CN208780591U - A kind of multichannel wear particle detection device dividing multiplexing technology based on phase - Google Patents

Abstract

The utility model relates to a kind of multichannel wear particle detection devices for dividing multiplexing technology based on phase.The device makes have different initial phases by the sine wave signal of multiple sensor passages by phase shift, to which the wave crest of multiple signals be intercepted and be merged into output signal all the way, the acquisition of peak value is realized using synchronized sampling method, then the sine wave peak change amount of multiple sensor output signal is extracted, wear particle detection number of pulses and pulse amplitude in multiple sensor are obtained, the concentration and size of particle in oil liquid can be calculated.The utility model only needs sinusoidal input signal all the way and all the way output signal, reduces the cost of multichannel wear particle detection device, detection while realizing multiple sensor；Time division multiplexing multichannel wear particle detection sensor compared with the prior art, the operation of channel switching is not present in the signal processing of the utility model, therefore instantaneous voltage fluctuation interference will not be generated, thus for stablizing the time of output signal when saving channel switching.

Description

A kind of multichannel wear particle detection device dividing multiplexing technology based on phase

Technical field

The utility model belongs to alternating current signal detection field, and in particular to a kind of to divide the multichannel of multiplexing technology to grind based on phase Grain detection device.

Background technique

Lubricating oil is mechanical equipment " blood ", the important information comprising Wear Condition of Machinery, therefore in oil liquid Abrasive grain effectively detects, fault predictive position and state of wear.Research shows that normal wear particle size is 10 in oil liquid Micron then shows that certain mechanical movement failure generates hereinafter, when 10 microns or more amounts of particles increased significantly, when inordinate wear Desirable particle size is at 25-30 microns, and grit size is up to 100 microns or more when serious.Abrasive grain inspection based on inductance detection technology Sensor is surveyed since its structure is simple, ferromagnetic metal particle and non-ferromagnetic metal particle can be distinguished, and in oil liquid The advantages that nonmetallic inclusions such as moisture and bubble are insensitive becomes more practical and effective metal worn particle detection method, makes gold Belong to wear particle detection precision and reach 20-50 microns, but since sense channel size is smaller, seriously limits detection flows.

To improve detection flows, Du L, Zhe J.Parallel sensing of metallic wear debris in lubricants using undersampling data processing[J].Tribology International, 2012,53 (9): a kind of method that 28-34. proposes parallel multiple sensing channel realizes more sensings It is detected while device signal, impedance output signal is acquired using Undersampling technique, but which requires to distribute to each sensor One signal sampling channel.Du L,Zhu X,Han Y,et al.High Throughput Wear Debris Detection in Lubricants Using a Resonance Frequency Division Multiplexed Sensor[J] .Tribology Letters, 2013,51 (3): 453-460. is disclosed using frequency multiplexing technique, makes multiple working sensors At different frequencies, output signal obtains abrasive grain information by Fourier transformation, realizes single sense channel while reading multichannel Sensor signal.But since working sensor is in different driving frequencies, there is certain difference to the detection sensitivity of particle It is different.Zhu X,Du L,Zhe J.A3×3wear debris sensor array for real time lubricant oil conditioning monitoring using synchronized sampling[J].Mechanical Systems& Signal Processing, 2017,83:296-304. devise 3 × 3 abrasive grain sensor arrays, using time-division multiplex technology, Make working sensor in different time sections, detected while realizing 9 tunnel sensor signal, but which is at change detection channel There is apparent noise to introduce, need to guarantee enough signal stabilization times.

Utility model content

To solve to need when the prior art exists and needs inconsistent multiple sense channels, detection sensitivity, change detection channel The technical problems such as sufficiently stable time are wanted, the utility model proposes a kind of multichannel wear particle detections for dividing multiplexing technology based on phase Method and device thereof.

To achieve the above object, the utility model uses following technical scheme:

A kind of multichannel wear particle detection method for being divided multiplexing technology based on phase is believed by the sine wave that exciting signal source issues The sensor that load has abrasive grain oil liquid to be detected number is acted on, is included the following steps:

(1) sub-signal

The signal of exciting signal source is divided into the identical road n sine wave signal；

(2) phase shift is handled

The mobile road n sine wave makes it have different initial phases, for the road n sine wave signal, adjacent sine wave signal tool HavePhase difference；

(3) sensor detects

The road n sine wave signal after phase shift, which respectively corresponds, is input to the sensor that n load has abrasive grain oil liquid to be detected, when Metal worn particle in oil liquid can cause sine wave signal amplitude to change when passing through cell winding；

(4) signal synthesizes

After the road n sine wave signal after the phase shift passes through sensor, the sine of the wear particle detection of the interception road n sensor output Wave signal is higher than the waveform of setting current potential Vd, the setting current potentialA is sinusoidal wave amplitude in formula The road n after interception is higher than the Waveform composition output signal all the way of setting current potential Vd by value；

(5) signal acquisition

The output signal all the way of synthesis is acquired using synchronous sampling method, and data acquisition card and exciting signal source work are same Under one reference clock, for the road n sensor output signal, makes n times of frequency acquisition exciting signal frequency, pass through adjustment signal The phase of the sampling clock of capture card can collect the peak value of the output signal sine wave of synthesis, and sinusoidal crest value is proportional to biography Sensor impedance value；

(6) signal extraction

The road n sensor output signal, adjacent n peak value in the output signal all the way of acquisition are extracted from signal collected Respectively correspond the sine wave peak signal of the road n sensor output, thus by the collected peak value of output signal all the way successively etc. between Every being divided into n group, n group peak value is separately connected into curve, resulting n curve corresponds to the output signal of the road n sensor；

(7) Analysis of test results

By the sine wave peak change for analyzing n curve of the resulting corresponding road the n sensor output signal of signal extraction Amount, obtains wear particle detection number of pulses and pulse amplitude in n sensor, can calculate the concentration and ruler of particle in oil liquid Very little: wear particle concentration is equal to number of pulses and is positively correlated divided by the volume for flowing through sensor oil liquid, grit size and pulse amplitude, the two Numerical relation need to carry out curve fitting to obtain using actually detected result.

A kind of multichannel wear particle detection device dividing multiplexing technology based on phase, which is characterized in that including exciting signal source, divide Signaling module, phase shift block, sensor module, signal synthesizing module and signal acquisition and extraction module；Wherein:

The exciting signal source is for generating sine wave signal；

The sub-signal module receives the sine wave signal that exciting signal source generates, and the signal of exciting signal source is divided into The identical road n sine wave signal；Sub-signal module includes a voltage follower, defeated to exciting signal source to eliminate load variation Stabilization signal source output signal amplitude is played the role of in the influence of signal out, and the voltage follower connects n delivery outlet, uses To export the road n amplitude, frequency, the identical sine wave signal of phase to phase shift block；

The phase shift block receives the road the n amplitude of sub-signal module output, frequency, the identical sine wave signal of phase, and The initial phase of the identical sine wave signal in the movement road n, has adjacent sine wave signalPhase difference；Phase shift block includes one A amplifying circuit in the same direction and two phase-shift circuits, in-phase amplification circuit are used to for input signal being amplified to specified multiple, input letter Number amplification factor should be subject to the output signal amplitude of sensor output, pass through the times magnification for adjusting amplifying circuit in the same direction Number, makes the road n sensor when no detection abrasive grain passes through, and output sinusoidal magnitude is equal；The phase-shift circuit include resistance, Adjustable resistance, capacitor and operational amplifier, by adjust adjustable resistance resistance value, make input sine wave signal realize 0~ 180 ° of any angle phase shifts, the arbitrary phase that two phase-shift circuits complete 0~360 ° of sine wave signal are mobile；

The sensor module includes n and loads the sensor for having abrasive grain oil liquid to be detected, respectively corresponds and receives phase shift mould The road the n sine wave of block output, each sensor includes inductance capacitance antiresonant circuit and reverse amplification circuit；Inductance capacitance is simultaneously The impedance of connection resonance circuit is exported in a manner of reversely amplifying；

Further, the inductance capacitance antiresonant circuit is made of inductance coil and capacitor Cp, inductance coil etc. Effect is inductance Ls one resistance Rs of series connection, and inductance coil inductance can be caused when the metal worn particle in oil liquid passes through cell winding Ls variation, so as to cause resonant circuit impedance variation.

Further, the inductance coil of the n sensor uses identical specification, electricity identical with capacitance Hold the identical antiresonant circuit of formation in parallel, guarantees n sensor detection sensitivity having the same.

The sine wave signal of the road the n sensor output of the signal synthesizing module receiving sensor module output, signal close It include n diode and a summing circuit at module, n diode has one-way conduction effect, and only input signal is higher than It can be just connected when setting current potential Vd, the setting current potentialA is sinusoidal magnitude in formula, and n is a Diode intercepts the waveform that the road n sine wave signal is higher than setting current potential Vd, and the road n after interception is higher than setting current potential by summing circuit The Waveform composition of Vd output signal all the way；Since summing circuit is reverse amplification circuit, the wave packet that sine wave signal is intercepted Polarity is by just becoming negative；

Further, the diode is the detector diode with fast recovery characteristics.

The signal acquisition and extraction module pass through the defeated all the way of data acquisition card acquisition synthesis using synchronous sampling method The peak value of signal out, data acquisition card and exciting signal source work export for the road n sensor and believe under same reference clock Number, make n times of frequency acquisition exciting signal frequency, can be collected by the phase of the sampling clock of adjustment signal capture card The peak value of the sine wave of the output signal of synthesis, sinusoidal crest value are proportional to sensor impedance value；The output signal all the way of acquisition In adjacent n peak value respectively correspond the sine wave peak signal of the road n sensor output, therefore by the collected output signal arrived Peak value is successively divided into n group at equal intervals, n group peak value is separately connected into curve, n curve corresponds to the output signal of the road n sensor.

The beneficial effect of the utility model compared with prior art is:

1, the utility model wear particle detection method and apparatus only need sinusoidal input signal all the way and all the way output signal, Therefore the utility model does not increase the quantity of exciting signal source and signal sampling channel while increasing sense channel, drops The low cost of multichannel wear particle detection device；

2, multiple sensor detection coils in detection device can use identical specification, identical with capacitance Capacitor parallel connection forms identical antiresonant circuit, and due to working under identical driving frequency, multiple detection coils have phase Same detection sensitivity, so that the detection pulse data of multiple sensors to be converted into the size number of abrasive grain under same standard According to；It (otherwise needs individually to do quantitative test to each sensor, draws independent Sensor Output Characteristic curve, increase The workload of data processing)；

3, time division multiplexing multichannel wear particle detection sensor compared with the prior art, the signal processing mistake of the utility model The operation of channel switching is not present in journey, therefore will not generate instantaneous voltage fluctuation interference, uses when to saving channel switching In the time for stablizing output signal；

4, in compared with the prior art, the single period can only detect sensor signal all the way, and the utility model acquires All peak values of signal in multiple sensor, from the loss situation that signal may be not present, inspection while realizing multiple sensor It surveys, so as to constant in signal acquisition frequency and the case where guarantee output signal sampling number in single sensor units time Under, detect more multichannel sensor output data；(in order to guarantee completely to draw entire wear particle detection pulse, it need to guarantee single The sampling number of sensor output signal, the sample frequency of synchronous signal capture card make it is limited, therefore in signal acquisition frequency In the constant and guarantee single sensor units time in the case where output signal sampling number, it is defeated to can detecte more multiple sensor Data out.)

5, since signal acquisition used and extraction process are simple digital signal reading and division operation, to computer Computing resource consumption seldom, can achieve the real-time processing of data, be truly realized oil liquid abrasive grain real-time detection.

Based on the above reasons, the utility model can be applied to mechanical equipment Metals In Lubricating abrasive grain real-time detection and its His multiple paths of sine wave signals detection field.

Detailed description of the invention

In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts, It is also possible to obtain other drawings based on these drawings.

Fig. 1 is the flow diagram for the multichannel wear particle detection method that the utility model divides multiplexing technology based on phase；

Fig. 2 is the four-way for dividing the multichannel wear particle detection method of multiplexing technology in the utility model embodiment 1 based on phase The treatment process schematic illustration of sensor signal；

Fig. 3 is the schematic illustration that signal acquisition process uses synchronized sampling in Fig. 2, and Fig. 3 (h) is to include grain signal Sine wave, Fig. 3 (i) are the detection pulse signal of abrasive grain；

Fig. 4 is signal extraction schematic illustration in Fig. 2；

Fig. 5 (a) is the structural schematic diagram for the multichannel wear particle detection device that the utility model divides multiplexing technology based on phase；Figure 5 (b) be the structural schematic diagram for dividing the four-way wear particle detection device of multiplexing technology in the utility model embodiment 1 based on phase；

Fig. 6 is the structural schematic diagram of sub-signal module in Fig. 5 (b)；

Fig. 7 is the structural schematic diagram of phase shift block in Fig. 5 (b)；

Fig. 8 is the structural schematic diagram of sensor die in Fig. 5 (b)；

Fig. 9 is the structural schematic diagram of signal synthesizing module in Fig. 5 (b)；

Figure 10 is to divide the four-way wear particle detection device of multiplexing technology to detect using based on phase in the utility model embodiment 1 Single various sizes of iron abrasive grain passes through the testing result of No. four sensors respectively in different times；

Figure 11 is to divide the four-way wear particle detection device of multiplexing technology to detect using based on phase in the utility model embodiment 1 Testing result of the size in the iron abrasive grain of 50~100 μ ms.

Specific embodiment

It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can To be combined with each other.The utility model will be described in detail below with reference to the accompanying drawings and embodiments.

It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched The embodiment stated is only the utility model a part of the embodiment, instead of all the embodiments.Below at least one example The description only actually of property embodiment be it is illustrative, never as to the utility model and its application or any limit used System.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without making creative work The every other embodiment obtained, fall within the protection scope of the utility model.

It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root According to the illustrative embodiments of the utility model.As used herein, unless the context clearly indicates otherwise, otherwise singular Form be also intended to include plural form, additionally, it should be understood that, when in the present specification use term "comprising" and/or When " comprising ", existing characteristics, step, operation, device, component and/or their combination are indicated.

Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments Up to the unlimited the scope of the utility model processed of formula and numerical value.Simultaneously, it should be clear that for ease of description, each shown in attached drawing The size of a part is not to draw according to actual proportionate relationship.Skill known for person of ordinary skill in the relevant Art, method and apparatus may be not discussed in detail, but in the appropriate case, and the technology, method and apparatus should be considered as awarding Weigh part of specification.In shown here and discussion all examples, example should be construed as merely by appointing to occurrence Property, not as limitation.Therefore, the other examples of exemplary embodiment can have different values.It should also be noted that similar Label and letter similar terms are indicated in following attached drawing, therefore, once be defined in a certain Xiang Yi attached drawing, then with In attached drawing afterwards do not need that it is further discussed.

In the description of the present invention, it should be understood that the noun of locality such as " front, rear, top, and bottom, left and right ", " laterally, Vertically, vertically, it is horizontal " and " pushing up, bottom " etc. indicated by orientation or positional relationship be normally based on orientation or position shown in the drawings Relationship is set, is merely for convenience of describing the present invention and simplifying the description, in the absence of explanation to the contrary, these nouns of locality Do not indicate that and imply that signified device or element must have a particular orientation or be constructed and operated in a specific orientation, because This should not be understood as the limitation to scope of protection of the utility model: the noun of locality " inside and outside " refers to the wheel relative to each component itself Wide is inside and outside.

For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ", " ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction " Side " or " under its device or construction ".Thus, exemplary term " ... top " may include " ... top " and " in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and And respective explanations are made to the opposite description in space used herein above.

In addition, it should be noted that, limiting components using the words such as " first ", " second ", it is only for be convenient for Corresponding components are distinguished, do not have Stated otherwise such as, there is no particular meanings for above-mentioned word, therefore should not be understood as to this The limitation of utility model protection range.

Embodiment 1

In the present embodiment by taking four-way wear particle detection sensor as an example, bound fraction illustrates the utility model and is based on phase Divide the multichannel wear particle detection method and device of multiplexing technology.

A kind of multichannel wear particle detection method for being divided multiplexing technology based on phase, (is adopted by exciting signal source in the present embodiment With the waveform generator of NI company PXI-5441 type) issue sine wave signal act on load have abrasive grain oil liquid to be detected Sensor, the treatment process principle of sensor signal as shown in Fig. 2, Fig. 2 (a) is the sine wave signal that exciting signal source issues, Fig. 2 (b) is the four road sine wave signals separated after sub-signal by the sine wave signal that exciting signal source issues, and Fig. 2 (c) is to move Tetra- road sine wave signal of phase Hou, Fig. 2 (d) are tetra- road sine wave signal of the same coordinate system Xia, and Fig. 2 (e) is after intercepting peak value Four tunnel signal waveforms, Fig. 2 (f) is that interception tetra- road signal of peak value Hou synthesizes output signal all the way, and Fig. 2 (g) is practical defeated Reverse signal out；

As shown in Figure 1, dividing the multichannel wear particle detection method of multiplexing technology based on phase, include the following steps:

(1) sub-signal

The sine wave signal (Fig. 2 (a)) of exciting signal source is divided into identical four road sine wave signal (Fig. 2 (b))；

(2) phase shift is handled

Mobile four road sine waves make it have different initial phases, for the road n sine wave signal, adjacent sine wave signal tool HavePhase difference；For four road sine wave signals, adjacent sine wave has 90 ° of phase difference；Such as Fig. 2 (c) and Fig. 2 (d) Shown, wherein Fig. 2 (d) is that tetra- road sine wave of Fig. 2 (c) Zhong is placed on the figure drawn under same coordinate system；

(3) sensor detects

Tetra- road sine wave signal of phase shift Hou, which respectively corresponds, is input to the sensor that four loads have abrasive grain oil liquid to be detected, Sine wave signal amplitude can be caused to change when the metal worn particle in oil liquid passes through cell winding, sensor exports sine wave letter The variation delta Vout of number amplitude is proportional to sensor impedance variation delta Z:

(4) signal synthesizes

After four road sine wave signals after the phase shift pass through sensor, interception sine wave signal is higher than the wave of setting current potential Vd Shape, the i.e. signal of (Fig. 2 (d)), the setting current potentialA is sinusoidal magnitude, interception in formula Shown in tetra- road signal such as Fig. 2 (e) of Hou, Waveform composition of tetra- tunnel Hou higher than setting current potential Vd output signal all the way will be intercepted, As shown in Fig. 2 (f), using above-mentioned signal processing, so that it may which the impedance information of No. four sensors is merged into output signal all the way；

(5) signal acquisition

The output signal all the way of synthesis is acquired using synchronous sampling method, and the principle of synchronous sampling method is as shown in figure 3, make Data acquisition card NI PXIe-6124 and exciting signal source work under same reference clock, for single channel output signal, Its output signal only includes the information of sensor signal all the way, sample frequency should be made to be equal to exciting signal frequency, to make to sample Cycle T s is equal to excitation restricting the number cycle T e.No. four sensor output signals are needed in the present embodiment, so that data acquisition card should be made Frequency acquisition be four times of exciting signal frequency.By the phase of the sampling clock of adjustment signal capture card can collect as It include the sinusoidal crest value of grain signal shown in Fig. 3 (h), sinusoidal crest value, which is proportional to sensor impedance value, will collect peak point A curve is connected into, which is exactly sensor impedance change curve, i.e. the metal worn particle detection pulse signal of sensor is bent Line, as shown in Fig. 3 (i)；

(6) signal extraction

As shown in figure 4, extract No. four sensor output signals from the signal collected (Fig. 2 (g)), acquisition it is defeated all the way Adjacent four peak values respectively correspond the sine wave peak signal of No. four sensors output in signal out, therefore arrive collected Output signal peak value is successively divided into four groups at equal intervals, and four groups of peak values are separately connected into curve, the corresponding four tunnels sensing of four curves The output signal of device；

(7) Analysis of test results

Sinusoidal crest value by analyzing four curves of the resulting correspondence No. four sensor output signal of signal extraction becomes Change amount obtains wear particle detection number of pulses and pulse amplitude in four sensors, can calculate in oil liquid the concentration of particle and Size: wear particle concentration is equal to number of pulses and is positively correlated divided by the volume for flowing through sensor oil liquid, grit size and pulse amplitude, and two Person's numerical relation need to carry out curve fitting to obtain using actually detected result.

A kind of multichannel wear particle detection device for dividing multiplexing technology based on phase of the utility model, as shown in Fig. 5 (a).This reality Applying in example is four-way wear particle detection device, as shown in Fig. 5 (b), including exciting signal source, sub-signal module, phase shift block, biography Sensor module, signal synthesizing module and signal acquisition and extraction module；Wherein:

Exciting signal source is a sine wave exciting signal generating device, uses NI company PXI-5441 class in the present embodiment The waveform generator of type, for generating sine wave signal；

As shown in fig. 6, the sub-signal module receives the sine wave signal that exciting signal source generates, and by exciting signal source Signal be divided into identical four road sine wave signal, as Fig. 2 (a) arrive Fig. 2 (b) process；Sub-signal module includes a voltage follow Device plays the work of stabilization signal source output signal amplitude to eliminate influence of the load variation to exciting signal source output signal With, the voltage follower connects four delivery outlets, to export four tunnel amplitudes, frequency, the identical sine wave signal of phase to Phase shift block；

As shown in fig. 7, the four tunnel amplitudes, frequency, phase that the phase shift block receives the output of sub-signal module are identical just String wave signal, and the initial phase of the identical sine wave signal in mobile four tunnels, make adjacent sine wave signal have 90 ° of phase difference, such as Fig. 2 (b) arrives the signal processing of Fig. 2 (c, d)；Include amplifying circuit 1 in the same direction, phase-shift circuit I 2, phase shift electricity in phase shift block Road II 3, in-phase amplification circuit 1 are used to adjust the output sine wave signal amplitude of sensor output, are not having No. four sensors When having detection abrasive grain to pass through, output sinusoidal magnitude is equal；Phase-shift circuit I 2 and phase-shift circuit II 3 are for completing 0~360 ° Arbitrary phase it is mobile, for phase-shift circuit I 2 or the single phase-shift circuit of phase-shift circuit II 3, including resistance R1, resistance R2, adjustable Resistance R3, capacitor C and operational amplifier, wherein R1=R2 can make the sine wave letter of input by adjusting adjustable resistance R3 resistance value Number realize 0~180 ° of any angle phase shift, as the adjustable resistance R in phase-shift circuit₃Resistance value be 0, the phase shift of signal Moving is 180 °, as adjustable resistance R₃Resistance value be infinity, the phase shift of signal is 0 °；

As shown in figure 8, the sensor module, which includes four, loads the sensor for having abrasive grain oil liquid to be detected, respectively correspond Four road sine waves of phase shift block output are received, the detection coil of four sensors uses identical specification, with capacitance Identical capacitor parallel connection forms identical antiresonant circuit, due to working under identical driving frequency, four detection coils Detection sensitivity having the same.Each sensor includes inductance capacitance antiresonant circuit and reverse amplification circuit；It is wherein electric Electrification holds antiresonant circuit and is made of simultaneously inductance coil and capacitor Cp, and inductance coil is equivalent to one resistance Rs of inductance Ls series connection Metal worn particle in liquid can cause inductance coil inductance Ls to change when passing through cell winding, so as to cause resonant circuit impedance change Change, antiresonant circuit impedance is exported in a manner of reversely amplifying.Since antiresonant circuit is connected across the fortune of reverse amplification circuit It calculates between amplifier out and inverting input terminal, it is humorous that the variation delta Vout of output signal amplitude is proportional to antiresonant circuit Shake circuit impedance variation delta Z:

As shown in figure 9, the sine wave signal that No. four sensors of the signal synthesizing module receiving sensor module export, Signal synthesizing module includes four diodes and a summing circuit, completes the signal processing mistake from Fig. 2 (c, d) to Fig. 1 (g) Journey.Four diodes have one-way conduction effect, can just be connected when only input signal is higher than setting current potential Vd, the setting electricity PositionA is sinusoidal magnitude in formula, and four diodes four road sine wave signals of interception, which are higher than, to be set The waveform for determining current potential Vd makes sine wave shown in Fig. 2 (c, d) be truncated to wave packet shown in Fig. 2 (e)；After summing circuit will intercept Four tunnels be higher than the Waveform composition output signal all the way of setting current potential Vd, i.e., four road signal of Fig. 2 (e) is directly synthesized into Fig. 2 (g) Shown in output signal all the way.Since summing circuit is reverse amplification circuit, the wave packet polarity that sine wave signal is intercepted is by just Become negative, signal shown in Fig. 2 (f) simply to illustrate that signal processing principle, do not occur in actual signal treatment process.

The signal acquisition and extraction module are acquired using synchronous sampling method by data acquisition card NI PXIe-6124 The peak value of the output signal all the way of synthesis module output, data acquisition card and exciting signal source work under same reference clock, For No. four sensor output signals, makes four times of frequency acquisition exciting signal frequency, pass through adopting for adjustment signal capture card The phase of sample clock can collect the peak value of the sine wave of the output signal of synthesis, and sinusoidal crest value is proportional to sensor impedance Value；Adjacent four peak values respectively correspond the sine wave peak signal of No. four sensors output in the output signal all the way of acquisition, because This by it is collected to output signal peak value be successively divided into four groups at equal intervals, four groups of peak values are separately connected into curve, four The output signal of corresponding No. four sensors of curve.Signal acquisition is all completed in LabVIEW software with extraction, is truly realized The real-time processing of data.

As shown in Figure 10, using above-mentioned four-way wear particle detection device, various sizes of single metal abrasive grain is carried out respectively Detection, size is respectively 85 μm, 90 μm, 87 μm, 74 μm of iron abrasive grain is respectively in different times by four road cell windings It is detected, as a result as shown in Figure 10 (a), Figure 10 (b), Figure 10 (c), Figure 10 (d), downward pulse represents abrasive grain and causes in figure Impedance variation amount, grit size is bigger, and the pulse amplitude of generation is bigger.This quasi- dynamic experiment process is to make various sizes of iron Abrasive grain respectively by four sensors, can obtain the output information of No. four sensors, and four tunnels pass in different times simultaneously Sensor detects the amplitude of pulse and grit size is positively correlated.The detection in single channel does not interfere with other sense channels, detects Process is independent from each other, there is no mutual interference, demonstrate using the device carry out No. four sensors simultaneously detect can Row.

As shown in figure 11, using above-mentioned four-way wear particle detection device, carrying out size range in oil liquid is 50~100 μm of grain Iron wear particle detection.This dynamic experiment process, the iron abrasive grain by size in 50~100 μ ms are uniformly suspended in oil liquid, are driven Flows through sensor, the detection signal of No. four sensors are as shown below simultaneously for dynamic oil liquid, it can be seen that No. four sensors are defeated simultaneously The detection pulse for having gone out abrasive grain passes through analysis number of pulses and pulse amplitude, it can calculate the concentration and size of abrasive grain.

The utility model devises the multichannel wear particle detection method and apparatus for dividing multiplexing technology based on phase.It is multiple using phase point With technology, the sine wave signal of multiple sensors is made to be staggered in phase, so as to intercept the wave of multiple signals peak fractions Shape is merged into output signal all the way.Output signal peak value is acquired using synchronous sampling technique.The method for extracting signal be used for from Four tunnel sensor signals are extracted in output signal, to draw four road sensor detection signal curves.

Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new The range of each embodiment technical solution of type.

Claims (4)

1. a kind of multichannel wear particle detection device for dividing multiplexing technology based on phase, which is characterized in that including exciting signal source, point letter Number module, phase shift block, sensor module, signal synthesizing module and signal acquisition and extraction module；Wherein:

The exciting signal source is for generating sine wave signal；

The sub-signal module receives the sine wave signal that exciting signal source generates, and the signal of exciting signal source is divided into identical The road n sine wave signal；Sub-signal module includes a voltage follower, is believed to eliminate load variation and export to exciting signal source Number influence, play the role of stabilization signal source output signal amplitude, the voltage follower connects n delivery outlet, to defeated The identical sine wave signal of the road n amplitude, frequency, phase is to phase shift block out；

The phase shift block receives the road the n amplitude of sub-signal module output, frequency, the identical sine wave signal of phase, and mobile n The initial phase of the identical sine wave signal in road, has adjacent sine wave signalPhase difference；Phase shift block includes one same To amplifying circuit and two phase-shift circuits, in-phase amplification circuit is used to input signal being amplified to specified multiple, input signal Amplification factor should be subject to the output signal amplitude of sensor output, by adjusting the amplification factor of amplifying circuit in the same direction, make n For road sensor when no detection abrasive grain passes through, output sinusoidal magnitude is equal；The phase-shift circuit includes resistance, adjustable electric Resistance, capacitor and operational amplifier keep 0~180 ° of the sine wave signal realization of input any by adjusting the resistance value of adjustable resistance Angular phase is mobile, and the arbitrary phase that two phase-shift circuits complete 0~360 ° of sine wave signal is mobile；

The sensor module includes n and loads the sensor for having abrasive grain oil liquid to be detected, and it is defeated to respectively correspond reception phase shift block The road n out, each sensor include inductance capacitance antiresonant circuit and reverse amplification circuit；Inductance capacitance antiresonant circuit Impedance is exported in a manner of reversely amplifying；

The sine wave signal of the road the n sensor output of the signal synthesizing module receiving sensor module output, signal synthesize mould Block includes n diode and a summing circuit, and n diode has one-way conduction effect, and only input signal is higher than setting It can be just connected when current potential Vd, the setting current potentialA is sinusoidal magnitude, n two poles in formula Pipe intercepts the waveform that the road n sine wave signal is higher than setting current potential Vd, and the road n after interception is higher than setting current potential Vd's by summing circuit Waveform composition output signal all the way；Since summing circuit is reverse amplification circuit, the polarity for the wave packet that sine wave signal is intercepted By just becoming negative；

The signal acquisition and extraction module are believed using synchronous sampling method by the output all the way of data acquisition card acquisition synthesis Number peak value, data acquisition card and exciting signal source work under same reference clock, for the road n sensor output signal, make Frequency acquisition is n times of exciting signal frequency, can collect synthesis by the phase of the sampling clock of adjustment signal capture card Output signal sine wave peak value, sinusoidal crest value is proportional to sensor impedance value；Phase in the output signal all the way of acquisition Adjacent n peak value respectively corresponds the sine wave peak signal of the road n sensor output, therefore by the collected output signal peak value arrived Successively it is divided into n group at equal intervals, n group peak value is separately connected into curve, n curve corresponds to the output signal of the road n sensor.

2. a kind of multichannel wear particle detection device for dividing multiplexing technology based on phase according to claim 1, which is characterized in that The inductance capacitance antiresonant circuit of the sensor module is made of simultaneously inductance coil and capacitor, and inductance coil is equivalent to inductance It connects a resistance, inductance coil inductance can be caused to change when the metal worn particle in oil liquid passes through cell winding, to draw Play resonant circuit impedance variation.

3. a kind of multichannel wear particle detection device for dividing multiplexing technology based on phase according to claim 2, which is characterized in that The inductance coil of n sensor of the sensor module uses identical specification, and capacitor identical with capacitance is in parallel Identical antiresonant circuit is formed, guarantees n sensor detection sensitivity having the same.

4. a kind of multichannel wear particle detection device for dividing multiplexing technology based on phase according to claim 1, which is characterized in that The diode of the signal synthesizing module is the detector diode with fast recovery characteristics.