CN112578173B - Optical lightning current measuring system and measuring method - Google Patents
Optical lightning current measuring system and measuring method Download PDFInfo
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- CN112578173B CN112578173B CN201910922465.5A CN201910922465A CN112578173B CN 112578173 B CN112578173 B CN 112578173B CN 201910922465 A CN201910922465 A CN 201910922465A CN 112578173 B CN112578173 B CN 112578173B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
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Abstract
The invention discloses an optical lightning current measuring system, comprising: the signal acquisition processing device comprises a programmable logic device, a laser power control circuit, a polarization maintaining laser, a laser power detector, a transimpedance amplifying circuit, an analog-to-digital conversion circuit and an output network port circuit, wherein the laser power control circuit receives an instruction sent by the programmable logic device and controls the polarization maintaining laser to output stable linear polarization laser; the sensing device comprises a first collimator, a polarizer, a magneto-optical crystal, an analyzer and a second collimator; a first optical fiber connecting the polarization maintaining laser and the first collimator; and a second optical fiber connecting the second collimator and the laser power detector. The induction device has no metal component, good insulativity, high safety performance and high measurement accuracy, and the signal acquisition and processing device can transmit the processing result to the far end, thereby effectively reducing the influence of interference, impact and the like.
Description
Technical Field
The invention belongs to the technical field of photoelectricity, in particular to an optical lightning current measuring system and an optical lightning current measuring method, which are used for solving the safety problem caused by lightning current measurement by utilizing a metal coil and the problem of influencing the lightning current measurement accuracy in the prior art.
Background
Lightning is a common natural phenomenon, and the strong discharge phenomenon of high-altitude electrified cloud layer can release huge energy in a short time, so that huge back-striking current and electromagnetic pulse radiation are generated. The energy released by the lightning process can damage various systems in the industries of building or electricity, petrifaction, communication, traffic, aviation, microelectronics and the like, and even cause secondary damage, so accurate measurement of lightning is a vital technology in lightning protection.
At present, the method for measuring lightning current at home and abroad is generally based on the electromagnetic induction principle, and the lightning current is induced by a rogowski coil to measure large current in the process of releasing lightning. In this process, the lightning current is often tens of kiloamperes, even more than two hundred kiloamperes, which requires that the coil for induction has very high insulation performance, otherwise the induction device becomes a power guiding device, which causes great harm to personnel or equipment. In addition, the coil has the limitations of magnetic saturation and hysteresis effect, and the nonlinear characteristic has a great influence on the accuracy of lightning current measurement. Therefore, designing and developing lightning current induction devices with good insulation without metal components is of great importance in lightning current measurement and lightning current protection.
Disclosure of Invention
The invention aims to solve the technical problems of providing an optical lightning current measuring system and an optical lightning current measuring method, which can solve the problems of safety caused by taking a metal coil as an induction device in the existing lightning current measuring technology, the problem that the measuring accuracy is influenced by the nonlinear characteristic of the coil, and the problem that the measuring device is easily interfered and impacted in a lightning generating area.
In order to solve the above technical problems, the optical lightning current measurement system provided by the present invention includes:
the signal acquisition processing device comprises a programmable logic device, a laser power control circuit, a polarization-maintaining laser, a laser power detector, a transimpedance amplifying circuit, an analog-to-digital conversion circuit and an output network port circuit, wherein the laser power control circuit receives an instruction sent by the programmable logic device and controls the polarization-maintaining laser to output stable linear polarization laser, the output end of the laser power detector is connected with the input end of the transimpedance amplifying circuit, the output end of the transimpedance amplifying circuit is connected with the input end of the analog-to-digital conversion circuit, the output end of the analog-to-digital conversion circuit is connected with the input end of the programmable logic device, and the programmable logic device is connected with the output network port circuit;
the sensing device comprises a first collimator, a polarizer, a magneto-optical crystal, an analyzer and a second collimator, wherein the linearly polarized laser output by the polarization-preserving laser sequentially passes through the first collimator, the polarizer, the magneto-optical crystal, the analyzer and the second collimator and then reaches the laser power detector;
the first optical fiber is connected with the polarization maintaining laser and the first collimator and is used for receiving the linear polarization laser output by the polarization maintaining laser and outputting the linear polarization laser to the first collimator;
And the second optical fiber is connected with the second collimator and the laser power detector and is used for receiving the linearly polarized laser output by the second collimator and outputting the linearly polarized laser to the laser power detector.
Further, the polarization direction of the linear polarization laser light output by the polarization maintaining laser is consistent with the fast axis direction of the first optical fiber.
Further, the polarization direction of the polarizer is consistent with the fast axis direction of the first optical fiber.
Further, the polarization direction of the analyzer is consistent with the fast axis direction of the second optical fiber and forms an included angle with the polarization direction of the polarizer.
Preferably, an included angle of 45 degrees is formed between the polarization direction of the analyzer and the polarization direction of the polarizer.
Further, the fast axis direction of the first optical fiber and the fast axis direction of the second optical fiber form an included angle of 45 degrees.
Further, the first optical fiber is a panda-type polarization maintaining optical fiber or an elliptic polarization maintaining optical fiber or a bow tie type polarization maintaining optical fiber, and the second optical fiber is a panda-type polarization maintaining optical fiber or an elliptic polarization maintaining optical fiber or a bow tie type polarization maintaining optical fiber.
Further, the input of the first collimator is linear polarized laser light output by the first optical fiber, and the output is parallel polarized laser light.
Further, the magneto-optical crystal is yttrium iron garnet, terbium gallium garnet or terbium aluminum garnet.
Meanwhile, the invention also provides an optical lightning current measuring method, wherein:
A programmable logic device is utilized to send out an instruction to a laser power control circuit;
The laser power control circuit performs closed-loop control on the optical power and controls the polarization-preserving laser to output stable linear polarized laser, and the linear polarized laser is transmitted to the sensing device through the first optical fiber;
receiving the linear polarized laser output by the induction device by using a laser power detector, and converting the optical power into an analog current signal;
converting an analog current signal output by the laser power detector into an analog voltage signal by using a transimpedance amplification circuit and amplifying the analog voltage signal;
Converting an analog voltage signal output by the transimpedance amplifying circuit into a digital signal by utilizing an analog-to-digital conversion circuit;
calculating the digital signals output by the analog-to-digital conversion circuit by using a programmable logic device to obtain lightning current parameters and lightning current waveforms;
And outputting the lightning current parameters and the lightning current waveforms to the far end by using an output network port circuit.
Compared with the prior art, the invention has the beneficial effects that:
Firstly, the induction device in the measuring system adopts the magneto-optical crystal to replace the existing rogowski coil, when a magnetic field generated by lightning current acts on the magneto-optical crystal, the external magnetic field rotates the polarization direction of linear polarization laser passing through the magneto-optical crystal, the light power of the transmitted linear polarization laser output by the induction device can measure the magnitude of lightning current generating the magnetic field applied to the induction device, and the induction device has no any metal component, has good insulating property and high safety performance, and has remarkable advantages for measuring the lightning current up to 200 KA;
secondly, the magneto-optical crystal is adopted, so that the influence of the magnetic saturation characteristic of the existing coil and the nonlinearity of the hysteresis effect on the lightning current measurement accuracy is overcome, and the accuracy of the measurement result is improved;
Thirdly, the measuring system of the invention adopts a signal acquisition processing device connected with the sensing device through optical fibers, and the device utilizes a transimpedance amplifying circuit, an analog-digital conversion circuit, a programmable logic device and an output network port circuit to carry out subsequent processing on the current output by the laser power detector, so that not only can lightning current waveforms be obtained, but also important parameter data and the like can be obtained through calculation, and the important parameter data and the like can be sent to a far end for checking or carrying out required application through the output network port circuit, the transmission distance can reach several kilometers, and the device can be far away from a lightning current action area, thereby effectively reducing the influence of interference, impact and the like.
Drawings
FIG. 1 is a block diagram of an optical lightning current measurement system of the invention;
FIG. 2 is a signal transmission diagram of an optical lightning current measurement system of the invention;
FIG. 3 is a schematic diagram of the components of the sensing device of the optical lightning current measurement system of the invention;
FIG. 4 is a flow chart of the optical lightning current measurement method of the invention.
Wherein the reference numerals are as follows:
1 is a signal acquisition and processing device; 11 is a programmable logic device; 12 is a laser power control circuit; 13 is polarization maintaining laser; 14 is a laser power detector; 15 is a transimpedance amplifying circuit; 16 is an analog-to-digital conversion circuit; 17 is an output network port circuit; 2 is an induction device; 21 is a first collimator; 22 is a polarizer; 23 is a magneto-optical crystal; 24 is an analyzer; 25 is a second collimator; 3 is a first optical fiber; 4 is a second optical fiber.
Detailed Description
Other advantages and effects of the present invention will become readily apparent to those skilled in the art from the following disclosure, when considered in light of the accompanying drawings, illustrating embodiments of the present invention by way of specific embodiments. In the following description, specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced or carried out in other, different embodiments, and details of the present description may be set forth in various different manners and applications, as those skilled in the art may readily devise various arrangements and substitutions without departing from the spirit of the present invention.
First embodiment
The optical lightning current measuring system of the invention, as shown in fig. 1, comprises:
The signal acquisition processing device 1 comprises a programmable logic device 11 (Programmable Logic Device, PLD for short), a laser power control circuit 12, a polarization-preserving laser 13, a laser power detector 14, a transimpedance amplifying circuit 15, an analog-digital conversion circuit 16 and an output network port circuit 17, wherein the laser power control circuit 12 receives an instruction sent by the programmable logic device 11 and controls the polarization-preserving laser 13 to output stable linear polarization laser, the output end of the laser power detector 14 is connected with the input end of the transimpedance amplifying circuit 15, the output end of the transimpedance amplifying circuit 15 is connected with the input end of the analog-digital conversion circuit 16, the output end of the analog-digital conversion circuit 16 is connected with the input end of the programmable logic device 11, and the programmable logic device 11 is connected with the output network port circuit 17;
the sensing device 2 includes a first collimator 21, a polarizer 22, a magneto-optical crystal 23, an analyzer 24, and a second collimator 25, as shown in fig. 3, the linearly polarized laser light output by the polarization-preserving laser 13 sequentially passes through the first collimator 21, the polarizer 22, the magneto-optical crystal 23, the analyzer 24, and the second collimator 25, and then reaches the laser power detector 14;
A first optical fiber 3 connecting the polarization maintaining laser 13 and the first collimator 21, for receiving the linearly polarized laser light output from the polarization maintaining laser 13 and outputting the linearly polarized laser light to the first collimator 21;
and a second optical fiber 4, which connects the second collimator 25 and the laser power detector 14, and is configured to receive the linearly polarized laser light output by the second collimator 25 and output the linearly polarized laser light to the laser power detector 14.
The optical lightning current measuring system is designed based on Faraday effect, which refers to the phenomenon that the polarization direction of transmitted light rotates when a beam of linearly polarized light passes through a medium placed in a magnetic field. The magneto-optical crystal adopted by the invention is an optical information functional material with Faraday effect, the magnetic field generated by lightning current acts on the magneto-optical crystal 23 of the induction device 2, and the change of the output optical power reflects the magnitude of the magnetic field and simultaneously reflects the magnitude of lightning current after the linear polarized laser passes through the first optical fiber 3, the induction device 2 and the second optical fiber 4.
The calculation formula of the rotation angle θ of the linearly polarized light is as follows:
θ＝VBd
Where V is the Verdet constant, is the intrinsic proportionality coefficient of the substance, B is the strength of the magnetic field, and d is the length of the magneto-optical crystal.
The magnetic field strength B can be calculated from the biot-savart law as follows:
Wherein u 0 is vacuum magnetic permeability, r 0 is distance between the magneto-optical crystal and the center of the lightning-induced wire, and θ 1 and θ 2 are included angles between two endpoints of the lightning-induced wire acting part and connecting line of the magneto-optical crystal and the lightning-induced wire respectively.
The optical lightning current measurement method using the optical lightning current measurement system is shown in fig. 4, wherein:
Using the programmable logic device 11 to issue instructions to the laser power control circuit 12;
The laser power control circuit 12 performs closed-loop control on the optical power, and controls the polarization-preserving laser 13 to output stable linear polarized laser, and the linear polarized laser is transmitted to the sensing device 2 through the first optical fiber 3;
Receiving the linearly polarized laser light output by the sensing device 2 by using a laser power detector 14, and converting the optical power into an analog current signal;
converting the analog current signal output by the laser power detector 14 into an analog voltage signal by using a transimpedance amplification circuit 15 and amplifying the analog voltage signal;
converting the analog voltage signal output by the transimpedance amplifying circuit 15 into a digital signal by using an analog-to-digital conversion circuit 16;
calculating the digital signal output by the analog-to-digital conversion circuit 16 by using a programmable logic device 11 to obtain lightning current parameters and lightning current waveforms;
And outputting the lightning current parameters and the lightning current waveforms to the far end by using an output network port circuit 17.
In the present embodiment, the laser power control circuit 12 may be implemented in various ways, for example: wei Jiming, ma Xiaochun an Automatic Power Control (APC) function module for a semiconductor laser [ J ]. Micro-nano electronics 1990,4:14-17; zhang Ying, zhang Ruifeng, yang Qing. Semiconductor laser automatic power control circuit design [ J ]. Electronics world.2014, 1:57-59,62; liu Cheng, liu Wei. Semiconductor laser output power automatic control circuit [ J ]. Power Environment protection. 2004,20 (2): 56-58.
Similarly, the transimpedance amplifier 15 may be an operational amplifier of ADI corporation, the analog-to-digital converter 16 may be an analog-to-digital converter of ADI corporation, and of course, those skilled in the art may also use other circuits, which are known in the art and the output port circuit 17, and therefore will not be described in detail.
The induction device in the measuring system of the embodiment adopts the magneto-optical crystal 23 to replace the existing rogowski coil, when the magnetic field generated by the lightning current acts on the magneto-optical crystal 23, the external magnetic field rotates the polarization direction of the linear polarization laser passing through the magneto-optical crystal 23, the light power of the transmitted linear polarization laser output by the induction device 2 can measure the magnitude of the lightning current generating the magnetic field applied to the induction device, and the induction device has no any metal component, has good insulating property and high safety performance, and has remarkable advantages for measuring the lightning current up to 200 KA. And the magneto-optical crystal overcomes the influence of the nonlinearity of the magnetic saturation characteristic and hysteresis effect of the existing coil on the accuracy of lightning current measurement, thereby improving the accuracy of the measurement result.
Meanwhile, the signal acquisition processing device adopted by the measuring system of the embodiment utilizes the transimpedance amplifying circuit, the analog-to-digital conversion circuit, the programmable logic device and the output network port circuit to carry out subsequent processing on the current output by the laser power detector, so that not only can the lightning current waveform be obtained, but also important parameter data and the like can be obtained through calculation, and the important parameter data and the like can be sent to a far end for checking or carrying out required application through the output network port circuit, the transmission distance can reach several kilometers, the lightning current action area can be kept away, and the influence of interference, impact and the like can be effectively reduced.
Second embodiment
On the basis of the first embodiment, this embodiment further describes the relationship among the polarization direction of the linearly polarized laser light output from the sensing device polarization maintaining laser 13, the fast axis direction of the first optical fiber 3, the polarization direction of the polarizer 22, the polarization direction of the analyzer 24, and the fast axis direction of the second optical fiber 4.
The polarization direction of the linearly polarized laser light output from the polarization maintaining laser 13 coincides with the fast axis direction of the first optical fiber 3.
The polarization direction of the polarizer 22 coincides with the fast axis direction of the first optical fiber 3.
The polarization direction of the analyzer 24 coincides with the fast axis direction of the second optical fiber 4 and forms an angle with the polarization direction of the polarizer 22. Preferably, the polarization direction of analyzer 24 forms an angle of 45 ° with the polarization direction of polarizer 22.
The fast axis direction of the first optical fiber 3 and the fast axis direction of the second optical fiber 4 form an angle of 45 °.
The description of the parts of the whole optical lightning current measuring system is as follows:
The polarization-preserving laser 13 outputs stable linear polarization laser and outputs the stable linear polarization laser to the first optical fiber 3 to provide a measurable basis for lightning current measurement;
A laser power control circuit 12 for ensuring stable output light power of the polarization maintaining laser 13 by closed loop control of light power and temperature;
a first optical fiber 3 that receives and conducts stable linearly polarized laser light for measurement output from the polarization-preserving laser 13;
A first collimator 21 for inputting the linear polarized laser light outputted from the first optical fiber 3 and outputting the linear polarized laser light;
a polarizer 22 having a polarization direction coincident with the fast axis direction of the first optical fiber 3;
A magneto-optical crystal 23, in which an applied magnetic field generated by a lightning current can rotate the polarization direction of the linearly polarized laser light passing through it;
An analyzer 24 having a polarization direction forming an angle of 45 ° with the polarization direction of the polarizer 22 and aligned with the fast axis direction of the second optical fiber 4;
a second collimator 25 for outputting parallel polarized laser light from the magneto-optical crystal 23 and coupling the parallel polarized laser light to the second optical fiber 4;
the second optical fiber 4 receives and conducts the linear polarized laser passing through the whole induction device 2, and outputs the linear polarized laser to a system at the rear end for measuring lightning current;
A laser power detector 14 for receiving the linearly polarized laser light output from the second optical fiber 4 and generating a corresponding current output;
The transimpedance amplifying circuit 15 converts the current output by the laser power detector 14 into analog voltage and amplifies the analog voltage to a size convenient for measurement;
The analog-to-digital conversion circuit 16 converts the analog voltage signal output by the transimpedance amplification circuit 15 into a digital signal for calculation;
the programmable logic device 11 is used for high-speed data calculation and processing to obtain a processing result, wherein the processing result can be a lightning current waveform or related parameter data of the lightning current;
And the output network port circuit 17 outputs the processing result of the lightning current signal acquisition and processing system to a remote data application unit.
The operation measurement process of the whole optical lightning current measurement system is as follows:
the programmable logic device 11 sends an instruction to the laser power control circuit 12, so that the laser power control circuit 12 controls and drives the polarization maintaining laser 13 to output stable linear polarization laser, and the polarization direction of the linear polarization laser is consistent with the fast axis direction of the first optical fiber 3;
the linear polarization laser output by the polarization-preserving laser 13 is input to a first collimator 21 of the sensing device 2 through a first optical fiber 3, becomes parallel linear polarization light output through the first collimator 21, and effectively enters a polarizer 22;
The polarization direction of the polarizer 22 is consistent with the fast axis direction of the first optical fiber 3, and linearly polarized light enters the magneto-optical crystal 23;
When the linear polarized laser light passes through the magneto-optical crystal 23, the polarization direction of the linear polarized laser light rotates a certain angle under the action of a magnetic field generated by lightning current;
the parallel linear polarized light with the rotated polarization direction passes through the analyzer 24, an included angle of 45 degrees is formed between the polarization direction of the analyzer 24 and the polarization direction of the polarizer 22, and when the included angle between the polarization direction of the parallel linear polarized light after rotation under the action of a magnetic field and the polarization direction of the analyzer 24 is smaller than 45 degrees, the light power can be increased; when the included angle between the polarization direction of the parallel polarized light rotated under the action of the magnetic field and the polarization direction of the analyzer 24 is greater than 45 degrees, the optical power becomes smaller; the light power of the linearly polarized laser light transmitted at this time can reflect the magnitude of the lightning current that generates the magnetic field applied to the magneto-optical crystal 23;
The light beam passing through the analyzer 24 passes through a second collimator 25, is coupled into a second optical fiber 4, and is conducted and output to the laser power detector 14;
The laser power detector 14 converts the optical power into current, the weak current is converted into voltage through the transimpedance amplifying circuit 15 and amplified to a measurable level, the analog voltage signal is converted into a digital signal through the analog-to-digital converting circuit 16 and is input into the programmable logic device 11, and the information such as lightning current parameters, waveforms and the like is output to an application unit at the rear end through the output network port circuit 17 through high-speed calculation and processing of the programmable logic device 11.
In the above two embodiments, the first optical fiber 3 and the second optical fiber 4 are polarization maintaining fibers, and may be panda type polarization maintaining fibers, elliptic type polarization maintaining fibers, bow tie type polarization maintaining fibers or other polarization maintaining fibers.
The magneto-optical crystal 23 may be a magneto-optical crystal material having faraday effect, which is paramagnetic or diamagnetic, such as Yttrium Iron Garnet (YIG), terbium Gallium Garnet (TGG), terbium Aluminum Garnet (TAG), or the like.
The programmable logic device in the signal acquisition processing device can be a field programmable gate array (Field Programmable GATE ARRAY, abbreviated as FPGA) or other types of devices, and those skilled in the art can select the programmable logic device according to actual needs.
The invention has been described in detail with reference to specific embodiments thereof, which are merely preferred embodiments of the invention and are not intended to limit the invention thereto. Equivalent substitutions and modifications will occur to those skilled in the art without departing from the principles of the present invention, and these should be considered to be within the scope of the present invention as defined by the appended claims.
Claims (5)
1. An optical lightning current measurement system, comprising:
the signal acquisition processing device comprises a programmable logic device, a laser power control circuit, a polarization-maintaining laser, a laser power detector, a transimpedance amplifying circuit, an analog-to-digital conversion circuit and an output network port circuit, wherein the laser power control circuit receives an instruction sent by the programmable logic device and controls the polarization-maintaining laser to output stable linear polarization laser, the output end of the laser power detector is connected with the input end of the transimpedance amplifying circuit, the output end of the transimpedance amplifying circuit is connected with the input end of the analog-to-digital conversion circuit, the output end of the analog-to-digital conversion circuit is connected with the input end of the programmable logic device, and the programmable logic device is connected with the output network port circuit;
the sensing device comprises a first collimator, a polarizer, a magneto-optical crystal, an analyzer and a second collimator, wherein the linearly polarized laser output by the polarization-preserving laser sequentially passes through the first collimator, the polarizer, the magneto-optical crystal, the analyzer and the second collimator and then reaches the laser power detector;
the first optical fiber is connected with the polarization maintaining laser and the first collimator and is used for receiving the linear polarization laser output by the polarization maintaining laser and outputting the linear polarization laser to the first collimator, the polarization direction of the linear polarization laser output by the polarization maintaining laser is consistent with the fast axis direction of the first optical fiber, and the polarization direction of the polarizer is consistent with the fast axis direction of the first optical fiber;
The second optical fiber is connected with the second collimator and the laser power detector and is used for receiving the linear polarized laser output by the second collimator and outputting the linear polarized laser to the laser power detector, the polarization direction of the analyzer is consistent with the fast axis direction of the second optical fiber, an included angle of 45 degrees is formed between the polarization direction of the analyzer and the polarization direction of the polarizer, and an included angle of 45 degrees is formed between the fast axis direction of the first optical fiber and the fast axis direction of the second optical fiber;
The calculation formula of the rotation angle θ of the linearly polarized light is as follows:
θ＝VBd
Wherein V is the Wilde constant, is the inherent proportionality coefficient of the substance, B is the strength of the magnetic field, and d is the length of the magneto-optical crystal;
the magnetic field strength B is calculated from the biot-savart law as follows:
Wherein u 0 is vacuum magnetic permeability, r 0 is distance between the magneto-optical crystal and the center of the lightning-induced wire, and θ 1 and θ 2 are included angles between two endpoints of the lightning-induced wire acting part and connecting line of the magneto-optical crystal and the lightning-induced wire respectively.
2. The optical lightning current measurement system according to claim 1, wherein the first optical fiber is a panda-type polarization maintaining optical fiber or an elliptic polarization maintaining optical fiber or a bow tie type polarization maintaining optical fiber, and the second optical fiber is a panda-type polarization maintaining optical fiber or an elliptic polarization maintaining optical fiber or a bow tie type polarization maintaining optical fiber.
3. The optical lightning current measurement system according to claim 1, wherein the input of the first collimator is linear polarized laser light output by the first optical fiber and the output is parallel polarized laser light.
4. The optical lightning current measurement system according to claim 1, wherein the magneto-optical crystal is yttrium iron garnet or terbium gallium garnet or terbium aluminum garnet.
5. An optical lightning current measuring method using the optical lightning current measuring system of claim 1, characterized in that,
A programmable logic device is utilized to send out an instruction to a laser power control circuit;
The laser power control circuit performs closed-loop control on optical power and temperature, and controls the polarization-preserving laser to output stable linear polarized laser, and the linear polarized laser is transmitted to the sensing device through the first optical fiber;
receiving the linear polarized laser output by the induction device by using a laser power detector, and converting the optical power into an analog current signal;
converting an analog current signal output by the laser power detector into an analog voltage signal by using a transimpedance amplification circuit and amplifying the analog voltage signal;
Converting an analog voltage signal output by the transimpedance amplifying circuit into a digital signal by utilizing an analog-to-digital conversion circuit;
calculating the digital signals output by the analog-to-digital conversion circuit by using a programmable logic device to obtain lightning current parameters and lightning current waveforms;
And outputting the lightning current parameters and the lightning current waveforms to the far end by using an output network port circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910922465.5A CN112578173B (en) | 2019-09-27 | 2019-09-27 | Optical lightning current measuring system and measuring method |
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| CN201910922465.5A CN112578173B (en) | 2019-09-27 | 2019-09-27 | Optical lightning current measuring system and measuring method |
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