CN103292948A - Small integration ultrasonic device for measuring pressure outside pipe with small pipe diameter - Google Patents
Small integration ultrasonic device for measuring pressure outside pipe with small pipe diameter Download PDFInfo
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Abstract
The invention relates to a small integration ultrasonic device for measuring pressure outside a pipe with a small pipe diameter. The device comprises a probe, an ultrasonic emitting circuit, a receiving circuit, a data acquisition circuit, a control and data processing unit and a special probe clamp. The probe clamp is provided with a matching circular hole for installation of the probe and a U-type groove fixed in the axis direction of the pipe and capable of achieving automatic centering, the radius of the probe clamp is the same as that of the to-be-detected pipe, and automatic centering of the probe clamp in the axis direction of the pipe is guaranteed through the U-type groove. According to the ultrasonic emitting circuit, a low resistor and a field effect tube with an ultra-high-speed voltage changing gradient are used as quick electronic switches. According to the data acquisition circuit, high-speed sampling and processing are achieved through a high-speed A/D chip, a micro controller and a hyper-synchronous FIFO chip, the micro controller is a main control chip, and special software achieving empirical mode decomposition and noise reduction, power management and multi-mode power control is solidified in the main control chip. Compared with the prior art, the device is small in size, convenient to install and use and few in safety hidden risks, power consumption of the data acquisition circuit is low, and echo signals are stable.
Description
Technical field
The invention belongs to the pressure measurement technology field, relate to a kind of ultrasonic wave duct external pressure measurement mechanism, relate in particular to a kind of small-sized integrated tubule footpath ultrasound wave measuring pressure from outside of pipe device.
Background technology
In Large-Scale Equipments such as hoisting device, reprinting transportation equipment, engineering machinery, hydraulic system is the core institution of transmission and control, pressure is directly connected to the running status of system as the important parameter of hydraulic system, and therefore detecting hydraulic system pressure is an important topic.Though diversified tensimeter is arranged on the market, mostly is insertion type and detects inconvenient operation.The ultrasound wave measuring pressure from outside of pipe relies on its non-contact measurement, easy for installation, the advantage of liquid body physics, chemistry affect not, and it is being had a extensive future aspect the engineering hydraulic machinery.The ultrasonic pressure measuring system generally is grouped into by probe, ultrasonic transmit circuit, receiving circuit, data acquisition circuit, control and data processing division, specifically as shown in Figure 1.After system starts working, produce a pulse signal stimulated emission circuit by control system, the radiating circuit operate as normal produces the high-voltage pulse signal incentive probe, the ultrasonic signal that probe sends penetrates the oil circuit tube wall, through hydraulic oil, to carry and penetrate tube wall again behind the hydraulic oil pressure force information and enter receiving circuit, echoed signal is through the receiving circuit primary treatment, by the form metering-in control system of Acquisition Circuit with digital signal, obtain the system pressure value in the certain algorithm process of the inner process of control system.There are the following problems in the prior art of the ultrasonic pressure measurement mechanism documents before the present invention:
1), " ultrasound wave measuring pressure from outside of pipe method and instrument ", the patent No. 92108777.2.Reflective measurement hydraulic system oil liquid pressure is adopted in this invention, utilize ultrasound wave in fluid velocity of propagation and the relation between the oil liquid pressure, velocity of sound propagation time difference converses force value in the mathematical model by measuring.But shortcoming such as have that measuring accuracy is poor, reaction is slow, complex operation, poor signal quality, volume are big.It is hardware, the software design idea of the ultrasound wave measuring pressure from outside of pipe instrument of core that seminar is published in that " application of single-chip microcomputer in ultrasound wave measuring pressure from outside of pipe instrument " on the 2nd phase of nineteen ninety-five " computer utility research " also only told about with 8031 single-chip microcomputers, but does not solve the problem of little Calibration.
2), " a kind of ultrasonic wave duct external pressure pick-up unit and method ", the patent No. 03114623.6.This invention comprises ultrasonic transceiver card and the data collecting card that is inserted in the Industrial Control Computer backplane slot based on isa bus, become 180 ° to be vertically mounted on the outer tube wall two straight transducers of ultrasound wave, under the control of Industrial Control Computer, gather echoed signal reflective, transmission-type respectively, and send into Industrial Control Computer and carry out analyzing and processing, finish the calculating of the time difference, pressure.This systems bulky, power consumption are big, and do not solve the problem of little Calibration." the pressure survey research of hydraulic pressure ultrasound wave tubule footpath " that seminar was published on the 7th phase in 2004 " hydraulic pressure and pneumatic " has also only proposed the thought with V-type time difference method gaging pressure.
3), engineering college of the Second Artillery Force thank build, He Li etc. is published in " the ultrasonic Manometric Studies of estimating based on the wavelet transformation time delay of little caliber " on the 6th phase in 2009 " instrumental technique and sensor ", the circulation transmission-type pressure testing system that this article has briefly introduced based on DSP and CPLD constitutes, at the deficiency that traditional time delay is estimated, proposed to estimate the computing method calculating sound time difference based on the generalized correlation time delay of wavelet transformation.But the radiating circuit in the literary composition still adopts high-pressure modular, power consumption big, and does not have the feasibility of experimental data verification method.Thank build, Li Liang etc. is published in " application of wavelet threshold denoising in ultrasonic pressure measurement Echo Processing " on the 12nd phase in 2009 " lathe and hydraulic pressure ", this article proposes also to describe in detail with the wavelet threshold denoising method echoed signal to be carried out pre-service, and The Realization of Simulation.The method that proposes in the literary composition only is a kind of of echoed signal denoising, does not have the experimental data checking.
4), the Song Shoupeng of Jiangsu University, the abundant literary composition of fault etc. are published in " the ultrasonic pipeline pressure measurement method research of non-intervention type " on the 4th phase in 2004 " sensing technology journal ", this article has been distinguished static pressure, dynamic pressure measurement model, proposes to introduce temperature compensation.But only be summary, theory property, speak of in general terms, do not consider feasibility.Ding Lijuan, Song Shoupeng etc. are published in " application of wavelet filtering in ultraphonic pipe measuring pressure from outside Echo Processing " on the 8th phase in 2008 " observation and control technology ", this article is mainly told about and is utilized wavelet filteration method that ultrasonic signal is carried out pre-service, extracting the weak echo signal in the strong noise background, only is a kind of method that echoed signal is handled.Ding Lijuan, Song Shoupeng etc. are published in " design of radiating circuit in the ultraphonic pipe measuring pressure from outside " on the 8th phase in 2009 " instrumental technique and sensor ", this article has proposed a kind of radiating circuit that utilizes inductive energy storage to produce high power pulse, this circuit is on-off element with the field effect transistor, form high-pressure sharp pulse by inductive energy storage, but evidence fet switch speed is too slow.
5), the Huang Jiaoying of BJ University of Aeronautics ﹠ Astronautics, An Chenliang etc. are published in " based on the ultrasonic non-intervention type measuring method of simple crosscorrelation " on 2009 o. 11th " observation and control technology ", this article is in order to improve the measuring accuracy of ultrasonic non-intervention type pressure measurement, propose a kind of ultrasonic delay calculating method based on the simple crosscorrelation theory, introduced the secondary correlation method.But article only is to have proposed a kind of method of calculating time-delay, does not have experimental verification.
6), University Of Science and Technology Of Shandong be published in " hydraulic line pressure non-insertion Ultrasonic Detection new technology " on the 3rd phase of calendar year 2001 " sensor technology " in wind, Cui Yuliang etc., this article has only been told about ultrasound wave measuring pressure from outside of pipe system principle.The Li Xiaobo of University Of Science and Technology Of Shandong, Wu Hao etc. are published in " based on the ultrasound wave hydraulic pressure measuring system of wavelet transformation " on the 10th phase in 2005 " hydraulic pressure and pneumatic ", this article is by the denoising Processing of wavelet transformation The Realization of Simulation to the ultrasound wave pressure measurement signal that contains noise, detect ultrasound waves comparatively accurately to the position of point, but do not have test figure checking feasibility.
7), Wu Zhiyong, the Liu Dongsheng of Ordnance Engineering College be published in " application of wavelet neural network in the hydraulic means pressure test " on the 12nd phase in 2010 " electronic measurement technique ", this article only proposes wavelet neural network is used for setting up ultrasonic pressure measurement model theoretically.
8), boilers and pressure vessel safety detection center, Jiangsu Province burnt day roc, Zhou Guoqing etc. be published in " pressure pipeline ultrasonic guided wave detection technology " on the 4th phase in 2003 " Chinese boilers and pressure vessel safety ", this article only is one piece of survey article.
9), strong, the Lin Weiguo of the local records of Beijing University of Chemical Technology's information science and technical college is published in " based on the ultrasonic wave duct external pressure of CPLD detector " on the 5th phase in 2008 " instrumental technique and sensor ", this article adopts single-chip microcomputer and CPLD to combine, by measuring the flight time of ultrasound wave in pipeline fluid, thereby record pipe inner fluid pressure, provide system works principle, hardware circuit composition, software design approach and interference protection measure etc., but do not had experimental verification.
In sum, systems bulky, the power consumption that has in the existing document is big; What have only provides system global structure figure, sets forth measuring method, and does not have the experimental data checking; What have just proposes a kind of method at the denoising of echoed signal, carries out simple emulation.All documents all do not have the small-sized integrated tubule footpath pressure survey of specific implementation hydraulic system.So far, through the retrieval to document, do not find that still a kind of volume is small and exquisite, low in energy consumption, safety coefficient big, can measure the directly ultrasound wave measuring pressure from outside of pipe device of hydraulic system pressure of tubule.
Summary of the invention
At above-mentioned prior art situation, the objective of the invention is to: a kind of many in-problem small-sized integrated tubules footpath ultrasound wave measuring pressure from outside of pipe device in the above-mentioned prior art that overcomes is provided.
Now design of the present invention and technical scheme are described below:
The small-sized integrated tubule of the present invention footpath ultrasound wave measuring pressure from outside of pipe device comprises probe, ultrasonic transmit circuit, receiving circuit, data acquisition circuit, control and data processing unit, it is characterized in that: also comprise the special probe anchor clamps; Low power dissipation design by radiating circuit, data acquisition circuit reduces system power dissipation; Reach the small and exquisite purpose of entire system structure by the integrated design of circuit, the mode of employing lithium battery power supply, reduce system interference by probe gripper design, powered battery, improve signal to noise ratio (S/N ratio), strengthen the quality of echoed signal, realize the footpath pressure survey of hydraulic system tubule.
The present invention further provides a kind of small-sized integrated tubule footpath ultrasound wave measuring pressure from outside of pipe device, it is characterized in that: described ultrasonic transmit circuit is low power dissipation design, adopt to hang down and draw source resistance R 1 and high-speed electronic switch Q1, wherein high-speed electronic switch Q1 selects the field effect transistor IRF740 of hypervelocity change in voltage gradient for use; By isolating chip Q1 low pressure input channel and high pressure output channel are effectively isolated, wherein isolating chip Q1 has high pressure suspension isolation and breech lock anti-interference function; By producing the high electric current of pulse in the inductance L 1 instantaneous discharge process of high speed turn-off energy storage ultrasonic transducer BNC is encouraged, by the parameter of adjustment inductance L 1 and the frequency of control signal, reach the resonant frequency of ultrasonic transducer BNC; The described low source resistance R 1=1 Ω 2W that draws; The change in voltage gradient dv/dt=4.0V/ns of described field effect transistor IRF740.
The present invention further provides a kind of small-sized integrated tubule footpath ultrasound wave measuring pressure from outside of pipe device, it is characterized in that: described data acquisition circuit adopts high-speed sampling and the processing based on high-speed a/d chip IC xxAD9226, microcontroller ICMSP430F1611 and supersynchronous fifo chip 72V2105; Super low-power consumption microcontroller MSP430F1611 is main control chip, is solidified with the special software that empirical modal decomposes denoising, power management and the control of multi-mode power in the chip, can make signal be able to reconstruct, realizes denoising, reduces the power consumption purpose; It is that rule of thumb mode is decomposed the eigenmode state function (IMF) of obtaining echoed signal that described empirical modal decomposes denoising, by comparative analysis, utilizes the modal components of reflected signal principal character that signal is reconstructed to realize denoising; Supersynchronous fifo chip 72V2105 builds bridge between AD9226 and MSP430F1611, makes the output data of A/D sampling need not MSP430F1611 control, directly is deposited among the 72V2105 on request.
The present invention further provides a kind of small-sized integrated tubule footpath ultrasound wave measuring pressure from outside of pipe device, it is characterized in that: the stability that adopts the design enhancing echoed signal of probe gripper; Described probe gripper is one and has the cooperation circular hole that probe is installed and the rectangular parallelepiped that is fixed in the U-shaped groove of pipeline axis direction automatic centering; The radius of U-shaped groove is identical with tested pipeline radius, and guarantees anchor clamps automatic centering on the pipeline axis direction by U-shaped groove, and the cooperation circular that probe is installed has the internal thread hole, is used for static probe.
The present invention further provides a kind of small-sized integrated tubule footpath ultrasound wave measuring pressure from outside of pipe device, it is characterized in that: device adopts lithium battery power supply, reduces power supply and disturbs; All circuit all are integrated on the circuit board, use SMD element in the circuit, make in its box that can be placed on 150mm * 100mm * 30mm, have reached the small and exquisite purpose of volume.
The superiority that the present invention compares with prior art is:
(1) radiating circuit adopts the long-time powered operation of compact lithium cell, has both reduced the volume of ultrasound wave measuring pressure from outside of pipe node, is convenient to install and use, and has also eliminated potential safety hazard;
(2) data acquisition circuit is low power dissipation design, its maximum characteristics are to adopt single super low-power consumption microcontroller MSP430F1611 as main control chip, it is extremely low in conjunction with power management function and multi-mode power control mechanism flexibly the power consumption of proving installation to be down to, and satisfies the needs that proving installation works long hours under the powered battery condition; Supersynchronous fifo chip 72V2105 has fully independently characteristic of read-write clock, make FIFO can between AD9226 and MSP430F1611, build a perfect bridge, simultaneously its have abundant control pin can with the co-ordination of A/D chip, the output data that A/D is sampled need not MSP430F1611 control and just can directly be deposited among the 72V2105 on request, MSP430F1611 only need finish incident detection and store to start and get final product this moment, in case the data storage finishes, MSP430F1611 closes the bigger A/D of power consumption and reads data among the 72V2105 alone, carry out follow-up calculating and transmission then, further reduce power consumption.
(3) all circuit all are integrated on the circuit board and use SMD element in the circuit, adopt lithium battery power supply to reduce the volume of supply module, have reached the small and exquisite purpose of volume.
(4) easy to install, the stability that guaranteed echoed signal of probe gripper in this device.
Description of drawings
Fig. 1 has children outside the state plan wave duct measuring pressure from outside structural drawing
Fig. 2 radiating circuit schematic diagram
Fig. 3 data acquisition circuit schematic diagram
Fig. 4 hydraulic system pipeline pressure survey probe clamping synoptic diagram
Fig. 5 empirical modal decomposes the denoising software flow pattern
Echoed signal before and after Fig. 6 denoising
Fig. 7 denoising back echo signal
30 groups of echo test signals of Figure 86 MPa pressure and average contrast
Fig. 9 echoed signal figure of each stage pressure of process that boosts
The local refinement figure of Figure 10 Fig. 9
Figure 11: the correlation curve of ultrasonic wave duct external pelivimetry value and standard indicating value under the different pressures condition
Embodiment
Now by reference to the accompanying drawings the specific embodiment of the present invention is described further:
Embodiment:
In order to check the feasibility of ultrasound wave measuring pressure from outside of pipe device, based on the GYZT-2 hydraulic test bench in the laboratory, to external diameter 28mm, wall thickness 3mm, the pipeline of internal diameter 22mm is measured, and during the pressurization of testing tube road binders liquid, the detected echoed signal of ultrasonic probe changes, ultrasound wave measuring pressure from outside of pipe device will be gathered echoed signal of ultrasound wave in real time, utilize embedded algorithm to carry out calculation of pressure.It is that step-length is pressurizeed that test is set with 2MPa, boost to 20MPa after, be depressurized to 0MPa more one by one.During test, each stage pressure is all gathered 30 groups of data.
Referring to Fig. 2: be the designed novel radiating circuit of the present invention, adopt to hang down and draw source resistance R 1 and have the field effect transistor IRF740 of hypervelocity change in voltage gradient as high-speed electronic switch, by high pressure suspension isolation and the anti-interference chip Q1 of breech lock low pressure input channel and high pressure output channel are effectively isolated, by the inductance L 1 of high speed turn-off energy storage, utilize the principle that produces the high electric current of pulse in the instantaneous discharge process that ultrasonic transducer is encouraged.Can be by adjusting the frequency of inductance L 1 parameter and control signal, to reach the resonant frequency of transducer.This circuit adopts the long-time powered operation of compact lithium cell, has both reduced the volume of ultrasound wave measuring pressure from outside of pipe node, is convenient to install and use, and has also eliminated potential safety hazard.
Referring to Fig. 3: a kind of high-speed sampling and the processing scheme based on high-speed a/d chip AD9226, microcontroller MSP430F1611 and supersynchronous fifo chip 72V2105 that design for the present invention.The characteristics of this scheme maximum are to adopt single super low-power consumption microcontroller MSP430F1611 as main control chip, it is extremely low in conjunction with power management function and multi-mode power control mechanism flexibly the power consumption of proving installation to be down to, and satisfies the needs that proving installation works long hours under the powered battery condition.Supersynchronous fifo chip 72V2105 has fully independently characteristic of read-write clock, make FIFO can between AD9226 and MSP430F1611, build a perfect bridge, simultaneously its have abundant control pin can with the co-ordination of A/D chip, the output data that A/D is sampled need not MSP430F1611 control and just can directly be deposited on request among the 72V2105, and MSP430F1611 only need finish incident detection and store startup and get final product this moment.In case data storages finishes, MSP430F1611 can close the bigger A/D of power consumption and read data among the 72V2105 alone, and carries out follow-up calculating and transmission, can further reduce power consumption like this.
Referring to Fig. 4: be the dedicated probe anchor clamps that the present invention designs, after probe coats couplant, along the circular hole that cooperates with probe on the anchor clamps anchor clamps of packing into.The R of U-shaped groove is fluid pressure line radius to be measured, and U-shaped groove guarantees anchor clamps automatic centering on the pipeline axis direction, and fastening bolt is used for firm clamping probe.The stability that these anchor clamps are easy to install, guaranteed echoed signal.
Referring to Fig. 5: the special software master routine figure that decomposes (EMD) denoising for the empirical modal that solidifies in the super low-power consumption microcontroller MSP430F1611 chip in the data acquisition circuit of the present invention; This program is decomposed empirical modal the echoed signal denoising that is used for the ultrasound wave measuring pressure from outside of pipe, at first utilize empirical modal to decompose the eigenmode state function (IMF) of obtaining echoed signal, by comparative analysis, utilize the modal components of reflected signal principal character that signal is reconstructed to realize denoising then.
Referring to Fig. 6,7: the special software that the empirical modal of taking to solidify in the MSP430F1611 chip for the present invention decomposes denoising is handled the design sketch before and after the denoising.Ground unrest has reduced much as can be seen.
Referring to Fig. 8: shown in be pressure 30 groups of echoed signals during picked at random when being 6MPa, ordinate 1～30 is each group signal numbering, 0 place is mean value signal.As seen each time of uniform pressure measurement result has kept good consistance.
Referring to Fig. 9,10: be depicted as different pressures condition echoed signal and local refinement contrast next time, can find out obviously that ultrasonic velocity increases in the fluid along with line pressure increases, the echo travel-time shortens gradually, and waveform moves to left one by one.
Referring to Figure 11, table 1: after an echoed signal was carried out analyzing and processing, the test result of trying to achieve under the different pressures condition was as shown in table 1, and curve plotting as shown in figure 11.
Table 1 ultrasound wave measuring pressure from outside of pipe device pressure measurements
In whole measurement range, maximum error is no more than 0.75MPa.In 6MPa～20MPa typical pressures range, relative error is no more than 8%.Such measuring accuracy can satisfy the requirement that hydraulic system detects diagnosis.
Claims (7)
1. a small-sized integrated tubule footpath ultrasound wave measuring pressure from outside of pipe device comprises probe, ultrasonic transmit circuit, receiving circuit, data acquisition circuit, control and data processing unit, it is characterized in that: also comprise the special probe anchor clamps; Described probe gripper is one and has the cooperation circular hole that probe is installed and the rectangular parallelepiped that is fixed in the U-shaped groove of pipeline axis direction automatic centering; Described ultrasonic transmit circuit adopts to hang down and draws source resistance R 1 and high-speed electronic switch Q1, and wherein high-speed electronic switch Q1 selects the field effect transistor IRF740 of hypervelocity change in voltage gradient for use; Described data acquisition circuit adopts high-speed sampling and the processing based on high-speed a/d chip IC xxAD9226, microcontroller ICMSP430F1611 and supersynchronous fifo chip 72V2105.
2. a kind of small-sized integrated tubule according to claim 1 footpath ultrasound wave measuring pressure from outside of pipe device, it is characterized in that: the radius of the U-shaped groove of described probe gripper is identical with tested pipeline radius, and guarantee anchor clamps automatic centering on the pipeline axis direction by U-shaped groove, the cooperation circular that probe is installed has the internal thread hole, is used for static probe.
3. a kind of small-sized integrated tubule according to claim 1 footpath ultrasound wave measuring pressure from outside of pipe device, it is characterized in that: described ultrasonic transmit circuit is effectively isolated low pressure input channel and high pressure output channel by isolating chip Q1; By producing the high electric current of pulse in the inductance L 1 instantaneous discharge process of high speed turn-off energy storage ultrasonic transducer BNC is encouraged, by the parameter of adjustment inductance L 1 and the frequency of control signal, reach the resonant frequency of ultrasonic transducer BNC.
4. a kind of small-sized integrated tubule according to claim 1 footpath ultrasound wave measuring pressure from outside of pipe device, it is characterized in that: the super low-power consumption microcontroller MSP430F1611 in the described data acquisition circuit is main control chip, be solidified with empirical modal in the chip and decompose the special software of denoising, power management and the control of multi-mode power, make signal be able to reconstruct, realize denoising, reduce the power consumption purpose.
5. a step according to claim 4 provides a kind of small-sized integrated tubule footpath ultrasound wave measuring pressure from outside of pipe device, it is characterized in that: it is that rule of thumb mode is decomposed the eigenmode state function (IMF) of obtaining echoed signal that described empirical modal decomposes denoising, by comparative analysis, utilize the modal components of reflected signal principal character that signal is reconstructed to realize denoising; Supersynchronous fifo chip 72V2105 builds bridge between AD9226 and MSP430F1611, makes the output data of A/D sampling need not MSP430F1611 control, directly is deposited among the 72V2105 on request.
6. a kind of small-sized integrated tubule according to claim 1 footpath ultrasound wave measuring pressure from outside of pipe device is characterized in that: the low source resistance R 1=1 Ω 2W that draws of described ultrasonic transmit circuit; The change in voltage gradient dv/dt=4.0V/ns of the field effect transistor IRF740 of described ultrasonic transmit circuit.
7. a kind of small-sized integrated tubule according to claim 1 footpath ultrasound wave measuring pressure from outside of pipe device, it is characterized in that: described device adopts lithium battery power supply; All circuit all are integrated on the circuit board, use SMD element in the circuit.
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| CN103630288A (en) * | 2013-11-28 | 2014-03-12 | 江苏大学 | Ultrasonic recycling triggered pressure measuring device and method |
| CN104568000A (en) * | 2014-12-22 | 2015-04-29 | 珠海格力电器股份有限公司 | Pipeline stress-strain information detecting method and system |
| CN104776941A (en) * | 2015-01-09 | 2015-07-15 | 济南智轩智能科技有限公司 | Adaptive amplification system for echo signal of ultrasonic heat meter |
| CN105738028A (en) * | 2016-02-01 | 2016-07-06 | 北京理工大学 | Measurement method for fluid pressure in non-intrusive pipeline |
| CN106545749A (en) * | 2016-12-20 | 2017-03-29 | 上海至纯洁净系统科技股份有限公司 | A kind of liquid source supply device |
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| CN104776941A (en) * | 2015-01-09 | 2015-07-15 | 济南智轩智能科技有限公司 | Adaptive amplification system for echo signal of ultrasonic heat meter |
| CN105738028A (en) * | 2016-02-01 | 2016-07-06 | 北京理工大学 | Measurement method for fluid pressure in non-intrusive pipeline |
| CN105738028B (en) * | 2016-02-01 | 2018-10-02 | 北京理工大学 | A kind of non-intervention type pipe fluid pressure measurement method |
| CN106545749A (en) * | 2016-12-20 | 2017-03-29 | 上海至纯洁净系统科技股份有限公司 | A kind of liquid source supply device |
| CN109900437A (en) * | 2017-12-08 | 2019-06-18 | 中国石油化工股份有限公司 | Valves leakage detection device |
| AT523420A4 (en) * | 2020-04-29 | 2021-08-15 | Johannes Kepler Univ Linz | NON-INVASIVE PRESSURE MEASUREMENT |
| AT523420B1 (en) * | 2020-04-29 | 2021-08-15 | Johannes Kepler Univ Linz | NON-INVASIVE PRESSURE MEASUREMENT |
| CN112915452A (en) * | 2021-01-27 | 2021-06-08 | 浙江工业大学 | Non-intrusive fire hydrant water pressure detection method based on multi-ultrasonic signal time delay accumulation |
| CN112915452B (en) * | 2021-01-27 | 2022-05-20 | 浙江工业大学 | Non-intrusive fire hydrant water pressure detection method based on multi-ultrasonic-signal time delay accumulation |
| CN115795282A (en) * | 2023-01-30 | 2023-03-14 | 武汉工程大学 | Shock tube dynamic pressure reconstruction method and device, electronic equipment and storage medium |
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Application publication date: 20130911 |