Data acquisition synchronization method of miniature ultra-high-speed data acquisition instrument

Abstract

The invention discloses a data acquisition synchronization method of a miniature ultra-high-speed data acquisition instrument. The data acquisition synchronization method comprises the following steps: S1, performing a single-module working mode; s2, performing a multi-module distributed networking mode; s3, performing a multi-module centralized networking mode; s4, performing a multi-complete machine distributed networking mode; and S5, performing a multi-complete machine distributed networking mode. According to the data acquisition synchronization method of the miniature ultra-high-speed data acquisition instrument, the synchronization mode is simple, the anti-interference capability is high, centralized and distributed data synchronous acquisition can be realized, different channels of different devices are independently synchronized, and the real-time performance and accuracy of data synchronization can be ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of data acquisition synchronization, and particularly relates to a data acquisition synchronization method for a micro ultra-high-speed data acquisition instrument. Background Art

[0002] The traditional synchronization work between high-speed data acquisition instruments adopts the method of a clock box to time multiple data acquisition instruments. It has a large volume, high cost, is inconvenient to carry, difficult to install, has limited usage environments, and requires a relatively large usage space. In an external field environment with strong vibration and impact, it is easy to cause loose connections, affecting the real-time performance and accuracy of synchronization between devices.

[0003] Therefore, in view of the above problems, further improvements are made. Summary of the Invention

[0004] The main purpose of the present invention is to provide a data acquisition synchronization method for a micro ultra-high-speed data acquisition instrument, with a simple synchronization method, strong anti-interference ability, capable of realizing centralized and distributed data synchronization acquisitions, and independent synchronization between different channels of different devices, which can ensure the real-time performance and accuracy of data synchronization.

[0005] To achieve the above object, the present invention provides a data acquisition synchronization method for a micro ultra-high-speed data acquisition instrument, including the following steps:

[0006] Step S1: Perform a single-module working mode;

[0007] Step S2: Perform a multi-module distributed networking mode;

[0008] Step S3: Perform a multi-module centralized networking mode;

[0009] Step S4: Perform a multi-whole-machine distributed networking mode;

[0010] Step S5: Perform a multi-whole-machine distributed networking mode.

[0011] As a further preferred technical solution of the above technical solution, step S1 is a synchronization method in the analog signal conditioning unit of a single micro ultra-high-speed data acquisition module:

[0012] The CVT pins of multiple AD acquisition chips in the analog signal conditioning unit of the data acquisition module are connected to the same control pin, so as to realize synchronous acquisition between multiple AD channels in a single analog signal conditioning unit.

[0013] As a further preferred technical solution of the above technical solution, step S2 is a distributed synchronization method between multiple data acquisition modules:

[0014] In the working mode of the multi-module distributed networking mode, multiple data acquisition modules distributed in various places independently acquire data and access a switch through Ethernet interfaces. The measurement and control computer obtains the acquisition data of multiple data acquisition modules through the switch;

[0015] In this mode, multiple data acquisition modules are synchronized through a synchronous clock box.

[0016] As a further preferred technical solution of the above technical solution, step S3 is a centralized synchronization method between multiple data acquisition modules:

[0017] N data acquisition modules are combined into a micro ultra-high-speed data acquisition instrument, called a single unit. The N data acquisition modules are all inserted on the motherboard. There are a total of N + 1 slots on the motherboard, into which N data acquisition modules and 1 power module are inserted respectively. The synchronization method between multiple data acquisition modules inside the single unit is as follows:

[0018] Let the data acquisition module located in the first slot on the motherboard be the main control module and output N - 1 synchronous signals CVT. The remaining data acquisition modules located in the 2nd to Nth slots are sub-modules and receive the synchronous signals from the data acquisition module in the first slot, so as to realize synchronous data acquisition between multiple data acquisition modules inside the single unit.

[0019] As a further preferred technical solution of the above technical solution, for step S4:

[0020] In the multi-unit distributed networking mode, multiple units distributed in various places independently acquire data and access a switch through Ethernet interfaces. The measurement and control computer obtains the acquisition data of multiple units through the switch;

[0021] In this mode, multiple units are synchronized through a synchronous clock box.

[0022] As a further preferred technical solution of the above technical solution, for step S5:

[0023] In the multi-unit centralized networking mode, multiple units are synchronized through CVT signal lines. Each unit can output or input CVT signals. The receiving end of the unit receives the synchronous signals from the output end of the previous unit and the output end of the unit transmits the synchronous signals to the receiving end of the next unit to realize the cascade of CVT signals.

[0024] As a further preferred technical solution of the above technical solution, in step S3, the data acquisition module located in the first slot has 1 path of CVT_in synchronous input signal and N - 1 paths of CVT_out synchronous output signals. The CVT_in synchronous input signal is output by the MCU of the data acquisition module itself, and the N - 1 paths of CVT_out synchronous output signals are respectively connected to N - 1 data acquisition modules, so as to realize synchronous data acquisition between multiple data acquisition modules inside a single whole machine.

[0025] As a further preferred technical solution of the above technical solution, in step S5, differential signals are used for long - distance transmission. The output CVT_out is converted into differential signals and output through the user interface, and the received differential CVT_in signal is converted into a single - ended signal to the MCU of the data acquisition module itself.

[0026] The beneficial effects of the present invention are as follows:

[0027] (1) High synchronization real - time performance. At a high sampling rate of 1 MHz, accurate synchronization can be achieved by using differential signal lines for transmission, and the synchronization accuracy between multiple devices is better than 10 us.

[0028] (2) Strong scalability. When multiple micro data acquisition modules or multiple micro data acquisition instruments are expanded in a centralized or distributed manner, synchronous operation of all channels can still be achieved.

[0029] (3) Strong anti - interference ability. Multiple micro data acquisition modules or multiple micro data acquisition instruments use the same control signal, but the wiring is independent. When one device fails, the remaining devices can still operate synchronously. The 6 channels of a single micro data acquisition module are also independent of each other. When one channel fails, the remaining channels can still operate synchronously.

[0030] (4) High accuracy. Between multiple micro data acquisition instruments, differential signals are used for transmission, avoiding incorrect control signals caused by environmental noise and circuit noise, so that high - accuracy control of all channels of all devices can be achieved. Description of the Drawings

[0031] Figure 1 is a schematic diagram of the single - module working mode of the present invention.

[0032] Figure 2 is a schematic diagram of the multi - module distributed networking mode of the present invention.

[0033] Figure 3 is a schematic diagram of the multi - module centralized networking mode of the present invention.

[0034] Figure 4 is a schematic diagram of the multi - module centralized networking mode of the present invention.

[0035] Figure 5 It is a schematic diagram of the multi-whole-machine distributed networking mode of the present invention.

[0036] Figure 6 It is a schematic diagram of the multi-whole-machine distributed networking mode of the present invention. Detailed implementation manners

[0037] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description of the present invention can be applied to other implementation manners, variation schemes, improvement schemes, equivalent schemes, and other technical schemes without departing from the spirit and scope of the present invention.

[0038] In the preferred embodiment of the present invention, those skilled in the art should note that the AD acquisition chips, measurement and control computers, etc. involved in the present invention can be regarded as the prior art.

[0039] Preferred embodiment.

[0040] As Figures 1-6 shown, the present invention discloses a data acquisition synchronization method for a micro ultra-high-speed data acquisition instrument, including the following steps (each step is independent and not in a superior-subordinate order relationship, and the corresponding work synchronization mode is selected according to different requirements):

[0041] Step S1: Perform the single-module working mode;

[0042] Step S2: Perform the multi-module distributed networking mode;

[0043] Step S3: Perform the multi-module centralized networking mode;

[0044] Step S4: Perform the multi-whole-machine distributed networking mode;

[0045] Step S5: Perform the multi-whole-machine distributed networking mode.

[0046] Specifically, step S1 is the synchronization method in the analog signal conditioning unit of a single micro ultra-high-speed data acquisition module (i.e., the data acquisition module, the same below):

[0047] The CVT pins of multiple AD acquisition chips (different AD acquisition chips are connected to different sensors) in the analog signal conditioning unit of the data acquisition module are connected to the same control pin, so as to realize synchronous acquisition between multiple AD channels in a single analog signal conditioning unit (as Figure 1 shown, the CVT signals of multiple AD chips come from the same control signal, and the control signal comes from the MCU of the data acquisition module, realizing precise synchronous control of multiple AD chips).

[0048] More specifically, step S2 is a distributed synchronization method among multiple data acquisition modules (each module is represented by MDS-6):

[0049] In the multi-module distributed networking mode, multiple data acquisition modules distributed in various places independently acquire data and access the switch through the Ethernet interface. The measurement and control computer obtains the acquisition data of multiple data acquisition modules through the switch;

[0050] In this mode, multiple data acquisition modules are synchronized through a synchronization clock box (the synchronization method adopts the IEEE1588v2 (PTPv2) synchronization method. For the synchronization between multiple AD chips in a single data acquisition module, see the synchronization method in step S1, as Figure 2 shown. The measurement and control computer synchronizes the clock sources of each data acquisition module through the synchronization clock box and the switch, so as to perform time synchronization when each data acquisition module acquires data).

[0051] Furthermore, step S3 is a centralized synchronization method among multiple data acquisition modules:

[0052] N data acquisition modules are combined into a micro ultra-high-speed data acquisition instrument, called a single unit (as Figure 3 shown). N data acquisition modules are all inserted on the motherboard. There are a total of N + 1 slots on the motherboard, into which N data acquisition modules and 1 power module are inserted respectively. The synchronization method among multiple data acquisition modules inside the single unit is:

[0053] Let the data acquisition module in the first slot on the motherboard be the main control module and output N - 1 synchronization signals CVT. The remaining data acquisition modules in the 2nd to Nth slots are sub-modules and receive the synchronization signals from the data acquisition module in the first slot, so as to realize synchronous data acquisition among multiple data acquisition modules inside the single unit (as Figure 4 shown. The data acquisition module as the main control module sets the acquisition instruction in advance through the measurement and control computer, so as to send the instruction to the MCU of each of the remaining data acquisition modules at the preset time point, and then perform synchronization).

[0054] Even further, for step S4:

[0055] In the multi-unit distributed networking mode, multiple units (each unit is represented by MDS-36) distributed in various places independently acquire data and access the switch through the Ethernet interface. The measurement and control computer obtains the acquisition data of multiple units through the switch (as Figure 5 shown);

[0056] In this mode, multiple complete machines are synchronized through a synchronous clock box (the synchronization method adopts the IEEE 1588v2 (PTPv2) synchronization method. The synchronous clock box synchronizes the clock sources of each complete machine. For the synchronization method between multiple modules in each complete machine, refer to the synchronization method in step S3).

[0057] Preferably, for step S5:

[0058] In the multi-complete-machine centralized networking mode, multiple complete machines are synchronized through CVT signal lines. Each complete machine can both output and input CVT signals. The receiving end of the complete machine receives the synchronization signal from the output end of the previous complete machine, and the output end of the complete machine transmits the synchronization signal to the receiving end of the next complete machine, realizing the cascading of CVT signals (as Figure 6 shown, the synchronization signal is transmitted sequentially through the motherboard).

[0059] Preferably, in step S3, the data acquisition module located in the first slot has 1 path of CVT_in synchronous input signal and N - 1 paths of CVT_out synchronous output signals. The CVT_in synchronous input signal is output by the MCU of the data acquisition module itself (relevant parameters are set in advance through the measurement and control computer). The N - 1 paths of CVT_out synchronous output signals are respectively connected to the receiving ends of N - 1 data acquisition modules, so as to realize the synchronous data acquisition between multiple data acquisition modules within a single complete machine (for the synchronization between multiple AD chips in a single data acquisition module, refer to the synchronization method in step S1).

[0060] Preferably, in step S5, (in order to avoid interference and noise caused by long-distance CVT_out and CVT_in traces), differential signals are used for long-distance transmission (a 20Mbps high-speed differential chip LTC2858-1 is used on the motherboard). The output CVT_out is converted into differential signals and output through the user interface, and the received differential CVT_in signal is converted into a single-ended signal to the MCU of the data acquisition module itself.

[0061] For the present invention, a single data acquisition module can collect data such as voltage, vibration, and strain of 6 channels (taking 6 AD acquisition chips in each module as an example). Multiple data acquisition modules can be cascaded and used distributively through Ethernet, or N data acquisition modules can be combined into an N×6-channel data acquisition instrument in a centralized manner. Multiple data acquisition instruments can still be extended through Ethernet to achieve data acquisition of hundreds or even thousands of channels. The present invention can achieve synchronous sampling between all the above channels, and the highest sampling rate can reach 1Msps. Under the condition of high sampling rate, the real-time, accuracy, and integrity of the collected and stored data can be guaranteed, which can meet the synchronous requirements of vibration, strain, temperature, voltage, etc. tests in industries such as aerospace, aviation, high-speed rail, and automobiles.

[0062] The present invention realizes the synchronous operation of a single micro ultra-high-speed data acquisition module MDS-6, multiple distributed micro ultra-high-speed data acquisition modules MDS-6, a single micro ultra-high-speed data acquisition instrument MDS-24 or MDS-36, or multiple micro ultra-high-speed data acquisition instruments MDS-24 or MDS-36. When the channels can be infinitely expanded, the accuracy and reliability of signal synchronization are ensured. It has the characteristics of high synchronous real-time performance, strong scalability, strong anti-interference and noise capabilities, and high accuracy, and can be widely applied to impact, vibration, stress, temperature, and voltage test occasions in the fields of aviation, aerospace, automobiles, high-speed rails, etc., having broad application prospects and good economic benefits.

[0063] It is worth mentioning that the technical features such as the AD acquisition chip and the measurement and control computer involved in this invention patent application should be regarded as prior art. For the specific structures, working principles, and possible control methods and spatial arrangement methods of these technical features, conventional selections in the art can be adopted, and they should not be regarded as the invention points of this invention patent, and this invention patent will not be further specifically elaborated.

[0064] For those skilled in the art, it is still possible to modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A data acquisition synchronization method for a micro ultra-high-speed data acquisition instrument, characterized in that: The following steps are involved: Step S1: Perform single module working mode; Step S2: Perform multi-module distributed networking mode; Step S3: Perform multi-module centralized networking mode; Step S4: Perform a multi-machine distributed networking mode; Step S5: Perform a multi-machine distributed networking mode.

2. The data acquisition synchronization method of a micro ultra-high-speed data acquisition instrument according to claim 1, characterized in that: Step S1 is a synchronization method within the analog signal conditioning unit of a single micro ultra-high-speed data acquisition module: The CVT pins of multiple AD acquisition chips in the analog signal conditioning unit of the data acquisition module are connected to the same control pin, thereby realizing synchronous acquisition between multiple AD channels in a single analog signal conditioning unit.

3. The data acquisition synchronization method of a micro ultra-high-speed data acquisition instrument according to claim 2, characterized in that: Step S2 is a distributed synchronization method between multiple data acquisition modules: In the multi-module distributed networking mode, multiple data acquisition modules distributed in various places collect data independently and are connected to the switch through the Ethernet interface. The measurement and control computer obtains the collected data of multiple data acquisition modules through the switch; In this mode, multiple data acquisition modules are synchronized through a synchronization clock box.

4. The data acquisition synchronization method of a micro ultra-high-speed data acquisition instrument according to claim 3, characterized in that: Step S3 is a centralized synchronization method between multiple data acquisition modules: N data acquisition modules are combined into a miniature ultra-high-speed data acquisition instrument, called a single complete machine. N data acquisition modules are inserted into the motherboard. There are N+1 slots on the motherboard, which are respectively inserted with N data acquisition modules and 1 power module. The synchronization method between multiple data acquisition modules inside the single complete machine is: The data acquisition module located in the first slot on the motherboard is made the main control module and outputs N-1 synchronization signals CVT, and the other data acquisition modules located in the second to Nth slots are sub-modules and receive the synchronization signal from the data acquisition module in the first slot, thereby realizing synchronous data acquisition between multiple data acquisition modules inside a single machine.

5. The data acquisition synchronization method of a micro ultra-high-speed data acquisition instrument according to claim 4, characterized in that: For step S4: In the multi-machine distributed networking mode, multiple machines distributed in various places collect data independently and are connected to the switch through the Ethernet interface. The measurement and control computer obtains the collected data of multiple machines through the switch; In this mode, multiple machines are synchronized through a synchronization clock box.

6. The data acquisition synchronization method of a micro ultra-high-speed data acquisition instrument according to claim 5, characterized in that: For step S5: In the multi-machine centralized networking mode, multiple machines are synchronized through the CVT signal line. Each machine can output or input CVT signals. The receiving end of the machine receives the synchronization signal from the output end of the previous machine and the output end of the machine transmits the synchronization signal to the receiving end of the next machine, realizing the cascading of CVT signals.

7. The data acquisition synchronization method of a micro ultra-high-speed data acquisition instrument according to claim 6, characterized in that: In step S3, the data acquisition module located in the first slot has 1 CVT_in synchronous input signal and N-1 CVT_out synchronous output signals. The CVT_in synchronous input signal is output by the MCU of the data acquisition module itself, and the N-1 CVT_out synchronous output signals are respectively connected to N-1 data acquisition modules, thereby realizing synchronous data acquisition between multiple data acquisition modules within a single machine.

8. The data acquisition synchronization method of a micro ultra-high-speed data acquisition instrument according to claim 7, characterized in that: In step S5, differential signals are used for long-distance transmission, the output CVT_out is converted into a differential signal and output through the user interface, and the received differential CVT_in signal is converted into a single-ended signal to the MCU of the data acquisition module itself.

Images