CN112291025B - Rotating signal equal-direction synchronous triggering acquisition method based on optical fiber slip ring - Google Patents
Rotating signal equal-direction synchronous triggering acquisition method based on optical fiber slip ring Download PDFInfo
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- CN112291025B CN112291025B CN202011039906.6A CN202011039906A CN112291025B CN 112291025 B CN112291025 B CN 112291025B CN 202011039906 A CN202011039906 A CN 202011039906A CN 112291025 B CN112291025 B CN 112291025B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04J14/0201—Add-and-drop multiplexing
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Abstract
The invention discloses a rotating signal equal-direction synchronous triggering acquisition method based on an optical fiber slip ring. The rotation signal acquisition and other data acquisition systems in the invention conveniently realize the synchronous triggering of the azimuth pulse; the azimuth trigger pulse signal can be transmitted to the preposed rotating signal collector without damage; the prepositive rotary signal collector in the invention has accurate data acquisition, high capacity, high sampling rate and real-time lossless transmission. The same phase of the prepositive data acquisition signal and the local acquisition system data is ensured, so that the acquisition precision of the rotation signal is really improved.
Description
Technical Field
The invention relates to the technical field of equal-azimuth trigger acquisition of rotation signals, in particular to a synchronous equal-azimuth trigger acquisition method of rotation signals based on an optical fiber slip ring.
Background
The current common method adopted for collecting the rotation signal is to amplify the rotation signal near a signal source, transmit the signal to a ground data collection system through an electric slip ring, and use a zero orientation signal and an orientation trigger signal output by a rotary encoder assembled with a rotating shaft as external trigger signals of the data collection system, thereby completing the equal orientation collection of the rotation signal.
Due to the influence of the fluctuation of the contact resistance of the slip ring, a plurality of burrs are generated when the rotating signals are transmitted through the slip ring, so that the measurement accuracy of the rotating signals is influenced.
Another method adopted at present is to acquire a rotation signal near a signal source through a preposed data acquisition system, transmit the rotation signal to the ground through a network slip ring or wireless mode, and perform synchronous acquisition through a trigger pulse resampling mode, which is actually a super sampling mode. The defects of the method are mainly reflected in that:
1) the network slip ring is unreliable in digital signal transmission, and the transmission rate is general (within 100 Mm), so that the number of signal channels and the data sampling rate are limited;
2) the wireless acquisition has time delay, which causes defects of equal-orientation triggering real-time property and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the method for synchronously triggering and acquiring the rotating signal and other directions based on the optical fiber slip ring solves the problems of low measurement precision, limited signal channel number and data sampling rate, time delay of data instantaneity and the like.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a rotating signal equal-direction synchronous triggering acquisition method based on an optical fiber slip ring comprises the following steps:
s1, outputting a zero azimuth pulse signal and a trigger azimuth pulse signal by an encoder signal output by the rotary encoder through a frequency division counter;
s2, inputting one path of signal in the zero azimuth pulse signal and the trigger azimuth pulse signal into a ground data acquisition system, uploading the other path of signal to a rotation signal preposed data acquisition device through a first wavelength division multiplexer and an optical fiber slip ring, and decomposing a network signal, a zero azimuth pulse and a trigger azimuth pulse through a second wavelength division multiplexer;
and S3, completing channel setting of the data acquisition unit through the network signal, and triggering the preposed data acquisition unit through the zero azimuth pulse and the trigger azimuth pulse to complete equal-azimuth synchronous acquisition of the rotation signal.
Further, the method comprises the following steps: and the frequency division counter is communicated with the acquisition control computer through an RS485 protocol so as to determine the frequency division number of the rotary encoder pulse.
Further: the preposed data collector comprises a second wavelength division multiplexer, and a light-to-TTL module and a light-to-network port module which are respectively connected with the second wavelength division multiplexer, wherein multimode optical fibers output by the optical slip ring are directly accessed into the second wavelength division multiplexer and output 4 paths of optical signals with different frequency bands, wherein 2 paths of optical signals are connected to the light-to-TTL module, converted into TTL1 signals and TTL2 signals and respectively connected to an external trigger end and an external clock end on the collection controller.
Further, the method comprises the following steps: the first wavelength division multiplexer is respectively connected with the TTL light conversion module and the network port light conversion module, and the network port light conversion module is connected with a computer.
Further: the control framework of the preposed data collector is mainly realized by an FPGA chip and an ARM chip, the FPGA chip comprises a trigger control module, a rotating speed measuring module, a sampling control module, an ARM interface and a data cache module, and the ARM chip comprises a communication module and a data processing module.
Further: the zero orientation pulse is a TTL1 signal, and is controlled by a trigger module to trigger sampling; one sample of the external trigger clock is started when its rising edge is detected.
The trigger azimuth pulse is a TTL2 signal, a real-time rotating speed is obtained through a rotating speed module, the real-time rotating speed is transmitted into a sampling control module, judgment is carried out according to a set trigger threshold value 1 and a set trigger threshold value 2, and if the current rotating speed value is lower than the trigger threshold value 1, sampling is carried out by adopting a system clock; if the current rotating speed value is higher than the trigger threshold value 2 and TTL1 is a rising edge, sampling a rotating signal by using an external clock TTL2, and if the rotating speed is jumped, sampling by using an external clock TTL2 as long as the rotating speed is not lower than the trigger threshold value 1;
the sampling control module integrates a sampling clock and a real-time rotating speed which are arranged at an upper machine position, and clock pulses control the AD sampling module to work;
the AD acquisition modules of all the channels acquire data and then store the data into the cache module, the data are transmitted to the ARM module through the ARM interface, and the ARM module transmits the data to the upper computer through the network interface.
Further: and the external data of the front collector is transmitted in an optical fiber communication mode.
The invention has the beneficial effects that:
(1) the rotating signal acquisition and other ground data acquisition systems in the invention can conveniently realize the same azimuth pulse synchronous trigger acquisition;
(2) the azimuth trigger pulse signal in the invention can be transmitted to the preposed rotating signal collector without damage;
(3) the prepositive rotary signal collector in the invention has accurate data acquisition, high capacity, high sampling rate and real-time lossless transmission. The same phase of the prepositive data acquisition signal and the local acquisition system data is ensured, so that the acquisition precision of the rotation signal is really improved.
Drawings
FIG. 1 is a schematic block diagram of synchronous trigger acquisition of rotating signal azimuth pulses based on an optical fiber slip ring in the present invention;
FIG. 2 is a schematic diagram of a data communication and orientation trigger pulse connection mode based on an optical fiber slip ring according to the present invention;
FIG. 3 is a diagram of a pre-data acquisition core control architecture in accordance with the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined by the appended claims, and all changes that can be made by the invention using the inventive concept are intended to be protected.
As shown in fig. 1, a synchronous triggering and collecting method of rotating signals and other directions based on an optical fiber slip ring comprises the following steps:
s1, outputting a zero azimuth pulse signal and a trigger azimuth pulse signal by the encoder signal output by the rotary encoder through a frequency division counter;
s2, inputting one path of signal in the zero azimuth pulse signal and the trigger azimuth pulse signal into a ground data acquisition system, uploading the other path of signal to a rotation signal preposed data acquisition device through a first wavelength division multiplexer and an optical fiber slip ring, and decomposing a network signal, a zero azimuth pulse and a trigger azimuth pulse through a second wavelength division multiplexer;
and S3, completing channel setting of the data acquisition unit through the network signal, and triggering the preposed data acquisition unit through the zero azimuth pulse and the trigger azimuth pulse to complete equal-azimuth synchronous acquisition of the rotation signal.
The real-time value reading, data acquisition transmission, acquisition command issuing and the like of the sensor power supply are realized through network communication. The frequency division counter and the acquisition control computer are communicated through an RS485 protocol to determine the frequency division number of the encoder pulse.
The connection diagram of the high-speed data communication and the azimuth pulse signal of the present invention is shown in fig. 2. The +/-5V power supply of the sensor is output to the sensor after power filtering is carried out on the power supply by a DH5953I prepositive collector through a cable of an optical fiber slip ring from the ground. A four-wavelength division multiplexer (receiving), a light conversion TTL module and a light conversion network port module are arranged in the front collector of the DH 5953I. The multimode optical fiber output by the optical fiber slip ring is directly connected to a one-to-four wavelength division multiplexer (receiver) and then outputs 4 paths of optical signals with different frequency bands. Wherein, 2 paths are connected to the optical switching TTL module, and the switching TTL1 and the switching TTL2 are respectively connected to an external trigger port and an external clock port of the acquisition controller. In addition, 2 paths are connected to the optical network port conversion module, and the network port is interconnected with the network port on the communication control card, so that the high-speed communication is transmitted and received. Double-trigger synchronous acquisition of the acquisition card is realized through reasonable internal wiring.
The wavelength division multiplexing technology is actually to divide the operating wavelength of the optical fiber into a plurality of channels (channels), so as to transmit a larger amount of data in the same optical fiber. A complete wavelength division multiplexing system is divided into a wavelength division modulator (wavelength division multiplexer) at the transmitting end and a wavelength division demodulator (wavelength division multiplexer) at the receiving end, and the most commonly used element for wavelength division multiplexing is an Arrayed Waveguide Grating (AWG). At present, there are commercially available wavelength division modulator/demodulator, which can divide the optical fiber communication system into at most 80 channels, so that the data transmission rate can break through the Tb/s level at a time.
Optical fibers are commonly used for high bandwidth and long distance applications because of their advantages of low loss, high capacity, and the fact that too many repeaters are not required. Another important advantage of optical fibers is that even if several optical fibers are juxtaposed over a long distance, crosstalk (crosstalk-talk) does not occur between the optical fibers, which is contrary to transmission lines for transmitting electrical signals.
The channel 64 is synchronously acquired by the prepositive data acquisition system. In order to complete multi-channel high-speed data and other azimuth trigger synchronous acquisition, the core control architecture is shown in fig. 3. The ARM has the main functions of network communication, channel control, channel information processing and data processing.
The FPGA has the main functions:
(1) TTL1 is zero azimuth pulse, and through the trigger module, starts data acquisition of a circle of rotation signal when detecting that the pulse is a rising edge;
(2) TTL2 is a trigger azimuth pulse, real-time rotating speed is obtained through a rotating speed module, the real-time rotating speed is transmitted to a sampling control module, and judgment is carried out according to a set trigger threshold value 1 and a set trigger threshold value 2 (the threshold value 2 is larger than the threshold value 1, and the interval is larger than 30 rpm). And if the current rotating speed value is lower than the trigger threshold value 2, sampling by adopting a system clock. If the current rotating speed value exceeds a trigger threshold value 2, triggering the sampling of the rotating signals by an external clock TTL2 when TTL1 is detected to be a rising edge, and acquiring by an external clock (TTL2) if the rotating speed is jumped as long as the rotating speed is not lower than the trigger threshold value 1;
(3) the sampling control module integrates a sampling clock and a real-time rotating speed which are arranged on the upper computer, and clock pulses control the AD sampling module to work;
(4) the AD acquisition modules of all the channels acquire data and then store the data in a cache, the data are transmitted to the ARM module through the ARM interface, and the ARM transmits the data to the upper computer through the network port.
Because the external data transmission of the preposed collector adopts an optical fiber communication mode, the communication speed can reach TB/s grade, the design for limiting the system data transmission speed is mainly concentrated in the preposed annunciator, and the internal coordination communication of the preposed collector is mainly designed as follows:
1) the acquisition system control part adopts a large-scale FPGA and a System On Chip (SOC) to interact data with an upper computer in real time;
2) directly transmitting and storing the data into an upper computer server;
3) by adopting the FPGA, the system power consumption and the system cost are reduced, a large number of components are reduced, and the system performance and reliability are improved;
4) designing a back plate: the back plate mainly provides interconnection of all the acquisition channels, the rotating speed channels and the control card, and other active devices are not placed on the back plate except for the matching resistor in order to improve the maintainability of the instrument. And the high-speed clock is surrounded by copper plating around the high-speed clock line, so that the radiation interference is effectively inhibited.
The control part adopts a fifth generation high-performance large-scale FPGA and a System On Chip (SOC) of Altera company, the FPGA generates an A/D sampling clock to a bottom plate, the A/D sampling clock is distributed to each channel, real-time sampling data of each channel is read through a high-speed bus of the bottom plate, the data is interacted with an upper computer through an optical port and an optical fiber network, and the data is directly stored in the computer. All channels were collected in parallel, with a maximum sampling rate of 25.6 kHz/channel.
The application of the high-speed communication data transmission technology ensures the long-time continuous acquisition, real-time transmission and real-time storage of multi-channel high-speed data, provides technical support for the data analysis of an upper computer, ensures the accurate and real-time result of the acquired data, and avoids the problem of data asynchronization with a local acquisition system caused by data lag.
Claims (7)
1. A rotating signal equal-direction synchronous triggering acquisition method based on an optical fiber slip ring is characterized by comprising the following steps:
s1, outputting a zero azimuth pulse signal and a trigger azimuth pulse signal by an encoder signal output by the rotary encoder through a frequency division counter;
s2, inputting one signal of the zero azimuth pulse signal and the trigger azimuth pulse signal into a ground data acquisition system, uploading the other signal to a rotation signal preposed data acquisition device through a first wavelength division multiplexer and an optical fiber slip ring, and decomposing a network signal, a zero azimuth pulse and a trigger azimuth pulse through a second wavelength division multiplexer;
and S3, completing channel setting of the data acquisition unit through the network signal, and triggering the preposed data acquisition unit through the zero azimuth pulse and the trigger azimuth pulse to complete equal-azimuth synchronous acquisition of the rotation signal.
2. The method for synchronous equi-azimuth trigger acquisition of rotating signals based on the optical fiber slip ring as claimed in claim 1, wherein the frequency division counter and the acquisition control computer are communicated through RS485 protocol to determine the frequency division number of the rotary encoder pulse.
3. The method as claimed in claim 1, wherein the preposed data collector includes a second wavelength division multiplexer, and an optical to TTL module and an optical to network port module respectively connected to the second wavelength division multiplexer, and the multimode optical fiber output by the optical slipring is directly connected to the second wavelength division multiplexer and outputs 4 optical signals with different frequency bands, wherein 2 optical signals are connected to the optical to TTL module, converted into TTL1 signals and TTL2 signals, and respectively connected to an external trigger terminal and an external clock terminal of the collection controller.
4. The method for equi-azimuth synchronous trigger acquisition of rotating signals based on the optical fiber slip ring according to claim 1, wherein the first wavelength division multiplexer is respectively connected with a TTL light conversion module and a network port light conversion module, and the network port light conversion module is connected with a computer.
5. The method for synchronous trigger collection of rotating signals in equal directions based on the optical fiber slip ring as claimed in claim 1, wherein the control architecture of the preposed data collector is mainly realized by an FPGA chip and an ARM chip, the FPGA chip comprises a trigger control module, a rotating speed measuring module, a sampling control module, an ARM interface and a data cache module, and the ARM chip comprises a communication module and a data processing module.
6. The rotating signal equi-azimuth synchronous triggering acquisition method based on the optical fiber slip ring as claimed in claim 1, wherein the zero azimuth pulse is a TTL1 signal, and triggering sampling is controlled by a triggering module; starting one circle of sampling of an external trigger clock when detecting the rising edge of the external trigger clock;
the trigger azimuth pulse is a TTL2 signal, a real-time rotating speed is obtained through a rotating speed module, the real-time rotating speed is transmitted into a sampling control module, judgment is carried out according to a set trigger threshold value 1 and a set trigger threshold value 2, and if the current rotating speed value is lower than the trigger threshold value 1, sampling is carried out by adopting a clock in a front-end collector; if the current rotating speed value is higher than the trigger threshold value 2 and TTL1 is a rising edge, sampling a rotating signal by using an external clock TTL2, and if the rotating speed is jumped, sampling by using an external clock TTL2 as long as the rotating speed is not lower than the trigger threshold value 1;
the sampling control module integrates a sampling clock and a real-time rotating speed which are arranged at an upper machine position, and clock pulses control the AD sampling module to work;
the AD sampling modules of all the channels obtain data and then store the data into the cache module, the data are transmitted to the ARM module through the ARM interface, and the ARM module transmits the data to the upper computer through the network interface.
7. The rotating signal equidirectional synchronous triggering acquisition method based on the optical fiber slip ring as claimed in claim 1, wherein external data of the preposed data acquisition unit is transmitted in an optical fiber communication mode.
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