CN104458017B - A kind of measurement apparatus and method of high-frequency narrow-pulse energy - Google Patents
A kind of measurement apparatus and method of high-frequency narrow-pulse energy Download PDFInfo
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- CN104458017B CN104458017B CN201410752484.5A CN201410752484A CN104458017B CN 104458017 B CN104458017 B CN 104458017B CN 201410752484 A CN201410752484 A CN 201410752484A CN 104458017 B CN104458017 B CN 104458017B
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Abstract
The invention discloses a kind of measurement apparatus and method of high-frequency narrow-pulse energy, relevant apparatus includes：Signal extracting circuit, ladder integrating circuit, delayed step integrating circuit, delay circuit, and data acquisition control and process circuit；Wherein, input of the output end of the signal extracting circuit respectively with the ladder integrating circuit and delayed step integrating circuit is connected；The ladder integrating circuit is connected with input of the output end of delayed step integrating circuit with data acquisition control and process circuit；The control output end of the data acquisition control and process circuit is connected with the control signal of delay circuit；Control signal of the control output end of the delay circuit respectively with the ladder integrating circuit and delayed step integrating circuit is connected.Device and method disclosed by the invention utilizes the sampling nature of electric capacity, and continuous integration sampling is carried out to high-frequency burst pulse, coordinates data acquisition control and process circuit to realize the measurement of high-frequency narrow-pulse energy.
Description
Technical field
The present invention relates to impulsive measurement technical field, more particularly to a kind of measurement apparatus of high-frequency narrow-pulse energy and side
Method.
Background technology
The energy of measurement high-frequency burst pulse is needed in many instrument and equipments, especially in optical instrument field, such as
In quantum key distribution system, if the change of emitted luminescence intensity can be measured, with regard to quantum key distribution system hair can be analyzed
Penetrate the transmitting situation at end.
However, due to narrow pulse signal pulse width, frequency is high, can not be made of traditional mono signal peak sampling hold circuit
Amplitude measurement to individual signals measures；Thus a kind of scheme that can measure each high-frequency narrow-pulse signal is researched and developed to show
Obtain particularly important.
The content of the invention
It is an object of the invention to provide a kind of measurement apparatus and method of high-frequency narrow-pulse energy, and it utilizes the sampling of electric capacity
Characteristic, continuous integration sampling is carried out to high-frequency burst pulse, coordinates data acquisition control and process circuit to realize high frequency
The measurement of burst pulse energy.
The purpose of the present invention is achieved through the following technical solutions：
A kind of measurement apparatus of high-frequency narrow-pulse energy, the device include：
Signal extracting circuit, the first ladder integrating circuit, the second ladder integrating circuit, delay circuit, and data acquisition
Control and process circuit；Second ladder integrating circuit is delayed step integrating circuit；
Wherein, the output end of the signal extracting circuit integrates with the first ladder integrating circuit and the second ladder respectively
The input of circuit is connected；The output end of the first ladder integrating circuit and the second ladder integrating circuit with data acquisition control
System is connected with the input of process circuit；The control of the control output end and delay circuit of the data acquisition control and process circuit
Input processed is connected；The control output end of the delay circuit integrates with the first ladder integrating circuit and the second ladder respectively
The control signal of circuit is connected.
Further, the first ladder integrating circuit includes with the second ladder integrating circuit：Input, reversely amplification
Device, Controllable Active integration module and control signal；
Wherein, the input, sign-changing amplifier and Controllable Active integration module are sequentially connected；The Controllable Active integration
The control terminal of module is also connected with the control signal.
Further, the data acquisition control and process circuit include：Input, ultra high speed A/D conversion module, at data
Manage module, control module, interface module and control output end；
Wherein, input, ultra high speed A/D conversion module, data processing module and interface module are sequentially connected；The control mould
Block control terminal is also sequentially connected with ultra high speed A/D conversion module, data processing module and interface module respectively, its output end and control
Output end is connected.
Further, the device also includes：
Threshold value discriminator circuit, its input are connected with the first ladder integrating circuit output end, its output end and delay
Circuit input end is connected.
Further, the threshold value discriminator circuit includes：Input, comparator, threshold setting module and output end；
Wherein, input is connected with the comparison signal input of comparator respectively with threshold setting module, the comparator
Threshold signal output end is connected with the output end.
A kind of method that aforementioned means realize high-frequency narrow-pulse energy measurement, this method include：
After signal extracting circuit takes out high-frequency narrow-pulse signal, the first ladder integrating circuit and the second ladder are separately input into
Integrating circuit；Second ladder integrating circuit is delayed step integrating circuit；
The first ladder integrating circuit enters to the high-frequency narrow-pulse signal received respectively with the second ladder integrating circuit
Row continuous integral, stepped signal is formed, and exported to data acquisition control and process circuit；
Wherein, second circuit comes respectively to ladder integrating circuit and the second ladder integrating circuit according to output control signal
Control the time delay of the first ladder integrating circuit and the second ladder integrating circuit；The control signal controls the second ladder integrating circuit to exist
First ladder integrating circuit is integrated again after starting integration, and controls the second ladder integrating circuit in the first ladder integrating circuit
Electric discharge starts to discharge after terminating；
The delay control signal that the control signal is exported by delay circuit according to data acquisition control and process circuit come
Output.
Further, the input of the first ladder integrating circuit and the second ladder integrating circuit receives signal taking-up
After the signal of circuit output, reversely amplified by one-level, after driving isolation, integrated into Controllable Active integration module,
Before the Controllable Active integration module receives switch closing control signal, received signal integrates to be had controllable
On electric capacity in the integration module of source, stepped signal is formed；
When the Controllable Active integration module receives switch closing control signal, the electric charge on electric capacity is discharged,
Electric discharge terminates, and switch will be opened, and signal is continued to integrate.
Further, data acquisition control and process circuit receive the first ladder integrating circuit and the second ladder integrating circuit
The signal of output, and analog-to-digital conversion is carried out via ultra high speed A/D conversion module under the control of control module, utilize data processing mould
Block carries out data processing, then is exported by interface module to external equipment；
Also, the control module is additionally operable to export delay control signal to delay circuit.
Further, this method also includes：The output end of the first ladder integrating circuit also with threshold value discriminator circuit phase
Even, the output signal of the first ladder integrating circuit, when the output signal reaches predetermined condition, threshold are screened by threshold value discriminator circuit
It is worth discriminator circuit and exports a threshold signal to delay circuit；
The delays time to control exported by the delay circuit according to the threshold signal and data acquisition control and process circuit is believed
Number carry out output control signal.
Further, the output signal that the first ladder integrating circuit is screened by threshold value discriminator circuit, when the output is believed
When number reaching predetermined condition, threshold value discriminator circuit, which exports threshold signal a to delay circuit, to be included：
The discriminator circuit receives the output signal of the first ladder integrating circuit, and by the output signal with it is set in advance
Threshold value is compared；
When the voltage amplitude of the output signal is higher than threshold value, threshold value discriminator circuit exports a threshold signal to the electricity that is delayed
Road.
As seen from the above technical solution provided by the invention, simulated using the sampling retention performance and utilization of electric capacity
The switching characteristic of switch carries out repid discharge and ALTERNATE SAMPLING, to complete under high repetition frequency to the energy integral of each burst pulse
And amplitude sample, and high-speed AD (modulus) conversion and data processing are carried out, and then realize the measurement of high-frequency narrow-pulse energy.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill in field, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of schematic diagram of the measurement apparatus for high-frequency narrow-pulse energy that the embodiment of the present invention one provides；
Fig. 2 is the schematic diagram of the first ladder integrating circuit that the embodiment of the present invention one provides and the second ladder integrating circuit；
Fig. 3 is the schematic diagram of the data acquisition control that the embodiment of the present invention one provides and process circuit；
Fig. 4 is the schematic diagram of the measurement apparatus for another high-frequency narrow-pulse energy that the embodiment of the present invention one provides；
Fig. 5 is the schematic diagram for the threshold value discriminator circuit that the embodiment of the present invention one provides；
Fig. 6 is the schematic diagram for the signal transacting sequential that the embodiment of the present invention two provides.
Embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based on this
The embodiment of invention, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to protection scope of the present invention.
Embodiment one
Fig. 1 is a kind of schematic diagram of the measurement apparatus for high-frequency narrow-pulse energy that the embodiment of the present invention one provides.Such as Fig. 1 institutes
Show, the device mainly includes：
Signal extracting circuit, the first ladder integrating circuit, the second ladder integrating circuit, delay circuit, and data acquisition
Control and process circuit；Second ladder integrating circuit is delayed step integrating circuit；
Wherein, the output end of the signal extracting circuit integrates with the first ladder integrating circuit and the second ladder respectively
The input of circuit is connected；The output end of the first ladder integrating circuit and the second ladder integrating circuit with data acquisition control
System is connected with the input of process circuit；The control of the control output end and delay circuit of the data acquisition control and process circuit
Input processed is connected；The control output end of the delay circuit integrates with the first ladder integrating circuit and the second ladder respectively
The control signal of circuit is connected.
In order to make it easy to understand, elaborated below for each of the above circuit.
1) signal extracting circuit is used to take out high-frequency narrow-pulse signal and can as the input of subsequent conditioning circuit, high-frequency narrow-pulse
To produce using various principles, for example burst pulse light source is carried out to obtain after opto-electronic conversion, finally give voltage signal output；
The signal of circuit output is taken out from high-frequency narrow-pulse, is divided into two-way, is separately input into the first ladder integrating circuit and the second ladder
Integrating circuit.
2) the first ladder integrating circuit is consistent with the structure of the second ladder integrating circuit, and it differs only in the second ladder product
Parallel circuit is that delay is integrated for a period of time after the first ladder integrating circuit is integrated, it is ensured that is integrated in the first ladder
The pulse that may be missed when circuit discharging, by the second ladder integrating circuit come integral measurement, it is ensured that each pulse is tested
To measure, the first ladder integrating circuit is integrated with the second ladder integrating circuit using electric capacity to the current signal of input, and
Form stepped integral voltage signal.
As shown in Fig. 2 the first ladder integrating circuit includes with the second ladder integrating circuit：Input, reversely put
Big device, Controllable Active integration module and control signal；Wherein, the input, sign-changing amplifier and Controllable Active integration mould
Block is sequentially connected；The control terminal of the Controllable Active integration module is also connected with the control signal.
3) delay circuit is used to distinguish output control signal to the first ladder integrating circuit and the second ladder integrating circuit, comes
Control the time delay of the first ladder integrating circuit and the second ladder integrating circuit；The control signal is adopted by delay circuit according to data
Collection is controlled with the delay control signal of process circuit output to export.
4) data acquisition control and process circuit, for being located again after the integrated signal received is carried out into analog-to-digital conversion
Reason, obtain the energy value of each high-frequency narrow-pulse；Meanwhile also export delay control signal to delay circuit.
As shown in figure 3, the data acquisition control and process circuit include：Input, ultra high speed A/D conversion module, at data
Manage module, control module, interface module and control output end；
Wherein, input, ultra high speed A/D conversion module, data processing module and interface module are sequentially connected；The control mould
Block control terminal is also sequentially connected with ultra high speed A/D conversion module, data processing module and interface module respectively, its output end and control
Output end is connected.
Further, the device can also include：Threshold value discriminator circuit, its input and the first ladder integrating circuit
Output end is connected, and its output end is connected with delay circuit input, specific schematic diagram shown in Figure 4.
Threshold value discriminator circuit screens the output signal of the first ladder integrating circuit, when the output signal reaches predetermined condition
(for example, when the voltage amplitude of output signal is higher than threshold value, and the setting of threshold value is typically in half of Integrated peak or so), threshold value
Discriminator circuit exports a threshold signal to delay circuit；By the delay circuit according to the threshold signal and data acquisition control
Carry out output control signal with the delay control signal of process circuit output, i.e. the discharge control signal of the first ladder integrating circuit is
Provided after the setting value that is delayed after threshold signal, after the discharge control signal of the second ladder integrating circuit is threshold signal
Another setting value of delay after provide, this delay adjustmentses value is longer than previous delay adjustmentses, and ensures that two integrating circuit are put
Electric time interval is misaligned.
As shown in figure 5, the threshold value discriminator circuit includes：Input, comparator, threshold setting module and output end；
Wherein, input is connected with the comparison signal input of comparator respectively with threshold setting module, the comparator
Threshold signal output end is connected with the output end.
Sampling retention performance of the embodiment of the present invention using electric capacity and the switching characteristic using analog switch carry out quick
Electric discharge and ALTERNATE SAMPLING, to complete to the energy integral and amplitude sample of each burst pulse under high repetition frequency, and carry out at a high speed
AD conversion and data processing, and then realize the measurement of high-frequency narrow-pulse energy.
Embodiment two
The embodiment of the present invention provides a kind of measuring method of high-frequency narrow-pulse energy, and this method can be based on the institute of embodiment one
The device of offer realizes that finally obtain the energy value of each high-frequency narrow-pulse, it mainly includes：
After signal extracting circuit takes out high-frequency narrow-pulse signal, the first ladder integrating circuit and the second ladder are separately input into
Integrating circuit；Second ladder integrating circuit is delayed step integrating circuit；
The first ladder integrating circuit enters to the high-frequency narrow-pulse signal received respectively with the second ladder integrating circuit
Row continuous integral, stepped signal is formed, and exported to data acquisition control and process circuit；
Wherein, delay circuit is believed to the first ladder integrating circuit with the second ladder integrating circuit according to output control respectively
Number, to control the time delay of the first ladder integrating circuit and people's ladder integrating circuit；The control signal controls the second ladder integration
Circuit is integrated again after the first ladder integrating circuit starts integration, and controls the second ladder integrating circuit to be accumulated in the first ladder
Parallel circuit electric discharge starts to discharge after terminating；
The delay control signal that the control signal is exported by delay circuit according to data acquisition control and process circuit come
Output.
In order to make it easy to understand, elaborated below for this method.
1) high-frequency narrow-pulse signal takes out and exported.
Signal extracting circuit is signal transacting source, and high-frequency narrow-pulse can be produced by various sensors, or from its
Its device and equipment input, and pre-processed, such as the optical signal for ultra-narrow pulse, pass through the pole of photoelectricity two of high-speed response
Manage (PIN pipes) and carry out the conversion of photosignal, and carry out pre-amplification, the embodiment of the present invention is less than 25ns mainly for the sigtnal interval
Narrow pulse signal.
The signal of taking-up is divided into two-way by signal extracting circuit, is inputted all the way defeated to the first ladder integrating circuit, another way
Enter to the second ladder integrating circuit, be designated as Vi.
2) two-way ladder integrating circuit integrates.
First ladder integrating circuit connects to the high-frequency narrow-pulse signal received respectively with the second ladder integrating circuit
Continuous integration, forms stepped signal；Specifically, the input of the first ladder integrating circuit and the second ladder integrating circuit
After the signal for receiving signal extracting circuit output, by reversely amplifying, after driving isolation, into Controllable Active integration module
Integrated, before the Controllable Active integration module receives switch closing control signal, received signal is long-pending
Divide on the electric capacity in Controllable Active integration module, form stepped signal；When the Controllable Active integration module receives out
When closing closing control signal, the electric charge on electric capacity is discharged, and electric discharge terminates, and switch will be opened, and signal is continued to integrate.
The difference of the first ladder integrating circuit and the second ladder integrating circuit is the second ladder integrating circuit
One ladder integrating circuit is integrated again after starting integration, and the first ladder integrating circuit discharges after terminating and starts to discharge；That is,
Two ladder integrating circuit are that delay is integrated for a period of time after the first ladder integrating circuit is integrated, it is ensured that first
The pulse that ladder integrating circuit may be missed when electric discharge, by the second ladder integrating circuit come integral measurement, it is ensured that each arteries and veins
Punching is all measured to, and the first ladder integrating circuit and the second ladder integrating circuit are carried out using electric capacity to the current signal of input
Integration, and form stepped integral voltage signal.
Wherein, the control signal that the time delay of the first ladder integrating circuit and the second ladder integrating circuit is exported by delay circuit
To control；Specifically, the delays time to control that the delay circuit exports according to the data acquisition control and process circuit received is believed
Number SD, respectively to the first ladder integrating circuit and the second ladder integrating circuit output control signal D1 and D2, control signal D1 with
D2 will ensure that time delay integration circuit energy proper integral, vice versa, it is ensured that signal when the first ladder integrating circuit discharges
There is no test leakage；For the narrow pulse signal that can be discharged in signal interval, can be entered using the first ladder integrating circuit
Row integration electric discharge, while the second ladder integrating circuit is closed, it is possible to reduce the way that ADC is sampled in follow-up A/D convertor circuit.
Wherein, control signal D1 and D2 may have certain time delay, be designated as d1 and d2, d1 and d2 delay volume respectively
It can be determined according to actual conditions.
Preferably, threshold value discriminator circuit is may be incorporated into, threshold value discriminator circuit screens the output of the first ladder integrating circuit
Signal, when the output signal reaches predetermined condition (for example, when the voltage amplitude of output signal is higher than threshold value), threshold value screens electricity
Road exports a threshold signal T to delay circuit；By the delay circuit according to threshold signal T and data acquisition control and
The delay control signal SD of reason circuit output comes output control signal D1 and D2.
Wherein, delay function can have different implementations, for example be prolonged using independent analog delay line or numeral
When kind of thread elements, or T signal is directly inputted FPGA, delay function is realized using counter in FPGA, by data acquisition control
System and processing control SD signals to provide setting.
3) collection of ladder integrated signal, AD conversion and data processing.
Data acquisition control and process circuit receive the first ladder integrating circuit and the letter of the second ladder integrating circuit output
Number；Wherein, the first ladder integrator output signal is designated as V01, and the second ladder integrator output signal is designated as V02.
Then, analog-to-digital conversion is carried out via ultra high speed A/D conversion module under the control of control module, and utilizes data processing
Module carries out data processing, then is exported by interface module to external equipment.
It is related to multiple signals in the above method：The signal Vi of signal extracting circuit output, the first ladder integrating circuit and the
The delay control signal SD of the output signal V01 and V02 of two ladder integrating circuit, data acquisition control and process circuit output,
The threshold signal T of threshold value discriminator circuit output, the control signal D1 and D2 of delay circuit output；The processing sequential of above-mentioned signal is such as
Shown in Fig. 6,
Sampling retention performance of the embodiment of the present invention using electric capacity and the switching characteristic using analog switch carry out quick
Electric discharge and ALTERNATE SAMPLING, to complete to the energy integral and amplitude sample of each burst pulse under high repetition frequency, and carry out at a high speed
AD conversion and data processing, and then realize the measurement of high-frequency narrow-pulse energy.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (8)
1. a kind of measurement apparatus of high-frequency narrow-pulse energy, it is characterised in that the device includes：
Signal extracting circuit, the first ladder integrating circuit, the second ladder integrating circuit, delay circuit, and data acquisition control
And process circuit；Second ladder integrating circuit is delayed step integrating circuit；
Wherein, the output end of the signal extracting circuit respectively with the first ladder integrating circuit and the second ladder integrating circuit
Input be connected；The output end of the first ladder integrating circuit and the second ladder integrating circuit with data acquisition control and
The input of process circuit is connected；The control of the control output end and delay circuit of the data acquisition control and process circuit is defeated
Enter end to be connected；The control output end of the delay circuit respectively with the first ladder integrating circuit and the second ladder integrating circuit
Control signal be connected；
The device also includes：Threshold value discriminator circuit, its input are connected with the first ladder integrating circuit output end, and it is exported
End is connected with delay circuit input.
2. device according to claim 1, it is characterised in that the first ladder integrating circuit and the second ladder the integration electricity
Road includes：Input, sign-changing amplifier, Controllable Active integration module and control signal；
Wherein, the input, sign-changing amplifier and Controllable Active integration module are sequentially connected；The Controllable Active integration module
Control terminal be also connected with the control signal.
3. device according to claim 1, it is characterised in that the data acquisition control and process circuit include：Input
End, ultra high speed A/D conversion module, data processing module, control module, interface module and control output end；
Wherein, input, ultra high speed A/D conversion module, data processing module and interface module are sequentially connected；The control module control
End processed is also sequentially connected with ultra high speed A/D conversion module, data processing module and interface module respectively, and its output end exports with control
End is connected.
4. device according to claim 1, it is characterised in that the threshold value discriminator circuit includes：Input, comparator,
Threshold setting module and output end；
Wherein, input is connected with the comparison signal input of comparator respectively with threshold setting module, the threshold value of the comparator
Signal output part is connected with the output end.
5. a kind of method that high-frequency narrow-pulse energy measurement is realized using any one of claim 1-4 described device, its feature are existed
In this method includes：
After signal extracting circuit takes out high-frequency narrow-pulse signal, it is separately input into the first ladder integrating circuit and the second ladder integrates
Circuit；Second ladder integrating circuit is delayed step integrating circuit；
The first ladder integrating circuit connects to the high-frequency narrow-pulse signal received respectively with the second ladder integrating circuit
Continuous integration, stepped signal is formed, and exported to data acquisition control and process circuit；
Wherein, delay circuit comes respectively to the first ladder integrating circuit and the second ladder integrating circuit according to output control signal
Control the time delay of the first ladder integrating circuit and the second ladder integrating circuit；The control signal controls the second ladder integrating circuit to exist
First ladder integrating circuit is integrated again after starting integration, and controls the second ladder integrating circuit in the first ladder integrating circuit
Electric discharge starts to discharge after terminating；
The control signal is exported by delay circuit according to data acquisition control and the delay control signal of process circuit output；
This method also includes：The output end of the first ladder integrating circuit is also connected with threshold value discriminator circuit, is screened by threshold value
Circuit screens the output signal of the first ladder integrating circuit, and when the output signal reaches predetermined condition, threshold value discriminator circuit is defeated
Go out a threshold signal to delay circuit；By the delay circuit according to the threshold signal and data acquisition control and process circuit
The delay control signal of output carrys out output control signal.
6. according to the method for claim 5, it is characterised in that
The input of the first ladder integrating circuit and the second ladder integrating circuit receives the letter of signal extracting circuit output
After number, reversely amplified by one-level, after driving isolation, integrated into Controllable Active integration module, controllable had described
Before source integration module receives switch closing control signal, received signal is integrated in Controllable Active integration module
Electric capacity on, form stepped signal；
When the Controllable Active integration module receives switch closing control signal, the electric charge on electric capacity is discharged, and is discharged
Terminate, switch will be opened, and signal is continued to integrate.
7. according to the method for claim 5, it is characterised in that
Data acquisition control and process circuit receive the first ladder integrating circuit and the signal of the second ladder integrating circuit output, and
Analog-to-digital conversion is carried out via ultra high speed A/D conversion module under the control of control module, is carried out using data processing module at data
Reason, then exported by interface module to external equipment；
Also, the control module is additionally operable to export delay control signal to delay circuit.
8. according to the method for claim 5, it is characterised in that described that first ladder integration electricity is screened by threshold value discriminator circuit
The output signal on road, when the output signal reaches predetermined condition, threshold value discriminator circuit exports a threshold signal to the electricity that is delayed
Road includes：
The discriminator circuit receives the output signal of the first ladder integrating circuit, and by the output signal and threshold value set in advance
It is compared；
When the voltage amplitude of the output signal is higher than threshold value, threshold value discriminator circuit exports a threshold signal to delay circuit.
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| CN201410752484.5A CN104458017B (en) | 2014-12-09 | 2014-12-09 | A kind of measurement apparatus and method of high-frequency narrow-pulse energy |
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| CN104458017B true CN104458017B (en) | 2018-04-10 |
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| CN106053961B (en) * | 2016-07-06 | 2018-10-26 | 西北核技术研究所 | A kind of the pulse signal synchronous integration measuring device and method of anti-random noise |
| CN109167705B (en) * | 2018-09-06 | 2022-01-25 | 晶晨半导体(上海)股份有限公司 | Method and system for acquiring delay step time in storage module |
| CN111896102B (en) * | 2020-09-29 | 2020-12-11 | 北京瑞通科悦科技有限公司 | Early warning circuit and method for pulse energy limitation of semiconductor laser |
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| CN202092776U (en) * | 2011-06-01 | 2011-12-28 | 北京光电技术研究所 | Pulse laser energy measuring device |
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