CN203824962U - Device for measuring material viscoelasticity by ultrasonic water washing pressure - Google Patents
Device for measuring material viscoelasticity by ultrasonic water washing pressure Download PDFInfo
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- CN203824962U CN203824962U CN201420086814.7U CN201420086814U CN203824962U CN 203824962 U CN203824962 U CN 203824962U CN 201420086814 U CN201420086814 U CN 201420086814U CN 203824962 U CN203824962 U CN 203824962U
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Abstract
The utility model discloses a device for measuring material viscoelasticity by ultrasonic water washing pressure. The device comprises a Z-axis motion and control device, a water flow pumping and water pressure control device, an ultrasonic transmitting and receiving device, an ultrasonic signal collecting device, a load measuring device and a computer. According to the device, a point focusing ultrasonic probe is used for transmitting a focusing sound beam to the surface of a material, and is controlled to move on the surface of the material along the normal direction (Z axis), and water flow with certain pressure is used to impact the surface of the material, and the water flow serves as an ultrasonic medium to collect the ultrasonic echo of the material. The viscoelasticity property of the material can be measured and estimated destructively by analyzing the amplitude information, time domain information and frequency domain information of the echo signal of the point focusing ultrasonic probe at different positions of the Z axis. The measuring device provided by the utility model is simple in structure and is suitable for measuring and analyzing the viscoelasticity of rubber-type polymers or biological soft tissues.
Description
Technical field
The utility model relates to ultrasonic detecting technology field, and particularly a kind of ultrasonic water is developed and printed and pressed the device and method of measuring material viscoelasticity.
Background technology
At material viscoelasticity, surely levy field at present, most of measurement means be all adopt coining, stretching, should press, the traditional mechanics means such as torsion.Famous INSTRON electronic universal material testing machine is to adopt coining method, determines the mechanical characteristic of material by measuring the variation relation of load and strain, but it cannot determine the viscoelasticity characteristics such as the stress relaxation, hysteresis of material.At medical domain, use flow graph can determine by loading dynamic (sine) and static load the deformation of tissue samples, thereby determine the mechanical characteristics such as modulus of shearing, hysteresis, but its size is limited.
Aspect ultrasonic material levies surely, Wang Congzhi proposes a kind of biological tissue viscoelasticity measurement method in patent 201210568367.4, by applying at tissue surface, drive excitation to form vibration, and produce shearing wave at organization internal, by measuring ultrasonic echo, analyze shear elasticity and the coefficient of viscosity that shearing wave composition can obtain tissue.
At present, for tissue, ultrasonic research of surely levying concentrates on elastogram aspect, but the analysis of elastogram has the defect that some velocities of sound are demarcated, and what most technology adopted is bulk sound velocity, be to adopt the identical velocity of sound between different tissue, this analysis for deformation is very disadvantageous.Ultrasonic material is levied the Analysis and measurement that technology concentrates on the static amount such as Young modulus, modulus of shearing surely.By a kind of technology, young modulus of material, the isoparametric mensuration of modulus of shearing can be solved, the dynamic perfromances such as its stress relaxation, creep, hysteresis can be analyzed again, all valuable for engineering analysis, medical diagnosis.
Summary of the invention
The purpose of this utility model is to provide a kind of ultrasonic water and develops and prints pressure measurement material viscoelasticity device.
It is as follows that the utility model solves the technical scheme that its technical matters adopts:
Ultrasonic water is developed and printed and is pressed a device of measuring material viscoelasticity, comprises Z axis motion and control device, current pumping and hydraulic control device, ultrasound emission and receiving trap, ultrasonic signal harvester, load measuring device, computing machine;
Z axis motion and control device comprise motion controller, grating ruler reading head, Z axis motion platform, grating scale; The motionless side of Z axis motion platform is provided with grating scale, and grating ruler reading head is arranged on platform motion side, and the signal cable of grating ruler reading head is connected on motion controller; Motion controller is connected with computing machine by USB cable; Data processing software is installed in computing machine, and the counting that the data processing software in computing machine obtains grating ruler reading head by DLL (dynamic link library) is encoded; Z axis motion platform load surface is provided with card extender, and card extender is used for installing spray water container; Described Z axis motion platform is arranged on movement platform base;
Current pumping and hydraulic control device comprise tank, water pump, proportional pressure valve, spray water container, controller of electric liquid ratio valve, pressure unit, first signal conditioning amplifier and portable data acquisition module; The input end of water pump is connected with the sidewall opening of tank by flexible pipe, and the end that pumps of water pump is connected to the input end of proportional pressure valve by flexible pipe; The output terminal of proportional pressure valve is connected to the entrance of spray water container by flexible pipe, the control end of proportional pressure valve is connected to controller of electric liquid ratio valve by cable; The sensor interface of pressure unit is arranged on spray water container, the signal output part of pressure unit is connected to the input end of first signal conditioning amplifier through cable, the output terminal of first signal conditioning amplifier is connected to an input channel of portable data acquisition module, the output channel of portable data acquisition module is connected with computing machine by USB interface, and computing machine obtains the hydraulic pressure value in spray water container;
Ultrasound emission and receiving trap comprise point focusing ultrasonic probe and ultrasound emission/receiver; Ultrasonic signal harvester comprises an analog to digital converter; The sealing of point focusing ultrasonic probe is arranged in spray water container, and the axial of point focusing ultrasonic probe overlaps with nozzle direction; Spray water container is arranged on by fixture on the card extender of Z axis motion platform load surface, and Z axis motion platform drives nozzle container and point focusing ultrasonic probe to be synchronized with the movement while moving up and down; The terminals of point focusing ultrasonic probe are connected with ultrasound emission/receiver; Signal after the conditioning of ultrasound emission/receiver inputs to analog to digital converter, and analog to digital converter accesses computing machine through pci bus, and computing machine obtains the digital signal of ultrasonic echo;
Load measuring device comprises detected materials mounting platform, pedestal, load cell, secondary signal conditioning amplifier; Pedestal is arranged on the base plate of tank, and load cell is fixed on the upper surface of pedestal, and detected materials mounting platform is placed on the test surfaces of load cell, and detected materials is fixed on detected materials mounting platform; The terminals of load cell are connected with secondary signal conditioning amplifier through cable, and the load signal amplifying through the conditioning of secondary signal conditioning amplifier enters another input channel of portable data acquisition module, and computing machine obtains load digital signal.
Described Z axis motion platform adopts linear electric motors motion platform or stepper motor to add Motion Platform of Ballscrews.
Described point focusing ultrasonic probe and spray water container need meet following requirement:
The focal length of focused ultrasonic transducer of setting up an office is f, and the ultrasound wave face angle of release that shakes is α, and f is the sound lens output face top of point focusing ultrasonic probe to the distance of focal plane; Distance between the sound lens output face top of nozzle opening position and point focusing ultrasonic probe is f/2; The openings of sizes w of nozzle is restricted to: w > f * tan α, and w > 2f * sin α.
Described motion controller is uniaxiality controller, has AB to coding reading capability, and integrated driver module; Working pressure 0.1～the 1.2MPa of proportional pressure valve; The range of load cell is 0～110N, and its working temperature is-9 ℃～60 ℃, and its linear error is in ± 3%; The range of pressure unit is 0.1～1.5MPa, and output signal is current signal 4～20mA; The centre frequency of point focusing ultrasonic probe is 5MHz, 10MHz, 15MHz or 20MHz, and focal length is greater than 10mm and is less than 20mm; The fire pulse width of ultrasound emission/receiver is that 10ns～20ms is adjustable, and reception amplifier frequency span is greater than 200MHz; Analog to digital converter gathers the signal that peak-to-peak value is 2V, and the highest sample frequency is greater than 500MHz; Portable data acquisition module has two input signal channels, and range of signal is 0～5V; The signal bandwidth of first signal conditioning amplifier is greater than 10KHz, enlargement factor be 10～2000 times adjustable; The signal bandwidth of secondary signal conditioning amplifier is greater than 5KHz, enlargement factor be 5～1000 times adjustable; The input signal of controller of electric liquid ratio valve is 4～20mA, and output current is 0～2.5A, and precision classification is greater than 128.
The utility model beneficial effect is as follows:
The utility model can be measured material thickness and ultrasonic transit time, therefore can obtain the accurate velocity of sound in material, and this lays a good foundation for further accurately measuring deformation.This programme structure is more simple in structure than traditional mechanical meaurement means, and the data that the utility model is measured not only can accurately measure the Young modulus of material, the dynamic perfromances such as stress relaxation that can also analysis of material, creep, hysteresis.Therefore, the utlity model has good application prospect.
Accompanying drawing explanation
Fig. 1 is device frame figure of the present utility model;
Fig. 2 is spray water container design size schematic diagram in the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, a kind of ultrasonic water is developed and printed and is pressed the device of measuring material viscoelasticity, comprises Z axis motion and control device, current pumping and hydraulic control device, ultrasound emission and receiving trap, ultrasonic signal harvester, load measuring device, computing machine 101;
Z axis motion and control device comprise motion controller 102, grating ruler reading head 103, Z axis motion platform 104, grating scale 105;
The motionless side of Z axis motion platform 104 is provided with grating scale 105, and grating ruler reading head 103 is arranged on platform motion side, and the signal cable of grating ruler reading head 103 is connected on motion controller 102; Motion controller 102 is connected with computing machine 101 by USB cable; In computing machine 101, data processing software is installed, the counting that the data processing software in computing machine 101 obtains grating ruler reading head 103 by DLL (dynamic link library) is encoded, thereby determines accurate movement position; Z axis motion platform 104 load surfaces are provided with card extender 121, and card extender 121 is for installing spray water container 120; Described Z axis motion platform 104 is arranged on movement platform base 106, adopts linear electric motors motion platform or stepper motor to add Motion Platform of Ballscrews;
Described data processing software comprises the parts such as user interface, data acquisition, steering logic, algorithm realization; Copyright in Computer Software name is called < < scanning ultrasonic microscope software V1.0 > >, and literary property is numbered 2012SR018842; The specific works process of data processing software is as follows: steering logic part realizes the data interaction with motion controller 102 by DLL (dynamic link library), controls accurately motion of Z axis motion platform 104, and the counting that obtains grating ruler reading head 103 is encoded; Steering logic part communicates by DLL (dynamic link library) and ultrasound emission/receiver 122 in addition, thereby reference mark focused ultrasonic transducer 119 transmits and receives ultrasound echo signal; The ultrasound echo signal that part of data acquisition is nursed one's health after amplifying through ultrasound emission/receiver 122 by the DLL (dynamic link library) collection of analog to digital converter 123, and be presented in user interface; Algorithm is realized part and is responsible for analyzing the echo data being got by part of data acquisition, and according to Correlation method for data processing method and computing formula in the present embodiment, calculates the parameter of required measurement, and informs user's operation result by user interface.
Current pumping and hydraulic control device comprise tank 109, water pump 116, proportional pressure valve 115, spray water container 120, controller of electric liquid ratio valve 127, pressure unit 118, first signal conditioning amplifier 124 and portable data acquisition module 126;
The input end of water pump 116 is connected with the sidewall opening of tank 109 by flexible pipe 110, and the end that pumps of water pump 116 is connected to the input end of proportional pressure valve 115 by flexible pipe; The output terminal of proportional pressure valve 115 is connected to the entrance 117 of spray water container 120 by flexible pipe, the control end of proportional pressure valve 115 is connected to controller of electric liquid ratio valve 127 by cable; The sensor interface of pressure unit 118 is arranged on spray water container 120, the signal output part of pressure unit 118 is connected to the input end of first signal conditioning amplifier 124 through cable, the output terminal of first signal conditioning amplifier 124 is connected to an input channel of portable data acquisition module 126, the output channel of portable data acquisition module 126 is connected with computing machine 101 by USB interface, and computing machine 101 obtains the hydraulic pressure value in spray water container 120.
During work, the water in tank 109 arrives water pump 116 through flexible pipe 110, by pumping of water pump 116, is held and is delivered into proportional pressure valve 115; Through proportional pressure valve 115, regulate, the hydraulic pressure of output current meets system requirements, then enters spray water container 120; Current are ejected into the upper surface of detected materials 112 through the nozzle 113 of spray water container 120 afterwards, finally get back to tank 109.
Ultrasound emission and receiving trap comprise point focusing ultrasonic probe 119 and ultrasound emission/receiver 122; Ultrasonic signal harvester comprises an analog to digital converter 123, and point focusing ultrasonic probe 119 sealing is arranged in spray water container 120, axially the overlapping with nozzle 113 directions of point focusing ultrasonic probe 119; Spray water container 120 is arranged on by fixture on the card extender 121 of Z axis motion platform 104 load surfaces, and Z axis motion platform 104 drives nozzle container 120 and point focusing ultrasonic probe 119 to be synchronized with the movement while moving up and down; The terminals of point focusing ultrasonic probe 119 are connected with ultrasound emission/receiver 122; Signal after 122 conditionings of ultrasound emission/receiver inputs to analog to digital converter 123, and analog to digital converter 123 is through pci bus access computing machine 101, and computing machine 101 obtains the digital signal of ultrasonic echo.
Load measuring device comprises detected materials mounting platform 111, pedestal 107, load cell 108, secondary signal conditioning amplifier 125; Pedestal 107 is arranged on the base plate of tank 109, and load cell 108 is fixed on the upper surface of pedestal 107, and detected materials mounting platform 111 is placed on the test surfaces of load cell 108, and 112 of detected materials are fixed on detected materials mounting platform 111; The terminals of load cell 108 are connected with secondary signal conditioning amplifier 125 through cable, the load signal amplifying through 125 conditionings of secondary signal conditioning amplifier enters another input channel of portable data acquisition module 126, and computing machine 101 obtains load digital signal.
Described motion controller 102 is uniaxiality controller, has AB to coding reading capability, and integrated driver module; Working pressure 0.1～the 1.2MPa of proportional pressure valve 115; The range of load cell 108 is 0～110N, and its working temperature is-9 ℃～60 ℃, and its linear error is in ± 3%; The range of pressure unit 118 is 0.1～1.5MPa, and output signal is current signal 4～20mA; The centre frequency of point focusing ultrasonic probe 119 is one of 5MHz, 10MHz, 15MHz, 20MHz, and focal length is greater than 10mm and is less than 20mm; The fire pulse width of ultrasound emission/receiver 122 is that 10ns～20ms is adjustable, and reception amplifier frequency span is greater than 200MHz; Analog to digital converter 123 can gather the signal that peak-to-peak value is 2V, and the highest sample frequency is greater than 500MHz; Portable data acquisition module 126 has two input signal channels, and range of signal is 0～5V; The signal bandwidth of first signal conditioning amplifier 124 is greater than 10KHz, enlargement factor be 10～2000 times adjustable; The signal bandwidth of secondary signal conditioning amplifier 125 is greater than 5KHz, enlargement factor be 5～1000 times adjustable; The input signal of controller of electric liquid ratio valve 127 is 4～20mA, and output current is 0～2.5A, and precision classification is greater than 128.
As shown in Figure 2, point focusing ultrasonic probe 119 needs to meet following requirement with spray water container 120:
The focal length of focused ultrasonic transducer 119 of setting up an office is f, and ultrasound wave shakes face angle of release 202 for α, and the sound lens output face top that f is point focusing ultrasonic probe 119 is 201 distance to focal plane.Distance between the sound lens output face top of the desirable aperture position of nozzle 113 and point focusing ultrasonic probe 119 is f/2.The openings of sizes w of nozzle 113 is restricted to: w > f * tan α, and w > 2f * sin α.
Claims (4)
1. ultrasonic water is developed and printed and is pressed a device of measuring material viscoelasticity, it is characterized in that comprising Z axis motion and control device, current pumping and hydraulic control device, ultrasound emission and receiving trap, ultrasonic signal harvester, load measuring device, computing machine;
Z axis motion and control device comprise motion controller, grating ruler reading head, Z axis motion platform, grating scale; The motionless side of Z axis motion platform is provided with grating scale, and grating ruler reading head is arranged on platform motion side, and the signal cable of grating ruler reading head is connected on motion controller; Motion controller is connected with computing machine by USB cable; Data processing software is installed in computing machine, and the counting that the data processing software in computing machine obtains grating ruler reading head by DLL (dynamic link library) is encoded; Z axis motion platform load surface is provided with card extender, and card extender is used for installing spray water container; Described Z axis motion platform is arranged on movement platform base;
Current pumping and hydraulic control device comprise tank, water pump, proportional pressure valve, spray water container, controller of electric liquid ratio valve, pressure unit, first signal conditioning amplifier and portable data acquisition module; The input end of water pump is connected with the sidewall opening of tank by flexible pipe, and the end that pumps of water pump is connected to the input end of proportional pressure valve by flexible pipe; The output terminal of proportional pressure valve is connected to the entrance of spray water container by flexible pipe, the control end of proportional pressure valve is connected to controller of electric liquid ratio valve by cable; The sensor interface of pressure unit is arranged on spray water container, the signal output part of pressure unit is connected to the input end of first signal conditioning amplifier through cable, the output terminal of first signal conditioning amplifier is connected to an input channel of portable data acquisition module, the output channel of portable data acquisition module is connected with computing machine by USB interface, and computing machine obtains the hydraulic pressure value in spray water container;
Ultrasound emission and receiving trap comprise point focusing ultrasonic probe and ultrasound emission/receiver; Ultrasonic signal harvester comprises an analog to digital converter; The sealing of point focusing ultrasonic probe is arranged in spray water container, and the axial of point focusing ultrasonic probe overlaps with nozzle direction; Spray water container is arranged on by fixture on the card extender of Z axis motion platform load surface, and Z axis motion platform drives nozzle container and point focusing ultrasonic probe to be synchronized with the movement while moving up and down; The terminals of point focusing ultrasonic probe are connected with ultrasound emission/receiver; Signal after the conditioning of ultrasound emission/receiver inputs to analog to digital converter, and analog to digital converter accesses computing machine through pci bus, and computing machine obtains the digital signal of ultrasonic echo;
Load measuring device comprises detected materials mounting platform, pedestal, load cell, secondary signal conditioning amplifier; Pedestal is arranged on the base plate of tank, and load cell is fixed on the upper surface of pedestal, and detected materials mounting platform is placed on the test surfaces of load cell, and detected materials is fixed on detected materials mounting platform; The terminals of load cell are connected with secondary signal conditioning amplifier through cable, and the load signal amplifying through the conditioning of secondary signal conditioning amplifier enters another input channel of portable data acquisition module, and computing machine obtains load digital signal.
2. a kind of ultrasonic water as claimed in claim 1 is developed and printed and is pressed the device of measuring material viscoelasticity, it is characterized in that described Z axis motion platform adopts linear electric motors motion platform or stepper motor to add Motion Platform of Ballscrews.
3. a kind of ultrasonic water as claimed in claim 2 is developed and printed and is pressed the device of measuring material viscoelasticity, it is characterized in that described point focusing ultrasonic probe and spray water container need meet following requirement:
The focal length of focused ultrasonic transducer of setting up an office is f, and the ultrasound wave face angle of release that shakes is α, and f is the sound lens output face top of point focusing ultrasonic probe to the distance of focal plane; Distance between the sound lens output face top of nozzle opening position and point focusing ultrasonic probe is f/2; The openings of sizes w of nozzle is restricted to: w > f * tan α, and w > 2f * sin α.
4. a kind of ultrasonic water as claimed in claim 3 is developed and printed and is pressed the device of measuring material viscoelasticity, it is characterized in that described motion controller is uniaxiality controller, has AB to coding reading capability, and integrated driver module; Working pressure 0.1～the 1.2MPa of proportional pressure valve; The range of load cell is 0～110N, and its working temperature is-9 ℃～60 ℃, and its linear error is in ± 3%; The range of pressure unit is 0.1～1.5MPa, and output signal is current signal 4～20mA; The centre frequency of point focusing ultrasonic probe is 5MHz, 10MHz, 15MHz or 20MHz, and focal length is greater than 10mm and is less than 20mm; The fire pulse width of ultrasound emission/receiver is that 10ns～20ms is adjustable, and reception amplifier frequency span is greater than 200MHz; Analog to digital converter gathers the signal that peak-to-peak value is 2V, and the highest sample frequency is greater than 500MHz; Portable data acquisition module has two input signal channels, and range of signal is 0～5V; The signal bandwidth of first signal conditioning amplifier is greater than 10KHz, enlargement factor be 10～2000 times adjustable; The signal bandwidth of secondary signal conditioning amplifier is greater than 5KHz, enlargement factor be 5～1000 times adjustable; The input signal of controller of electric liquid ratio valve is 4～20mA, and output current is 0～2.5A, and precision classification is greater than 128.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884774A (en) * | 2014-02-27 | 2014-06-25 | 浙江大学 | Device and method for measuring viscoelasticity of material by using ultrasound water printing pressure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884774A (en) * | 2014-02-27 | 2014-06-25 | 浙江大学 | Device and method for measuring viscoelasticity of material by using ultrasound water printing pressure |
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