CN107607134A - A kind of absolute optical code disc decoding circuit - Google Patents
A kind of absolute optical code disc decoding circuit Download PDFInfo
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- CN107607134A CN107607134A CN201610540541.2A CN201610540541A CN107607134A CN 107607134 A CN107607134 A CN 107607134A CN 201610540541 A CN201610540541 A CN 201610540541A CN 107607134 A CN107607134 A CN 107607134A
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Abstract
A kind of absolute optical code disc decoding circuit, suitable for the communications field.Photoelectric code disk decoding circuit compares amplifying circuit, smart code differential amplifier circuit, thick code self-adapting comparative level circuit, adaptive gain amplifier control circuit by thick code and formed.Circuit reliability is high, fault diagnosis accuracy is high, adaptive ability is strong, loss of accuracy is small, the bit error rate is relatively low.
Description
Art
The present invention relates to a kind of absolute optical code disc decoding circuit, suitable for the communications field.
Background technology
Photoelectric encoder can realize the digital measurement of angle position, and control information is provided for control system.And due to its photoelectric transfer perception, compared with other sensors, with measurement accuracy height, fast response time, measurement range is wide, strong antijamming capability, small volume, functional reliability are good, non-cpntact measurement and is easy to the unrivaled advantages such as control, therefore is widely used in the every field such as the military affairs in modern times, space flight, robot industry, medical science, bioengineering.Many accurate measurements and control device, such as:Precision rotating platform, angular instrument, electro-optic theodolite, radar, ground control's instrument robot, Digit Control Machine Tool and high precision closed loop governing system are all own through turning into angular displacement sensor ideal in automatic control system as measuring cell, photoelectric code disk using photoelectric code disk.
In space industry, the space application technology such as Aerospace Satellite optic communication, space-based infrared is the space photoelectric technology that our times various countries give priority to.Wherein, accurate information capture is carried out between Aerospace Satellite, tracking turns into the key technical problems for developing these Spatial Countermeasure technologies with aiming at；In aviation field, progress high-resolution, high-precision measuring cell are required for the quick of target, accurate tracking and the tasks such as aiming in airborne fire control system, the photoelectric code disk that reliability is high, precision is very high is own through as the only selection of axis angle measurement element.With the development of Aero-Space science and technology, higher and higher requirement is proposed to optical electric axial angle encoder and its decoding system to the needs for quickly and accurately aiming at and tracking of target, people particularly in the space application technology such as Aerospace Satellite optic communication and space-based infrared.Current decoding circuit generally segments technology to improve the resolution ratio of optical electric axial angle encoder and precision using electronics, but for the influence of environment, circuit does not have adaptivity in itself, therefore, the subdivision error introduced under difficult environmental conditions influences very big on decoding circuit and control system overall precision.Simultaneously as the limitation of traditional decoding circuit structure, there is poor universality, service life is short and the major defects such as fault rate is high.
The content of the invention
The present invention provides a kind of absolute optical code disc decoding circuit, and circuit reliability is high, fault diagnosis accuracy is high, adaptive ability is strong, loss of accuracy is small, the bit error rate is relatively low.
The technical solution adopted in the present invention is：
Absolute optical code disc decoding circuit compares amplifying circuit, smart code differential amplifier circuit, thick code self-adapting comparative level circuit, adaptive gain amplifier control circuit by thick code and formed.
It is thick code primary signal is obtained output signal compared with its comparison voltage as comparator using amplifier that the thick code, which compares amplifying circuit,.If suitably choosing thick code comparison voltage, can just ensure the original trapezoidal wave signal of thick code being shaped as square-wave signal well.Thick code primary photoelectric current signal is changed into voltage signal by sampling resistor R1, and with+5V in R2, the upper partial pressures of R3 (i.e. the voltage of pin 6) compare, and if above comparison voltage, the v of thick code output voltage u=3.3, if being less than comparison voltage, thick code output is 0V.
In the smart code differential amplifier circuit, the road signals of Jing Ma tetra- are E0, E90, E180, E270, the four roads signal are the sine wave signal that phase with one another differs 90 degree, it would be desirable to are classified as two groups and do difference respectively, the purpose of adjustment amplitude size can be reached by adjusting rheostat Rll, adjustment rheostat R9/R10 can reach the purpose of adjustment signal zero-bit.Adjust the smart code subdivision's signal ESIN after amplitude and zero bias.
The thick code self-adapting comparative level circuit using after the photosignal amplification of logical circle code channel as the benchmark compared with the thick code channel photosignal in each road, when light intensity changes, logical circle code channel and thick code channel the change of photoelectric signal trend and rule are essentially identical, reference level is floated according to code channel level identical variation tendency, code channel transfer point is maintained all the time reasonably numerically, realize light intensity and compensate automatically.
The adaptive gain amplifier control circuit adds variable gain amplifier in rear class, and controls its gain by D/A outputs.During practical application, because the change of temperature is slow, therefore using the method for adjust gain by phased manner, there is provided within every ten minutes by host computer and once adjust signal, the collection of signal peak-to-peak value and processing are carried out inside processor, the gain-controlled voltage of next stage is obtained and the gain to circuit is adjusted.Although the frame hopping of very little amplitude can be produced in the moment decoding result of adjustment, normal work is will be unable to relative to system when not adjusting, angle frame hopping by a small margin is acceptable.
The beneficial effects of the invention are as follows：Circuit reliability is high, fault diagnosis accuracy is high, adaptive ability is strong, loss of accuracy is small, the bit error rate is relatively low.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
The thick code that Fig. 1 is the present invention compares amplifying circuit.
Fig. 2 is the smart code differential amplifier circuit of the present invention.
Fig. 3 is the thick code self-adapting comparative level circuit of the present invention.
Fig. 4 is the adaptive gain amplifier control circuit of the present invention.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Such as Fig. 1, it is thick code primary signal is obtained output signal compared with its comparison voltage as comparator using amplifier that thick code, which compares amplifying circuit,.If suitably choosing thick code comparison voltage, can just ensure the original trapezoidal wave signal of thick code being shaped as square-wave signal well.Thick code primary photoelectric current signal is changed into voltage signal by sampling resistor R1, and with+5V in R2, the upper partial pressures of R3 (i.e. the voltage of pin 6) compare, and if above comparison voltage, the v of thick code output voltage u=3.3, if being less than comparison voltage, thick code output is 0V.
Such as Fig. 2, in smart code differential amplifier circuit, the road signals of Jing Ma tetra- are E0, E90, E180, E270, the four roads signal is the sine wave signal that phase with one another differs 90 degree, we need to be classified as two groups to do difference respectively, can reach the purpose of adjustment amplitude size by adjusting rheostat Rll, adjustment rheostat R9/R10 can reach the purpose of adjustment signal zero-bit.Adjust the smart code subdivision's signal ESIN after amplitude and zero bias.
Such as Fig. 3, as the benchmark compared with the thick code channel photosignal in each road after slightly code self-adapting comparative level circuit amplifies the photosignal of logical circle code channel, when light intensity changes, logical circle code channel and thick code channel the change of photoelectric signal trend and rule are essentially identical, reference level is floated according to code channel level identical variation tendency, code channel transfer point is maintained all the time reasonably numerically, realize light intensity and compensate automatically.
Such as Fig. 4, adaptive gain amplifier control circuit adds variable gain amplifier in rear class, and controls its gain by D/A outputs.During practical application, because the change of temperature is slow, therefore using the method for adjust gain by phased manner, there is provided within every ten minutes by host computer and once adjust signal, the collection of signal peak-to-peak value and processing are carried out inside processor, the gain-controlled voltage of next stage is obtained and the gain to circuit is adjusted.Although the frame hopping of very little amplitude can be produced in the moment decoding result of adjustment, normal work is will be unable to relative to system when not adjusting, angle frame hopping by a small margin is acceptable.
Claims (8)
1. a kind of absolute optical code disc decoding circuit, it is characterized in that：Described absolute optical code disc decoding circuit compares amplifying circuit, smart code differential amplifier circuit, thick code self-adapting comparative level circuit, adaptive gain amplifier control circuit by thick code and formed.
2. a kind of absolute optical code disc decoding circuit according to claim 1, it is characterized in that：It is thick code primary signal is obtained output signal compared with its comparison voltage as comparator using amplifier that the thick code, which compares amplifying circuit,.
3. a kind of absolute optical code disc decoding circuit according to claim 1, it is characterized in that：In described servo amplifier circuit, Vin is the light absorbs signal amplified through prime, and R1, R2 and R4, R5 and R8, R9 determine the gain of three amplifiers respectively.
4. a kind of absolute optical code disc decoding circuit according to claim 1, it is characterized in that：Described thick code compares in amplifying circuit, thick code primary photoelectric current signal is changed into voltage signal by sampling resistor R1, with+5V in R2, the upper partial pressures of R3 (i.e. the voltage of pin 6) compare, if above comparison voltage, the v of thick code output voltage u=3.3, if be less than comparison voltage, it is 0V that thick code, which exports,.
5. a kind of absolute optical code disc decoding circuit according to claim 1, it is characterized in that：In the smart code differential amplifier circuit, the road signals of Jing Ma tetra- are E0, E90, E180, E270, and the four roads signal is the sine wave signal that phase with one another differs 90 degree.
6. a kind of absolute optical code disc decoding circuit according to claim 1, it is characterized in that：In the smart code differential amplifier circuit, the purpose of adjustment amplitude size can be reached by adjusting rheostat Rll, adjustment rheostat R9/R10 can reach the purpose of adjustment signal zero-bit.
7. a kind of absolute optical code disc decoding circuit according to claim 1, it is characterized in that：The thick code self-adapting comparative level circuit using after the photosignal amplification of logical circle code channel as the benchmark compared with the thick code channel photosignal in each road.
8. a kind of absolute optical code disc decoding circuit according to claim 1, it is characterized in that：The adaptive gain amplifier control circuit adds variable gain amplifier in rear class, and controls its gain by D/A outputs.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610540541.2A CN107607134A (en) | 2016-07-11 | 2016-07-11 | A kind of absolute optical code disc decoding circuit |
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| CN201610540541.2A CN107607134A (en) | 2016-07-11 | 2016-07-11 | A kind of absolute optical code disc decoding circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109000689A (en) * | 2018-09-25 | 2018-12-14 | 中国科学院长春光学精密机械与物理研究所 | A kind of data processing method of absolute photoelectric shaft encoder, system |
| CN115046573A (en) * | 2022-06-15 | 2022-09-13 | 中国科学院长春光学精密机械与物理研究所 | Signal processing device and method for matrix code type absolute photoelectric encoder |
-
2016
- 2016-07-11 CN CN201610540541.2A patent/CN107607134A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109000689A (en) * | 2018-09-25 | 2018-12-14 | 中国科学院长春光学精密机械与物理研究所 | A kind of data processing method of absolute photoelectric shaft encoder, system |
| CN109000689B (en) * | 2018-09-25 | 2021-05-04 | 中国科学院长春光学精密机械与物理研究所 | Data processing method and system of absolute photoelectric shaft angle encoder |
| CN115046573A (en) * | 2022-06-15 | 2022-09-13 | 中国科学院长春光学精密机械与物理研究所 | Signal processing device and method for matrix code type absolute photoelectric encoder |
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