CN209043758U - A kind of multichannel wear particle detection device based on time-division multiplex technology - Google Patents
A kind of multichannel wear particle detection device based on time-division multiplex technology Download PDFInfo
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- CN209043758U CN209043758U CN201821525690.2U CN201821525690U CN209043758U CN 209043758 U CN209043758 U CN 209043758U CN 201821525690 U CN201821525690 U CN 201821525690U CN 209043758 U CN209043758 U CN 209043758U
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Abstract
The utility model relates to a kind of multichannel wear particle detection device based on time-division multiplex technology.The utility model generates sine wave signal by exciting signal source and is loaded on the sensor of the road n, it is generated by sampling clock generation module and uses clock signal, the synchronizing clock signals that signal source issues are processed into square-wave signal by square wave generation module, one stage signal synthesis module, second signal synthesis module and signal acquisition and extraction module, amplitude of the oil liquid for flowing through sensor comprising that can change sensor output signal when metallic particles is extracted in acquisition, detects the information of metal worn particle.The utility model is based on time division multiplexing principle, make n working sensor section in different times, the road n sine wave signal is raised respectively in n period, the signal for being higher than sinusoidal magnitude in the interception road n signal synthesizes signal output all the way, which is the peak change information for including the road n sine wave.
Description
Technical field
The utility model belongs to coil inductance detection field, and in particular to a kind of multichannel mill based on time-division multiplex technology
Grain detection device.
Background technique
To reduce equipment wearing, generallys use lubricating oil and carry out lubricating machinery equipment friction pair, reduce mechanical abrasion
Degree.In mechanical equipment operation process, the metal worn particle that secondary abrasion generates that rubs can enter in lubricating oil.The degree of wear and mill
It is different to damage type, the metal worn particle feature of generation is also different, and the feature according to wear particle can estimate the mill of mechanical equipment
Damage degree.In addition, the metal worn particle accumulation in lubricating oil will cause lubricating oil quality decline, therefore to Metals In Lubricating particle
Effective monitoring, important references can be provided for the management service of mechanical equipment.
Mainly there are granule technology device, Spectral Analysis Technology, spectral analysis technique to the detection method of metal worn particle at present.But
Be these traditional metal worn particle detection techniques be all off-line type detection, the state of wear of lubricating oil cannot be detected in time, therefore
It is necessary to provide a kind of online metal worn particle detection methods.Wear particle detection sensor based on inductance detection technology, due to knot
Structure is simple, can distinguish the advantages that ferromagnetic metal particle and non-ferromagnetic metal particle, becomes more practical and effective metal
Wear particle detection method.To detect minute metallic abrasive grain, unicoil wear particle detection sensor, three-winding wear particle detection sensor, band
The inductance coil sensor of iron core is developed, and realizes high-precision using the method for alternating current or direct current electric excitation and detection
Metal worn particle detection.But in order to detect minute metallic particle, the detection zone size needs of sensor are designed very small,
Limit detection flows.
In order to improve detection flows without losing detection accuracy, multiple existing wear particle detection sensors are detected simultaneously
Method is used for metal worn particle detection.Du L.et al.High Throughput Wear Debris Detection in
Lubricants Using a Resonance Frequency Division Multiplexed Sensor [J]
.Tribology Letters, 2013,51 (3): 453-460. propose a kind of multichannel sensor based on frequency multiplexing technique
Simultaneous Detection makes multiple working sensors at different frequencies, and output signal obtains abrasive grain information by Fourier transformation,
It realizes single sense channel while reading multiple sensor signal.But since working sensor is in different driving frequencies,
There is certain difference to the detection sensitivity of particle.Zhu X.et al.A 3×3wear debris sensor array for
real time lubricant oil conditioning monitoring using synchronized sampling
When [J] .Mechanical Systems and Signal Processing, 2017,83:296-304. propose one kind and are based on
The multichannel wear particle detection method of point principle of multiplexing, the basic ideas of multichannel wear particle detection be using analog switch, circulation according to
The secondary multiple sensors of conducting, make the single period there was only working sensor all the way, so as to realize multiple sensor signal
It detects simultaneously.This method the problem is that, in the moment of analog switch switching channel, output signal can generate disturbing for moment
It is dynamic, need the enough stable time to carry out stabilization signal amplitude.
Utility model content
To solve the problems, such as that prior art multisensor sensitivity is inconsistent and output signal needs the sufficiently stable time, this
Utility model proposes a kind of multichannel oil liquid abrasive grain detection method and device based on time-division multiplex technology.It is former based on time division multiplexing
Reason, makes multiple working sensors section in different times, i.e., the detection process of multiple sensors is staggered in time.In order to
Multiple sensor signal only is detected with signal sampling channel all the way, the peak value of multiple sensor sine wave signal is intercepted out,
And synthesize output signal all the way.
To achieve the above object, the utility model uses following technical scheme:
A kind of multichannel oil liquid abrasive grain detection method based on time-division multiplex technology, the sine issued by exciting signal source
Wave excitation signal function is on the n sensor that load has abrasive grain oil liquid to be detected, which is characterized in that steps are as follows:
(1) sub-signal
The sine wave signal of the sending of exciting signal source is divided into the identical road n+1 sine wave signal, wherein the road n is sinusoidal
Wave signal is separately input to the road n sensor, and 1 road sine wave signal is processed into sampled clock signal；
(2) sensor detects
Load has n sensor of abrasive grain oil liquid to be detected, respectively corresponds the road the n sine wave letter for receiving sub-signal output
Number, sine wave signal is generated by exciting signal source and is applied on the sensor of the road n, when flowing through the oil liquid of sensor comprising metallic particles
The amplitude of sensor output signal can be changed；
(3) sampled clock signal generates
The 1 road sine wave signal that exciting signal source is separated through sub-signal after 90 ° of phase shift by, using zero balancing, obtaining
The sampled clock signal of identical frequency, the peak value of the rising edge respective sensor output sine wave of the square wave of sampled clock signal
Point；
(4) road n square-wave signal generates
The synchronizing clock signals that exciting signal source issues are processed into the road n square-wave signal, the period phase of the road n square-wave signal
Together, n times of the sine wave signal period for being that exciting signal source generates, in the n period of sine wave exciting signal, the road n square wave
Successively there is high level, high level only lasts for the time in 1 period of sine wave exciting signal；
Further, the high level voltage is 3.3-5V.
Further, it is described by synchronizing clock signals be processed into square-wave signal include two divided-frequency, counting, output multi-channel
Four square-wave signal, reverse phase steps, two divided-frequency are to expand the period of synchronizing clock signals using two-stage system counter to be twice, i.e.,
It is twice the expansion of high level duration, high level is made to continue the time of an exciting signal source output sine wave period；It is logical
It crosses to count and be counted using rising edge of the required system Counter to the square wave after two divided-frequency, after n square wave, count, recycle again
Export n binary number；Output multi-channel square-wave signal is to receive n binary number using decoder, and output phase answers square wave；Instead
Phase device is that decoder is exported the high level in square wave to become low level, and low level becomes high level；
Further, the multiple paths of square signals for n greater than 10 generates, and the side of synchronizing clock signals is received using single-chip microcontroller
Wave counts and exports the road n square-wave signal.
(5) one stage signal synthesizes
The road the n sine wave signal that n sensor exports successively is synthesized with the road n square-wave signal respectively, carries out level-one
Signal synthesis, the road n square-wave signal by the road the n sine wave signal of sensor in n period for will successively be raised；
(6) second signal synthesizes
Sensor exports sine wave signal when passing through in the road the n sine wave signal after one stage signal is synthesized higher than no abrasive grain
The portion intercepts of amplitude come out, and the road the n sine wave signal after interception is then synthesized output signal all the way, described to export all the way
Signal is the wave crest change information for including the road n sensor output sine wave；
(7) signal acquisition
The peak value of the output signal all the way of synthesis is acquired using synchronous sampling method, is believed using the sampling clock that processing obtains
Number control data acquisition card, acquires the peak value of the output signal all the way of synthesis, the frequency of sampled clock signal and synthesis are all the way
The frequency that output signal medium wave peak occurs is identical, therefore need to only adjust the phase of sampling clock, it can collects the one of synthesis
The peak value of road output signal sine wave, sinusoidal crest value are proportional to sensor impedance value；
(8) signal extraction
The road n sensor output signal, adjacent n peak in the output signal all the way of acquisition are extracted from signal collected
Value respectively corresponds the sine wave peak signal of the road n sensor output, therefore successively etc. by the collected peak value of output signal all the way
Interval is 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；
(9) 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 based on time-division multiplex technology, which is characterized in that including exciting signal source, divide
Signaling module, sampling clock generation module, sensor module, square wave generation module, one stage signal synthesis module, second signal close
At module, signal acquisition and extraction module, in which:
The exciting signal source is used to generate sine wave exciting signal and synchronizing clock signals,
The sub-signal module receives the sine wave exciting signal that signal source generates, and the signal of exciting signal source is divided into
The identical sine wave exciting signal in the road n+1, wherein the road n sine wave signal is separately input to the road n sensor, 1 road sine wave signal
It is input to sampling clock generation module；Sub-signal module includes a voltage follower, to eliminate load variation to pumping signal
The influence of source output signal, plays the role of stabilization signal source output signal amplitude, and the voltage follower connects n+1 output
Mouthful, to export the road n+1 amplitude, frequency, the identical sine wave signal of phase；
The sampling clock generation module includes phase shift electricity for generating sampled clock signal, sampling clock generation module
Road, zero-crossing comparator, the phase-shift circuit includes resistance, adjustable resistance, capacitor and operational amplifier, by adjusting adjustable resistance
Resistance value, so that the sine wave signal of input is realized 0~180 ° of any angle phase shift, phase-shift circuit will be for will receive sub-signal
1 road sine wave signal of module output is 90 ° mobile；1 road sine wave signal is processed into square-wave signal by zero-crossing comparator, that is, is sampled
Clock signal, the peak value of the sine wave signal of the square wave rising edge respective sensor output of sampled clock signal, so as to logical
The data acquisition card of oversampling clock signal control signal acquisition module collects the defeated all the way of second signal synthesis module output
The peak value of signal out；
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 signal of block output, each sensor includes inductance capacitance antiresonant circuit and see-saw circuit；Inductance electricity
Hold antiresonant circuit impedance to export in a manner of reverse phase amplification；
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 road the n square wave generation module receives the synchronizing clock signals that exciting signal source issues, and generates the road n with synchronised clock
Square-wave signal, the road n square wave generation module include binary counter, n system Counter, n system decoder and phase inverter, described
Binary counter is 2 times of the sine-wave excitation signal period for increasing the period for inputting synchronizing clock signals, makes the road side n
The high level of wave signal continues a sine wave exciting signal period；The n system Counter, connects the defeated of binary counter
Out, for counting the square wave quantity of binary counter output, circulation output 0~n-1 of bit number, the binary number 0
~n-1 sends n system decoder to, and for generating the road n square-wave signal, the road n square-wave signal feature is that there was only one in n period
A period is low level, other periods are high level, and the high level of square-wave signal is made to become low level after handling using phase inverter,
Low level becomes high level；
Further, the n is the integer of 1-10.
Further, when the n is greater than 10, square wave generation module uses single-chip microcontroller.
Further, the high level voltage is 3.3-5V.
The one stage signal synthesis module includes n summing circuit, for by the square wave of the received road n square wave generation module
Signal carries out one-to-one correspondence with the sine wave signal that the road n sensor module exports and synthesizes；
The second signal synthesis module includes n diode and a summing circuit, and n diode respectively corresponds reception
The road the n sine wave signal of the synthesis of one stage signal synthesis module output, n diode have one-way conduction effect, make received
The signal for being higher than the sinusoidal magnitude exported when sensor module is passed through without abrasive grain in the road the n sine wave signal of synthesis passes through, and cuts
Take be higher than sensor module without abrasive grain by when the signal of sinusoidal magnitude that exports obtain the interception after the road n sine wave letter
Number, the road the n sine wave signal after interception is synthesized by signal output all the way by summing circuit；
Further, the diode is the detector diode with fast recovery characteristics.
The signal acquisition and extraction module, for acquiring and extracting the peak value of the output of signal all the way.The module
Comprising data acquisition card, computer and signal acquisition therein and extraction procedure, signal acquisition and extraction procedure use LabVIEW
Software programming, and draw the output signal curve of the road n sensor.
The principles of the present invention are as follows:
It generates sine wave signal by exciting signal source to be loaded on the sensor of the road n, the oil liquid for flowing through sensor includes metal
The amplitude of sensor output signal can be changed when particle, therefore sensor output sine wave signal includes the information of metal worn particle.
In n period, the road n sine wave signal is raised respectively, and the signal intercepted in the signal of the road n higher than sinusoidal magnitude synthesizes
Signal exports all the way, which is the peak change information for including the road n sine wave.
The beneficial effect of the utility model compared with prior art is:
1, compared to frequency division multiplexing multichannel wear particle detection technology, the multichannel sensor of the utility model works identical
Under frequency, according to the sensor of identical parameters, then identical detection sensitivity can be obtained；
2, compared to the time division multiplexing multichannel wear particle detection method using analog switch change detection channel, this is practical new
Type does not need the stabilization time of signal fluctuation when switching channel, so as to the case where guaranteeing single sense channel sampling number
Under, it is detected while realizing larger amt sensor signal；
3, for the road n≤10 square-wave signal, an output signal amplitude only need to be acquired between each high period, therefore not
When needing excessive sense channel, data volume to be treated can be reduced by modifying sample frequency；
It, can be according to the utility model below the tunnel n≤10 4. the number of channels of method described in the utility model can be selected voluntarily
Suitably modified component model, required component are cheap；It more than 10 tunnels needs to complete multiple paths of square signals using single-chip microcontroller
It generates, and need to be programmed in single-chip microcontroller, price is slightly higher.
Based on the above reasons, the utility model can be applied to the real-time detection of mechanical equipment Metals In Lubricating abrasive grain.
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 chart of multichannel oil liquid abrasive grain detection method of the utility model based on time-division multiplex technology；
Fig. 2 is 10 channel sensor oil liquid abrasive grain detection sides in the utility model embodiment 1 based on time-division multiplex technology
The schematic diagram of method signal processing；
Fig. 3 is the 10 channel sensor oil liquid abrasive grains detection dress in the utility model embodiment 1 based on time-division multiplex technology
The structural schematic diagram set；
Fig. 4 is the structural schematic diagram of the sensor of sensor module in Fig. 3；
Fig. 5 is in Fig. 3 be clock generation module phase-shift circuit structural schematic diagram；
In figure: 1, exciting signal source, 2, sub-signal module, 3, sensor module, 4,10 road square-wave signal output modules, 5,
One stage signal synthesis module, 6, second signal synthesis module, 7, sampling clock generation module, 8, signal acquisition and extraction module.
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 10 channel wear particle detection sensors as an example, illustrate that one kind of the utility model is based on time division multiplexing
The multichannel oil liquid abrasive grain detection method and device of technology.
As depicted in figs. 1 and 2, a kind of multichannel oil liquid abrasive grain detection method based on time-division multiplex technology is based on the time-division
Principle of multiplexing, makes multiple working sensors section in different times, i.e., the detection process of multiple sensors is staggered in time.For
Multiple sensor signal only can be detected with signal sampling channel all the way, we are by the peak value of multiple sensor sine wave signal
Interception comes out, and synthesizes output signal all the way, specific steps are as follows:
(1) sub-signal
In order to detect the peak change amount of 10 road sine waves, by the same sine wave signal VinIt is divided into 11 tunnels just
String wave signal, wherein sine wave signal is separately input on No. 10 sensors, and 1 road sine wave signal is processed into sampling clock letter
Number；
(2) sensor detects
Load has 10 sensors of abrasive grain oil liquid to be detected, respectively corresponds the 10 road sine waves letter for receiving sub-signal output
Number, flow through amplitude of the oil liquid of sensor comprising sensor output signal can be changed when metallic particles；
(3) sampled clock signal generates
The 1 road sine wave signal that exciting signal source is separated through sub-signal after 90 ° of phase shift by, using zero balancing, obtaining
The sampled clock signal of identical frequency, the peak value of the rising edge respective sensor output sine wave of the square wave of sampled clock signal
Point；
(4) 10 road square-wave signals generate
The synchronizing clock signals that exciting signal source is issued are through two divided-frequency, counting, output multi-channel square-wave signal, reverse phase four
For step process at 10 road square-wave signal Y0~Y9, two divided-frequency is to expand the period of synchronizing clock signals using two-stage system counter
One times, even if the expansion of high level duration is twice, high level is made to continue an exciting signal source output sine wave period
Time；It is counted by counting using rising edge of the decade counter to the square wave after two divided-frequency, after 10 square waves, is counted again
Number, circulation 10 tetrads 0~9 of output；Output multi-channel square-wave signal is to receive 10 using binary coded decimal decoder
A tetrad, and output phase answers square wave；Phase inverter is that decoder is exported the high level in square wave to become low level, low
Level becomes high level.
The period of 10 road square-wave signal Y0~Y9 is identical, is the 10 of the sine wave signal period that exciting signal source generates
Times, sine wave signal Vin10 periods in, successively there is high level in 10 road square-wave signal Y0~Y9, and high level is 3.3-5V,
Only last for sine wave signal Vin1 sine wave signal period time.
For being greater than the square-wave signal on 10 tunnels, it is proposed that receive the square wave of synchronizing clock signals using single-chip microcontroller, count and defeated
Multiple paths of square signals out.
(5) one stage signal synthesizes
10 road square-wave signal Y0~Y9 by 10 road sine wave signals of sensor in 10 periods for will successively be lifted
Height, to obtain square wave and sine wave synthesis 10 road signal Z0~Z9 of Hou.
(6) second signal synthesizes
The square wave and sine wave are synthesized into 10 road signal Z0~Z9 of Hou, are higher than sine wave exciting signal VinThe portion of amplitude
Divide interception to come out, obtain the 10 road signal H0~H9 of interception Hou, then closes the 10 road signal H0~H9 of interception Hou
As output signal V all the wayout, the output signal VoutWave crest S0~S9 comprising No. 10 sensors output sine wave.
(7) signal acquisition
Due to the output signal VoutWave crest S0~S9 comprising No. 10 sensors output sine wave, so as to same
On one timeline, successively from output signal VoutThe peak value of the middle multiple sensors of measurement, acquires peak value using synchronous sampling technique.
(8) signal extraction
And it marks off to come from the peak value of the peak value Zhong Jiang of acquisition No. 10 sensor output signal, the output signal all the way of acquisition
In adjacent 10 peak values respectively correspond No. 10 sensors output sine wave peak signal, therefore will it is collected all the way output letter
Number peak value is successively divided into 10 groups at equal intervals, and 10 groups of peak values are separately connected into curve, the corresponding 10 tunnels sensing of resulting 10 curves
The output signal of device.
(9) Analysis of test results
Sinusoidal crest value by analyzing 10 curves of the resulting correspondence No. 10 sensor output signal of signal extraction becomes
Change amount obtains wear particle detection number of pulses and pulse amplitude in 10 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.
As shown in figure 3, a kind of above-mentioned multichannel wear particle detection device based on time-division multiplex technology, including exciting signal source
1, sub-signal module 2, sensor module 3,10 road square wave generation modules 4, one stage signal synthesis module 5, second signal synthesize mould
Block 6, sampling clock generation module 7, signal acquisition and extraction module 8；Wherein:
The exciting signal source 1 is for generating sine wave signal Vin and synchronizing clock signals, the sine wave signal Vin
Output is connected to voltage follower module 2, and the synchronizing clock signals output is connected to 10 road square-wave signal generation modules 4, adopts
The reason of generating 10 road square-wave signal with synchronised clock is, the initial phase that exciting signal source 1 generates sine wave can be set, from
And the phase difference of adjustable sine wave exciting signal Vin and 10 road square waves.The exciting signal source 1 uses NI company PXI-
The waveform generator of the types such as 5441.
The sub-signal module 2, including a voltage follower receive the sine wave signal that signal source generates, and will excitation
The sine wave signal of signal source is divided into the identical sine wave signal in 11 tunnels, wherein 10 road sine wave signals are separately input to 10 biographies
Sensor, 1 road sine wave signal are input to sampling clock generation module 7；Voltage follower believes excitation to eliminate load variation
The influence of number source output signal, plays the role of stable input sine wave pumping signal Vin amplitude.
The sensor module 3 loads the sensor for having abrasive grain oil liquid to be detected including 10, to simplify device figure,
All the sensors circuit is not drawn in the sensor module.The sensor circuit is as shown in Fig. 4, for detecting gold
Belong to grain signal, the sensor is made of inductance capacitance parallel resonance unit and see-saw circuit, such as Fig. 4 dotted line frame institute
Show, be sensors inductance coil, inductance coil is equivalent to inductance Ls one resistance Rs of series connection, and inductance coil and capacitor Cp are formed
Antiresonant circuit.Coil inductance can be caused to change when metallic particles passes through cell winding, so as to cause resonance circuit resistance
Resistance.Antiresonant circuit impedance exports in such a way that reverse phase is amplified.The inductance coil of 10 sensors uses identical specification
Size, capacitor identical with capacitance is in parallel to form identical antiresonant circuit, guarantees 10 sensor inspections having the same
Survey sensitivity.
The 10 road square wave generation module 4, for generating 10 road square-wave signal Y0~Y9 as shown in figure 1.10 road square waves produce
Raw module 4 includes binary counter, decade counter, two-decimal decoder and phase inverter composition, the binary system
Counter makes high level continue a sine wave signal Vin period for doubling the period for inputting synchronizing clock signals；
Herein, it is exported through binary counter treated signal from Q0 pin, it according to actual needs can also be defeated from Q1~Q3 pin
Out, the period of output signal is respectively the 4 of the sine wave exciting signal Vin period, 8,16 times；10 system Counter, is used for
Input pulse is counted, and recycles four two-stage system numbers 0~9 of output, four two-stage system numbers send two-decimal decoding to
Device, for generating 10 road square-wave signals, 10 road square-wave signal features are that only one period is low level in 10 periods,
He is high level in the period, and the high level voltage is 3.3-5V, and 10 road square wave described in Fig. 1 is obtained after handling using phase inverter
Signal Y0~Y9.When square-wave signal is more than 10 tunnel, square wave generation module uses single-chip microcontroller.
The one stage signal synthesis module 5, including 10 summing circuits, for respectively by 10 road square-wave signal Y0~Y9
It is synthesized with 10 roads from the sine wave signal that sensor exports, to simplify device figure, the module 5 only depicts three and asks
And circuit.
The second signal synthesis module 6, the summing circuit including 10 diodes and a 10 road signals, diode two
Pole pipe is the detector diode with fast recovery characteristics, is used for one-way conduction, respectively will be after the square wave and sine wave synthesis
The signal of sensor output sinusoidal magnitude part passes through when passing through in 10 road signal Z0~Z9 higher than no abrasive grain, and interception is higher than nothing
The signal of sensor output sinusoidal magnitude part obtains the 10 road signal H0~H9 of interception Hou when abrasive grain passes through, and closes
Vout is exported as signal all the way.
The sampling clock generation module 7, for generating sampled clock signal, including phase-shift circuit, zero-crossing comparator.It moves
Circuitry phase is as shown in figure 5, include resistance R1, resistance R2, adjustable resistance R3, capacitor C and operational amplifier, wherein R1=R2, leads to
Adjustable resistance R3 resistance value is overregulated, the sine wave signal of input can be made to realize 0~180 ° of any angle phase shift, only needed herein
Make mobile 90 ° or so of the phase of the sine wave of input, the rising edge for the square wave for exporting sampled clock signal is made to correspond to sine wave
The peak value of pumping signal Vin, so as to so that the signal acquisition and extraction module 8 collect the peak value of sine wave；Zero passage ratio
It is used to sine wave signal being processed into square-wave signal compared with device；Make the acquisition and extraction module 8 in 10 sine wave exciting signals
The Vin period collects 10 data, and each period acquires a data.
The signal acquisition and extraction module 8 include for acquiring and extracting the peak value of the output of the signal all the way Vout
Data acquisition card, computer and signal acquisition therein and extraction procedure.The PXIe- of NI company can be used in the data acquisition card
6124 data collecting cards.The signal acquisition and extraction procedure use LABview software programming, and draw the 10 tunnels sensing of output
Device signal curve.
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 (5)
1. a kind of multichannel wear particle detection device based on time-division multiplex technology, which is characterized in that including exciting signal source, point letter
Number module, sampling clock generation module, sensor module, square wave generation module, one stage signal synthesis module, second signal synthesis
Module, signal acquisition and extraction module, in which:
The exciting signal source is used to generate sine wave exciting signal and synchronizing clock signals,
The sub-signal module receives the sine wave exciting signal that signal source generates, and the signal of exciting signal source is divided into n+1
The identical sine wave exciting signal in road, wherein the road n sine wave signal is separately input to the road n sensor, the input of 1 road sine wave signal
To sampling clock generation module；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+1 delivery outlet,
To export the road n+1 amplitude, frequency, the identical sine wave signal of phase；
The sampling clock generation module, including phase-shift circuit, zero-crossing comparator, the phase-shift circuit include 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 1 road sine wave signal that phase-shift circuit is used to receive the output of sub-signal module is 90 ° mobile；Zero-cross comparator
1 road sine wave signal is processed into square-wave signal, i.e. sampled clock signal by device, and the square wave rising edge of sampled clock signal is corresponding to be passed
The peak value of the sine wave signal of sensor output, so as to control the signal acquisition of signal acquisition module by sampled clock signal
Card collects the peak value of the output signal all the way of second signal synthesis module output；
The sensor die, block include n and load 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 sine wave signal out, each sensor include inductance capacitance antiresonant circuit and see-saw circuit；Inductance capacitance is simultaneously
Connection resonant circuit impedance is exported in a manner of reverse phase amplification；
The road n square wave generation module receives the synchronizing clock signals that exciting signal source issues, and generates the road n square wave letter with synchronised clock
Number, the road n square wave generation module includes binary counter, n system Counter, n system decoder and phase inverter, the binary system
Counter is 2 times of the sine-wave excitation signal period for increasing the period for inputting synchronizing clock signals, makes the road n square-wave signal
High level continue a sine wave exciting signal period；The n system Counter connects the output of binary counter, uses
In the square wave quantity for counting binary counter output, circulation output 0~n-1 of binary number, 0~n-1 of binary number biography
Give n system decoder, for generating the road n square-wave signal, the road n square-wave signal feature be in n period only one period be
Low level, other periods are high level, and the high level of square-wave signal is made to become low level after handling using phase inverter, and low level becomes
For high level；
The one stage signal synthesis module includes n summing circuit, for by the square-wave signal of the received road n square wave generation module
One-to-one correspondence is carried out with the sine wave signal of the road n sensor module output to synthesize；
The second signal synthesis module includes n diode and a summing circuit, and n diode respectively corresponds reception level-one
The road the n sine wave signal of the synthesis of signal synthesizing module output, n diode have one-way conduction effect, make received synthesis
The road n sine wave signal in be higher than the signal of the sinusoidal magnitude that sensor module exports when passing through without abrasive grain and pass through, interception is high
In sensor module without abrasive grain by when the signal of sinusoidal magnitude that exports obtain the interception after the road n sine wave signal,
The road the n sine wave signal after interception is synthesized into signal output all the way by summing circuit；
The signal acquisition and extraction module, for acquiring and extracting the peak value of the output of signal all the way.
2. the multichannel wear particle detection device according to claim 1 based on time-division multiplex technology, which is characterized in that described
The inductance capacitance antiresonant circuit of sensor module is made of inductance coil and capacitor, and inductance coil is equivalent to inductance series connection one
A resistance can cause inductance coil inductance to change, when the metal worn particle in oil liquid passes through cell winding so as to cause resonance
Circuit impedance variation.
3. the multichannel wear particle detection device according to claim 2 based on time-division multiplex technology, which is characterized in that described
The inductance coil of n sensor of sensor module uses identical specification, and capacitor identical with capacitance is in parallel to be formed
Identical antiresonant circuit guarantees n sensor detection sensitivity having the same.
4. the multichannel wear particle detection device according to claim 1 based on time-division multiplex technology, which is characterized in that described
The n of the road n square wave generation module is the integer of 1-10, and when n is greater than 10, square wave generation module uses single-chip microcontroller.
5. the multichannel wear particle detection device according to claim 1 based on time-division multiplex technology, which is characterized in that described
The diode of second signal synthesis module is the detector diode with fast recovery characteristics.
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| CN113484367A (en) * | 2021-07-07 | 2021-10-08 | 上海电气数智生态科技有限公司 | Circuit and method for improving measurement precision of multi-channel water quality sensor |
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| CN113484367A (en) * | 2021-07-07 | 2021-10-08 | 上海电气数智生态科技有限公司 | Circuit and method for improving measurement precision of multi-channel water quality sensor |
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