CN113660554A - Large-scale sensing system electric signal time division multiplexing data acquisition device and system - Google Patents
Large-scale sensing system electric signal time division multiplexing data acquisition device and system Download PDFInfo
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Abstract
The invention discloses an electric signal time division multiplexing data acquisition device and system of a large-scale sensing system, wherein the device comprises a plurality of groups of electric/optical/electric delay line modules, a channel time division switch array and a data acquisition system, wherein each group of electric/optical/electric delay line modules is connected with the channel time division switch array, and the channel time division switch array is connected with the data acquisition system; each group of electric/optical/electric delay line modules is used for receiving a group of electric signals, and performing conversion and delay processing on the electric signals to obtain a group of processed electric signals; the channel time division switch array is used for carrying out time division multiplexing on the plurality of groups of processed electric signals to the corresponding data acquisition channels; and the data acquisition system is used for acquiring and storing the electric signals subjected to time division multiplexing by the channel time division switch array. The invention can realize the time division transmission control of the electric signals of a plurality of sensors and can realize the acquisition of a plurality of synchronous sensor signals by one data acquisition channel, thereby greatly saving the requirements of an oscilloscope/a data acquisition system.
Description
Technical Field
The invention relates to the related technical fields of sensors, data acquisition, automatic control, system integration and the like, in particular to an electric signal time division multiplexing data acquisition device and system of a large-scale sensing system.
Background
In the weapon physical experiment research, in order to obtain the physical states of speed, displacement, temperature, density and the like of an experimental research physical device in the time range of shock loading microsecond to dozens of microseconds, a large number of sensors are needed to obtain the physical quantities, the physical states are converted into electric signals by the sensors, and then data are recorded by adopting a high-bandwidth (more than or equal to 500MHz) oscilloscope/data acquisition system. With the continuous improvement of the requirement of high spatial resolution in physical research, the number of sensor channels used simultaneously in one experiment can reach hundreds of channels or even hundreds of channels, and the requirement on the number of channels of the oscilloscope/data acquisition system is increased. In order to meet the electric signal acquisition requirement of a large-scale sensing system, the problems that resources are wasted, a foreign high-performance oscilloscope/data acquisition system is influenced by international trade warfare and is difficult to purchase and the like are caused by simply adopting a mode of stacking and expanding channels of the oscilloscope/data acquisition system.
Disclosure of Invention
The invention aims to solve the problems that in order to meet the electric signal acquisition requirement of a large-scale sensing system, the resource waste exists by simply adopting a channel stacking and capacity expansion mode of an oscilloscope/data acquisition system, the overseas high-performance oscilloscope/data acquisition system is influenced by international trade warfare and is difficult to purchase, and the like. The invention aims to provide an electric signal time division multiplexing data acquisition device and system of a large-scale sensing system, which can realize time division transmission control of electric signals of a plurality of sensors and acquisition of signals of a plurality of synchronous sensors by one data acquisition channel, thereby greatly saving the requirements of an oscilloscope/a data acquisition system.
The invention is realized by the following technical scheme:
in a first aspect, the invention provides a time division multiplexing data acquisition device for electric signals of a large-scale sensing system, which comprises a plurality of groups of electric/optical/electric delay line modules, a channel time division switch array and a data acquisition system, wherein each group of electric/optical/electric delay line modules is connected with the channel time division switch array, and the channel time division switch array is connected with the data acquisition system;
each group of the electric/optical/electric delay line modules is used for receiving a group of electric signals, and performing conversion and delay processing on the electric signals to obtain a group of processed electric signals;
the channel time division switch array is used for carrying out time division multiplexing on a plurality of groups of processed electric signals to the corresponding data acquisition channels;
the data acquisition system is used for acquiring and storing the electric signals subjected to time division multiplexing by the channel time division switch array;
the time division transmission control of a plurality of sensor electric signals and the acquisition of a plurality of paths of synchronous sensor signals by one path of data acquisition channel are realized by combining the electric/optical/electric delay line module, the channel time division switch array and the data acquisition system.
The working principle is as follows: aiming at the problems that in order to meet the electric signal acquisition requirement of a large-scale sensing system, resource waste exists by simply adopting a channel stacking and capacity expansion mode of an oscilloscope/data acquisition system, and a foreign high-performance oscilloscope/data acquisition system is influenced by international trade war and is difficult to purchase; the invention designs an electric signal time division multiplexing data acquisition device of a large-scale sensing system, which mainly comprises three parts: (1) an electrical/optical/electrical delay line module; (2) a channel time division switch array; (3) an oscilloscope/data acquisition system; taking 5 mus after the arrival of the trigger signal when 8 paths of electric signals are combined into 1 path of electric signals and the maximum effective time window of the sensor signal is zero as an example, the working principle is as follows: the method comprises the steps of carrying out equal difference (5 mu s) time delay on 8-path signal transmission, realizing the separation of 8-path signals on a time domain, synchronously controlling a channel switch according to a delay sequence, and only allowing effective signals to enter a data acquisition channel, so that the 8-path signals can be acquired through 1-path data acquisition channel, and the 8-path signals are arranged on the 1-path data acquisition channel in a time segmentation sequence of every 5 mu s. Signals 2-1 to 2-8 are time division multiplexed to the data acquisition channel 2, so that the signals are connected in parallel to realize a large-scale data acquisition system.
The invention can realize the time division transmission control of the electric signals of a plurality of sensors and can realize the acquisition of a plurality of synchronous sensor signals by one data acquisition channel, thereby greatly saving the requirements of an oscilloscope/a data acquisition system.
Furthermore, the channel time division switch array comprises a plurality of groups of channel time division switches and a channel time division controller, and each group of channel time division switches comprises a plurality of channel time division switches;
each group of the electric/optical/electric delay line modules receives a plurality of electric signals, the first electric signal is connected with the channel time division switches corresponding to the first electric signal one by one, each electric signal is sequentially connected with the electro-optical conversion units, the optical fiber delay lines and the photoelectric conversion units corresponding to the photoelectric conversion units one by one from the second electric signal, and the photoelectric conversion units are connected with the channel time division switches corresponding to the photoelectric conversion units; each channel time division switch is connected with the channel time division controller, and the channel time division controller is connected with the data acquisition system through a trigger channel; each channel time division switch is connected with a data acquisition system through a common group channel;
each group of multi-channel electric signal transmission is subjected to equal-difference time delay, so that multi-channel signals are separated in a time domain, channel switches are synchronously controlled according to a delay sequence, only effective signals enter a data acquisition group channel, multi-channel signals are acquired through 1 data acquisition group channel, and the multi-channel signals are distributed on the 1 data acquisition group channel in a segmentation sequence at each fixed time;
and multiple groups of electric signals are connected in parallel, and multiple groups of electric signals are time-division multiplexed to corresponding data acquisition group channels, so that a large-scale data acquisition system is realized.
Further, each group of the multiple electrical signal transmission is performed with equal-difference time delay, so as to realize the separation of multiple signals on the time domain, and the specific implementation process is as follows:
the first electrical signal has zero delay;
the second electric signal is converted into an optical signal through an electro-optical converter, the optical signal is transmitted for delay A mu s through a long-distance optical fiber delay line, and then the optical signal is recovered into the electric signal through the electro-optical converter;
the third electric signal is converted into an optical signal through an electro-optical converter, the optical signal is transmitted through an optical fiber delay line with a corresponding length for 2 xA mus, and then is recovered into the electric signal through the electro-optical converter;
and in the same way, the 1-nth signals are transmitted by the optical fiber delay line with the corresponding length for time delay (n-1) multiplied by A mu s.
Furthermore, the channel switches are synchronously controlled according to the time delay sequence, only effective signals enter the data acquisition group channels, and multi-channel signals are acquired through the 1-channel data acquisition group channels, and are distributed on the 1-channel data acquisition group channels in a segmentation sequence at each fixed time; the specific implementation process is as follows:
each group of multi-channel electric signals pass through a channel time division switch, the channel time division switch controls the on and off of a plurality of switches by a channel time division controller, and when the switches are opened, the signals of the channel are transmitted to enter a data acquisition channel;
the channel time division switch is in a normally closed state, and is triggered by a zero-time trigger signal to start working, the switch of a first electric signal is opened firstly, the duration A mu s is kept, and the switch of the first electric signal is closed; then the switch of the second electric signal is opened for a duration of A mus; in this way, the multi-channel electric signals are transmitted into the data acquisition system through the synchronous matching of time delay and switch control.
Furthermore, each path of electric signal corresponds to the corresponding switch one by one.
Further, the a μ s is determined according to the standard of the optical fiber delay line, and may be, for example, 5 μ s or 2 μ s.
Further, the data acquisition system adopts an oscilloscope.
In a second aspect, the invention also provides an explosive detonation wave control acquisition system for time division multiplexing of electric signals of a large-scale sensing system, which comprises the electric signal time division multiplexing data acquisition device of the large-scale sensing system, an electric probe test system and a detonation control system;
the electric probe testing system is connected with the time measuring sensor on the test explosive and is used for acquiring the electric signal of the time measuring sensor on the test explosive;
one end of the detonation control system is connected with a detonation point of the test explosive, and the other end of the detonation control system is connected with the time division controller through a zero-time trigger signal, and is used for controlling the delayed A mu s trigger starting action after the test explosive is detonated, so that the signal transmission synchronous control is realized.
Furthermore, the time measuring sensor adopts electric probes which are uniformly and densely arranged on the spherical surface of the test explosive and used for measuring the time when the detonation reaches the spherical surface of the test explosive.
Further, the test explosive was hemispherical and had a diameter of 200 mm.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention can greatly improve the channel utilization rate of the oscilloscope/data acquisition system in the existing large-scale electric signal sensing system. Taking an 8-channel 5-mus time division multiplexing as an example, a 384(6 × 8 × 8 ═ 384) point sensing test can be realized by 6 8-channel oscilloscopes, the channel utilization rate is improved to 8 times, and 336(384-6 × 8 ═ 336) channels of oscilloscopes/data acquisition channels are saved; by using 40 channels of 1 mus time division multiplexing, the 2 sets of 8-channel oscilloscopes can realize 640(2 multiplied by 8 multiplied by 40 is 640) channels of sensing tests, the utilization rate of the channels is improved to 40 times, and 624 channels of oscilloscopes/data acquisition channels (640-2 multiplied by 8 is 624) are saved. Thereby greatly reducing the system cost.
2. The invention can realize the time division transmission control of the electric signals of a plurality of sensors and can realize the acquisition of a plurality of synchronous sensor signals by one data acquisition channel, thereby greatly saving the requirements of an oscilloscope/a data acquisition system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of an electrical signal time division multiplexing data acquisition device of a large-scale sensing system according to the invention.
FIG. 2 is a schematic structural diagram of an explosive detonation wave control acquisition system for time division multiplexing of electric signals of a large-scale sensing system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1, the electrical signal time division multiplexing data acquisition device for a large-scale sensing system of the present invention includes a plurality of sets of electrical/optical/electrical delay line modules, a channel time division switch array and a data acquisition system, wherein each set of electrical/optical/electrical delay line modules is connected to the channel time division switch array, and the channel time division switch array is connected to the data acquisition system;
each group of the electric/optical/electric delay line modules is used for receiving a group of electric signals, and performing conversion and delay processing on the electric signals to obtain a group of processed electric signals;
the channel time division switch array is used for carrying out time division multiplexing on a plurality of groups of processed electric signals to the corresponding data acquisition channels;
the data acquisition system is used for acquiring and storing the electric signals subjected to time division multiplexing by the channel time division switch array;
the time division transmission control of a plurality of sensor electric signals and the acquisition of a plurality of paths of synchronous sensor signals by one path of data acquisition channel are realized by combining the electric/optical/electric delay line module, the channel time division switch array and the data acquisition system.
Specifically, the channel time division switch array comprises a plurality of groups of channel time division switches and a channel time division controller, wherein each group of channel time division switches comprises a plurality of channel time division switches;
each group of the electric/optical/electric delay line modules receives a plurality of electric signals, the first electric signal is connected with the channel time division switches corresponding to the first electric signal one by one, each electric signal is sequentially connected with the electro-optical conversion units, the optical fiber delay lines and the photoelectric conversion units corresponding to the photoelectric conversion units one by one from the second electric signal, and the photoelectric conversion units are connected with the channel time division switches corresponding to the photoelectric conversion units; each channel time division switch is connected with the channel time division controller, and the channel time division controller is connected with the data acquisition system through a trigger channel; each channel time division switch is connected with a data acquisition system through a common group channel;
each group of multi-channel electric signal transmission is subjected to equal-difference time delay, so that multi-channel signals are separated in a time domain, channel switches are synchronously controlled according to a delay sequence, only effective signals enter a data acquisition group channel, multi-channel signals are acquired through 1 data acquisition group channel, and the multi-channel signals are distributed on the 1 data acquisition group channel in a segmentation sequence at each fixed time;
and multiple groups of electric signals are connected in parallel, and multiple groups of electric signals are time-division multiplexed to corresponding data acquisition group channels, so that a large-scale data acquisition system is realized.
The specific working mode is as follows:
the first electrical signal has zero delay;
the second electric signal is converted into an optical signal through an electro-optical converter, the optical signal is transmitted for delay A mu s through a long-distance optical fiber delay line, and then the optical signal is recovered into the electric signal through the electro-optical converter;
the third electric signal is converted into an optical signal through an electro-optical converter, the optical signal is transmitted through an optical fiber delay line with a corresponding length for 2 xA mus, and then is recovered into the electric signal through the electro-optical converter;
and in the same way, the 1-nth signals are transmitted by the optical fiber delay line with the corresponding length for time delay (n-1) multiplied by A mu s.
Each group of multi-channel electric signals pass through a channel time division switch, the channel time division switch controls the on and off of a plurality of switches by a channel time division controller, and when the switches are opened, the signals of the channel are transmitted to enter a data acquisition channel;
the channel time division switch is in a normally closed state, and is triggered by a zero-time trigger signal to start working, the switch of a first electric signal is opened firstly, the duration A mu s is kept, and the switch of the first electric signal is closed; then the switch of the second electric signal is opened for a duration of A mus; in this way, the multi-channel electric signals are transmitted into the data acquisition system through the synchronous matching of time delay and switch control.
During specific implementation, each path of electric signal corresponds to the corresponding switch one by one, and in the processing process of each group of multi-path electric signals, only one switch is closed at the same time, and other switches are opened.
The A [ mu ] s is selected and determined according to the standard of the optical fiber delay line, for example, the A [ mu ] s can be 5 [ mu ] s or 2 [ mu ] s, and if the standard of the optical fiber delay line is selected to be 5 [ mu ] s, the transmission delay of the second electrical signal is 5 [ mu ] s, the transmission delay of the third electrical signal is 2 × 5 [ mu ] s, and so on.
The data acquisition system may be an oscilloscope or another data acquisition system, and is not limited again.
In specific implementation, taking 5 μ s after the arrival of the trigger signal when 8 paths of electric signals are combined into 1 path and the maximum effective time window of the sensor signal is zero as an example, the following description is given:
the first group of 8-path signal transmission is subjected to equal difference (5 mu s) time delay, so that 8-path signals are separated in a time domain, a channel switch is synchronously controlled according to a delay sequence, only effective signals enter a data acquisition channel, and thus the 8-path signals can be acquired through 1-path data acquisition channel, and the 8-path signals are distributed on the 1-path data acquisition channel in a time segmentation sequence of every 5 mu s. The second group of 8 paths of signals (signals 2-1 to 2-8) are time division multiplexed to the data acquisition channel 2 so as to be connected in parallel, the switch control of the corresponding serial number signal of each group of signals is controlled by the same time division control signal, and a large-scale data acquisition system is realized.
The specific working mode is as follows:
the first electrical signal has zero delay; the second electric signal 1-2 is converted into an optical signal through an electro-optical converter, the optical signal is transmitted through a long-distance optical fiber delay line for 5 microseconds of delay, and then the optical signal is recovered into the electric signal through the electro-optical converter; the third electric signal 1-3 is converted into an optical signal through an electro-optical converter, the optical signal is transmitted through an optical fiber delay line with a corresponding length for 2 multiplied by 5 mu s delay, and then is recovered into the electric signal through the electro-optical converter; and in the same way, the 1 st to nth signals are transmitted by the time delay (n-1) multiplied by 5 mu s through the optical fiber delay line with the corresponding length. Then each group of multi-channel electric signals pass through a channel time division switch, the channel time division switch controls the on and off of 8 switches by a channel time division controller, and only when the switch is opened, the signals of the channel can be transmitted to enter a data acquisition channel; the channel time division switch is in a normally closed state, and is triggered by a zero-time trigger signal to start working, the switch of the first electric signal is opened firstly, the duration time is 5 mu s, and the switch of the first electric signal is closed; then the switch of the second electric signal is opened for 5 mus; by analogy, 8 paths of electric signals are transmitted into the oscilloscope by the synchronous coordination of time delay and switch control. The oscilloscope collects and stores the data.
The invention can greatly improve the channel utilization rate of the oscilloscope/data acquisition system in the existing large-scale electric signal sensing system. Taking an 8-channel 5-mus time division multiplexing as an example, a 384(6 × 8 × 8 ═ 384) point sensing test can be realized by 6 8-channel oscilloscopes, the channel utilization rate is improved to 8 times, and 336(384-6 × 8 ═ 336) channels of oscilloscopes/data acquisition channels are saved; by using 40 channels of 1 mus time division multiplexing, the 2 sets of 8-channel oscilloscopes can realize 640(2 multiplied by 8 multiplied by 40 is 640) channels of sensing tests, the utilization rate of the channels is improved to 40 times, and 624 channels of oscilloscopes/data acquisition channels (640-2 multiplied by 8 is 624) are saved. Thereby greatly reducing the system cost.
The invention can realize the time division transmission control of the electric signals of a plurality of sensors and can realize the acquisition of a plurality of synchronous sensor signals by one data acquisition channel, thereby greatly saving the requirements of an oscilloscope/a data acquisition system.
Example 2
As shown in fig. 2, the present embodiment is different from embodiment 1 in that the present embodiment provides a large-scale sensing system electric signal time division multiplexing explosive detonation wave control and acquisition system, and the large-scale sensing system electric signal time division multiplexing explosive detonation wave control and acquisition system includes the large-scale sensing system electric signal time division multiplexing data acquisition device described in embodiment 1, and further includes an electric probe testing system and an initiation control system;
the electric probe testing system is connected with the time measuring sensor on the test explosive and is used for acquiring the electric signal of the time measuring sensor on the test explosive;
one end of the detonation control system is connected with a detonation point of the test explosive, and the other end of the detonation control system is connected with the time division controller through a zero-time trigger signal, and is used for controlling the delayed A mu s trigger starting action after the test explosive is detonated, so that the signal transmission synchronous control is realized.
In this embodiment, taking the detonation wave propagation synchronism test of the explosive as an example, a hemispherical explosive is ignited by a point, and electric probes (time measuring sensors) are uniformly and densely arranged on the spherical surface of the explosive: the diameter of the hemispherical explosive is 200mm, and 300 electric probes are uniformly distributed on the hemispherical surface and used for measuring the time when the detonation reaches the spherical surface. The time of detonator detonation and power-up is taken as a time reference, and the predicted distribution range of the arrival time of 300 electrical measurement signals is 11-13 mus. Aiming at the application, the application scheme of the explosive detonation wave control acquisition system for time division multiplexing of the electric signals of the large-scale sensing system is designed as follows: the valid time window is designed to be 2 mus, the multiplex path number is designed to be 20 paths and 1 path, and the design test system is shown in figure 2.
According to the invention, 300 measuring points are divided into 15 groups, each 20 signals are a group, 2 mus equal-difference time-division control transmission is carried out to enter 1 path of oscilloscope data acquisition channels, so that 300 paths of electrical measuring signals can be obtained through the 15 paths of data acquisition channels, wherein a channel time-division controller is triggered to start action by delaying 9 mus after the initiation of an initiation control system, and signal transmission synchronous control is realized.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The device is characterized by comprising a plurality of groups of electric/optical/electric delay line modules, a channel time division switch array and a data acquisition system, wherein each group of electric/optical/electric delay line modules is connected with the channel time division switch array, and the channel time division switch array is connected with the data acquisition system;
each group of the electric/optical/electric delay line modules is used for receiving a group of electric signals, and performing conversion and delay processing on the electric signals to obtain a group of processed electric signals;
the channel time division switch array is used for carrying out time division multiplexing on a plurality of groups of processed electric signals to the corresponding data acquisition channels;
the data acquisition system is used for acquiring and storing the electric signals subjected to time division multiplexing by the channel time division switch array;
the time division transmission control of a plurality of sensor electric signals and the acquisition of a plurality of paths of synchronous sensor signals by one path of data acquisition channel are realized by combining the electric/optical/electric delay line module, the channel time division switch array and the data acquisition system.
2. The device for time division multiplexing data acquisition of electrical signals of a large-scale sensing system according to claim 1, wherein the channel time division switch array comprises a plurality of groups of channel time division switches and a channel time division controller, each group of channel time division switches comprises a plurality of channel time division switches;
each group of the electric/optical/electric delay line modules receives a plurality of electric signals, the first electric signal is connected with the channel time division switches corresponding to the first electric signal one by one, each electric signal is sequentially connected with the electro-optical conversion units, the optical fiber delay lines and the photoelectric conversion units corresponding to the photoelectric conversion units one by one from the second electric signal, and the photoelectric conversion units are connected with the channel time division switches corresponding to the photoelectric conversion units; each channel time division switch is connected with the channel time division controller, and the channel time division controller is connected with the data acquisition system through a trigger channel; each channel time division switch is connected with a data acquisition system through a common group channel;
each group of multi-channel electric signal transmission is subjected to equal-difference time delay, so that multi-channel signals are separated in a time domain, channel switches are synchronously controlled according to a delay sequence, only effective signals enter a data acquisition group channel, multi-channel signals are acquired through 1 data acquisition group channel, and the multi-channel signals are distributed on the 1 data acquisition group channel in a segmentation sequence at each fixed time;
and multiple groups of electric signals are connected in parallel, and multiple groups of electric signals are time-division multiplexed to corresponding data acquisition group channels, so that a large-scale data acquisition system is realized.
3. The device for time division multiplexing data acquisition of electrical signals of a large-scale sensing system according to claim 2, wherein each group of the multiple electrical signal transmission is subjected to equal-difference time delay to realize the separation of multiple signals in a time domain, and the specific implementation process is as follows:
the first electrical signal has zero delay;
the second electric signal is converted into an optical signal through an electro-optical converter, the optical signal is transmitted for delay A mu s through a long-distance optical fiber delay line, and then the optical signal is recovered into the electric signal through the electro-optical converter;
the third electric signal is converted into an optical signal through an electro-optical converter, the optical signal is transmitted through an optical fiber delay line with a corresponding length for 2 xA mus, and then is recovered into the electric signal through the electro-optical converter;
and in the same way, the 1-nth signals are transmitted by the optical fiber delay line with the corresponding length for time delay (n-1) multiplied by A mu s.
4. The device for time division multiplexing data acquisition of electrical signals of a large-scale sensing system according to claim 3, wherein the channel switches are synchronously controlled according to the time delay sequence, only effective signals enter the data acquisition group channels, and acquisition of multiple channels of signals through 1 channel of the data acquisition group is realized, and the multiple channels of signals are arranged on the 1 channel of the data acquisition group in a segmented sequence at every fixed time; the specific implementation process is as follows:
each group of multi-channel electric signals pass through a channel time division switch, the channel time division switch controls the on and off of a plurality of switches by a channel time division controller, and when the switches are opened, the signals of the channel are transmitted to enter a data acquisition channel;
the channel time division switch is in a normally closed state, and is triggered by a zero-time trigger signal to start working, the switch of a first electric signal is opened firstly, the duration A mu s is kept, and the switch of the first electric signal is closed; then the switch of the second electric signal is opened for a duration of A mus; in this way, the multi-channel electric signals are transmitted into the data acquisition system through the synchronous matching of time delay and switch control.
5. The device according to claim 4, wherein each electrical signal corresponds to a corresponding switch.
6. The time division multiplexing data acquisition device for the electric signals of the large scale sensing system according to claim 3, wherein the A μ s is determined according to the standard of an optical fiber delay line.
7. The large scale sensing system electrical signal time division multiplexing data acquisition device of claim 1, wherein the data acquisition system employs an oscilloscope.
8. A large-scale sensing system electric signal time division multiplexing explosive detonation wave control acquisition system, which is characterized by comprising the large-scale sensing system electric signal time division multiplexing data acquisition device as claimed in any one of claims 1 to 7, and further comprising an electric probe test system and a detonation control system;
the electric probe testing system is connected with the time measuring sensor on the test explosive and is used for acquiring the electric signal of the time measuring sensor on the test explosive;
one end of the detonation control system is connected with a detonation point of the test explosive, and the other end of the detonation control system is connected with the time division controller through a zero-time trigger signal, and is used for controlling the delayed A mu s trigger starting action after the test explosive is detonated, so that the signal transmission synchronous control is realized.
9. The explosive detonation wave control collection system for time division multiplexing of large-scale sensing system electrical signals according to claim 8, wherein the time measurement sensor employs electric probes, the electric probes are arranged in an even array on the spherical surface of the test explosive for time measurement when detonation reaches the spherical surface of the test explosive.
10. The explosive detonation wave control and acquisition system for time division multiplexing of electrical signals of a large-scale sensing system according to claim 8, wherein the test explosive is hemispherical and has a diameter of 200 mm.
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| CN202110968334.8A CN113660554B (en) | 2021-08-23 | 2021-08-23 | Large-scale sensing system electric signal time division multiplexing data acquisition device and system |
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