CN117804633A - Distributed optical fiber temperature measuring device for electric penetration piece of nuclear power plant - Google Patents
Distributed optical fiber temperature measuring device for electric penetration piece of nuclear power plant Download PDFInfo
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- 230000035515 penetration Effects 0.000 title claims abstract description 65
- 239000013307 optical fiber Substances 0.000 title claims abstract description 58
- 238000012545 processing Methods 0.000 claims abstract description 25
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 15
- 238000012544 monitoring process Methods 0.000 claims abstract description 15
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/324—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Raman scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/017—Inspection or maintenance of pipe-lines or tubes in nuclear installations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The application relates to a distributed optical fiber temperature measuring device for an electric penetration piece of a nuclear power plant, which comprises: the device comprises an optical path module, a signal processing module and an early warning module. According to the distributed optical fiber temperature measuring device for the electric penetration piece of the nuclear power plant, in the actual monitoring process, high-power short-pulse laser generated by the pulse laser enters the temperature measuring optical fiber after passing through the wavelength division multiplexer, stokes signal light and anti-stokes signal light are respectively converted into electric signals through the two photoelectric converters and transmitted to the processor, the temperature value of each point in the temperature measuring optical fiber is calculated by the processor, when the temperature monitored by the processor is higher than the safety threshold of the early warning module, the early warning module gives an alarm, so that more accurate temperature measurement can be carried out through the distributed optical fiber, early warning can be carried out through the early warning module according to the safety threshold, and therefore, the early warning area can be overhauled according to the early warning signal before the damage of the electric penetration piece of the nuclear power plant affects the operation of the nuclear power plant, and the accident rate of the nuclear power plant is reduced.
Description
Technical Field
The application relates to the technical field of nuclear power plant equipment monitoring, in particular to a distributed optical fiber temperature measuring device for an electric penetration piece of a nuclear power plant.
Background
The nuclear power plant electric penetration assembly is used as special electric equipment for medium-voltage power, low-voltage power, instrument control and coaxial cable in the nuclear power plant to penetrate through the inner side and the outer side of the containment, and has the main functions of maintaining electric energy transmission and signal transmission of the electric equipment, ensuring the integrity of the pressure boundary of the reactor under normal working conditions and accident working conditions and preventing radioactive substances in the reactor from leaking outwards. At present, the electrical penetration pieces of the nuclear power plant used in the nuclear power plant all adopt organic materials to realize the insulation sealing function, but the working conditions of oxygen content and high temperature and high irradiation bring failure aging risks to the materials.
Because the physical structure of the electric penetration piece of the nuclear power plant has strict air tightness requirement, heat generated by the operation of the electric penetration piece of the nuclear power plant is accumulated in the cylinder body, and the phenomena of insulation degradation, aging and cracking of an internal organic insulating material are easily caused, so that the electric connection performance and the mechanical supporting performance of the electric penetration piece of the nuclear power plant are influenced. In combination with the requirements of environmental conditions such as high temperature, high humidity, compact space and the like and electrical connectivity of the electrical penetration assembly of the nuclear power plant, the electrical safety factors, the operation tolerance and the biological shielding performance are considered, and innovative design and performance improvement related to temperature monitoring are required to be developed aiming at the long-term operation state of the electrical penetration assembly of the nuclear power plant.
In the prior art, the temperature monitoring technology for the electric penetration assembly of the nuclear power plant mainly carries out multipoint temperature measurement through supporting double insulation K-type thermocouples, however, the sensitivity of a thermocouple sensor is very low, and signals of an external environment easily interfere the thermocouple sensor. At the same time, the thermocouple sensor is also very easily affected by the temperature drift of the preamplifier, so that the thermocouple sensor is not suitable for being used for measuring tiny temperature changes in plants or parts with high safety measurement requirements of a nuclear power plant.
Disclosure of Invention
Based on this, it is necessary to perform multipoint temperature measurement mainly by supporting double insulation type K thermocouples in the prior art for the temperature monitoring technology for the electrical penetration assembly of the nuclear power plant, however, the sensitivity of the thermocouple sensor is very low, and signals of the external environment easily interfere with the thermocouple sensor. Meanwhile, the thermocouple sensor is also very easily influenced by the temperature drift of the preamplifier, so that the thermocouple sensor is not suitable for being used for the problem that a factory building or a part with high safety measurement requirements of a nuclear power plant measures very small temperature change, and the distributed optical fiber temperature measuring device for the electric penetration piece of the nuclear power plant is provided.
A distributed optical fiber temperature measuring device for an electrical penetration of a nuclear power plant for monitoring temperatures of various portions of the electrical penetration of the nuclear power plant, the distributed optical fiber temperature measuring device for the electrical penetration of the nuclear power plant comprising: the system comprises an optical path module, a signal processing module and an early warning module;
the optical path module comprises a pulse laser, a wavelength division multiplexer, a temperature measuring optical fiber and a photoelectric converter; the signal processing module comprises a processor;
the output end of the pulse laser is connected with the wavelength division multiplexer, the wavelength division multiplexer is provided with a first output end and a second output end, and the first output end is connected with the temperature measuring optical fiber;
one end of the temperature measuring optical fiber connected with the output end of the wavelength division multiplexer is arranged in a calibration area in the constant temperature tank, and the other end of the temperature measuring optical fiber is arranged at the temperature to be measured of the electric penetration piece of the nuclear power plant;
the two photoelectric converters are arranged, the second output ends are respectively connected with the two photoelectric converters, the output ends of the photoelectric converters are connected with the processor, the processor determines a first temperature value based on signal light data acquired by the two photoelectric converters, and the first temperature value is a temperature value of each point in the temperature measuring optical fiber;
the processor is connected with the early warning module, and the early warning module determines whether to send an early warning signal or not based on the first temperature value and a safety threshold preset by the early warning module.
In an embodiment, the electrical penetration of the nuclear power plant comprises a barrel and a feedthrough, the feedthrough is threaded through the barrel, and the safety threshold comprises a first threshold, a second threshold and a third threshold; the safety threshold corresponding to the temperature of the outer surface of the end part of the cylinder body is the first threshold; the safety threshold corresponding to the temperature of the end portion of the feed-through wire is the second threshold; the safety threshold corresponding to the internal temperature of the cylinder is the third threshold.
In one embodiment, the first threshold is 10-25 ℃; the second threshold is 25-35 ℃; the third threshold is 65-75 ℃.
In an embodiment, the distributed optical fiber temperature measuring device for the electric penetration piece of the nuclear power plant further comprises an observation module and an operation module, wherein the observation module and the early warning module are connected with the operation module;
the observation module is connected with the electric penetration piece of the nuclear power plant and used for sending an observation signal to the operation module, and the observation signal is used for reflecting the damage condition of the electric penetration piece of the nuclear power plant;
and when the first temperature value is higher than the safety threshold value, the early warning module sends an early warning signal to the operation module, and the early warning signal is used for indicating the operation module to send out an alarm signal when receiving the early warning signal.
In an embodiment, the observation module is one or more of a photographic image collector, an infrared image collector, an acoustic emission sensor, an ultrasonic sensor, and a fiber optic strain sensor.
In one embodiment, the pulse laser emitted by the pulse laser has a central wavelength of 1550nm, a peak power adjustable range of 20W-30W, a pulse width adjustable range of 10 ns-1000 ns and a pulse repetition frequency adjustable range of 10 Hz-100 kHz.
In one embodiment, the wavelength division multiplexer has three bandpass filters, which are respectively: a first bandpass filter through which raman anti-stokes scattered light having a center wavelength of 1450nm can pass, a second bandpass filter through which raman stokes scattered light having a center wavelength of 1660nm can pass, and a third bandpass filter through which incident pulsed laser light having a center wavelength of 1550nm can pass.
In an embodiment, the light transmission range of the first bandpass filter is 1445 nm-1475 nm; the light transmission range of the second band-pass filter is 1645 nm-1680 nm; the light transmission range of the third band-pass filter is 1535 nm-1565 nm.
In one embodiment, the photoelectric converter is an InGaAs avalanche diode, the response bandwidth of which is 150MHz, and the response wavelength of which is in the range of 900nm to 1700nm.
In one embodiment, the temperature measuring optical fiber is a high thermal conductivity type sensing multimode optical fiber with the diameter of 62.5 mu m.
In an embodiment, the signal processing module includes a high-speed ADC acquisition card for acquiring the voltage signal transmitted from the photoelectric converter, and the processor is connected to the high-speed ADC acquisition card and is used for sampling and data processing the voltage signal transmitted from the high-speed ADC acquisition card.
In the above-mentioned distributed optical fiber temperature measuring device for electric penetration piece of nuclear power plant, in actual monitoring process, the high-power short pulse laser that pulse laser produced gets into temperature measurement optic fibre after passing through wavelength division multiplexer and takes place backward raman scattering light in temperature measurement optic fibre, backward raman scattering light primary road returns in the wavelength division multiplexer and will backward raman scattering light in stokes light and anti-stokes light extract, and absorb and convert two kinds of signal light into the signal light through two photoelectric converters respectively and transmit to the treater, the treater is through gathering two kinds of signal light data and through calculating the light intensity of these two kinds of signal light and then call out the temperature value of each point in the temperature measurement optic fibre, the treater is connected with early warning module, when the temperature value that the treater was demodulated is higher than the safe threshold of early warning module, the treater control module is reported to the police, thereby can carry out more accurate temperature measurement through distributed optic fibre, and carry out early warning according to the safe threshold through early warning module, thereby can carry out the maintenance according to early warning signal before the electric penetration piece of nuclear power plant's operation, thereby the nuclear power plant accident rate has been reduced.
Drawings
FIG. 1 is a schematic diagram of a distributed fiber optic temperature measurement device for an electrical penetration of a nuclear power plant according to one embodiment.
FIG. 2 is a schematic diagram of a distributed fiber optic temperature measurement device for an electrical penetration of a nuclear power plant according to one embodiment.
Reference numerals illustrate:
100-a distributed optical fiber temperature measuring device for an electric penetration piece of a nuclear power plant;
110-an optical path module; a 111-pulse laser; 112-wavelength division multiplexer; 113-temperature measuring optical fiber; 114-a coupler; 115-beam splitters;
120-a signal processing module; a 121-photoelectric converter; 122-a processor; 123-high speed ADC acquisition card; 124-an amplifying circuit; 125-a driving circuit;
130-an early warning module; 131-an observation module; 132-an operation module.
Detailed Description
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.
In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms refer to the orientation or positional relationship based on the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.
In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a distributed optical fiber temperature measuring device 100 for an electrical penetration assembly of a nuclear power plant according to an embodiment of the present application, configured to monitor temperatures of various portions of the electrical penetration assembly of the nuclear power plant, where the distributed optical fiber temperature measuring device 100 for the electrical penetration assembly of the nuclear power plant according to an embodiment of the present application includes: the device comprises an optical path module 110, a signal processing module 120 and an early warning module 130.
The optical path module 110 includes a pulse laser 111, a wavelength division multiplexer 112, a temperature measurement optical fiber 113, and a photoelectric converter 121. The signal processing module 120 includes a processor 122. The output of the pulse laser 111 is connected to a wavelength division multiplexer 112, the wavelength division multiplexer 112 having a first output and a second output, the first output being connected to a temperature measuring optical fiber 113. One end of the temperature measuring optical fiber 113 connected with the output end of the wavelength division multiplexer 112 is arranged in a calibration area in the constant temperature tank, and the other end is arranged at the temperature to be measured of the electric penetration piece of the nuclear power plant. The photoelectric converters 121 are two, the second output ends are respectively connected with the two photoelectric converters 121, and the output ends of the photoelectric converters 121 are connected with the processor 122.
In the actual monitoring process of the distributed optical fiber temperature measuring device 100 for an electrical penetration assembly of a nuclear power plant, the high-power short-pulse laser generated by the pulse laser 111 enters the temperature measuring optical fiber 113 after passing through the wavelength division multiplexer 112 and generates backward raman scattered light in the temperature measuring optical fiber 113, the backward raman scattered light returns to the wavelength division multiplexer 112 in a front path and extracts stokes light and anti-stokes light in the backward raman scattered light, the two signal lights are respectively absorbed and converted into electric signals through the two photoelectric converters 121 and transmitted to the processor 122, the processor 122 is used for acquiring two signal light data of the two photoelectric converters 121 and calculating the light intensity of the two signal lights to further call out a first temperature value, the first temperature value is a temperature value of each point in the temperature measuring optical fiber 113, and the processor 122 is connected with the early warning module 130.
Preferably, the signal processing module 120 further includes a driving circuit 125, and the processor 122 synchronizes the pulse signal to the pulse laser 111 through the driving circuit 125.
Specifically, the wavelength division multiplexer 112 includes a coupler 114 and an optical splitter 115, and a plurality of laser pulses generated by the pulse laser 111 are coupled by the wavelength division multiplexer 112 and enter the temperature measurement optical fiber 113, so that the light changes frequency and polarization form when transmitted in the optical fiber, and a scattering phenomenon occurs and returns to the incident end of the wavelength division multiplexer 112. And according to the monitored time consumption T for returning the scattered light to the incident end, determining the position information L of the scattering region from the emitting end.
Wherein: c is the propagation speed of light in vacuum; n is the refractive index of the thermometric optical fiber 113. The back scattered light is filtered out by the thin film interference filter, the temperature sensitive Anti-Stokes and temperature insensitive Stokes in the raman scattered light are separated by the light splitter, and the photoelectric converter 121 converts the optical signal into the electrical signal under the irradiation of scattered light.
In an embodiment, the electrical penetration assembly of the nuclear power plant comprises a cylinder and a feed-through wire, the feed-through wire is arranged in the cylinder in a penetrating mode, the safety threshold comprises a first threshold, a second threshold and a third threshold, and the safety threshold corresponding to the outer surface of the end portion of the cylinder is the first threshold. The safety threshold corresponding to the temperature of the end of the feedthrough is a second threshold. The safety threshold corresponding to the temperature inside the cylinder is the third threshold, so that the early warning module 130 is used for carrying out accurate temperature rising early warning before accidents according to the safety threshold of the cylinder and the feed-through wire in the electric penetration piece of the nuclear power plant, and the early warning area can be overhauled according to the early warning signal before the damage of the electric penetration piece of the nuclear power plant affects the operation of the nuclear power plant, so that the accident rate of the nuclear power plant is reduced.
In an embodiment, the first threshold may be in the range of 10-25 ℃; the second threshold may be in the range of 25-35 ℃; the third threshold may be in the range of 65-75 deg.c.
Preferably, the first threshold is set at 15 ℃, the second threshold is set at 30 ℃, and the third threshold is set at 70 ℃.
Specifically, the distributed optical fiber temperature measuring device for the electric penetration piece of the nuclear power plant in the application can be further arranged at other positions of other components of the electric penetration piece of the nuclear power plant or other components connected with the electric penetration piece of the nuclear power plant, and the temperature to be measured of the distributed optical fiber temperature measuring device for the electric penetration piece of the nuclear power plant is not limited.
In an embodiment, the distributed optical fiber temperature measuring device 100 for the electrical penetration of the nuclear power plant further comprises an observation module 131 and an operation module 132, and the observation module 131, the signal processing module 120 and the early warning module 130 are all connected with the operation module 132. The observation module 131 is connected with the electric penetration piece of the nuclear power plant and is used for sending an observation signal to the operation module 132, wherein the observation signal is used for reflecting the damage condition of the electric penetration piece of the nuclear power plant. When the first temperature value is determined to be higher than the safety threshold, the pre-warning module 130 sends a pre-warning signal to the operation module 132, where the pre-warning signal is used to instruct the operation module 132 to send an alarm signal when receiving the pre-warning signal, and the alarm signal is a popup window prompt, a sound, or a light signal appearing on the operation module 132 and is used to alarm through the operation module 132, where the pre-warning signal may also be other signals, such as a vibration signal, and the like, and is not limited herein. The signal processing module 120 sends the temperature value monitoring data of each point in the temperature measuring optical fiber 113 to the operation module 132, and displays the temperature value monitoring data on the operation module 132, so that a monitoring person can observe the temperature monitoring signal, the damage observing signal of the electric penetration piece of the nuclear power plant and the early warning signal through the operation module 132, thereby analyzing the actual condition of the electric penetration piece of the nuclear power plant according to various signals more conveniently, judging whether maintenance is needed, and further improving the monitoring and maintenance efficiency.
Specifically, the operation module 132 is a processing terminal such as a computer, a tablet, etc. for processing and displaying data and signals.
Specifically, the safety threshold may be modified or set by the operation module 132 according to the actual situation.
In an embodiment, the observation module 131 is one or more of a photographic image collector, an infrared image collector, an acoustic emission sensor, an ultrasonic sensor, and a fiber optic strain sensor, that is, the observation signal is one or more of a photographic image, an infrared image, acoustic emission data, ultrasonic data, and strain data. Therefore, the damage signal of the electric penetration piece of the nuclear power plant at the installation position of the observation module 131 can be obtained through the sensor or the collector, and thus, whether maintenance is needed or not can be judged after the damage signal is combined with the temperature signal.
In one embodiment, the pulse laser 111 emits pulse laser light with a center wavelength of 1550nm, a peak power adjustable range of 20W-30W, a pulse width adjustable range of 10 ns-1000 ns, and a pulse repetition frequency adjustable range of 10 Hz-100 kHz.
In one embodiment, the wavelength division multiplexer 112 has three bandpass filters, which are respectively: a first bandpass filter through which raman anti-stokes scattered light having a center wavelength of 1450nm can pass, a second bandpass filter through which raman stokes scattered light having a center wavelength of 1660nm can pass, and a third bandpass filter through which incident pulsed laser light having a center wavelength of 1550nm can pass.
In one embodiment, the light transmission range of the first bandpass filter is 1445 nm-1475 nm. The light transmission range of the second band-pass filter is 1645 nm-1680 nm. The light transmission range of the third band-pass filter is 1535 nm-1565 nm.
In one embodiment, the photoelectric converter 121 is an InGaAs avalanche diode having a response bandwidth of 150MHz and a response wavelength in the range of 900nm to 1700nm.
In one embodiment, the thermometric optical fiber 113 is a high thermal conductivity type sensing multimode optical fiber with a diameter of 62.5 μm.
In an embodiment, the signal processing module 120 includes a ADC acquisition card 123 for acquiring the voltage signal transmitted from the photoelectric converter 121, and the processor 122 is connected to the ADC acquisition card 123 for sampling and data processing the voltage signal transmitted from the ADC acquisition card 123, wherein the processor 122 is an FPGA (Field-Programmable Gate Array, field programmable gate array).
The high-speed ADC acquisition card 123 may also be a dual-channel high-speed a/D converter, and is configured to sample the analog electrical signal output by the avalanche diode, convert the analog electrical signal into a discrete digital signal, amplify the digital signal to a range capable of being effectively acquired through the amplifying circuit 124, and perform accumulated averaging and storage of the sampled data. The accumulated and averaged signal is subjected to wavelet packet decomposition processing in the processor 122, wavelet packet coefficients higher than a threshold value are reserved, and the denoising signal is obtained through inversion conversion. And finally, demodulating and compensating the temperature data by using the built-in algorithm model to obtain the temperature data of the point to be detected.
The distributed optical fiber temperature measuring device 100 for an electrical penetration piece of a nuclear power plant in the above embodiment specifically performs the temperature demodulation process as follows:
the signal processing module 120 controls the pulse laser 111 to emit 10ns pulse laser light at a repetition frequency of 1kHz, where the pulse laser light is incident from the 1550nm port of the wavelength division multiplexer 112 and exits from the COM port of the wavelength division multiplexer 112 into the multimode sensing fiber, where the pulse laser light can perform scattering action with fiber material molecules during the propagation of the multimode sensing fiber, and back scatter raman anti-stokes scattered light and raman stokes scattered light; the raman anti-stokes scattered light and the raman stokes scattered light are both incident from the COM port of the wavelength division multiplexer 112, and the raman anti-stokes scattered light exits from the 1450nm port of the wavelength division multiplexer 112 to enter the photoelectric converter 121; the raman stokes scattered light exits the 1660nm port of the wavelength division multiplexer 112 into the photoelectric converter 121; the photoelectric converters 121 respectively convert the raman anti-stokes light He Laman stokes light received from the wavelength division multiplexer 112 into voltage signals, and amplify the voltage signals by the amplifying circuit 124 to transmit to the signal processing module 120; the high-speed ADC acquisition card 123 of the signal processing module 120 acquires the voltage signal transmitted by the photoelectric converter 121 at the sampling frequency of 100MHz, and transmits the sampling information to the FPGA for processing; the FPGA performs accumulation average and noise reduction treatment on the sampling signals, demodulates the signals, and obtains a temperature distribution curve along the optical fiber; the signal processing module 120 transmits the demodulated temperature information to the operation module 132 for displaying the temperature information. The temperature demodulation is based on the formula:
wherein T is 0 The absolute temperature is initially calibrated; h is a Planck constant; deltav is the amount of frequency shift of the Raman scattered light; k is boltzmann constant; t is the absolute temperature to be measured; i a 、I s The measured raman anti-stokes scattered light intensity and raman stokes scattered light intensity, respectively; according to the raman anti-stokes scattered light and the corresponding relation between the raman stokes scattered light and the temperature, the temperature value of each monitoring point on the temperature measuring optical fiber 113 can be obtained.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples represent only a few embodiments of the present application, which are described in more detail and are not thereby to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (11)
1. A distributed optical fiber temperature measuring device for an electrical penetration of a nuclear power plant for monitoring temperatures of various portions of the electrical penetration of the nuclear power plant, the distributed optical fiber temperature measuring device for the electrical penetration of the nuclear power plant comprising: the system comprises an optical path module, a signal processing module and an early warning module;
the optical path module comprises a pulse laser, a wavelength division multiplexer, a temperature measuring optical fiber and a photoelectric converter;
the signal processing module comprises a processor;
the output end of the pulse laser is connected with the wavelength division multiplexer, the wavelength division multiplexer is provided with a first output end and a second output end, and the first output end is connected with the temperature measuring optical fiber;
one end of the temperature measuring optical fiber connected with the output end of the wavelength division multiplexer is arranged in a calibration area in the constant temperature tank, and the other end of the temperature measuring optical fiber is arranged at the temperature to be measured of the electric penetration piece of the nuclear power plant;
the two photoelectric converters are arranged, the second output ends are respectively connected with the two photoelectric converters, the output ends of the photoelectric converters are connected with the processor, the processor determines a first temperature value based on signal light data acquired by the two photoelectric converters, and the first temperature value is a temperature value of each point in the temperature measuring optical fiber;
the processor is connected with the early warning module, and the early warning module determines whether to send an early warning signal or not based on the first temperature value and a safety threshold preset by the early warning module.
2. The distributed fiber optic temperature measurement device for a nuclear power plant electrical penetration of claim 1, wherein the nuclear power plant electrical penetration comprises a barrel and a feedthrough threaded through the barrel, the safety threshold comprising a first threshold, a second threshold, and a third threshold; the safety threshold corresponding to the temperature of the outer surface of the end part of the cylinder body is the first threshold; the safety threshold corresponding to the temperature of the end portion of the feed-through wire is the second threshold; the safety threshold corresponding to the internal temperature of the cylinder is the third threshold.
3. The distributed fiber optic temperature measurement device for electrical penetrations of a nuclear power plant of claim 2, wherein the first threshold is 10-25 ℃; the second threshold is 25-35 ℃; the third threshold is 65-75 ℃.
4. The distributed fiber temperature measurement device for electrical penetrations of a nuclear power plant of claim 1, further comprising an observation module and an operation module, both the observation module and the early warning module being connected to the operation module;
the observation module is connected with the electric penetration piece of the nuclear power plant and used for sending an observation signal to the operation module, and the observation signal is used for reflecting the damage condition of the electric penetration piece of the nuclear power plant;
and when the first temperature value is higher than the safety threshold value, the early warning module sends an early warning signal to the operation module, and the early warning signal is used for indicating the operation module to send out an alarm signal when receiving the early warning signal.
5. The distributed fiber optic temperature measurement device for electrical penetrations of a nuclear power plant of claim 4, wherein the observation module is one or more of a photographic image collector, an infrared image collector, an acoustic emission sensor, an ultrasonic sensor, and a fiber optic strain sensor.
6. The distributed optical fiber temperature measuring device for electrical penetration assembly of nuclear power plant according to claim 1, wherein the pulse laser emitted by the pulse laser has a central wavelength of 1550nm, a peak power adjustable range of 20-30W, a pulse width adjustable range of 10-1000 ns and a pulse repetition frequency adjustable range of 10 Hz-100 kHz.
7. The distributed optical fiber temperature measuring device for electrical penetration of nuclear power plant according to claim 1, wherein the wavelength division multiplexer has three bandpass filters, which are respectively: a first bandpass filter through which raman anti-stokes scattered light having a center wavelength of 1450nm can pass, a second bandpass filter through which raman stokes scattered light having a center wavelength of 1660nm can pass, and a third bandpass filter through which incident pulsed laser light having a center wavelength of 1550nm can pass.
8. The distributed optical fiber temperature measuring device for electrical penetration assembly of nuclear power plant according to claim 7, wherein the light transmission range of the first band-pass filter is 1445 nm-1475 nm; the light transmission range of the second band-pass filter is 1645 nm-1680 nm; the light transmission range of the third band-pass filter is 1535 nm-1565 nm.
9. The distributed optical fiber temperature measuring device for electrical penetration assembly of nuclear power plant according to claim 1, wherein the photoelectric converter is an InGaAs avalanche diode with a response bandwidth of 150MHz and a response wavelength range of 900 nm-1700 nm.
10. The distributed optical fiber temperature measuring device for electrical penetration of nuclear power plant according to claim 1, wherein the temperature measuring optical fiber is a high thermal conductivity type sensing multimode optical fiber with a diameter of 62.5 μm.
11. The distributed optical fiber temperature measuring device for electrical penetration assembly of nuclear power plant according to claim 1, wherein the signal processing module comprises a high-speed ADC acquisition card for acquiring the voltage signal transmitted by the photoelectric converter, and the processor is connected with the high-speed ADC acquisition card for sampling and data processing the voltage signal transmitted by the high-speed ADC acquisition card.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311847738.7A CN117804633A (en) | 2023-12-29 | 2023-12-29 | Distributed optical fiber temperature measuring device for electric penetration piece of nuclear power plant |
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| CN202311847738.7A CN117804633A (en) | 2023-12-29 | 2023-12-29 | Distributed optical fiber temperature measuring device for electric penetration piece of nuclear power plant |
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