CN204228098U - Absolute linearity displacement measuring device - Google Patents
Absolute linearity displacement measuring device Download PDFInfo
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- CN204228098U CN204228098U CN201420485729.8U CN201420485729U CN204228098U CN 204228098 U CN204228098 U CN 204228098U CN 201420485729 U CN201420485729 U CN 201420485729U CN 204228098 U CN204228098 U CN 204228098U
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Abstract
The utility model relates to displacement measuring technology field, particularly a kind of absolute linearity displacement measuring device; Comprise scale, slip read head, signal source and computing unit; Scale comprises the identical strip shaped electric poles of M bar and some signal line, M bar strip shaped electric poles is equidistantly arranged side by side, and every N number of continuous print strip shaped electric poles forms a space periodic, slip read head, for moving along M strip shaped electric poles, slip read head is provided with more than one pick-up area, pick-up area covers N number of strip shaped electric poles and also detects the pumping signal that the strip shaped electric poles that covers loads, export the signal combination detected, signal source, for generation of pumping signal, and the pumping signal that the signal wire loading frequency simultaneously given is different; The utility model avoids control signal and transmits the time delay and attenuation problem that cause, and shorter to the time in the process of signal combination, real-time is better and cost is lower.
Description
Technical field
The utility model relates to displacement measuring technology field, particularly a kind of absolute linearity displacement measuring device.
Background technology
Linear encoder is sensor straight-line displacement being converted to electric signal. contact and contactless two kinds can be divided into according to playback mode scrambler.Contact is generally not suitable for high-speed motion occasion, poor durability, so not in discussion scope.Contactless linear encoder generally comprises quiet chi and slip read head.Quiet chi has calibration information, and slip read head is generally arranged on testee, moves with testee, by comparing with the calibration information of quiet chi, and output displacement signal.
Linear displacement measurement mechanism generally includes one can provide the scale of positional information and a movable read head, detects the type of displacement according to read head, and incremental displacement measurement and absolute displacement can be divided into measure.Incremental displacement metering system is widely used in linear displacement sensing, because the advantage with low cost easily processed by the instrument of the method.Measure can only measure relative displacement due to increment type, therefore absolute reference point often will power up Startup time acquisition in measuring system, the absolute position of read head is by obtaining absolute reference point and the computing of relative displacement measured value, and this absolute reference point is generally provided by position proximity switch or optical markings.The process need finding reference point moves read head, makes it pass through and records reference point.This process is not only consuming time, and is unallowed for some application, such as elevator cage position measurement.Widely used optics and incremental magnetic induction encoder product solve this problem by increase reference channel, but are that it increases cost and the complexity of system.
For adopting the scrambler measuring electric capacity perception displacement, scale makes the electrode transmitted, measurement on read head is via capacity coupled signal, or the electrode emission signal on read head, electrode measurement on scale is via capacity coupled signal, by the deciphering of certain way, read head just can provide relative shift.Incremental displacement is measured need make uniform scale on scale, and these scales always realize with the strip shaped electric poles of evenly distributed conduction.Because the requirement of scale homogeneity, these strip shaped electric poles must be same sizes, same shape and same electric conductivity, and only in this way, the information that read head obtains just does not calculate relative shift by the impact of electrode heterogencity.Utilize same set of incremental scale electrode strip to provide absolute location information can make up the deficiency of increment type measurement, reduce the cost of absolute type measuring system simultaneously.Absolute position measurement translation read head reads a string binary code, and the problem related to has choosing, work out and reading of basic code mode.
Read this binary code generally to need to transmit from read head, be delivered on scale with signal wire, and then detect with read head the coding that electrode strip is corresponding.Because slip read head along with measured object reciprocating, so in practical application often this root signal wire need to be arranged in a kind of mechanism of similar tank chain, to prevent from colliding with barrier in motion process.Such scheme not only increases cost, and the size of mechanism increases.Particularly in the Long travel situation being greater than hundred meters, the time delay that long signal wire causes and signal attenuation all become a serious problem.
The absolute displacement code that Chinese invention patent CN200910162340.3 adopts is a kind of sequence code, it is mapped to the electrode of a string strip, therefore, electrode on scale can be regarded as a string binary code be made up of " 0 " and " 1 ", and total radical of electrode strip correspond to the total bit of binary code.When read head moves above scale, read unique binary sequence chip segment, then become absolute displacement by this sequence code segment translation, because " 0 " and " 1 " arrangement in sequence code fragment is unique.The coding of " 0 " and " 1 " make use of the difference of electrode strip electrical connection, ensures the homogeneity of electrode strip simultaneously.A string same strip shaped electric poles is distributed in the central authorities of scale substrate, and the both sides up and down of electrode arrange one group of signal wire equably, and identical signal is added to every root electrode via the signal wire of upside or downside.Therefore, every root Electrode connection depends on binary bits " 0 " represented by this root electrode or " 1 " to upside signal wire or downside signal wire, for example, it is " 0 " that definition electrode obtains signal from upside signal wire, it is " 1 " that electrode obtains signal from downside signal wire, so, a string binary code designed in advance by the upside of electrode or downside connect match on scale one by one this go here and there same strip shaped electric poles.Consider the demand of increment measurement, the requirement of compatible increment measurement is simultaneously wanted in the connection of electrode.In general, four often adjacent electrodes need be lined up a space periodic by popular increment measurement technology, and every root electrode is linked on the exciting signal source of designated phase.Because upside signal wire and downside signal wire all can provide the signal source of two groups of outs of phase, so specific coding and increment measurement can realize in same set of structure.The reading of sequence code adopts time-multiplexed method.Connection status due to read head inspecting electrode is digital quantity, so simple and reliable " excitation-detection " method is used.Particularly, pumping signal only scans sidetone signal line, only has the electrode of a phase place to be energized sometime, if some electrode has connection with the signal wire encouraged, read head just detects response, otherwise if do not had, read head does not receive signal yet.According to the presence or absence of response, read head just can judge the binary bits value that those electrodes represent.In the next moment, pumping signal is detected the electrode of next phase place, reads the bit information of those electrodes.Then, according to the time synchronized of signal scanning and read head detection information, the binary code that arrangement generation one is unique, obtains absolute displacement through tabling look-up.
Although the time-multiplexed coding reading manner that above-mentioned patent CN200910162340.3 adopts is simple, it has following problem:
1, read head must be connected with electronic scale signal wire, such guarantee read head knows where strip electrode is encouraged by the signal of which passage at current time, the corresponding encoded radio of electrode strip be connected with passage 1 is " 1 ", so corresponding with the electrode strip that passage 5 is connected encoded radio is just " 0 ", and read head judges the encoded radio of this electrode strip by the presence or absence of Received signal strength.In Long Distances, the reciprocating application of high speed, cost and the installation difficulty of signal wire increase all greatly.After signal wire is more than hundred meters, time delay, the relaxation phenomenon of signal are obvious;
2, time-multiplexed method is adopted to need extra hardware, as on-off circuit etc. controls different passage " leading to " or " breaking ".Cause the rising of installation cost like this;
3, the essence of time-multiplexed method is serial processing, length consuming time, and need the long stand-by period just can obtain required coded message, real-time is affected.
Utility model content
The utility model connects the signal wire of read head and scale in order to eliminate, and ensures that encoded radio that read head can detect counter electrode bar rapidly reduces the cost of measurement mechanism simultaneously, and a kind of absolute linearity displacement measuring device provided.
For reaching above-mentioned functions, the technical scheme that the utility model provides is:
A kind of absolute linearity displacement measuring device, comprises scale, slip read head, signal source and computing unit;
Described scale comprises the identical strip shaped electric poles of M bar and some signal line, M be more than or equal to 4 integer; Strip shaped electric poles described in M bar is equidistantly arranged side by side, and every N number of continuous print strip shaped electric poles forms a space periodic, N be more than or equal to 2 integer; Described signal wire is connected with described signal source with described strip shaped electric poles respectively;
Described slip read head, for moving along M described strip shaped electric poles, described slip read head is provided with more than one pick-up area, and described pick-up area covers N number of strip shaped electric poles and also detects the pumping signal that the strip shaped electric poles that covers loads, and exports the signal combination detected;
Described signal source, for generation of pumping signal, and the pumping signal of simultaneously giving described signal wire loading frequency different;
Described computing unit is connected with described slip read head, receives signal combination that described slip read head detects and to go forward side by side row relax.
Preferably, the quantity of described signal wire is 2N bar, and be divided into the first group of signal wire and second group of signal wire of often organizing N bar, described first group of signal wire and described second group of signal wire lay respectively at above and below described strip shaped electric poles, and each signal line in each group signal wire sorts successively.
Preferably, in each space periodic, the strip shaped electric poles of identical sequence is connected on signal wire corresponding with this sequence in described first group of signal wire or described second group of signal wire.
Preferably, described computing unit comprises code translator and sorting unit, described code translator is for the spectrum signature that parses described signal combination and comprise and be translated as binary code, and being supplied to described sorting unit, described sorting unit calculates scale-of-two basic code according to this binary code and finds the absolute position corresponding to described scale-of-two basic code.
The beneficial effects of the utility model are: compared with prior art, and the utility model has following advantage:
1, by loading the pumping signal of different frequency to different signal wires, the signal that slip read head reads on strip shaped electric poles obtains a signal combination, then adopts the method for spectrum analysis to resolve, and draws the encoded radio of strip shaped electric poles; Owing to not needing Time-sharing control multi channel signals, therefore slip read head with do not need between scale to be connected by signal wire, thus avoid channel control signals and transmit the time delay and attenuation problem that cause;
2, the utility model adopts the method for spectrum analysis to be equivalent to parallel processing, and prior art adopts time-multiplexed method to be serial processing in essence, and therefore the utility model is shorter to the time in the process of signal combination, and real-time is better;
3, slip read head of the present utility model with do not need between scale to be connected with signal wire, therefore provide cost savings, long-term reciprocating signal wire often requires high flexibility, long-fatigue life, expensive, in the application that some strokes are long (as elevator), the cost of signal wire is just very important.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation that slip read head has two pick-up area.
Embodiment
Be further elaborated below in conjunction with accompanying drawing 1 and accompanying drawing 2 pairs of the utility model:
A kind of absolute linearity displacement measuring device as shown in Figure 1, comprises scale 1, slip read head 2, signal source 3 and computing unit 4, there is air gap and face scale 1 to move between slip read head 2 and scale 1.
Scale 1 comprise the identical strip shaped electric poles of M bar 11 and some signal line 12, M be more than or equal to 4 integer; M bar strip shaped electric poles 11 is equidistantly arranged side by side, and every N number of continuous print strip shaped electric poles 11 forms a space periodic, N be more than or equal to 2 integer; Signal wire 12 is connected with signal source 3 with strip shaped electric poles 11 respectively.
Slip read head 2, for moving along M strip shaped electric poles 11, slip read head 2 is provided with more than one pick-up area 21, pick-up area 21 covers N number of strip shaped electric poles 11 and also detects the pumping signal that the strip shaped electric poles 11 that covers loads, and exports the signal combination detected.
Signal source 3, for generation of pumping signal, and the pumping signal that signal wire 12 loading frequency simultaneously given is different.
Computing unit 4 is connected with slip read head 2, receives signal combination that slip read head 2 detects and to go forward side by side row relax.
Computing unit 4 comprises code translator 41 and sorting unit 42, code translator 41 is for the spectrum signature that parses signal combination and comprise and be translated as binary code, and being supplied to described sorting unit 42, sorting unit 42 calculates scale-of-two basic code according to this binary code and finds the absolute position corresponding to scale-of-two basic code.
In addition, in order to make absolute linearity displacement measuring device of the present utility model, the arrangement more bout reason of signal wire 12, more easily connect, the quantity of signal wire 12 can adopt 2N bar, and being divided into the first group of signal wire and second group of signal wire of often organizing N bar, first group of signal wire and second group of signal wire lay respectively at above and below strip shaped electric poles 11, and each signal line 12 in each group signal wire sorts successively.The strip shaped electric poles 11 of identical sequence in each space periodic is connected on signal wire 12 corresponding with this sequence in first group of signal wire or second group of signal wire.
Below for N for 4, be namely a space periodic for 4 strip shaped electric poles 11, the utility model be described in detail.
A string identical conduction strip shaped electric poles 11 is imprinted on the central authorities of scale 1, electrode fill area and non-electrode fill area equalization.Eight signal wires 12 are also imprinted on scale 1, and half is positioned at the upside of strip shaped electric poles 11, and second half is positioned at the downside of strip shaped electric poles 11.The strip shaped electric poles 11 of every four next-door neighbours constitutes a space periodic, the strip shaped electric poles 11 of the same position in any space periodic must be corresponding with upside or downside signal wire 12 be connected, first strip shaped electric poles 11 in such as space periodic is connected with the signal wire 12 (upside or downside) near electrode, for sake of convenience, be defined as A phase electrode, second strip shaped electric poles 11 in space periodic is connected with time signal wire 12 (upside or downside) of close strip shaped electric poles 11, be defined as B phase electrode, by that analogy, last root electrode strip in space periodic is connected with the signal wire 12 (upside or downside) of distalmost end, be defined as D phase electrode, strip shaped electric poles 11 selects the signal wire 12 connecting side or downside to be determined by " 0 " or " 1 " of basic code.
Slip read head 2 comprises the rectangular pick-up area 21 of 1 electrical isolation.Pick-up area 21 is conductions, is around non-conductive.Each pick-up area 21 covers a space periodic be made up of 4 strip shaped electric poles 11.Each pick-up area 21 have one independently output line the signal received is sent to code translator 41 and sorting unit 42.Therefore, an electrode strip being series-connected to upside signal wire 12 or downside signal wire 12 represents unique absolute position, and the method based on " excitation-detection " can read this string basic code.
The periodic signal that signal source 3 produces one group of different frequency is loaded into corresponding signal wire 12 respectively.As shown in fig. 1, eight signal line 12 load respectively the pumping signal of eight kinds of different frequencies, excitation can be the cyclical signals such as sine wave, square wave, triangular wave, frequency counts f1, f2, f3, f4, f5, f6, f7, f8 respectively, and corresponding pumping signal can be expressed as: C (f1), C (f2), C (f3), C (f4), C (f5), C (f6), C (f7), C (f8).
Slip read head 2 collects strip shaped electric poles 11 and combines the combination that the signal S being coupled is this group signal, can be expressed as:
Wherein ki represents eight signal line 12 and the annexation of corresponding strip shaped electric poles 11, as k=1, represents that signal wire 12 is connected with strip shaped electric poles 11, represents that signal wire 12 is not connected with electrode strip as k=0.
Code translator 41, to the signal combination S process collected, parses the spectrum signature that it comprises, and in prior art, has multiple method can realize this function, and popular method is discrete Fourier transformation method DFT or Fast Fourier Transform (FFT) FFT.After code translator 41 obtains the spectrum signature of composite signal S, then by the frequency content analysis that wherein comprises and the encoded radio of corresponding strip shaped electric poles 11, following form can be utilized to judge.
If the signal that slip read head 2 reads comprises f1, f6, f7, f8 tetra-kinds of frequency components, through tabling look-up, be judged as state 1, namely the encoded radio of ABCD tetra-electrodes is " 1000 "; If the signal read comprises f1, f2, f3, f4 tetra-kinds of frequency components, through tabling look-up, be judged as state 4, namely the encoded radio of ABCD tetra-electrode strips is " 1111 ".
If it is longer to need to recognize location length, need more strip shaped electric poles 11 to be resolved, can design multiple pick-up area 21 be arranged in order in slip read head 2, many pick-up area 21 just can increase by one group of 4 bit code.Multiple pick-up area 21 order reads, as shown in Figure 2, first pick-up area 21 obtains a group code for " 1011 ", and second pick-up area 21 obtains a group code for " 0101 ", sorting unit 42 calculates basic code for " 10110101 ", finally tables look-up and finds out absolute position corresponding to this basic code.
The above embodiment, just preferred embodiments of the present utility model, be not limit practical range of the present utility model, therefore all equivalences done according to structure, feature and the principle described in the utility model claim change or modify, and all should be included in the utility model patent claim.
Claims (3)
1. an absolute linearity displacement measuring device, is characterized in that: comprise scale, slip read head, signal source and computing unit;
Described scale comprises the identical strip shaped electric poles of M bar and some signal line, M be more than or equal to 4 integer; Strip shaped electric poles described in M bar is equidistantly arranged side by side, and every N number of continuous print strip shaped electric poles forms a space periodic, N be more than or equal to 2 integer; Described signal wire is connected with described signal source with described strip shaped electric poles respectively;
Described slip read head, for moving along M described strip shaped electric poles, described slip read head is provided with more than one pick-up area, and described pick-up area covers N number of strip shaped electric poles and also detects the pumping signal that the strip shaped electric poles that covers loads, and exports the signal combination detected;
Described signal source, for generation of pumping signal, and the pumping signal of simultaneously giving described signal wire loading frequency different, pumping signal is cyclical signal;
Described computing unit is connected with described slip read head, receives signal combination that described slip read head detects and to go forward side by side row relax; Described computing unit comprises code translator and sorting unit, described code translator is for the spectrum signature that parses described signal combination and comprise and be translated as binary code, and being supplied to described sorting unit, described sorting unit calculates scale-of-two basic code according to this binary code and finds the absolute position corresponding to described scale-of-two basic code.
2. absolute linearity displacement measuring device as claimed in claim 1, it is characterized in that: the quantity of described signal wire is 2N bar, and be divided into the first group of signal wire and second group of signal wire of often organizing N bar, described first group of signal wire and described second group of signal wire lay respectively at above and below described strip shaped electric poles, and each signal line in each group signal wire sorts successively.
3. absolute linearity displacement measuring device as claimed in claim 2, is characterized in that: in each space periodic, the strip shaped electric poles of identical sequence is connected on signal wire corresponding with this sequence in described first group of signal wire or described second group of signal wire.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104236437A (en) * | 2014-08-26 | 2014-12-24 | 广东盈动高科自动化有限公司 | Absolute linear displacement measurement device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104236437A (en) * | 2014-08-26 | 2014-12-24 | 广东盈动高科自动化有限公司 | Absolute linear displacement measurement device |
| CN104236437B (en) * | 2014-08-26 | 2017-09-29 | 广东盈动高科自动化有限公司 | Absolute linearity displacement measuring device |
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