CN106955873B - Laser decontamination online correction auxiliary device, laser decontamination device and decontamination method - Google Patents
Laser decontamination online correction auxiliary device, laser decontamination device and decontamination method Download PDFInfo
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- CN106955873B CN106955873B CN201710328375.4A CN201710328375A CN106955873B CN 106955873 B CN106955873 B CN 106955873B CN 201710328375 A CN201710328375 A CN 201710328375A CN 106955873 B CN106955873 B CN 106955873B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
- B08B7/0042—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like by laser
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
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Abstract
The invention discloses an online laser decontamination correction auxiliary device, a laser decontamination device and a decontamination method, wherein the online correction auxiliary device comprises a shell, a measurement laser output module, a power regulation module, a detection signal collection target surface and a signal extraction processing module, the measurement laser output module, the power regulation module, the detection signal collection target surface and the signal extraction processing module are arranged in the shell, an anti-radiation window is arranged on the shell, measurement laser emitted by the measurement laser output module penetrates through the anti-radiation window, penetrates through the anti-radiation window after the surface of a to-be-decontaminated object is reflected, and is collected on the detection signal collection target surface, the signal extraction processing module extracts a received power signal of the detection signal collection target surface and forwards the received power signal to the power regulation module, and the power regulation module carries out power gain regulation on the measurement laser output module according to the received power signal. The online correction auxiliary device provided by the invention utilizes the power self-gain and narrow-band filtering technology to finish accurate extraction of the ranging signal, and further assists the decontamination device to realize automatic correction on the basis of a preset theoretical track.
Description
Technical Field
The invention relates to the field of laser decontamination, in particular to an online laser decontamination correction auxiliary device, a laser decontamination device and a decontamination method.
Background
During the operation of the nuclear power station, corrosion products of structural materials and primary circuit coolant are activated by neutrons to form radioactive substances which are transmitted, distributed and deposited on the surfaces of pipelines, valves and water pumps of the system. As the service time of the nuclear power plant increases, the radioactive substances are accumulated increasingly, so that the radiation field of the system is enhanced, and the irradiation dose of workers is increased. Therefore, it is necessary to perform radioactive decontamination periodically or aperiodically, to ensure the safe operation of the power station, and to reduce the collective radiation dose of operators. With the large-scale construction and operation of domestic nuclear power plants, more and more parts are needed for radioactive decontamination.
In the prior art, a scheme of using laser for decontamination is proposed preliminarily, but in the existing laser decontamination process, the emission distance of cleaning laser is one of important influence parameters related to decontamination effect, and under the background condition, the following difficulties exist in realizing accurate measurement of the distance: firstly, when laser decontamination is carried out under the radioactive condition, all external interfaces have anti-radiation windows to protect internal devices of the equipment, and the anti-radiation windows can reduce the power fed back to a detection target surface by laser, so that the false alarm rate is greatly improved, and meanwhile, the transmittance of the anti-radiation windows can change along with the absorption of radioactive substances; secondly, the detected surface of the device in the cleaning process has a lot of light interference, including cleaning laser, reflected stray light when the laser and the material act, and the power of the background light is much higher than that of the detection laser. In summary, referring to fig. 1, the laser displacement sensor for trajectory planning in the prior art cannot perform accurate distance measurement in the above environment.
Disclosure of Invention
In view of the foregoing, there is a need to provide an online calibration auxiliary device for laser decontamination, a laser decontamination device and a decontamination method, which utilize power self-gain and narrow-band filtering techniques to complete accurate extraction of ranging signals, so as to assist the decontamination device to implement automatic calibration based on a preset theoretical trajectory. The technical scheme of the invention is as follows:
on one hand, the invention provides an online laser decontamination correction auxiliary device which comprises a shell, a measurement laser output module, a power adjusting module, a detection signal collecting target surface and a signal extracting and processing module, wherein the measurement laser output module, the power adjusting module, the detection signal collecting target surface and the signal extracting and processing module are arranged in the shell, a radiation-resistant window is arranged on the shell, measurement laser emitted by the measurement laser output module penetrates through the radiation-resistant window, penetrates through the radiation-resistant window after being reflected on the surface of a to-be-decontaminated object, and is collected on the detection signal collecting target surface, the signal extracting and processing module extracts a received power signal of the detection signal collecting target surface, performs signal processing, forwards a processing result to the power adjusting module, and the power adjusting module performs power gain adjustment on the measurement laser output module according to the processing result of the received power signal.
Further, the device also comprises a narrow-band filtering module, and the narrow-band filtering module is arranged between the detection signal collecting target surface and the radiation-resistant window.
Further, the center wavelength of the narrow-band filtering module is equal to the measuring laser wavelength of the measuring laser output module.
Further, the measuring laser output module is a blue laser transmitter.
Further, the signal extraction processing module includes a digital filter, and the digital filter is a narrow-band pass filter set for a blue light band.
Further, the radiation-resistant window is made of lead-containing glass or other radiation-resistant light-transmitting materials.
Furthermore, the device is fixedly connected with the cleaning laser emitter, and the area of the surface of the to-be-decontaminated body, which is hit by the cleaning laser emitted by the cleaning laser emitter, coincides with the area of the surface of the to-be-decontaminated body, which is hit by the measuring laser emitted by the measuring laser output module.
In another aspect, the invention provides a laser decontamination device with an online correction function, which comprises a cleaning laser emitter and the above laser decontamination online correction auxiliary device.
In another aspect, the present invention provides a laser decontamination method using the above laser decontamination apparatus, including the following steps:
s1, performing laser ranging by a correction auxiliary device under the condition that a power adjusting module continuously adjusts the power of a measuring laser output module;
s2, according to the target distance and the laser ranging result, performing vertical position correction on the correction auxiliary device until the laser ranging result is consistent with the target distance;
and S3, opening the cleaning laser transmitter to perform laser decontamination.
Further, the method further comprises: and moving the laser decontamination device according to a preset theoretical track, and repeatedly executing the steps S1-S3.
The invention has the following advantages:
a. the laser ranging real-time correction technology in the cleaning process comprises the following steps: the method comprises the following steps of collecting the distance between a laser window and the surface of a member in real time through a laser distance meter during laser decontamination, and realizing automatic correction on the basis of a preset theoretical track;
b. and in the ranging process, a power self-gain and narrow-band filtering technology is adopted, so that the ranging accuracy is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art laser decontamination apparatus;
FIG. 2 is a schematic diagram of a laser decontamination apparatus provided by an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an online calibration auxiliary device for laser decontamination provided by an embodiment of the invention;
FIG. 4 is a schematic diagram of a relationship between theoretical trajectories and trajectories for automatic calibration based on the laser decontamination process provided by an embodiment of the present invention;
fig. 5 is a flow chart of a laser desmear method provided by an embodiment of the invention.
Wherein the reference numerals are: the method comprises the following steps of 1-a shell, 11-an anti-radiation window, 2-a measurement laser output module, 3-a power adjusting module, 4-a detection signal collecting target surface, 5-a signal extracting and processing module, 6-a narrow-band filtering module and 7-a cleaning laser transmitter.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the specific embodiments in the specification. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The laser decontamination online correction auxiliary device provided by the embodiment of the invention can be flexibly installed on the existing laser decontamination equipment, provides accurate distance measurement information for the laser decontamination equipment, improves the decontamination effect of the laser decontamination equipment, is flexible to install, and has a larger market prospect.
Example 1
The power of the laser for detection is low, the laser mostly directly faces to an object to be detected, the power of the laser fed back to a detection target surface can be reduced after the radiation-resistant window is arranged in the middle, the false alarm rate is greatly improved, and meanwhile, the transmittance of the radiation-resistant window can also change along with the absorption of the radioactive substance. With respect to the characteristic that the radiation-resistant window absorbs the detection laser and changes, accurate and stable track information can be obtained only by automatically adjusting the laser power of the laser displacement sensor according to actual conditions, as shown in fig. 4. In one embodiment of the present invention, an auxiliary device for laser decontamination online correction is provided, as shown in fig. 3, and includes a housing 1, a measurement laser output module 2, a power adjustment module 3, a detection signal collection target surface 4, and a signal extraction processing module 5, where the housing 1 is provided with an anti-radiation window 11, and measurement laser emitted by the measurement laser output module 2 passes through the anti-radiation window 11, and after being reflected by a surface of a to-be-decontaminated object, passes through the anti-radiation window 11, and is collected in the detection signal collection target surface 4. Preferably, the radiation-resistant window 11 must meet the radiation-resistant specification, the radiation-resistant window 11 is made of lead-containing glass or other radiation-resistant transparent materials, and the laser output by the laser decontamination online correction assistance device in the embodiment needs to travel to and from the radiation-resistant window and work in a strong optical background.
The power adjusting module 3 realizes power self-gain, which specifically comprises the following steps: the input end of the power adjusting module 3 is connected with the output end of the signal extraction processing module 5, the output end of the power adjusting module is connected with the measurement laser output module 2, the input end of the signal extraction processing module 5 is connected with the detection signal collection target surface 4, and the propagation path of light is as follows: the measurement laser output module 2 emits ranging laser, the ranging laser penetrates out of the casing 1 through the radiation-resistant window 11, reaches the reflection surface, is reflected, reversely penetrates through the radiation-resistant window 11, enters the casing 1, and is finally absorbed by the detection signal collection target surface 4, the signal extraction processing module 5 extracts a reception power signal of the detection signal collection target surface 4, performs signal processing, and forwards a processing result to the power adjustment module 3, and the power adjustment module 3 performs power gain adjustment on the measurement laser output module 2 according to the processing result of the reception power signal, and the specific adjustment method includes: and comparing the received power with an ideal received power value to obtain a power loss difference value, and carrying out corresponding power gain adjustment according to the power loss to keep the received power signal of the detection signal collection target surface 4 in a stable state.
The detected surface of the device in the cleaning process has a plurality of light interferences, including cleaning laser, reflected stray light when the laser and the material act, and the like, and the power of the background light is far higher than that of the detection laser. Aiming at the requirement of extracting weak signals under the strong background, a differential wavelength management technology needs to be introduced to finish accurate extraction of the signals. In a preferred embodiment of the present invention, a wavelength gating technique is adopted, specifically: the laser decontamination online correction auxiliary device further comprises a narrow-band filtering module 6, wherein the narrow-band filtering module 6 is arranged between the detection signal collection target surface 4 and the anti-radiation window 11, and the central wavelength of the narrow-band filtering module 6 is equal to the measuring laser wavelength of the measuring laser output module 2, so that the light rays with other wavelengths can be prevented from passing through the measuring laser to the maximum extent, and the background light interference is effectively shielded.
On the other hand, aiming at the requirement of extracting signals under strong background light interference, the laser cleaning decontamination laser wavelength is mostly 1064nm wave band, and blue laser ranging is adopted to avoid wavelength interference, namely the measurement laser output module 2 is a blue laser transmitter; the signal extraction processing module 5 is provided with a software digital filter, and the software digital filter is a narrow-band-pass filter arranged aiming at a blue light wave band, so that weak signals can be further extracted under a strong background.
Further, the device is fixedly connected with the cleaning laser transmitter, and the area of the surface of the to-be-decontaminated body, which is hit by the cleaning laser transmitted by the cleaning laser transmitter, coincides with the area of the surface of the to-be-decontaminated body, which is hit by the measuring laser transmitted by the measuring laser output module 2.
Example 2
In an embodiment of the present invention, a laser decontamination device with an online calibration function is provided, referring to fig. 2, the laser decontamination device includes a cleaning laser emitter and the above-mentioned online laser decontamination calibration auxiliary device, the cleaning laser emitter is fixedly connected to the online laser decontamination calibration auxiliary device, and a region of the surface of the to-be-decontaminated object, which is irradiated by the cleaning laser emitter, coincides with a region of the surface of the to-be-decontaminated object, which is irradiated by the measurement laser output module 2.
In practical application, the distance from a cleaning laser emitter to a laser decontamination surface needs to be controlled, in the laser decontamination process, the cleaning laser has an optimal emission distance, namely when the distance from the cleaning laser emitter to the laser decontamination surface meets the optimal emission distance, the cleaning laser correspondingly has an optimal decontamination effect, and when the actual distance is smaller than the optimal emission distance, most energy of the laser is consumed by reflection of the laser on the decontamination surface, so that less energy is reserved on the decontamination surface, and the optimal cleaning effect cannot be achieved; when the actual distance is larger than the optimal transmitting distance, the energy of the laser is mainly consumed in the stroke between the transmitter and the decontamination surface, and the residual energy of the cleaning laser is insufficient to achieve the optimal cleaning decontamination effect when the laser reaches the decontamination surface, so that the focal length alignment of the cleaning laser transmitter plays a crucial role in the laser cleaning effect, and the focal length distance of the cleaning laser transmitter is converted into the control of the distance from the cleaning laser transmitter to the laser decontamination surface by the connection of the cleaning laser transmitter and the laser decontamination online correction auxiliary device.
Meanwhile, an embodiment of the present invention provides a laser decontamination method using the laser decontamination apparatus described above, and referring to fig. 5, the method includes the following steps:
s1, a correction auxiliary device carries out laser ranging under the condition that a power adjusting module carries out continuous power adjustment on a measurement laser output module;
s2, according to the target distance and the laser ranging result, performing vertical position correction on the correction auxiliary device until the laser ranging result is consistent with the target distance;
and S3, opening the cleaning laser transmitter to perform laser decontamination.
And in the step S2, when the distance measurement result of the correction assisting device meets the target distance, the cleaning laser correspondingly reaches the optimal emission distance, and then the optimal decontamination effect is achieved.
And (3) executing the steps S1-S3, namely completing the cleaning of one desmutting point, moving the laser decontamination device according to a planned path track, which is shown in figure 4, and repeatedly executing the steps S1-S3, so as to clean and plan the next desmutting point on a preset theoretical track.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes that can be directly or indirectly applied to other related technical fields using the contents of the present specification and the accompanying drawings are included in the scope of the present invention.
Claims (6)
1. A laser decontamination online correction auxiliary device is characterized by comprising:
casing (1), set up in measurement laser output module (2), power adjustment module (3), detection signal in casing (1) collect target surface (4) and signal extraction processing module (5), the device still includes narrowband filtering module (6), be equipped with anti-radiation window (11) on casing (1), narrowband filtering module (6) set up between detection signal collection target surface (4) and anti-radiation window (11), the central wavelength of narrowband filtering module (6) with the measurement laser wavelength of measuring laser output module (2) equals, measurement laser output module (2) are blue laser emitter, the device is used at background optical power and is higher than in the background light of the laser power of measurement laser output module (2), the measurement laser that measurement laser output module (2) launched passes anti-radiation window (11), and pass after waiting to remove the filth reflection anti-radiation window (11), and collect in detection signal collects target surface (4), signal extraction processing module (5) includes digital filter, digital filter is for the narrowband signal extraction processing module (5) the collection target surface (4) of collection, and the processing module (5) includes the receiving signal of bandpass signal: comparing the received power signal with an ideal power value to obtain a power loss difference value, and forwarding a processing result to a power adjusting module (3), wherein the power adjusting module (3) adjusts the power gain of the measurement laser output module (2) according to the processing result of the received power signal, and the method comprises the following steps: and adjusting power gain according to the power loss difference value to keep the received power signal of the detection signal collection target surface (4) in a stable state.
2. The device according to claim 1, characterized in that the radiation-resistant window (11) is made of leaded glass or other radiation-resistant transparent material.
3. The device according to claim 1 or 2, characterized in that the device is fixedly connected with a cleaning laser emitter (7), and the area of the surface to be decontaminated, which is struck by the cleaning laser emitted by the cleaning laser emitter (7), coincides with the area of the surface to be decontaminated, which is struck by the measuring laser emitted by the measuring laser output module (2).
4. A laser decontamination device with an online correction function, which is characterized by comprising a cleaning laser transmitter and the online correction auxiliary device for laser decontamination as claimed in any one of claims 1-3.
5. A laser desmear method using the laser desmear device of claim 4, characterized by the steps of:
s1, a correction auxiliary device carries out laser ranging under the condition that a power adjusting module carries out continuous power adjustment on a measurement laser output module;
s2, according to the target distance and the laser ranging result, performing vertical position correction on the correction auxiliary device until the laser ranging result is consistent with the target distance;
and S3, opening the cleaning laser transmitter to perform laser decontamination.
6. The method of claim 5, further comprising:
and moving the laser decontamination device according to a preset theoretical track, and repeatedly executing the steps S1-S3.
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| CN201710328375.4A CN106955873B (en) | 2017-05-11 | 2017-05-11 | Laser decontamination online correction auxiliary device, laser decontamination device and decontamination method |
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| CN106955873B true CN106955873B (en) | 2023-03-14 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319558A (en) * | 2014-07-22 | 2016-02-10 | 中国科学院光电研究院 | Light-energy stable controller of phase type laser range finding system |
| CN105976885A (en) * | 2016-03-31 | 2016-09-28 | 苏州热工研究院有限公司 | A kind of used in nuclear power station laser decontamination method |
| CN206701862U (en) * | 2017-05-11 | 2017-12-05 | 苏州热工研究院有限公司 | Laser decontamination on-line correction servicing unit and laser decontamination plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9174304B2 (en) * | 2011-10-25 | 2015-11-03 | Eisuke Minehara | Laser decontamination device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105319558A (en) * | 2014-07-22 | 2016-02-10 | 中国科学院光电研究院 | Light-energy stable controller of phase type laser range finding system |
| CN105976885A (en) * | 2016-03-31 | 2016-09-28 | 苏州热工研究院有限公司 | A kind of used in nuclear power station laser decontamination method |
| CN206701862U (en) * | 2017-05-11 | 2017-12-05 | 苏州热工研究院有限公司 | Laser decontamination on-line correction servicing unit and laser decontamination plant |
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