CN103308011B - A kind of ultrasonic film thickness measuring instrument and measuring method thereof - Google Patents
A kind of ultrasonic film thickness measuring instrument and measuring method thereof Download PDFInfo
- Publication number
- CN103308011B CN103308011B CN201310198294.9A CN201310198294A CN103308011B CN 103308011 B CN103308011 B CN 103308011B CN 201310198294 A CN201310198294 A CN 201310198294A CN 103308011 B CN103308011 B CN 103308011B
- Authority
- CN
- China
- Prior art keywords
- circuit
- ultrasonic
- oil film
- film thickness
- pulse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000005284 excitation Effects 0.000 claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 238000004891 communication Methods 0.000 claims abstract description 4
- 238000013480 data collection Methods 0.000 claims abstract description 3
- 238000011084 recovery Methods 0.000 claims description 32
- 230000005669 field effect Effects 0.000 claims description 26
- 238000013016 damping Methods 0.000 claims description 15
- 238000002604 ultrasonography Methods 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000010183 spectrum analysis Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 3
- 230000008034 disappearance Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 69
- 230000005611 electricity Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 241000132179 Eurotium medium Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010291 electrical method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Landscapes
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
The invention provides a kind of ultrasonic meter for monitoring oil film thickness between two contact surfaces and measuring method thereof.Ultrasonic meter includes impulse ejection circuit, ultrasonic excitation circuit, ultrasonic reception circuit, data acquisition telecommunication circuit and the PC being sequentially connected with, wherein ultrasonic excitation circuit is also associated with ultrasonic transducer, impulse ejection circuit and data collection communication circuit and shares a piece of single-chip microcomputer.Comparing traditional audigage, digital integrated electronic circuit makes audigage volume less, and A/D sampling rate is the highest, ultrasonic signal directly carries out radio frequency sampling, does not results in the disappearance of information.Circuit design is fairly simple, can process corresponding data.Designed instrument, uses new Calculation of Oil Film Thickness method, it is possible to the oil film thickness of measurement reaches nanoscale, is more suitable for the measurement of oil film thickness.
Description
Technical field
The present invention relates to ultrasonic measurement oil film thickness field, specifically one utilizes ultrasonic measurement to moisten
The instrument of lubricating oil film thickness.
Background technology
In commercial production, in order to reduce the friction occurred when the surface of the work contacted with each other performs relative motion
And abrasion, between surface, often add lubricant.Wherein, a kind of profit conventional during hydrodynamic lubrication is industry
Sliding mode.The factors such as the character and the cost that consider lubricant, bearing, gear, piston and other
The plant equipment major parts such as sealing device are all to select mineral oil as lubricant.Lubricate at Study of Liquid
Time, mainly analyze the pressure distribution feelings in oil film thickness, oil film shape and the oil film between friction pair
The problems such as condition, it is judged that the Main Basis of plant equipment lubricating status is Film Thickness Ratio, it is that minimum oil film is thick
Degree and the ratio of surface roughness.Under normal circumstances in order to enable the reliable and stable operating of plant equipment,
Film Thickness Ratio should be greater than 3.
Along with the development of industrial technology, plant equipment generally develops to high speed, heavy duty, high temperature direction.
Linear velocity between higher surface ratio pressure, big load impacting and surface, the most easily makes in parts
It is the thinnest that lubricating oil oil film becomes, easily damaged.When oily lepthymenia time, rubbing surface subregion is easily in
Dry condition, surface temperature raises along with the aggravation of abrasion, will cause equipment not under serious conditions
Can normally work.But when oil film is blocked up, is easily caused again plant equipment bearing capacity and declines, work
Make instability, the phenomenons such as leakage of oil occur.Therefore oil film thickness is the key factor affecting hydrodynamic lubrication,
Need it is carried out on-line monitoring, understand the lubricating status of equipment at any time.
Current oil film thickness measuring method mainly has the methods such as electricity, optics and acoustics.Electricity, light
Method all also exists certain deficiency, the plane of electrical method one electric insulation of need or a complete electricity
The osculating element of isolation installs sensor；Optical means major defect needs to connect with oil film when being to measure
The entity touched is transparent or physically leaves the window of transmission light beam, this and the reality of machine components
Operating mode has bigger difference.
Commonly use in acoustics is ultrasonic detecting technology, and it is to utilize ultrasound wave to carry out various detection and survey
The technology of amount.The development of ultrasonic detection instrument is divided into simulation ultrasound measuring instrument and digital ultrasound detection
Instrument two benches.
Traditional analog ultrasound detection instrument produces early, it be utilize Analog Electronics Technique to process signal,
The structure of system is complicated, operation requires height, certainty of measurement is low, optional function is few, reliability is low, body
Long-pending big.Current digital ultrasound detector Technical comparing is ripe, but still comes with some shortcomings.Instrument
A/D sampling rate the most on the low side, most digital instrument still uses detection techniques, not straight to signal
Connect radio frequency sampling, easily cause the disappearance of ultrasonic signal information.
It addition, current ultrasonic film thickness measuring instrument majority is pulse reflection method measuring instrument, sent out by launching oscillator
Penetrate ultrasound wave, make ultrasound wave inject interior of articles by couplant, pick-up dipole receive object bottom surface
The ultrasound wave reflected, carrys out the time of travel back according to ultrasound wave and the velocity of sound in object calculates thing
Body thickness.The measurable thickness range of this theoretical method is limited, and maximal accuracy is up to 1 μm, for little
Oil film thickness in 1 μm cannot be measured side accurately.
Summary of the invention
The invention provides a kind of for monitoring the ultrasonic meter of oil film thickness between two contact surfaces, adopt
Sample efficiency is high, it is possible to measure micron-sized thin oil film thickness.
Impulse ejection circuit that the present invention includes being sequentially connected with, ultrasonic excitation circuit, ultrasonic reception circuit,
Data acquisition telecommunication circuit and PC, wherein ultrasonic excitation circuit is also associated with ultrasonic transducer, pulse
Radiating circuit and data collection communication circuit share a piece of single-chip microcomputer.
Improving further, described impulse ejection circuit includes that the pulse being connected in turn on single-chip microcomputer is sent out
Core shooting sheet, pulse number control circuit, electric capacity C5, gain operational amplifier, on impulse ejection chip
It is also associated with frequency selective switch, the time of Single-chip Controlling low and high level, thus controls radiating circuit
The pulse number launched, impulse ejection chip can be launched the train of pulse of 0.1Hz～20MHz, can pass through
Frequency selective switch manually selects the pulse of different frequency, and the pulse of generation is through gain operational amplifier
Amplify, output to ultrasonic excitation circuit.
Improve further, described ultrasonic excitation circuit include field effect transistor driving chip, field effect transistor,
Three fast recovery diodes, electric capacity C6, charging resistor R1, damping resistance R2 and high voltage power supply,
Field effect transistor driving chip accesses 9V voltage, and IN-A foot connects input pulse signal, OA foot output signal
Connecting the G pole of field effect transistor, the D pole of field effect transistor connects one end of electric capacity C6, S pole ground connection, electricity
The other end and the fast recovery diode D2 that hold C6 connect, fast recovery diode D3 and fast quick-recovery
Diode D2 connects, and the other end of damping resistance R2 one end and fast recovery diode D3 connects, separately
One end ground connection, fast recovery diode D1 one end and electric capacity C6 and the connection of fast recovery diode D2
Point connects, other end ground connection, and high voltage power supply is connected by charging resistor R1 and electric capacity C6, ultrasonic changes
Energy device is in parallel with damping resistance R2, and the train of pulse of input is boosted by field effect transistor driving chip, control
The closedown of field effect transistor processed and opening, electric capacity C6 carries out discharge and recharge, produces high voltage negative pulse when electric discharge,
Excitation ultrasound transducer.
Improving further, described ultrasonic reception circuit includes the amplitude limiter circuit being sequentially connected in series, amplifies electricity
Road and bandwidth-limited circuit.
Improving further, described amplitude limiter circuit includes 4 diodes, wherein diode D4 and two poles
Pipe D6 is Zener diode, and voltage stabilizing value is 3V, and one end is accessed between amplifying circuit and ultrasonic excitation circuit,
The other end is connected to diode D5 and diode D7 respectively, another termination of diode D5 and diode D7
Ground, peak-inverse voltage is 1000V,.
Improving further, data acquisition telecommunication circuit includes A/D change-over circuit, the data being sequentially connected in series
Buffer circuit, single-chip microcomputer and telecommunication circuit.
Present invention also offers the measuring method of a kind of described ultrasonic film thickness measuring instrument, measuring process is:
1) train of pulse that impulse ejection circuit transmission frequency is 2.5MHz is utilized；
2) utilize train of pulse above to produce high voltage negative pulse in ultrasonic excitation circuit, encourage ultrasonic changing
Can device；
3) utilizing ultrasonic reception circuit that reflected signal is carried out amplitude limit, amplification, bandpass filtering, extraction has
Use signal；
4) conversion of the A/D in data acquisition telecommunication circuit is utilized to be converted to by the signal that reception above processes
Digital signal, row cache of going forward side by side, then sent to by telecommunication circuit by the data of single-chip microcomputer reading storage
PC；
5) data utilizing single-chip microcomputer to upload carry out spectrum analysis to reflected signal, obtain reflection coefficient
Spectrogram；
6) whether the reflection coefficient in the range of determination frequency has minimum, if having, then enters step (7),
Otherwise enter step (8)；
7) according to following formula calculating oil film thickness:
Wherein h is oil film thickness, c2For the velocity of sound in oil film, m is oil film resonance exponent number, fmFor m rank
Resonant frequency；
8) according to following formula calculating oil film thickness:
Wherein h is oil film thickness, ρ2For oil film density, c2For the velocity of sound in oil film, ω is that oil film is humorous
Shake angular frequency, z1、z3Being respectively the acoustic impedance of oil film media of both sides, R is reflection coefficient, is echo
Amplitude and the ratio of incident wave amplitude.
The invention have the benefit that
1, comparing traditional audigage, digital integrated electronic circuit makes audigage volume less, A/D
Sampling rate is the highest, ultrasonic signal directly carries out radio frequency sampling, does not results in the disappearance of information.
2, circuit design is fairly simple, can process corresponding data.
3, the oil film thickness that designed instrument can be measured reaches nanoscale, is more suitable for lubricating oil film thickness
The measurement of degree.
Accompanying drawing explanation
Fig. 1 is oil film schematic diagram between two layer medium in the present invention；
Fig. 2 is the structural representation of ultrasonic film thickness measuring instrument in the present invention；
Fig. 3 is the circuit diagram of ultrasonic film thickness measuring instrument in the present invention；
Fig. 4 is the pulse schematic diagram of impulse ejection circuit transmission in the present invention；
Fig. 5 is ultrasonic excitation circuit diagram in the present invention；
Fig. 6 is the high-voltage pulse schematic diagram of field effect pipe driving chip output in the present invention；
Fig. 7 is amplitude limiter circuit figure in the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings the technical scheme of invention is further described:
Oil film thickness in different plant equipment is different, in order to distinguish, thin defined in the present invention
Oil film and the concept of heavy oil film, be typically referred to as thin oil film when oil film thickness is much smaller than incidence wave wavelength,
Otherwise then it is referred to as heavy oil film.Two kinds of computation models are established, for heat-bodied oil for different oil film thicknesses
Film uses resonance model, otherwise then uses spring model.This is the theoretical mould finally calculating oil film thickness
Type.
As it is shown in figure 1, oil film to be measured (i.e. medium II), between medium I, III, gives in figure
Ultrasound wave propagation condition in three layers of medium.
When oil film is heavy oil film, set up resonance model.Ultrasound wave impinges perpendicularly on the separating surface of oil film
On, by ACOUSTIC WAVE EQUATION, the displacement of sound wave and stress formula in available medium:
A in formula0、A1Representing incident acoustic wave and the amplitude of reflection sound wave respectively, ω is angular frequency, c sound
Speed.
Owing to reflection coefficient is the ratio of echo amplitude and incident wave amplitude, unrelated with the time, in order to
Convenient calculating, removes the e in formulaiωt, therefore displacement and the stress of medium I is represented by:
T in formula1And R1It is incidence wave and the amplitude of echo, z in medium I1Characteristic impedance for medium I.
In like manner can provide medium II and III displacement and stress formula:
According to displacement at separating surface and stress continuous print Acoustic Boundary Conditions, can draw:
Assume the amplitude T of incidence wave1It is 1, draws the amplitude R of echo1I.e. ultrasonic reflection coefficient is expressed
Formula is:
Wherein,When propagating the integral multiple of wavelength half during oil film thickness is oil film, can
Obtain the angular frequency of oil film resonanceresFor:
ωres=π c2m/h
In formula, m represents the resonance exponent number of oil film, and m is positive integer.
When the frequency of incident acoustic wave is equal to the resonant frequency of oil film, the expression formula of g is:
The g when m is integer2=1, can obtain reflection coefficient:
So when oil film media of both sides is identical, reflection coefficient is equal to 0.In such a case, it is possible to it is sharp
Calculating oil film thickness by the resonant frequency of reflection coefficient, this model is referred to as resonance model.Now oil film
The expression formula of thickness is:
F in formulamFor m rank resonant frequency.
When oil film is thin oil film, oil film quality can be ignored, and only considers that oil film is elastic to reflection coefficient
Impact, now oil film can be equivalent to light spring, and this model can be described as spring model.
Being obtained spring deflection by the displacement of sound wave in aforementioned medium is Δ u=u3(0,t)-u1(0, t), according to recklessly
Gram law calculates stress expression formula in oil film and is:
σ=KNΔu
K in formulaNFor oil film rigidity.
According to the characteristic of light spring, stress σ at the separating surface of oil film both sides1、σ3With stress σ in oil film
Equal, i.e. σ1(0, t)=σ3(0, t)=σ.
Echo amplitude R can be drawn according to above-mentioned condition1The i.e. expression formula of ultrasonic reflection coefficients R is:
Oil film can be as perfect fluid under normal circumstances, oil film rigidity KNPressure on representation unit area
Relation between variable quantity and oil film thickness h variable quantity, when oil film is the thinnest, KNAcoustic formula be:
Through arranging the expression formula drawing ultrasonic reflection coefficient it is:
Oil film thickness is:
As it is shown on figure 3, design ultrasonic film thickness measuring instrument include impulse ejection circuit, ultrasonic excitation circuit,
Single crystal probe ultrasonic transducer, ultrasonic reception circuit, data acquisition telecommunication circuit.
First impulse ejection main circuit single-chip microcomputer to be included, impulse ejection chip MAX038, frequency selects
Switch, pulse number control circuit CD4066, electric capacity C5, gain operational amplifier AD603.
MAX038 can produce the pulse signal of 0.1Hz～20MHz, and its A0, A1 pin is by single-chip microcomputer
P2.2 and P2.3 controls to make it produce rectangular pulse signal.The output center frequency of MAX038 in the present invention
For:
f0=Iin/ cosc,
Here IinFor input current, cosc is the capacitance accessed.As seen from Figure 3, cosc accesses
Electric capacity selected by hand switch.Select cosc connects the electric capacity of 100pF, make MAX038 defeated
Go out the pulse that mid frequency is 2.5MHz.
The pin that controls of CD4066 is connected with the P1.3 of single-chip microcomputer, by the Single-chip Controlling square by switch
The number of shape pulse.When P1.3 is output as high impulse, switch Guan Bi, the rectangle arteries and veins that MAX038 sends
Rush by CD4066, otherwise, switch is opened, and pulse can not be output as low-voltage by switch.Logical
The pulse number crossed can be calculated by following formula:
N=t/T
Wherein, t is the time of one cycle generation high impulse of single-chip microcomputer, and T is the pulse that MAX038 produces
In the cycle of signal, in the present invention, t is about 1.5 μ s, it is allowed to by about 4 pulses, as shown in Figure 4.
The outfan of CD4066 connects the input of variable gain amplifier AD603.The gain of AD603 can
To calculate with following formula:
Gain (dB)=40VG+G0
Wherein VGIt is the gain-controlled voltage (1 foot and the voltage difference of 2 feet) of differential input, unit in formula
Use V；G0It is gain starting point, different feedback network G0Value difference, 5 feet and output pin 7 in the present invention
It is joined directly together, G0It is 10dB.In invention use AD603, carry a width of 90MHz, gain be-10～
+30dB.Pulse to input is amplified so that it is can exceed that the minimum input of field effect transistor driving chip
High voltage.
Ultrasonic excitation circuit below, as it is shown in figure 5, include field effect transistor driving chip
ISL55110IVZ, field effect transistor IRF840, three fast recovery diode FR107, electric capacity C6, fill
Electricity resistance R1, damping resistance R2 and high voltage power supply.Effect pipe driving chip ISL55110IVZ has two to lead to
Road, that utilize in the present invention is passage A, and the signal after amplifying is input to IN-A foot, accesses 9V's
Voltage, the output of OA foot is identical with input pulse but amplitude is the pulse of 9V, output signal such as Fig. 6.OA
Foot output signal connects the g pole of field effect transistor IRF840, and the d pole of field effect transistor IRF840 connects electric capacity C1
One end, s pole ground connection, the other end of electric capacity C6 and fast recovery diode D2 connect, fast quick-recovery two
Pole pipe D3 and fast recovery diode D2 series connection, damping resistance R2 one end and fast recovery diode D3's
The other end connects, other end ground connection, fast recovery diode D1 one end and electric capacity C6 and fast quick-recovery two
The junction point two of pole pipe D2 connects, other end ground connection, and high voltage power supply is connected by charging resistor R1 and electric capacity C6
Connect.
In circuit, R1 is charging resistor, and R2 is damping resistance, and C1 is charge and discharge capacitance.When not sending out
Penetrating pulse when i.e. inputting as low level, field effect transistor IRF840 is ended, and high voltage power supply passes through charging resistor
R1, fast recovery diode D1 charge to charge and discharge capacitance C1；When launching pulse and arriving, field is imitated
Should turn on by pipe IRF840, turn on moment, drain voltage has dragged down charge and discharge capacitance C1, due to electric capacity electricity
Pressure can not change at once, and charge and discharge capacitance C1 and the recovery diode D2 end that is connected becomes-300V, passes through
IRF840 damping resistance, damping resistance R2, recovery diode D3, recovery diode D2 discharge,
A negative high voltage pulse is produced, it is simply that utilize this negative pulse to carry out excitation ultrasound at damping resistance R2 two ends
Transducer, launches ultrasound wave.
Ultrasonic reception circuit includes amplitude limiter circuit, amplifying circuit and band filter.Amplitude limiter circuit such as Fig. 7
Shown in, the echo that ultrasonic transducer receives is input to amplitude limiter circuit.For single probe during amplitude limiter circuit
Transducer, limits the signal amplitude receiving passage, prevents from damaging the element on circuit.Diode D4,
Diode D6 is Zener diode 1N4727, and voltage stabilizing value is 3V；Diode D5, diode D7 are two
Pole pipe 1N4007, its peak-inverse voltage Ei 1000V, during conducting, pressure drop is 0.7V.Work as input voltage
During higher than 3.7V, diode D4 punctures, through diode D5 ground connection；During less than-3.7V, diode
D6 punctures, through diode D7 ground connection.This just makes voltage stabilization between-3.7V～3.7V.The logical filter of band
Wave circuit is the passive filter utilizing inductance, electric capacity to form.
Data acquisition telecommunication circuit includes A/D change-over circuit, data caching circuit, single-chip microcomputer, communication
Circuit MAX232.It is received the signal after processing of circuit and is input to analog to digital conversion circuit, due to use
It is A/D sampling A/D chip at a high speed, first the digital signal after conversion is stored in latch, then by single-chip microcomputer
Read and communicate with PC through MAX232, data are uploaded to PC.
Finally utilize the PC host computer data to sending to carry out spectrum analysis, analyze different frequency
Reflection coefficient, utilizes the theoretical model set up to calculate oil film thickness.
In conjunction with Fig. 2, the measuring process of the present invention is as follows:
1) train of pulse that impulse ejection circuit transmission frequency is 2.5MHz is utilized；；
2) utilize train of pulse above to produce high voltage negative pulse in ultrasonic excitation circuit, encourage ultrasonic changing
Can device；
3) utilizing ultrasonic reception circuit that reflected signal is carried out amplitude limit, amplification, bandpass filtering, extraction has
Use signal；
4) conversion of the A/D in data acquisition telecommunication circuit is utilized to be converted to by the signal that reception above processes
Digital signal, row cache of going forward side by side, then sent to by telecommunication circuit by the data of single-chip microcomputer reading storage
PC；
5) data utilizing single-chip microcomputer to upload carry out spectrum analysis to reflected signal, obtain reflection coefficient
Spectrogram；
6) whether the reflection coefficient in the range of determination frequency has minimum, if having, then enters step (7),
Otherwise enter step (8)；
7) according to following formula calculating oil film thickness:
Wherein h is oil film thickness, c2For the velocity of sound in oil film, m is oil film resonance exponent number, fmFor m rank
Resonant frequency；
8) according to following formula calculating oil film thickness:
Wherein h is oil film thickness, ρ2For oil film density, c2For the velocity of sound in oil film, ω is that oil film is humorous
Shake angular frequency, z1、z3Being respectively the acoustic impedance of oil film media of both sides, R is reflection coefficient, is echo
Amplitude and the ratio of incident wave amplitude.
The concrete application approach of the present invention is a lot, and the above is only the preferred embodiment of the present invention, it should refer to
Go out, for those skilled in the art, under the premise without departing from the principles of the invention,
Can also make some improvement, these improvement also should be regarded as protection scope of the present invention.
Claims (6)
1. a ultrasonic film thickness measuring instrument, it is characterised in that: the impulse ejection circuit that includes being sequentially connected with,
Ultrasonic excitation circuit, ultrasonic reception circuit, data acquisition telecommunication circuit and PC, wherein ultrasonic excitation
Circuit is also associated with ultrasonic transducer, impulse ejection circuit and data collection communication circuit and shares a piece of list
Sheet machine；Described ultrasonic excitation circuit include field effect transistor driving chip, field effect transistor, three quickly
Recovery diode, electric capacity C6, charging resistor R1, damping resistance R2 and high-voltage DC power supply, field is imitated
Answering pipe driving chip to access 9V voltage, IN-A foot connects input pulse signal, and OA foot output signal connects
The G pole of field effect transistor, the D pole of field effect transistor connects one end of electric capacity C6, S pole ground connection, electric capacity C6
The other end and fast recovery diode D2 connect, fast recovery diode D3 and fast quick-recovery two pole
Pipe D2 connects, and the other end of damping resistance R2 one end and fast recovery diode D3 connects, the other end
Ground connection, fast recovery diode D1 one end connects with the junction point of electric capacity C6 and fast recovery diode D2
Connecing, other end ground connection, high voltage power supply is connected by charging resistor R1 and electric capacity C6, ultrasonic transducer
In parallel with damping resistance R2, the train of pulse of input is boosted by field effect transistor driving chip, controlling filed
The closedown of effect pipe and opening, electric capacity C6 carries out discharge and recharge, produces high voltage negative pulse when electric discharge, swashs
Send out ultrasonic transducer.
Ultrasonic film thickness measuring instrument the most according to claim 1, it is characterised in that: described pulse
Impulse ejection chip that radiating circuit includes being connected in turn on single-chip microcomputer, pulse number control circuit,
Electric capacity C5, gain operational amplifier, impulse ejection chip is also associated with frequency selective switch, monolithic
The time of machine control low and high level, thus control the pulse number that radiating circuit is launched, impulse ejection chip
The train of pulse of 0.1Hz～20MHz can be launched, different frequency can be manually selected by frequency selective switch
Pulse, the pulse of generation amplifies through gain operational amplifier, and output is to ultrasonic excitation circuit.
Ultrasonic film thickness measuring instrument the most according to claim 1, it is characterised in that: described is ultrasonic
Receive amplitude limiter circuit, amplifying circuit and bandwidth-limited circuit that circuit includes being sequentially connected in series.
Ultrasonic film thickness measuring instrument the most according to claim 3, it is characterised in that: described amplitude limit
Circuit includes 4 diodes, and wherein diode D4 and diode D6 is Zener diode, voltage stabilizing value
For 3V, between one end access amplifying circuit and ultrasonic excitation circuit, the other end is connected to diode D5 respectively
With diode D7, the other end ground connection of diode D5 and diode D7, peak-inverse voltage is 1000V.
Ultrasonic film thickness measuring instrument the most according to claim 1, it is characterised in that: data acquisition is led to
Letter circuit includes A/D change-over circuit, data caching circuit, single-chip microcomputer and the telecommunication circuit being sequentially connected in series.
6. a measuring method for ultrasonic film thickness measuring instrument, uses following measurement apparatus, including connecting successively
The impulse ejection circuit that connects, ultrasonic excitation circuit, ultrasonic reception circuit, data acquisition telecommunication circuit and
PC, wherein ultrasonic excitation circuit is also associated with ultrasonic transducer, impulse ejection circuit and data acquisition
Telecommunication circuit shares a piece of single-chip microcomputer；Described ultrasonic excitation circuit include field effect transistor driving chip,
Field effect transistor, three fast recovery diodes, electric capacity C6, charging resistor R1, damping resistance R2 and
High-voltage DC power supply, field effect transistor driving chip accesses 9V voltage, and IN-A foot connects input pulse signal,
OA foot output signal connects the G pole of field effect transistor, and the D pole of field effect transistor connects one end of electric capacity C6,
S pole ground connection, the other end of electric capacity C6 and fast recovery diode D2 connect, fast recovery diode
D3 and fast recovery diode D2 series connection, damping resistance R2 one end and fast recovery diode D3's is another
One end connects, other end ground connection, fast recovery diode D1 one end and electric capacity C6 and fast quick-recovery two
The junction point of pole pipe D2 connects, other end ground connection, and high voltage power supply passes through charging resistor R1 and electric capacity C6
Connecting, single crystal transducer is in parallel with damping resistance R2, and field effect transistor driving chip is by the train of pulse of input
Boosting, control the closedown of field effect transistor and open, electric capacity C6 carries out discharge and recharge, produces when electric discharge
Raw high voltage negative pulse, excitation ultrasound transducer；Wherein ultrasonic reception circuit includes the amplitude limit being sequentially connected in series
Circuit, amplifying circuit and bandwidth-limited circuit, data acquisition telecommunication circuit includes the A/D being sequentially connected in series
Change-over circuit, data caching circuit, single-chip microcomputer and telecommunication circuit, it is characterised in that measuring process is:
1) train of pulse that impulse ejection circuit transmission frequency is 2.5MHz is utilized；
2) utilize train of pulse above to produce high voltage negative pulse in ultrasonic excitation circuit, encourage ultrasonic changing
Can device；
3) utilizing ultrasonic reception circuit that reflected signal is carried out amplitude limit, amplification, bandpass filtering, extraction has
Use signal；
4) conversion of the A/D in data acquisition telecommunication circuit is utilized to be converted to by the signal that reception above processes
Digital signal, row cache of going forward side by side, then sent to by telecommunication circuit by the data of single-chip microcomputer reading storage
PC；
5) data utilizing single-chip microcomputer to upload carry out spectrum analysis to reflected signal, obtain reflection coefficient
Spectrogram；
6) whether the reflection coefficient in the range of determination frequency has minimum, if having, then enters step (7),
Otherwise enter step (8)；
7) according to following formula calculating oil film thickness:
Wherein h is oil film thickness, c2For the velocity of sound in oil film, m is oil film resonance exponent number, fmFor m rank
Resonant frequency；
8) according to following formula calculating oil film thickness:
Wherein h is oil film thickness, ρ2For oil film density, c2For the velocity of sound in oil film, ω is oil film resonant angle
Frequency, z1、z3Being respectively the acoustic impedance of oil film media of both sides, R is reflection coefficient, is echo amplitude
Ratio with incident wave amplitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310198294.9A CN103308011B (en) | 2013-05-24 | 2013-05-24 | A kind of ultrasonic film thickness measuring instrument and measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310198294.9A CN103308011B (en) | 2013-05-24 | 2013-05-24 | A kind of ultrasonic film thickness measuring instrument and measuring method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103308011A CN103308011A (en) | 2013-09-18 |
| CN103308011B true CN103308011B (en) | 2016-08-10 |
Family
ID=49133505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310198294.9A Expired - Fee Related CN103308011B (en) | 2013-05-24 | 2013-05-24 | A kind of ultrasonic film thickness measuring instrument and measuring method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103308011B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989703A (en) * | 2017-05-25 | 2017-07-28 | 湖南大学 | A kind of gamut lubrication film thickness supersonic detection device and method |
| CN107966120A (en) * | 2017-12-07 | 2018-04-27 | 青岛理工大学 | A kind of caliberating device and its assay method of ultrasonic measurement thickness |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101311A (en) * | 2014-06-23 | 2014-10-15 | 南京航空航天大学 | Ultrasonic sensor used for liquid layer thickness monitoring in mechanical structure |
| CN106441176B (en) * | 2016-10-12 | 2019-04-02 | 苏州博昇科技有限公司 | A kind of method of Air Coupling ultrasound examination film thickness |
| CN106732975B (en) * | 2016-12-30 | 2019-03-15 | 西安景辉信息科技有限公司 | One kind is with ball mill oil film bearings thickness monitor device and its monitoring method |
| CN107907079A (en) * | 2017-11-16 | 2018-04-13 | 哈尔滨工程大学 | A kind of ultrasound thin oil film calibration testboard |
| CN108469237A (en) * | 2018-03-05 | 2018-08-31 | 武汉理工大学 | A kind of bush(ing) bearing week lubrication film thickness dynamic measurement device and method |
| CN108317946B (en) * | 2018-03-29 | 2020-05-05 | 许昌学院 | Capacitance measuring device for thickness of lubricating oil film and testing method thereof |
| CN109059815B (en) * | 2018-07-09 | 2020-04-03 | 天津大学 | Method for measuring thickness of gas-liquid two-phase flow liquid film based on ultrasound |
| CN108982665A (en) * | 2018-07-24 | 2018-12-11 | 武汉大学 | A kind of reflectoscope and method |
| CN108955589B (en) * | 2018-09-25 | 2020-04-17 | 浙江省特种设备检验研究院 | In-situ measurement method and device for embedding depth of toughened glass |
| CN110579188B (en) * | 2019-09-30 | 2021-01-29 | 西安交通大学 | Self-adaptive extraction method of reference signal in ultrasonic lubricating film thickness measurement |
| CN113834454B (en) * | 2021-09-07 | 2024-01-26 | 青岛理工大学 | Method for realizing wide-range lubrication film thickness measurement by single ultrasonic probe and verification platform |
| CN114543716A (en) * | 2022-03-16 | 2022-05-27 | 哈尔滨工业大学 | Oil film thickness measuring method based on real part of ultrasonic reflection coefficient |
| CN114371223B (en) * | 2022-03-16 | 2022-09-20 | 浙江大学杭州国际科创中心 | Silicon carbide crystal growth detection device and method and silicon carbide crystal growth furnace |
| CN115307586B (en) * | 2022-08-17 | 2023-07-18 | 哈尔滨工业大学 | Method for measuring oil film thickness of bearing raceway interface Bao Xifu |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2481047Y (en) * | 2001-05-10 | 2002-03-06 | 张振欣 | Electronic interlinked controller |
| CN101718538A (en) * | 2009-12-14 | 2010-06-02 | 钢铁研究总院 | Signal receiving and amplifying device of electromagnetic ultrasonic thickness measuring instrument |
| CN201497529U (en) * | 2009-09-07 | 2010-06-02 | 南京信息工程大学 | Ultrasonic measurement data acquisition device |
| CN102183228A (en) * | 2011-01-05 | 2011-09-14 | 南京航空航天大学 | Ultrasonic measurement method of oil film thickness |
| CN202133386U (en) * | 2011-06-30 | 2012-02-01 | 邢金宝 | Ultrasonic thickness meter |
| CN202182706U (en) * | 2011-08-22 | 2012-04-04 | 南通友联数码技术开发有限公司 | Ultrasonic coating thickness gauge |
| CN102445169A (en) * | 2011-09-28 | 2012-05-09 | 南京信息工程大学 | Ultrasonic wave thickness measuring device based on radiofrequency wireless communication technology |
| CN102879611A (en) * | 2012-10-22 | 2013-01-16 | 瓮福（集团）有限责任公司 | Circuit for detecting breakage or short circuiting of speed sensor circuit |
| CN103234495A (en) * | 2013-04-16 | 2013-08-07 | 南京航空航天大学 | Ultrasonic measuring device for oil film thickness |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10244554B4 (en) * | 2002-09-25 | 2004-08-26 | Sms Meer Gmbh | Method and device for measuring the wall thickness of a pipe in a pipe rolling mill |
-
2013
- 2013-05-24 CN CN201310198294.9A patent/CN103308011B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2481047Y (en) * | 2001-05-10 | 2002-03-06 | 张振欣 | Electronic interlinked controller |
| CN201497529U (en) * | 2009-09-07 | 2010-06-02 | 南京信息工程大学 | Ultrasonic measurement data acquisition device |
| CN101718538A (en) * | 2009-12-14 | 2010-06-02 | 钢铁研究总院 | Signal receiving and amplifying device of electromagnetic ultrasonic thickness measuring instrument |
| CN102183228A (en) * | 2011-01-05 | 2011-09-14 | 南京航空航天大学 | Ultrasonic measurement method of oil film thickness |
| CN202133386U (en) * | 2011-06-30 | 2012-02-01 | 邢金宝 | Ultrasonic thickness meter |
| CN202182706U (en) * | 2011-08-22 | 2012-04-04 | 南通友联数码技术开发有限公司 | Ultrasonic coating thickness gauge |
| CN102445169A (en) * | 2011-09-28 | 2012-05-09 | 南京信息工程大学 | Ultrasonic wave thickness measuring device based on radiofrequency wireless communication technology |
| CN102879611A (en) * | 2012-10-22 | 2013-01-16 | 瓮福（集团）有限责任公司 | Circuit for detecting breakage or short circuiting of speed sensor circuit |
| CN103234495A (en) * | 2013-04-16 | 2013-08-07 | 南京航空航天大学 | Ultrasonic measuring device for oil film thickness |
Non-Patent Citations (3)
| Title |
|---|
| 《利用反射系数测量油膜厚度的研究》;唐伟坤等;《润滑与密封》;20101231;第35卷(第12期);第44-47页 * |
| 《机械结构流体层厚度超声测量方法理论研究》;焦敬品等;《声学技术》;20090630;第28卷(第3期);第240-244页 * |
| 《超声膜厚测量机理及传感器研究》;唐伟坤;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20111215;C030-28 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989703A (en) * | 2017-05-25 | 2017-07-28 | 湖南大学 | A kind of gamut lubrication film thickness supersonic detection device and method |
| CN106989703B (en) * | 2017-05-25 | 2019-05-17 | 湖南大学 | A kind of gamut lubrication film thickness supersonic detection device and method |
| CN107966120A (en) * | 2017-12-07 | 2018-04-27 | 青岛理工大学 | A kind of caliberating device and its assay method of ultrasonic measurement thickness |
| CN107966120B (en) * | 2017-12-07 | 2020-04-28 | 青岛理工大学 | Calibration device for measuring film thickness by ultrasonic waves and measuring method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103308011A (en) | 2013-09-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103308011B (en) | A kind of ultrasonic film thickness measuring instrument and measuring method thereof | |
| CN103528782B (en) | Based on thin-walled workpiece vibration-testing apparatus and the method for piezoelectric actuator | |
| Wang et al. | Experimental research on in-pipe leaks detection of acoustic signature in gas pipelines based on the artificial neural network | |
| CN106989703A (en) | A kind of gamut lubrication film thickness supersonic detection device and method | |
| CN110274956A (en) | A kind of pipe ultrasonic guided wave detecting method based on Kolmogorov entropy | |
| CN1743839A (en) | Structure defect ultrasonic on-line intelligent identifying system and identifying method | |
| CN103591975B (en) | A kind of ultrasonic sensor index detection method and device | |
| CN102338776A (en) | Method for measuring propagation time of stress wave in wood and nondestructive test system | |
| CN208872879U (en) | A kind of microseism data collection system | |
| CN107436451A (en) | A kind of automatic amplitude spectral method for calculating geological data optical cable coupled noise degree of strength | |
| CN103604728B (en) | Based on the sand grain droplet measurement device and method of stream solid Interface Wave | |
| CN104792655B (en) | A kind of density sensing system | |
| CN103278562A (en) | Two-dimensional scanning system for measuring sound fields | |
| CN205714170U (en) | Oil well intelligent producing fluid level monitoring device | |
| CN2809640Y (en) | Ultrasonic online intelligent recognition system for structural defect | |
| CN102670252B (en) | Intracranial pressure non-invasive measuring method and system | |
| Wang et al. | Research on comprehensive and effective acoustic signal processing methods for caculating downhole liquid level depth | |
| CN202974215U (en) | Sucker rod length measuring instrument | |
| CN205679213U (en) | A kind of wave run-up measurement apparatus | |
| CN208155598U (en) | A kind of vehicle body mating formation couples fissipation factor test macro | |
| CN206818638U (en) | Cable defect detecting system based on electromagnetic transmission lineation opinion | |
| CN110459197A (en) | Signal Booster and method for faint blind signal denoising and extraction | |
| CN105021342A (en) | Ultrasonic non-intervention pressure detection method based on information fusion of plurality of transition waveforms | |
| CN106442744B (en) | A kind of ultrasonic signal processing method for removing ultrasonic probe response characteristic | |
| CN108120573A (en) | Time reversal super-resolution line leakage method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160810 Termination date: 20200524 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |