CN112636721B - Variable-interval laser narrow pulse combined capturing system and method - Google Patents
Variable-interval laser narrow pulse combined capturing system and method Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/02—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components
- H03K19/14—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
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Abstract
The invention belongs to the technical field of photoelectric testing, and particularly relates to a variable-interval laser narrow pulse combined capturing system and method. The invention has the characteristics of configurable trigger parameters, settable sampling rate and high sampling rate, is suitable for capturing narrow pulse signals which cannot be predicted and mastered in the transmission rule, and mainly solves the problems of capturing and collecting narrow pulses of variable-interval laser. The technology adopts a high-speed data acquisition module with a high-sensitivity trigger to form a laser pulse acquisition system. The invention captures the laser narrow pulse by adopting the high-sensitivity trigger which has the combined triggering function of pulse width and amplitude, and reasonably configures the high-sensitivity trigger according to the characteristic parameters of the laser narrow pulse, so that the laser narrow pulse signal can be effectively captured, thereby ensuring that a high-speed data acquisition module can acquire effective laser pulse waveform data and ensuring the reliability of a laser pulse acquisition system.
Description
Technical Field
The invention belongs to the technical field of photoelectric testing, and particularly relates to a variable-interval laser narrow pulse combined capturing system and method.
Background
With the development of laser technology, laser detection and laser guidance are widely applied to military. The coding and energy of the laser irradiation light source are important characteristic parameters of the laser information field, and are important bases for evaluating the application effect of the laser irradiation light source. The laser code output by the laser irradiation light source has fixed frequency, and the arrival time of the laser pulse can be predicted according to the laser repetition frequency parameter only by capturing the laser pulse signal once. However, the variable-interval laser coding cannot predict the arrival time of the laser pulse, so that an effective signal capturing method is necessary to be designed for the variable-interval laser narrow-pulse acquisition system, thereby ensuring that an effective signal part of the laser narrow-pulse is acquired and avoiding that an ineffective clutter signal occupies precious cache resources of the data acquisition system.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problems that: how to provide an effective triggering scheme, the variable-interval laser narrow pulse signals can be rapidly and effectively captured, so that the effective signal part of the laser narrow pulse is ensured to be collected.
(II) technical scheme
In order to solve the technical problem, the invention provides a variable-interval laser narrow pulse combined capturing system, which comprises: combining a trigger and a high-speed data acquisition module;
the combined trigger is provided with two trigger modules, namely a pulse width trigger module and an amplitude trigger module, wherein the pulse width trigger module is used for outputting a pulse width trigger signal when a pulse with a set pulse width range is captured in the signal; the amplitude triggering module is used for outputting an amplitude triggering signal when the signal is captured in the signal and exceeds the set voltage amplitude; and the pulse width trigger signal and the amplitude trigger signal pass through a logic AND circuit, and output a final trigger signal to control the high-speed data acquisition module to complete acquisition and storage operation of the laser narrow pulse.
The pulse width triggering module is used for setting an effective triggering pulse width range according to pulse width characteristic parameters of the laser narrow pulse, and outputting a pulse width triggering signal when capturing the pulse in the set effective triggering pulse width range in the signal, so as to filter clutter signals with over-limited pulse width.
The minimum value of the triggering pulse width of the pulse width triggering module is 10ns, and the maximum value of the triggering pulse width of the pulse width triggering module is 1 mu s.
The amplitude triggering module is used for setting an effective amplitude triggering level according to the voltage amplitude characteristic parameter of the laser narrow pulse, and outputting an amplitude triggering signal when capturing the voltage amplitude of the signal exceeding the set effective amplitude triggering level in the signal, so as to filter clutter signals with small amplitude.
Wherein the effective amplitude trigger level is 0.1V at the minimum and is the upper limit of the digital acquisition module at the maximum.
The pulse width trigger signal output by the pulse width trigger module and the amplitude trigger signal output by the amplitude trigger module output final trigger signals after logical AND, so that the situation that a single trigger is easy to trigger by mistake is avoided, and the effective signal part of the laser narrow pulse is ensured to be collected.
In addition, the invention also provides a variable-interval laser narrow pulse combined capturing method, which is implemented based on the variable-interval laser narrow pulse combined capturing system and comprises the following steps of:
step 1: the pulse width triggering module outputs a pulse width triggering signal when capturing a pulse with a set pulse width range in the signal;
step 2: the amplitude triggering module outputs an amplitude triggering signal when capturing a signal exceeding the set voltage amplitude in the signal;
step 3: and the pulse width trigger signal and the amplitude trigger signal pass through a logic AND circuit, and output a final trigger signal to control the high-speed data acquisition module to complete acquisition and storage operation of the laser narrow pulse.
In the step 1, the pulse width triggering module sets an effective triggering pulse width range according to pulse width characteristic parameters of the laser narrow pulse, and the pulse width triggering module outputs a pulse width triggering signal when capturing the pulse in the set effective triggering pulse width range in the signal, so as to filter clutter signals with over-limited pulse width; the minimum value of the triggering pulse width of the pulse width triggering module is 10ns, and the maximum value is 1 mu s.
In the step 2, the amplitude triggering module sets an effective amplitude triggering level according to the voltage amplitude characteristic parameter of the laser narrow pulse, and when the amplitude triggering module captures the voltage amplitude of the signal exceeding the set effective amplitude triggering level in the signal, the amplitude triggering module outputs an amplitude triggering signal, so as to filter clutter signals with small amplitude; the effective amplitude triggering level is 0.1V at the minimum and is the upper limit of the digital acquisition module at the maximum.
In the step 3, the pulse width trigger signal output by the pulse width trigger module and the amplitude trigger signal output by the amplitude trigger module output final trigger signals after logical AND, so that a single trigger is prevented from being easily triggered by mistake, and the effective signal part of the laser narrow pulse is ensured to be collected.
(III) beneficial effects
Compared with the prior art, the invention provides a high-speed data acquisition module based on a pulse width and amplitude combined trigger, which is used for capturing the variable-interval laser narrow pulse signals, can effectively improve the capturing probability of the variable-interval narrow pulse signals, is also suitable for the laser pulse signals with fixed intervals, and provides a more effective method for acquiring the laser signals.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a diagram illustrating a data acquisition software interface according to the present invention.
Fig. 3 and 4 are schematic diagrams of pulse signals in the implementation process of the scheme of the present invention.
Detailed Description
For the purposes of clarity, content, and advantages of the present invention, a detailed description of the embodiments of the present invention will be described in detail below with reference to the drawings and examples.
In order to effectively capture the variable-interval laser narrow pulse signals, a trigger is required to analyze signal characteristics, and when the signal characteristics are judged to be in accordance with the laser narrow pulse characteristics, the trigger generates trigger signals to control the high-speed data acquisition module to acquire and store data. When the laser narrow pulse signal is converted into an electric pulse signal by the laser detector, clutter is easily generated due to the influence of interference signals in the environment, and the acquisition system is triggered by errors to acquire invalid data. The high-sensitivity trigger has a pulse width and amplitude combined triggering function, and can effectively capture laser narrow pulse signals by reasonably configuring the trigger according to two characteristic parameters of the pulse width and the amplitude of the laser narrow pulse, so that the high-speed data acquisition module is ensured to be capable of acquiring effective laser pulse waveform data, and the reliability of a laser pulse acquisition system is ensured.
To solve the problems in the prior art, the present invention provides a variable-interval laser narrow-pulse combined capturing system, as shown in fig. 1, including: a high-sensitivity combined trigger and a high-speed data acquisition module;
the combined trigger is provided with two trigger modules, namely a pulse width trigger module and an amplitude trigger module, wherein the pulse width trigger module is used for outputting a pulse width trigger signal when a pulse with a set pulse width range is captured in the signal; the amplitude triggering module is used for outputting an amplitude triggering signal when the signal is captured in the signal and exceeds the set voltage amplitude; and the pulse width trigger signal and the amplitude trigger signal pass through a logic AND circuit, and output a final trigger signal to control the high-speed data acquisition module to complete acquisition and storage operation of the laser narrow pulse.
The pulse width triggering module is used for setting an effective triggering pulse width range according to pulse width characteristic parameters of the laser narrow pulse, and outputting a pulse width triggering signal when capturing the pulse in the set effective triggering pulse width range in the signal, so as to filter clutter signals with over-limited pulse width.
The minimum value of the triggering pulse width of the pulse width triggering module is 10ns, and the maximum value of the triggering pulse width of the pulse width triggering module is 1 mu s.
The amplitude triggering module is used for setting an effective amplitude triggering level according to the voltage amplitude characteristic parameter of the laser narrow pulse, and outputting an amplitude triggering signal when capturing the voltage amplitude of the signal exceeding the set effective amplitude triggering level in the signal, so as to filter clutter signals with small amplitude.
Wherein the effective amplitude trigger level is 0.1V at the minimum and is the upper limit of the digital acquisition module at the maximum.
The pulse width trigger signal output by the pulse width trigger module and the amplitude trigger signal output by the amplitude trigger module output final trigger signals after logical AND, so that the situation that a single trigger is easy to trigger by mistake is avoided, and the effective signal part of the laser narrow pulse is ensured to be collected.
In addition, the invention also provides a variable-interval laser narrow pulse combined capturing method, which is implemented based on the variable-interval laser narrow pulse combined capturing system and comprises the following steps of:
step 1: the pulse width triggering module outputs a pulse width triggering signal when capturing a pulse with a set pulse width range in the signal;
step 2: the amplitude triggering module outputs an amplitude triggering signal when capturing a signal exceeding the set voltage amplitude in the signal;
step 3: and the pulse width trigger signal and the amplitude trigger signal pass through a logic AND circuit, and output a final trigger signal to control the high-speed data acquisition module to complete acquisition and storage operation of the laser narrow pulse.
In the step 1, the pulse width triggering module sets an effective triggering pulse width range according to pulse width characteristic parameters of the laser narrow pulse, and the pulse width triggering module outputs a pulse width triggering signal when capturing the pulse in the set effective triggering pulse width range in the signal, so as to filter clutter signals with over-limited pulse width; the minimum value of the triggering pulse width of the pulse width triggering module is 10ns, and the maximum value is 1 mu s.
In the step 2, the amplitude triggering module sets an effective amplitude triggering level according to the voltage amplitude characteristic parameter of the laser narrow pulse, and when the amplitude triggering module captures the voltage amplitude of the signal exceeding the set effective amplitude triggering level in the signal, the amplitude triggering module outputs an amplitude triggering signal, so as to filter clutter signals with small amplitude; the effective amplitude triggering level is 0.1V at the minimum and is the upper limit of the digital acquisition module at the maximum.
In the step 3, the pulse width trigger signal output by the pulse width trigger module and the amplitude trigger signal output by the amplitude trigger module output final trigger signals after logical AND, so that a single trigger is prevented from being easily triggered by mistake, and the effective signal part of the laser narrow pulse is ensured to be collected.
Example 1
As shown in fig. 1, the present embodiment provides a high-speed data acquisition module with a high-sensitivity trigger, including: the high-speed data acquisition module can acquire and store laser pulse signals under the control of trigger signals output by the high-sensitivity trigger, wherein:
the high sensitivity trigger has two trigger modules of pulse width trigger and amplitude trigger, as shown in FIG. 3, the pulse width trigger module searches the signal for the rising edge and the falling edge of the pulse signal, and takes the 50% position of the peak value of the rising edge of the pulse as the pulse width starting point P s The 50% position of the peak value of the falling edge of the pulse is taken as the pulse width termination point P t Calculating the pulse width lambda from the sampling rate and comparing with the set pulse width range if the pulse width is within the set range, i.e. lambda min <λ<λ max And outputting a pulse width trigger signal, otherwise, not outputting the trigger signal when the condition is not satisfied.
As shown in fig. 4, the amplitude triggering module searches the signal for a pulse signal rising edge and interprets the amplitude V of the signal spike f And position P f And judging whether the peak amplitude exceeds a set level threshold, if so, outputting an amplitude trigger signal, otherwise, not outputting the trigger signal.
The high-sensitivity trigger has a pulse width and amplitude combined triggering function, and can effectively capture laser narrow pulse signals by reasonably configuring the trigger according to two characteristic parameters of the pulse width and the amplitude of the laser narrow pulse, so that the high-speed data acquisition module is ensured to be capable of acquiring effective laser pulse waveform data, and the reliability of a laser pulse acquisition system is ensured.
When the laser narrow pulse signal is converted into an electric pulse signal by the laser detector, clutter is easily generated due to the influence of interference signals in the environment, and the acquisition system is triggered by errors to acquire invalid data.
Whether the high-sensitivity trigger outputs a trigger signal depends on two conditions, wherein the first condition is that the pulse width trigger signal and the amplitude trigger signal output one path of trigger signal through a logic AND circuit, and the second condition is that whether the positions of signals captured by the two triggers are consistent or not is judged by judging that the basis is P s <P f <P t And if the condition is met, outputting a final trigger signal, and controlling the high-speed data acquisition module to finish the operations such as acquisition and storage of the laser narrow pulse.
Example 2
The embodiment provides a high-speed data acquisition module with a high-sensitivity trigger, which comprises: the high-speed data acquisition module can acquire and store laser pulse signals under the control of trigger signals output by the high-sensitivity trigger, wherein:
the high-sensitivity trigger is provided with a pulse width trigger module and an amplitude trigger module, and the pulse width trigger module outputs a pulse width trigger signal when capturing a pulse with a set pulse width range in a signal; the amplitude triggering module outputs an amplitude triggering signal when capturing a signal exceeding the set voltage amplitude in the signal; and the pulse width trigger signal and the amplitude trigger signal pass through a logic AND circuit and output a final trigger signal to control the high-speed data acquisition module to finish the operations such as acquisition and storage of the laser narrow pulse.
The high-speed data acquisition module acquires and stores signals under the control of trigger signals output by the high-sensitivity trigger, the data length stored each time can be set, and the data length is usually set to be more than 2 times of the pulse width. The high-speed data acquisition module can set the front trigger length and the rear trigger length, so that the rising edge and the falling edge of the pulse can be accurately acquired and stored.
In summary, the invention belongs to the technical field of photoelectric testing, and particularly relates to a variable-interval laser narrow pulse combined capturing system and method. The invention has the characteristics of configurable trigger parameters, settable sampling rate and high sampling rate, is suitable for capturing narrow pulse signals which cannot be predicted and mastered in the transmission rule, and mainly solves the problems of capturing and collecting narrow pulses of variable-interval laser. The technology adopts a high-speed data acquisition module with a high-sensitivity trigger to form a laser pulse acquisition system. The invention captures the laser narrow pulse by adopting the high-sensitivity trigger which has the combined triggering function of pulse width and amplitude, and reasonably configures the high-sensitivity trigger according to the characteristic parameters of the laser narrow pulse, so that the laser narrow pulse signal can be effectively captured, thereby ensuring that a high-speed data acquisition module can acquire effective laser pulse waveform data and ensuring the reliability of a laser pulse acquisition system.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (10)
1. A variable interval laser narrow pulse combined capture system, the combined capture system comprising: combining a trigger and a high-speed data acquisition module;
the combined trigger is provided with two trigger modules, namely a pulse width trigger module and an amplitude trigger module, wherein the pulse width trigger module is used for outputting a pulse width trigger signal when a pulse with a set pulse width range is captured in the signal; the amplitude triggering module is used for outputting an amplitude triggering signal when the signal is captured in the signal and exceeds the set voltage amplitude; and the pulse width trigger signal and the amplitude trigger signal pass through a logic AND circuit, and output a final trigger signal to control the high-speed data acquisition module to complete acquisition and storage operation of the laser narrow pulse.
2. The variable interval laser narrow pulse combined capturing system according to claim 1, wherein the pulse width triggering module is configured to set an effective triggering pulse width range according to pulse width characteristic parameters of the laser narrow pulse, and the pulse width triggering module outputs a pulse width triggering signal when capturing a pulse in the set effective triggering pulse width range in the signal, so as to filter clutter signals with over-limited pulse width.
3. The variable interval laser narrow pulse combination capture system of claim 2, wherein the pulse width triggering module triggers a minimum of 10ns and a maximum of 1 μs of pulse width.
4. The variable interval laser narrow pulse combined capturing system according to claim 1, wherein the amplitude triggering module is configured to set an effective amplitude triggering level according to a voltage amplitude characteristic parameter of the laser narrow pulse, and the amplitude triggering module outputs an amplitude triggering signal when capturing a voltage amplitude of the signal exceeding the set effective amplitude triggering level in the signal, so as to filter clutter signals with small amplitudes.
5. The variable interval laser narrow pulse combination capture system as claimed in claim 4, wherein said effective amplitude trigger level is at least 0.1V and at most the upper limit of the digital acquisition module.
6. The variable interval laser narrow pulse combined capturing system according to claim 1, wherein the pulse width trigger signal output by the pulse width trigger module and the amplitude trigger signal output by the amplitude trigger module output final trigger signals after logical AND, so that a single trigger is prevented from being easily triggered by mistake, and the effective signal part of the laser narrow pulse is ensured to be collected.
7. A variable interval laser narrow pulse combination capture method, characterized in that the combination capture method is implemented based on the variable interval laser narrow pulse combination capture system of claim 1, the variable interval laser narrow pulse combination capture method comprising the steps of:
step 1: the pulse width triggering module outputs a pulse width triggering signal when capturing a pulse with a set pulse width range in the signal;
step 2: the amplitude triggering module outputs an amplitude triggering signal when capturing a signal exceeding the set voltage amplitude in the signal;
step 3: and the pulse width trigger signal and the amplitude trigger signal pass through a logic AND circuit, and output a final trigger signal to control the high-speed data acquisition module to complete acquisition and storage operation of the laser narrow pulse.
8. The method according to claim 7, wherein in the step 1, the pulse width triggering module sets an effective triggering pulse width range according to pulse width characteristic parameters of the laser narrow pulses, and the pulse width triggering module outputs a pulse width triggering signal when capturing the pulses in the set effective triggering pulse width range in the signal, so as to filter clutter signals with over-limited pulse width; the minimum value of the triggering pulse width of the pulse width triggering module is 10ns, and the maximum value is 1 mu s.
9. The method according to claim 7, wherein in the step 2, the amplitude triggering module sets an effective amplitude triggering level according to a voltage amplitude characteristic parameter of the laser narrow pulse, and when the amplitude triggering module captures a voltage amplitude of the signal exceeding the set effective amplitude triggering level, the amplitude triggering module outputs an amplitude triggering signal, so as to filter clutter signals with small amplitude; the effective amplitude triggering level is 0.1V at the minimum and is the upper limit of the digital acquisition module at the maximum.
10. The method of claim 7, wherein in step 3, the pulse width trigger signal output by the pulse width trigger module and the amplitude trigger signal output by the amplitude trigger module output a final trigger signal after logical AND, so as to avoid that a single trigger is easy to trigger by mistake, and ensure that the effective signal part of the laser narrow pulse is collected.
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