control the voltage stabilizing of described minute-pressure pick-up unit by controller, described controller links to each other with host computer, calculates and show the difference or the rate of testing pressure meter and observed pressure value.
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| CN103728996A (en) * | 2013-12-25 | 2014-04-16 | 合肥京东方光电科技有限公司 | Pressure controller and opening degree adjusting method thereof |
| CN104614184A (en) * | 2015-02-12 | 2015-05-13 | 广西玉柴机器股份有限公司 | Simulator in exhaust driven supercharger in simulated highland test of engine |
| CN106225885A (en) * | 2016-07-29 | 2016-12-14 | 上海航天设备制造总厂 | Liquid level sensor dynamic calibration apparatus and method |
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| CN106225885A (en) * | 2016-07-29 | 2016-12-14 | 上海航天设备制造总厂 | Liquid level sensor dynamic calibration apparatus and method |
| CN109128434A (en) * | 2018-10-09 | 2019-01-04 | 王燕蓉 | The welding method of fillet weld |
| CN109128434B (en) * | 2018-10-09 | 2022-03-29 | 王燕蓉 | Fillet weld welding method |
| CN111345790A (en) * | 2020-02-13 | 2020-06-30 | 北京信息科技大学 | Method, device and system for measuring human body pulse wave |
| CN111345790B (en) * | 2020-02-13 | 2023-03-21 | 北京信息科技大学 | Method, device and system for measuring human body pulse wave |
| CN112254870A (en) * | 2020-09-30 | 2021-01-22 | 武汉德塞仪器仪表科技有限公司 | High-precision gas micro-differential pressure gauge |
| CN112254870B (en) * | 2020-09-30 | 2022-07-05 | 武汉德塞仪器仪表科技有限公司 | High-precision gas micro-differential pressure gauge |
| CN113063544A (en) * | 2021-03-17 | 2021-07-02 | 内江市计量测试研究所 | Dynamometer calibrating device |
| CN114544078A (en) * | 2022-03-02 | 2022-05-27 | 黑龙江永创科技有限公司 | Self-calibration platform for calibrating compensation type micro-manometer and calibration method |
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