CN101551260A - Detector for interpolation errors in photoelectric encoder - Google Patents
Detector for interpolation errors in photoelectric encoder Download PDFInfo
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- CN101551260A CN101551260A CNA2009100669791A CN200910066979A CN101551260A CN 101551260 A CN101551260 A CN 101551260A CN A2009100669791 A CNA2009100669791 A CN A2009100669791A CN 200910066979 A CN200910066979 A CN 200910066979A CN 101551260 A CN101551260 A CN 101551260A
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Abstract
A detector for interpolation errors in photoelectric encoder belongs to the technical field of photoelectric detection. The detector comprises a detector casing, a data collection chip, a CPU processor and a display screen. An exterior encoder inputs two orthogonal precise code signals SIN and COS into the data collection chip. The CPU processor reads the data of data collection chip, computes the interpolation error of encoder and transmits the interpolation error of encoder to the display screen for displaying. As the speed of single-chip computer for processing data is quick, only several seconds is required for computing the interpolation error of encoder commonly. The interpolation error of encoder is directly displayed on the display screen with a data or curve form. The observation is convenient and no visual fatigue is caused. Furthermore the device is easy and light, and is easy for carrying. Whether the encoder satisfies the precision requirement can be directly determined according to the magnitude of interpolation error. The detector for interpolation errors in photoelectric encoder according to the invention is especially suitable for observing the interpolation error of encoder by non-professional people. The detection efficiency is increased for several tens of times.
Description
Technical field
The invention belongs to a kind of pick-up unit that is used to find interpolation errors in photoelectric encoder that relates in the photoelectric detection technology field.
Background technology
Optical electric axial angle encoder is present widely used representative angular displacement sensor, because the influence that is subjected to code-disc delineation, off-centre and debugs factors such as technology, when using after scrambler is debug unavoidably measuring error can appear, for high-precision optical electric axial angle encoder, subdivision error is the fundamental component of its measuring error, must carry out conscientious careful detection before using, whether satisfy accuracy requirement with the subdivision error of determining scrambler.How finding out the subdivision error of scrambler rapidly and accurately, is the problem extremely be concerned about of occurrences in human life in the industry.
Detection to the scrambler subdivision error mainly was to compare by scrambler displayed value and reference value by human eye in the past, 16 above points of a general detection of segmentation cycle of scrambler, and angle reference generally adopts autocollimator.
The prior art the most approaching with the present invention is the subdivision error pick-up unit of Changchun Institute of Optics, Fine Mechanics and Physics, CAS's development, as shown in Figure 1, comprises device case 1, shaft coupling 2, positive 24 bodies 3, turntable 4, autocollimator 5.
Scrambler and positive 24 bodies 3 link together by shaft coupling 2, be fixed on the turntable 4, autocollimator 5 also is fixed on the turntable, when scrambler rotates, the angles of display value of record coding device and the displayed value of autocollimator 5, the difference of the two promptly is the subdivision error of scrambler.Continuous coverage is 32 times in a segmentation cycle of scrambler, calculates mean square deviation, as the subdivision error of this scrambler.Because segmentation cycle of scrambler need be measured 32 points, scrambler can only rotate 1/32 of a segmentation cycle at every turn, and low-angle rotation bothers very much, overshoot easily, and autocollimator 5 and positive 24 bodies 3 install cumbersome.Therefore use this device time and effort consuming, the subdivision error of measuring scrambler under the normal condition needs about 60 minutes at least.Positive 24 bodies and autocollimator involve great expense, and efficiency of measurement is lower.
Summary of the invention
In order to overcome the defective that prior art exists, the objective of the invention is to find rapidly and accurately automatically the subdivision error of scrambler, the spy has developed a kind of pick-up unit of interpolation errors in photoelectric encoder.This apparatus structure is simple, and is with low cost, and efficient is higher.
The technical problem to be solved in the present invention provides a kind of interpolation errors in photoelectric encoder pick-up unit.The technical scheme of technical solution problem comprises device case 6, data acquisition chip 7, CPU processor 8, display screen 9 as shown in Figure 2.
That external encoder sends is the cosine and sine signal SIN and the COS of two-way quadrature.Be built-in with data acquisition chip 7, CPU processor 8, display screen 9 at device case 6,4 pin input ends of the output signal SIN of external encoder and data acquisition chip 7 link to each other, 2 pin input ends of the output signal COS of external encoder and data acquisition chip 7 link to each other, and 18 pin ground of the signal ground of external encoder and data acquisition chip 7 link to each other; 24,23,22,21,20,19,16,15,14,13,12,11,10,9,30,29,28,27,26,25 of data acquisition chip 7 links to each other with 98,97,96,95,94,93,92,91,88,87,86,85,84,83,54,53,56,55,52,51 pin of CPU processor 8 respectively; 75,74,73,72,71,70,69,68,67,66,65,62,61,60,59 pin of CPU processor 8 and 4,5,6,7,8,9,10,11,12,13,14,15,16,17,18 pin of display screen 9 link to each other.Computer software programs are contained among the inside FLASH of CPU processor 8.
External encoder is input to the smart coded signal SIN and the COS of two-way quadrature in the data acquisition chip 7, the data of CPU processor 8 reading of data acquisition chips 7, the subdivision error of calculation code device, send display screen 9 to show the subdivision error of scrambler, display screen 9 is responsible for the subdivision error of display encoder.
CPU processor adopting Keil uVision3 programming, compare according to the signal of a signal period of scrambler and the sinusoidal signal of standard, the subdivision error of calculation code device, subdivision error is presented on the display screen, display mode shows that with data mode a segmentation cycle shows the subdivision error of 16-64 segmentation position.
When scrambler is approximate when at the uniform velocity rotating, the smart coded signal of the two-way of scrambler output is a cosine and sine signal.If there is not subdivision error, its smart coded signal cosine and sine signal that is standard then, signal does not have harmonic wave; Cosine and sine signal if not standard contains harmonic component, and then there is subdivision error in scrambler.When the smart coded signal of CPU processor by data acquisition chip capturing and coding device during the cycle, this signal is carried out Fourier transform, the harmonic components of signal calculated with the cosine and sine signal comparison of standard, calculates the subdivision error of scrambler.A segmentation cycle can be calculated 16-64 point, and the data with subdivision error after calculating are presented on the OLED display screen according to this.
Good effect of the present invention:
Because the speed of single-chip microcomputer deal with data is fast, the smart coded signal data of per second processing scrambler are many, calculate the time that the scrambler subdivision error only needs several seconds under the normal condition.The subdivision error of scrambler directly is presented on the display screen with data mode, and form that also can curve shows that the people observes very convenient, can not form visual fatigue, and this device is simply light, carries easily.Can directly evaluate this scrambler according to the size of subdivision error and whether satisfy accuracy requirement, be fit to very much the subdivision error that the layman observes scrambler, improve checking efficiency greatly.
Description of drawings
Fig. 1 is the structural system block diagram of prior art.
Fig. 2 is a structural system block diagram of the present invention.
Fig. 3 is the workflow diagram of scm software in one-period among the present invention.
Fig. 4 is circuit theory diagrams of the present invention.
Embodiment
The present invention implements by structural drawing shown in Figure 2 and circuit diagram shown in Figure 4.
Wherein data acquisition chip 7 adopts 14 modulus conversion chip MAX125 of 8 passages of MAXIM company, CPU processor 8 adopts the single-chip microcomputer of the C8051F020 model of Xinhua's dragon electron production, and display screen 9 adopts the OLED display screen NHO12864-1 of Beijing Ninghe Songyang Technology Development Co., Ltd..The pick-up unit of using interpolation errors in photoelectric encoder carries out the concrete connected mode of the embodiment of subdivision error:
24 pin input/output terminals of data acquisition chip 7 and 98 pin input/output terminals of CPU processor 8 link to each other, 23 pin input/output terminals of data acquisition chip 7 and 97 pin input/output terminals of CPU processor 8 link to each other, 22 pin input/output terminals of data acquisition chip 7 and 96 pin input/output terminals of CPU processor 8 link to each other, 21 pin input/output terminals of data acquisition chip 7 and 95 pin input/output terminals of CPU processor 8 link to each other, 20 pin input/output terminals of data acquisition chip 7 and 94 pin input/output terminals of CPU processor 8 link to each other, 19 pin input/output terminals of data acquisition chip 7 and 93 pin input/output terminals of CPU processor 8 link to each other, 16 pin input/output terminals of data acquisition chip 7 and 92 pin input/output terminals of CPU processor 8 link to each other, 15 pin input/output terminals of data acquisition chip 7 and 91 pin input/output terminals of CPU processor 8 link to each other, 14 pin input/output terminals of data acquisition chip 7 and 88 pin input/output terminals of CPU processor 8 link to each other, 13 pin input/output terminals of data acquisition chip 7 and 87 pin input/output terminals of CPU processor 8 link to each other, 12 pin input/output terminals of data acquisition chip 7 and 86 pin input/output terminals of CPU processor 8 link to each other, 11 pin input/output terminals of data acquisition chip 7 and 85 pin input/output terminals of CPU processor 8 link to each other, 10 pin input/output terminals of data acquisition chip 7 and 84 pin input/output terminals of CPU processor 8 link to each other, 9 pin input/output terminals of data acquisition chip 7 and 83 pin input/output terminals of CPU processor 8 link to each other, 30 pin output terminals of data acquisition chip 7 and 54 pin input ends of CPU processor 8 link to each other, 29 pin input ends of data acquisition chip 7 and 53 pin output terminals of CPU processor 8 link to each other, 28 pin input ends of data acquisition chip 7 and 56 pin output terminals of CPU processor 8 link to each other, 27 pin input ends of data acquisition chip 7 and 55 pin output terminals of CPU processor 8 link to each other, 26 pin input ends of data acquisition chip 7 and 52 pin output terminals of CPU processor 8 link to each other, and 25 pin input ends of data acquisition chip 7 and 51 pin output terminals of CPU processor 8 link to each other; 75 pin output terminals of CPU processor 8 and 4 pin input ends of display screen 9 link to each other, 74 pin output terminals of CPU processor 8 and 5 pin input ends of display screen 9 link to each other, 73 pin output terminals of CPU processor 8 and 6 pin input ends of display screen 9 link to each other, 72 pin input/output terminals of CPU processor 8 and 7 pin input/output terminals of display screen 9 link to each other, 71 pin input/output terminals of CPU processor 8 and 8 pin input/output terminals of display screen 9 link to each other, 70 pin input/output terminals of CPU processor 8 and 9 pin input/output terminals of display screen 9 link to each other, 69 pin input/output terminals of CPU processor 8 and 10 pin input/output terminals of display screen 9 link to each other, 68 pin input/output terminals of CPU processor 8 and 11 pin input/output terminals of display screen 9 link to each other, 67 pin input/output terminals of CPU processor 8 and 12 pin input/output terminals of display screen 9 link to each other, 66 pin input/output terminals of CPU processor 8 and 13 pin input/output terminals of display screen 9 link to each other, 65 pin input/output terminals of CPU processor 8 and 14 pin input/output terminals of display screen 9 link to each other, 62 pin output terminals of CPU processor 8 and 15 pin input ends of display screen 9 link to each other, 61 pin output terminals of CPU processor 8 and 16 pin input ends of display screen 9 link to each other, 60 pin output terminals of CPU processor 8 and 17 pin input ends of display screen 9 link to each other, and 59 pin output terminals of CPU processor 8 and 18 pin input ends of display screen 9 link to each other; Computer software programs are contained among the inside FLASH of CPU processor 8.
Claims (4)
1, the pick-up unit of interpolation errors in photoelectric encoder, it is characterized in that this pick-up unit comprises device case (6), data acquisition chip (7), CPU processor (8), display screen (9), external encoder is input to the smart coded signal SIN and the COS of two-way quadrature in the data acquisition chip (7), the data of CPU processor (8) reading of data acquisition chip (7), the subdivision error of calculation code device, and send display screen (9) to show the subdivision error of scrambler;
The position of each unit and annexation:
Be built-in with data acquisition chip (7), CPU processor (8), display screen (9) at device case (6), that external encoder sends is the cosine and sine signal SIN and the COS of two-way quadrature, 4 pin input ends of the output signal SIN of external encoder and data acquisition chip (7) link to each other, 2 pin input ends of the output signal COS of external encoder and data acquisition chip (7) link to each other, and 18 pin ground of the signal ground of external encoder and data acquisition chip (7) link to each other;
24,23,22,21,20,19,16,15,14,13,12,11,10,9,30,29,28,27,26,25 of data acquisition chip 7 links to each other with 98,97,96,95,94,93,92,91,88,87,86,85,84,83,54,53,56,55,52,51 pin of CPU processor 8 respectively;
75,74,73,72,71,70,69,68,67,66,65,62,61,60,59 pin of CPU processor 8 and 4,5,6,7,8,9,10,11,12,13,14,15,16,17,18 pin of display screen 9 link to each other;
Computer software programs are contained among the inside FLASH of CPU processor 8.
2, the pick-up unit of interpolation errors in photoelectric encoder according to claim 1, it is characterized in that described data acquisition chip 7 is the chip of analog voltage signal to the digital signal conversion, wherein 4 pin are simulating signal input channel 1,2 pin are simulating signal input channel 2,18 pin are signal ground, 24,23,22,21,20,19,16,15,14,13,12,11,10,9 pin are the data pin of input and output, 30 pin are for interrupting output pin, 29 pin are the conversion and control input pin, 28 pin are the read signal input pin, 27 pin are the write signal input pin, and 26 pin are that sheet selects input pin, and 25 pin are the clock input pin.
3, the pick-up unit of interpolation errors in photoelectric encoder according to claim 1, it is characterized in that described CPU processor 8 is single-chip microcomputer, wherein 98,97,96,95,94,93,92,91,88,87,86,85,84,83,54,53,56,55,52,51,75,74,73,72,71,70,69,68,67,66,65,62,61,60,59 pin are the general digital input and output pin.
4, the pick-up unit of interpolation errors in photoelectric encoder according to claim 1, it is characterized in that described display screen 9 is dot matrix OLED display screen, wherein 4 pin are the input control signal pin, 5 pin are the input write signal, 6 pin are the input read signal, and 7,8,9,10,11,12,13,14 pin are the inputoutput data pin, and 15 pin are that sheet selects input pin, 16 pin are the input pin that resets, and 17,18 pin are the control model input pin.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009100669791A CN101551260A (en) | 2009-05-20 | 2009-05-20 | Detector for interpolation errors in photoelectric encoder |
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| CNA2009100669791A CN101551260A (en) | 2009-05-20 | 2009-05-20 | Detector for interpolation errors in photoelectric encoder |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128645A (en) * | 2010-12-13 | 2011-07-20 | 中国科学院光电技术研究所 | Dynamic angle measurement error detector used in photo-electric axial angle encoder |
| CN102944258A (en) * | 2012-11-26 | 2013-02-27 | 中国科学院长春光学精密机械与物理研究所 | Detection method for subdivision errors of optoelectronic signals of high-precision encoder |
| CN107014421A (en) * | 2017-04-19 | 2017-08-04 | 吉林宇恒光电仪器有限责任公司 | Based on two-way black and white than the uneven error detection method of photoelectric encoder code-disc |
| CN107532930A (en) * | 2015-04-29 | 2018-01-02 | 瑞尼斯豪公司 | The method for determining subdivision error |
| CN112556734A (en) * | 2020-11-30 | 2021-03-26 | 中国科学院长春光学精密机械与物理研究所 | Moire fringe subdivision method for photoelectric encoder |
| CN112697190A (en) * | 2020-12-18 | 2021-04-23 | 中国计量大学 | Dynamic calibration method for grating moire signal phase-locked subdivision errors |
| CN115752536A (en) * | 2022-09-07 | 2023-03-07 | 山东省计量科学研究院 | Method and device for detecting indexing error of photoelectric shaft-position encoder |
-
2009
- 2009-05-20 CN CNA2009100669791A patent/CN101551260A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128645A (en) * | 2010-12-13 | 2011-07-20 | 中国科学院光电技术研究所 | Dynamic angle measurement error detector used in photo-electric axial angle encoder |
| CN102944258A (en) * | 2012-11-26 | 2013-02-27 | 中国科学院长春光学精密机械与物理研究所 | Detection method for subdivision errors of optoelectronic signals of high-precision encoder |
| CN107532930A (en) * | 2015-04-29 | 2018-01-02 | 瑞尼斯豪公司 | The method for determining subdivision error |
| CN107532930B (en) * | 2015-04-29 | 2021-07-30 | 瑞尼斯豪公司 | Method for determining subdivision errors |
| CN107014421A (en) * | 2017-04-19 | 2017-08-04 | 吉林宇恒光电仪器有限责任公司 | Based on two-way black and white than the uneven error detection method of photoelectric encoder code-disc |
| CN107014421B (en) * | 2017-04-19 | 2023-04-28 | 吉林宇恒光电仪器有限责任公司 | Photoelectric encoder code disc non-uniform error detection method based on bidirectional black-white ratio |
| CN112556734A (en) * | 2020-11-30 | 2021-03-26 | 中国科学院长春光学精密机械与物理研究所 | Moire fringe subdivision method for photoelectric encoder |
| CN112556734B (en) * | 2020-11-30 | 2021-09-28 | 中国科学院长春光学精密机械与物理研究所 | Moire fringe subdivision method for photoelectric encoder |
| CN112697190A (en) * | 2020-12-18 | 2021-04-23 | 中国计量大学 | Dynamic calibration method for grating moire signal phase-locked subdivision errors |
| CN112697190B (en) * | 2020-12-18 | 2023-09-15 | 中国计量大学 | Dynamic calibration method for phase-locked subdivision error of grating moire signal |
| CN115752536A (en) * | 2022-09-07 | 2023-03-07 | 山东省计量科学研究院 | Method and device for detecting indexing error of photoelectric shaft-position encoder |
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Open date: 20091007 |