CN2413301Y - Electronics subdivision device with Moore stripe - Google Patents
Electronics subdivision device with Moore stripe Download PDFInfo
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- CN2413301Y CN2413301Y CN 00202463 CN00202463U CN2413301Y CN 2413301 Y CN2413301 Y CN 2413301Y CN 00202463 CN00202463 CN 00202463 CN 00202463 U CN00202463 U CN 00202463U CN 2413301 Y CN2413301 Y CN 2413301Y
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Abstract
The utility model relates to the technical field of optoelectronics, which relates to an improvement on moire fringe signals output via a metrology grating for subdivision devices of electronics. The utility model comprises a preamplifier, a phase shifter, a multiplication frequency doubling circuit, a power amplification circuit, a sample / retainer, a multiway switch, an analogue-to-digital converter, and an SCM. The multiplier frequency multiplier circuit is combined with the software subdivision circuit of the SCM to cause the circuit to be simple with low cost. The subdivision amount of the moire fringe can be improved, and the resolution and reading precision of a detection system of the metrology grating can be improved. The utility model can improve the corrugated quality of signals after double frequency, reduce the influence of original signals to subdivision accuracy, and improve the subdivision accuracy.
Description
The utility model belongs to the optoelectronics technical field, relates to a kind of moire frange signal to metrological grating output and carries out the improvement of electronics subdividing device.
When utilizing electronics that Moire fringe is carried out the segmentation of high multiple, the normal at present device that adopts has two kinds: one, the electronics subdividing device of frequency multiplication circuit and shifting resistance chain combination.Two, scm software subdividing device.The former mainly is made up of prime amplifier 1, phase shifter 2, frequency multiplication circuit 3, power amplification circuit 4 and shifting resistance chain 5 these five parts.As shown in Figure 1, the moire frange signal frequency multiplication in frequency multiplication circuit 3 after the amplification of prime amplifier 1 difference, phase shifter 2 phase shifts can obtain the moire frange signal waveform that two frequencys multiplication 64 are segmented by 5 segmentations of shifting resistance chain again.
The shortcoming of this subdividing device is: 1, because resistance inaccurate (or not matching) has reduced the precision that Moire fringe is segmented.2, the decay of the signal amplitude after the resistance chain phase shift causes subdivision error.3, the influence of level output and input impedance had reduced subdivision accuracy before and after each resistance was subjected on the resistance chain.4, level shaping circuit in back increases with the increase of resistance chain segmentation umber, therefore makes that whole sub-circuit is numerous and jumbled, is unfavorable for improving the segmentation umber.
The scm software subdividing device is made up of prime amplifier 1, sample/hold circuit 2, analog switch 3, A/D converter 4, scm managing system 5 five parts.Its circuit as shown in Figure 2.Two-way quadrature moire frange signal after difference is amplified, by Single-chip Controlling sampling/retainer it is sampled, and respectively two paths of signals is carried out mould/number conversion by the software control multi-way switch, the digital quantity of output is given single-chip microcomputer and is handled, single-chip microcomputer is according to the amplitude of two-way quadrature moire frange signal and definite relation of phase place, calculate segmentation constant (being the segmentation value of a certain phase angle correspondence), and the output subdivision code.The single-chip microcomputer subdividing device is owing to have advantages such as reliable operation, circuit are simple, currently generally adopted by people, but makes the single-chip microcomputer segmentation figure place can not be too high owing to be subjected to the influence of the restriction of A/D conversion figure place and quantization error.In addition, the original signal poor quality also can reduce the subdivision accuracy of total system.In some occasion that need carry out high precision, high resolving power segmentation to moire frange signal, the single-chip microcomputer subdividing device still can not meet the demands like this.
The advantage of comprehensive above two kinds of subdividing devices, and reject its weak point, the electronics subdividing device that the fundamental purpose that the utility model will be realized provides a kind of Moire fringe is to solve resistance chain sub-circuit complexity, problem that precision is not high, improve the quality of original moire frange signal, obtain higher segmentation umber, and then improve the precision and the resolution of metrological grating system.
The utility model as shown in Figure 3, it comprises: prime amplifier 1, phase shifter 2, frequency multiplication circuit 3, power amplification circuit 4, sampling/retainer 5, multi-way switch 6, A/D converter 7 and scm managing system 8.Operational amplifier F1 in the prime amplifier 1, F2, the output terminal a of F3, c, e links to each other with three input ends of phase shifter 2, the phase shift output node b of phase shifter 2, the input end of multiplier X2 in d and the frequency multiplication circuit 3 is connected, operational amplifier F1 in the prime amplifier 1, the output terminal a of F2, the input end of multiplier X1 in c and the frequency multiplication circuit 3 is connected, two input ends of two output termination power amplification circuits 4 of frequency multiplication circuit 3, two output terminals of power amplification circuit 4 connect the input end of two sampling/retainers in sampling/retainer 5 respectively, the input end of the output termination multi-way switch 6 of sampling/retainer 5, the output terminal of multi-way switch 6 links to each other with the input end of A/D converter 7, and the output of A/D converter 7 links to each other with the input end of the triple gate in the scm managing system 8 at last.
Dynamic duty process of the present utility model: moire frange signal Sin θ, the Cos θ of four phase alternations ,-Sin θ ,-Cos θ, after operational amplifier F1 in prime amplifier 1, F2 difference are amplified, promptly increase amplitude, can eliminate the influence of common mode amount and even-order harmonic again.Four equal resistance R 1, R2, R3, R4 form phase shifter 2, export respectively on resistive junction by the signal Asin of phase shift π/4 (θ+π/4), Bcos (θ+π/4).Operational amplifier F3 in the prime amplifier 1 is equivalent to phase inverter, because of phase shift needs to be provided with.Frequency multiplication circuit 3 is made up of two four-quadrant analog multiplier X1, X2 and external matching circuit thereof, original signal ASin θ after it amplifies difference, signal Asin after Bcos θ and the phase shift (θ+π/4), Bcos (θ+π/4), multiply each other in twos, obtain two frequency multiplication moire frange signal Asin2 θ, the Bcos2 θ of one group of quadrature.Operational amplifier F4, F5 in the power amplification circuit is used for suppressing the common mode amount of multiplier X1, X2 output in the frequency multiplication circuit 3, and the driving power of back level sub-circuit is provided.Two-phase moire frange signal after the frequency multiplication is sent into sampling/retainer 5.Sampling pulse is sent in scm managing system 8 controls, two-way sampling/the retainer of sampling/retainer 5 is sampled simultaneously, and keep the Asin2 θ gathered, the instantaneous value of Bcos2 θ, select the output of one tunnel sampling/retainer to carry out the A/D conversion respectively by software control multi-way switch 6, just two-phase frequency-doubled signal Asin2 θ, Bcos2 θ becomes digital quantity at the instantaneous value of sampling instant and flows to scm managing system 8, scm managing system 8 is according to Asin2 θ, the positive and negative judgement quadrant of Bcos2 θ, and calculating the segmentation constant according to definite relation of its amplitude and phase place, output numerical value is the code (n is a contained segmentation umber in the Moire fringe cycle) of n segmentation.
Good effect of the present utility model: 1, the frequency multiplication circuit is combined with the single-chip microcomputer sub-circuit, formed a new electronics subdividing device, solved resistance chain sub-circuit complicated problems, made that circuit is simple, with low cost, be easy to realize.That utilizes the scm managing system segmentation makes its reliable operation, debugging conveniently a big advantage, and the electronics sub-circuit is simplified, and can not make hardware circuit become complicated because of the increase of segmentation umber.In addition, through experimental verification, only promptly can realize first overtone to the Moire fringe original signal with a slice four-quadrant analog multiplier and some resistance.If will obtain 2
nFrequency-doubled signal only can be realized with n level two frequency multiplier circuits, has also saved the space of Moire fringe electronics sub-circuit.2, the frequency multiplication circuit combines with the segmentation of scm managing system software, can improve the segmentation umber of Moire fringe greatly, improves the resolution and the reading accuracy of metrological grating detection system.Adopt the frequency multiplication circuit and 2 of N frequency multiplication
nThe scm managing system sub-circuit of segmentation just can be realized 2 of moire frange signal
N+nSegmentation, this is that in the past electronics subdividing device is incomparable.3, because the intrinsic advantage of frequency multiplication technology, solved the second-rate problem of original moire frange signal, improved the precision of back level single-chip microcomputer segmentation simultaneously, make and the utlity model has following good effect: 1. the frequency multiplication technology can reduce the influence that the non-orthogonal and amplitude of metrological grating output signal does not wait contained constant portion in these two kinds of errors, improved the quality of signal waveform after the frequency multiplication, thereby reduced the undesirable influence of original signal, improved the subdivision accuracy of total system subdivision accuracy.2. the frequency multiplication technology makes Moire fringe that subdivision error is enclosed in 1/N in the cycle, and makes that the zero crossing slope of signal waveform increases after the frequency multiplication, and this will reduce the quantization error that back level single-chip microcomputer segmentation is brought.3. when original signal is sine wave, signal after the frequency multiplication still keeps sinusoidal waveform, signal after can not making frequency multiplication because of process of frequency multiplication on the principle adds new higher hamonic wave, has relaxed the requirement to the linear circuit bandwidth significantly, can be used in the higher metrological grating pick-up unit of movement velocity.
Description of drawings of the present utility model:
Fig. 1 is prior art two frequencys multiplication 64 sub-circuit schematic diagrams
Fig. 2 is a prior art single-chip microcomputer sub-circuit schematic diagram
Fig. 3 is the circuit theory diagrams of one embodiment of the invention
Embodiment of the present utility model is as shown in Figure 3: adopt three operational amplifier OP37 that original signal is carried out difference in the prime amplifier 1 and amplify, phase shifter 2 is by four equal resistance R 1, R2, R3, R4 forms, Standard resistance range is 2-10K Ω, frequency multiplication circuit 3 is made up of two four-quadrant analog multiplier AD533, power amplification circuit 4 adopts a slice four high guaily unit integrated amplifier LM124 that the two-phase frequency-doubled signal of frequency multiplication circuit output is amplified, sampling/retainer 5 adopts AD582, multi-way switch 6 adopts AD7501, A/D converter 7 adopts eight A/D converter AD570, scm managing system 8 is by single-chip microcomputer 80C39, program storage 2764, latch 74HC373 and triple gate impact damper 74HC244 form.
Electronics sub-circuit based on 23 absolute photoelectric shaft encoders is the single-chip microcomputer sub-circuit, adopts new electronics subdividing device, at first original moire frange signal is carried out the multiplication quadruple, uses chip microcontroller software 2 again
9Segmentation just can finally realize 2
9+2=2
11Segmentation.If one week of employing, the closeest groove was 2
14Code-disc, through above-mentioned 2
11After the segmentation, optical electric axial angle encoder will have the resolution of 25 (0.04 seconds).
Claims (1)
1, a kind of electronics subdividing device of Moire fringe, it includes prime amplifier 1, phase shifter 2, frequency multiplication circuit 3, power amplification circuit 4, sampling/retainer 5, multi-way switch 6, A/D converter 7, scm managing system 8, it is characterized in that: the phase shift output node b of phase shifter 2, the input end of multiplier X2 in d and the frequency multiplication circuit 3 is connected, operational amplifier F1 in the prime amplifier 1, the output terminal a of F2, the input end of multiplier X1 in c and the frequency multiplication circuit 3 is connected, two input ends of two output termination power amplification circuits 4 of frequency multiplication circuit 3, two output terminals of power amplification circuit 4 connect the input end of two sampling/retainers in sampling/retainer 5 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00202463 CN2413301Y (en) | 2000-01-21 | 2000-01-21 | Electronics subdivision device with Moore stripe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00202463 CN2413301Y (en) | 2000-01-21 | 2000-01-21 | Electronics subdivision device with Moore stripe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2413301Y true CN2413301Y (en) | 2001-01-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00202463 Expired - Fee Related CN2413301Y (en) | 2000-01-21 | 2000-01-21 | Electronics subdivision device with Moore stripe |
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| Country | Link |
|---|---|
| CN (1) | CN2413301Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102679888A (en) * | 2012-06-01 | 2012-09-19 | 沈阳工业大学 | Moire fringe high-power subdivision method based on less spatial points and equipment |
-
2000
- 2000-01-21 CN CN 00202463 patent/CN2413301Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102679888A (en) * | 2012-06-01 | 2012-09-19 | 沈阳工业大学 | Moire fringe high-power subdivision method based on less spatial points and equipment |
| CN102679888B (en) * | 2012-06-01 | 2016-02-17 | 沈阳工业大学 | Based on Moire fringe high power divided method and the equipment of a small amount of spatial point |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |