CN110596471A - Optical direct-current strong electric field measuring system and method - Google Patents
Optical direct-current strong electric field measuring system and method Download PDFInfo
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- CN110596471A CN110596471A CN201910882149.XA CN201910882149A CN110596471A CN 110596471 A CN110596471 A CN 110596471A CN 201910882149 A CN201910882149 A CN 201910882149A CN 110596471 A CN110596471 A CN 110596471A
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Abstract
The invention discloses an optical direct current strong electric field measuring system, which is characterized in that: the device comprises a laser light source, a direct current electric field sensor and a photoelectric detector which are connected in sequence, and further comprises a signal display and processing system, wherein the signal display and processing system is connected with the direct current electric field sensor and the photoelectric detector. The invention uses the rotary shielding sheet to carry out chopping modulation on the external direct current electric field, thereby solving the problem that the electro-optic crystal cannot directly measure the direct current electric field; the electro-optical crystal is used for measuring the electric field signal, the measurement precision is high, the measurement range is large, and the accurate measurement of a direct current strong electric field of 5-100kV/m is realized; the optical fiber is adopted for signal transmission, photoelectric isolation of a transmission system is realized, and the sensor has strong anti-electromagnetic interference capability and is suitable for occasions with complicated electromagnetic environments; the sensor can be further used for measuring an alternating current and direct current mixed electric field.
Description
Technical Field
The invention relates to the technical field of power detection, in particular to an optical direct-current strong electric field measuring system and method.
Background
In recent years, with the construction of extra-high voltage direct current transmission engineering and the enhancement of social environmental awareness, electromagnetic environment becomes a restrictive factor for determining the structure of a high voltage line and the arrangement of corridors, wherein the problem of a ground synthetic electric field of a direct current transmission line is a key concern of environmental protection departments and people. The traditional direct current electric field sensor is based on a charge induction principle, has low measurement precision and small measurement range, is easily interfered by a strong electromagnetic environment, and can not meet the requirement of direct current electric field measurement of an extra-high voltage direct current transmission project. Therefore, in order to meet the requirement of environmental protection, reasonably design the line structure and the corridor arrangement and reduce the potential hazard brought by the electromagnetic environment, the patent provides an optical direct-current strong electric field measuring system and method, so that the accurate measurement of the ground synthetic electric field intensity of the direct-current transmission line is realized, and the important practical significance is achieved.
Disclosure of Invention
In view of the above, one of the objectives of the present invention is to provide an optical dc strong electric field measurement system with the characteristics of high sensitivity, wide measurement range and strong anti-electromagnetic interference capability, and the other objective is to provide a measurement method based on the device.
The purpose of the invention is realized by the following technical scheme:
the optical direct-current strong electric field measuring system comprises a laser light source, a direct-current electric field sensor and a photoelectric detector which are sequentially connected, and further comprises a signal display and processing system, wherein the signal display and processing system is connected with the direct-current electric field sensor and the photoelectric detector.
Further, the direct current electric field sensor comprises a shielding shell and a rotary shielding sheet arranged at the top end of the shielding shell, and an electro-optical sensing module is arranged in a space defined by the rotary shielding sheet and the shielding shell.
Furthermore, the electro-optical sensing module comprises an input end optical fiber collimating mirror, a polarizer, a quarter wave plate, an electro-optical crystal, an analyzer and an output end optical fiber collimating mirror which are sequentially arranged along the laser transmission direction.
Further, the direct current electric field sensor also comprises a photoelectric coded disc positioned outside the shielding shell and a rotating motor connected with the photoelectric coded disc and the rotating shielding sheet.
Furthermore, a crystal light-passing surface of the electro-optical crystal is plated with a 1550nm laser antireflection film.
Further, the input end of the input end fiber collimating mirror is connected with the output end of the laser light source through a single mode fiber; and the output end of the output end optical fiber collimating mirror is connected with the input end of the photoelectric detector through a multimode optical fiber.
An optical direct current strong electric field measuring method based on an optical direct current strong electric field measuring system is specifically as follows:
s1: the laser light source inputs 1550nm laser to the input end of the direct current electric field sensor through a single-mode optical fiber;
s2: the rotating shielding plate of the electric field sensor is driven by a motor to rotate at a constant speed, and blades on the shielding plate periodically modulate an external direct current electric field;
s3: an electro-optical sensing module of the electric field sensor measures the modulated electric field signal, and a light intensity signal of the electric field sensor is transmitted to a photoelectric detector through a multimode optical fiber;
s4: the photoelectric detector converts the light intensity signal into a voltage signal;
s5: and the terminal signal display processing system detects the effective value of the voltage signal to acquire the strength of the direct current electric field to be detected.
Further, in S3, the relationship between the output intensity of the electro-optical sensing module and the intensity of the applied electric field can be obtained by the following formula:
wherein E is the applied electric field strength, EπHalf-wave electric field for electro-optical sensor module, IinFor input of light intensity, IoutTo output light intensity.
Further, in S4, the voltage signal output by the photodetector after obtaining the light intensity signal of the dc electric field sensor may be represented by the following formula:
wherein, VoutFor the photodetector output voltage, EdcThe intensity of external direct current electric field, L is the length of the electro-optic crystal, h is the radial distance between the electro-optic crystal and the center of the shielding disc, omega is the angular speed of the rotation of the shielding plate, and k1Is the DC component of the output, k2Is a scaling factor.
Further, in S5, the end signal display processing system measures the effective value of the voltage signal output by the photodetector, and obtains the external dc electric field strength by the following formula:
Voutrms＝-2.947+1.879Edc
wherein the effective value V of the output voltageoutrmsIn mV, and an external DC electric field EdcThe unit of (b) is kV/m.
The invention has the beneficial effects that:
1. the external direct current electric field is chopped and modulated by using the rotary shielding sheet, so that the problem that the direct current electric field cannot be directly measured by the electro-optic crystal is solved;
2. the electro-optical crystal is used for measuring the electric field signal, the measurement precision is high, the measurement range is large, and the accurate measurement of a direct current strong electric field of 5-100kV/m is realized;
3. the optical fiber is adopted for signal transmission, photoelectric isolation of a transmission system is realized, and the sensor has strong anti-electromagnetic interference capability and is suitable for occasions with complicated electromagnetic environments;
4. the sensor can be further used for measuring an alternating current and direct current mixed electric field.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
The embodiment provides an optical direct-current strong electric field measurement system, as shown in fig. 1, which includes a laser light source 1, a direct-current electric field sensor 3, and a photodetector 5, which are connected in sequence, and further includes a signal display and processing system 8, where the signal display and processing system 8 is connected to both the direct-current electric field sensor 3 and the photodetector 5.
The direct current electric field sensor 3 comprises a shielding shell 33 and a rotary shielding sheet 32 arranged at the top end of the shielding shell 33, and the electro-optical sensing module 31 is arranged in a space surrounded by the rotary shielding sheet 32 and the shielding shell 33. The electro-optical sensing module 31 is responsible for detecting the electric field signal modulated by the shielding sheet. The electro-optical sensing module 31 includes an input end fiber collimating mirror 311, a polarizer 312, a quarter wave plate 313, an electro-optical crystal 314, an analyzer 315, and an output end fiber collimating mirror 316, which are sequentially arranged along the transmission direction of laser light, wherein the electro-optical crystal 314 is LiNbO3Crystal and 1550nm laser antireflection film coated on the light passing surface of the crystal.
The dc electric field sensor 3 further includes a photoelectric encoder 35 located outside the shield case 33 and a rotary motor 34 connected to both the photoelectric encoder 35 and the rotary shield plate 32. The rotary shielding plate 32 is driven by the rotary motor 34 to rotate at a constant speed and be reliably grounded, so as to modulate the external direct current electric field; the photoelectric coded disc 35 rotates at a constant speed under the driving of the rotating motor 34 to detect the rotating phase of the rotating shielding sheet 32; the electro-optical sensing module 1 measures the modulated direct current electric field signal, and the input end, i.e. the input end, of the electro-optical sensing module 1 is connected with the laser light source 1 through the single-mode fiber 2, and the output end, i.e. the output end, of the electro-optical sensing module 316 is connected with the photoelectric detector 5 through the multimode fiber 4. The embodiment of the device is as follows:
the laser source 1 emits 1550nm laser, the laser is sent into the input end of the direct current electric field sensor 3 through the single mode optical fiber 2, the direct current electric field sensor 3 modulates and detects an external direct current electric field, an output optical signal is sent into the photoelectric detector 5 through the multimode optical fiber 4 to be converted into an electric signal, and then the photoelectric coded disc 5 and the photoelectric detector signal are sent into the signal display and processing system 8 at the tail end through the coaxial cable I6 and the coaxial cable II7 to obtain the intensity of the detected direct current electric field.
The embodiment also provides an optical direct-current strong electric field measurement method based on the system, and the measurement method specifically comprises the following steps:
s1: the laser light source inputs 1550nm laser to the input end of the direct current electric field sensor through a single-mode optical fiber;
s2: the rotating shielding plate of the electric field sensor is driven by a motor to rotate at a constant speed, and blades on the shielding plate periodically modulate an external direct current electric field;
s3: an electro-optical sensing module of the electric field sensor measures the modulated electric field signal, and a light intensity signal of the electric field sensor is transmitted to a photoelectric detector through a multimode optical fiber;
the relationship between the output light intensity of the electro-optical sensing module and the intensity of the applied electric field can be obtained by the following formula:
wherein E is the applied electric field strength, EπHalf-wave electric field for electro-optical sensor module, IinFor input of light intensity, IoutTo output light intensity.
S4: the photoelectric detector converts the light intensity signal into a voltage signal;
the voltage signal output by the photodetector after obtaining the light intensity signal of the dc electric field sensor can be represented by the following formula:
wherein, VoutFor the photodetector output voltage, EdcThe intensity of external direct current electric field, L is the length of the electro-optic crystal, h is the radial distance between the electro-optic crystal and the center of the shielding disc, omega is the angular speed of the rotation of the shielding plate, and k1Is the DC component of the output, k2Is a scaling factor.
S5: and the terminal signal display processing system detects the effective value of the voltage signal to acquire the strength of the direct current electric field to be detected.
The terminal signal display processing system measures the effective value of the voltage signal output by the photoelectric detector, and obtains the external direct current electric field intensity through the following formula:
Voutrms＝-2.947+1.879Edc
wherein the effective value V of the output voltageoutrmsIn mV, and an external DC electric field EdcThe unit of (b) is kV/m.
The system and the method of the invention actually meet the requirement of measuring a direct current electric field of 5-100kV/m, and the linear fitting goodness of the system and the method reaches 0.998.
Compared with the prior art, the invention has the following advantages:
1. the external direct current electric field is chopped and modulated by using the rotary shielding sheet, so that the problem that the direct current electric field cannot be directly measured by the electro-optic crystal is solved;
2. the electro-optical crystal is used for measuring the electric field signal, the measurement precision is high, the measurement range is large, and the accurate measurement of a direct current strong electric field of 5-100kV/m is realized;
3. and optical fibers are adopted for signal transmission, so that photoelectric isolation of a transmission system is realized. The sensor has stronger anti-electromagnetic interference capability and can be suitable for occasions with more complex electromagnetic environment;
4. the sensor can be further used for measuring an alternating current and direct current mixed electric field.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. An optical direct current strong electric field measuring system is characterized in that: the device comprises a laser light source, a direct current electric field sensor and a photoelectric detector which are connected in sequence, and further comprises a signal display and processing system, wherein the signal display and processing system is connected with the direct current electric field sensor and the photoelectric detector.
2. An optical direct current strong electric field measuring system according to claim 1, characterized in that: the direct current electric field sensor comprises a shielding shell and a rotary shielding sheet arranged at the top end of the shielding shell, and an electro-optical sensing module is arranged in a space defined by the rotary shielding sheet and the shielding shell.
3. An optical direct current strong electric field measuring system according to claim 2, characterized in that: the electro-optical sensing module comprises an input end optical fiber collimating mirror, a polarizer, a quarter wave plate, an electro-optical crystal, an analyzer and an output end optical fiber collimating mirror which are sequentially arranged along the transmission direction of laser.
4. An optical direct current strong electric field measuring system according to claim 3, characterized in that: the direct current electric field sensor also comprises a photoelectric coded disc positioned outside the shielding shell and a rotating motor connected with the photoelectric coded disc and the rotating shielding sheet.
5. An optical direct current strong electric field measuring system according to claim 3, characterized in that: the crystal light-passing surface of the electro-optical crystal is plated with a 1550nm laser antireflection film.
6. An optical direct current strong electric field measuring system according to claim 3, characterized in that: the input end of the input end optical fiber collimating mirror is connected with the output end of the laser light source through a single mode optical fiber; and the output end of the output end optical fiber collimating mirror is connected with the input end of the photoelectric detector through a multimode optical fiber.
7. An optical direct current strong electric field measuring method based on an optical direct current strong electric field measuring system according to any one of claims 1 to 6, characterized in that: the measuring method specifically comprises the following steps:
s1: the laser light source inputs 1550nm laser to the input end of the direct current electric field sensor through a single-mode optical fiber;
s2: the rotating shielding plate of the electric field sensor is driven by a motor to rotate at a constant speed, and blades on the shielding plate periodically modulate an external direct current electric field;
s3: an electro-optical sensing module of the electric field sensor measures the modulated electric field signal, and a light intensity signal of the electric field sensor is transmitted to a photoelectric detector through a multimode optical fiber;
s4: the photoelectric detector converts the light intensity signal into a voltage signal;
s5: and the terminal signal display processing system detects the effective value of the voltage signal to acquire the strength of the direct current electric field to be detected.
8. An optical direct current strong electric field measuring method according to claim 7, characterized in that: in S3, the relationship between the output intensity of the electro-optical sensing module and the intensity of the applied electric field can be obtained by the following formula:
wherein E is the applied electric field strength, EπHalf-wave electric field for electro-optical sensor module, IinFor input of light intensity, IoutTo output light intensity.
9. An optical direct current strong electric field measuring method according to claim 7, characterized in that: in S4, the voltage signal output by the photodetector after obtaining the light intensity signal of the dc electric field sensor can be represented by the following formula:
wherein, VoutFor the photodetector output voltage, EdcThe intensity of external direct current electric field, L is the length of the electro-optic crystal, h is the radial distance between the electro-optic crystal and the center of the shielding disc, omega is the angular speed of the rotation of the shielding plate, and k1Is the DC component of the output, k2Is a scaling factor.
10. An optical direct current strong electric field measuring method according to claim 7, characterized in that: in S5, the end signal display processing system measures an effective value of the voltage signal output by the photodetector, and obtains the external dc electric field strength by the following formula:
Voutrms＝-2.947+1.879Edc
wherein the effective value V of the output voltageoutrmsIn mV, and an external DC electric field EdcThe unit of (b) is kV/m.
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