CN112684485B - Optical fiber irradiation monitoring device and method - Google Patents
Optical fiber irradiation monitoring device and method Download PDFInfo
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- CN112684485B CN112684485B CN202110302186.6A CN202110302186A CN112684485B CN 112684485 B CN112684485 B CN 112684485B CN 202110302186 A CN202110302186 A CN 202110302186A CN 112684485 B CN112684485 B CN 112684485B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000012806 monitoring device Methods 0.000 title claims description 19
- 238000005253 cladding Methods 0.000 claims abstract description 123
- 239000000835 fiber Substances 0.000 claims abstract description 119
- 239000002184 metal Substances 0.000 claims abstract description 40
- 238000004806 packaging method and process Methods 0.000 claims abstract description 33
- 238000005538 encapsulation Methods 0.000 claims abstract description 19
- 238000012544 monitoring process Methods 0.000 claims abstract description 16
- 239000006096 absorbing agent Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000004061 bleaching Methods 0.000 claims description 21
- 230000005855 radiation Effects 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 9
- 230000004431 optic radiations Effects 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 230000005251 gamma ray Effects 0.000 description 5
- 239000003292 glue Substances 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
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- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention discloses a device and a method for monitoring optical fiber irradiation, wherein the device for monitoring optical fiber irradiation comprises: a fiber laser, the output power of the signal laser emitted by the fiber laser is not less than 500W, and the beam quality factor M2Less than 1.5; a multimode optical fiber; the cladding light filter is provided with a metal packaging layer in an outer side; a temperature sensor disposed on the metal encapsulation layer; the temperature data processor is connected with the temperature sensor; and, a thermoelectric material absorber; coupling signal laser emitted by the fiber laser to a fiber core of the multimode fiber; the multimode optical fiber is coupled with the cladding light filter, so that signal laser transmitted in the fiber core of the multimode optical fiber is coupled to the cladding light filter and enters the thermoelectric material absorber; the clad light transmitted in the inner cladding of the multimode optical fiber is filtered out to the metal encapsulation layer by the clad light filter. The invention realizes the long-time effective monitoring of the large-dose irradiation environment.
Description
Technical Field
The invention belongs to the technical field of nuclear radiation monitoring, and particularly relates to an optical fiber irradiation monitoring device and method.
Background
The current nuclear detection technology mainly comprises a gas detector, a scintillator detector, a semiconductor detector and an optical fiber detector. The optical fiber detector overcomes the high sensitivity of electronic devices and electric signals to the environment, and the transmission loss of optical signals in the optical fiber is low, so that the optical fiber detector is very suitable for long-distance laying and monitoring.
However, in practical applications, the fiber detector has not been widely popularized yet, and one important reason is that the common radiation-sensitive fiber is not suitable for large-dose radiation detection because the radiation saturation dose is small, for a high-radiation-sensitive fiber (the dose rate is 0.01 Gy/h), the radiation saturation dose is only about 10Gy, and in practical applications, frequent fiber replacement is required, which increases the maintenance cost. However, in order to realize the long-time effective monitoring of the optical fiber irradiation monitoring system on the large-dose irradiation environment, the monitored physical parameters need to have very high irradiation saturation values, so that the conventional optical fiber cannot monitor nuclear detection of large dose and large dose rate due to easy saturation of irradiation, and the development and popularization of an optical fiber detector are seriously hindered.
Therefore, how to realize a high irradiation that can monitor a large dose and a large dose rate by using an optical fiber without a very high irradiation saturation value is a difficult problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned deficiencies or needs in the art, the present invention provides a fiber optic radiation monitoring device and method.
The invention discloses an optical fiber irradiation monitoring device, which comprises:
fiber laser for emitting signal laser, output power of signal laser emitted by the fiber laser being not less than 500W, beam quality factor M2Less than 1.5;
a multimode optical fiber;
the cladding light filter is provided with a metal packaging layer on the outer side;
a temperature sensor disposed at the metal encapsulation layer to measure a temperature of the metal encapsulation layer;
the temperature data processor is connected with the temperature sensor; and the number of the first and second groups,
a thermoelectric material absorber;
the signal laser emitted by the optical fiber laser is coupled to the fiber core of the multimode optical fiber; the multimode optical fiber is coupled with the cladding light filter, so that signal laser transmitted in a fiber core of the multimode optical fiber is coupled to the cladding light filter and is injected into the thermoelectric material absorber; the cladding light transmitted in the inner cladding of the multimode optical fiber is filtered out to the metal encapsulation layer by the cladding light filter.
Optionally, the optical fiber laser further comprises a beam combiner, and the signal laser emitted by the optical fiber laser is coupled to the core of the multimode optical fiber through the beam combiner.
Optionally, the optical fiber further includes a bleaching light source for emitting bleaching light, where the bleaching light emitted from the bleaching light source is coupled to an inner cladding of the multimode optical fiber through the beam combiner, and the inner cladding is sleeved on the outer side of the core.
Optionally, the multimode fiber is a triple-clad fiber, which includes the core, the inner cladding made of fluorine-doped silica, a second cladding and a third cladding, which are sequentially arranged from inside to outside; the refractive index of the fiber core is larger than that of the inner cladding; the refractive index of the inner cladding is greater than that of the second cladding; the second cladding layer has a refractive index less than a refractive index of the third cladding layer.
Optionally, the input fiber and the output fiber of the cladding light filter are both double-clad fibers, the core size of the double-clad fibers is larger than that of the multimode fiber, and the inner cladding size of the double-clad fibers is larger than that of the multimode fiber; and the numerical aperture of the fiber core of the double-clad optical fiber is larger than that of the multimode optical fiber.
Optionally, the metal encapsulation layer is sleeved outside the encapsulated optical fiber of the cladding light filter, the outer cladding of the encapsulated optical fiber is a high refractive index layer, the refractive index of the high refractive index layer is greater than 1.456, and the absolute value of the fluctuation range of the refractive index of the high refractive index layer is less than 0.044.
Optionally, the temperature data processor includes a temperature acquisition module and a processing module; the temperature acquisition module is connected with the temperature sensor; the processing module is connected with the temperature acquisition module; the processing module calculates the total irradiation dose and the irradiation dose rate, and the total irradiation dose and the irradiation dose rate satisfy the following formulas:
wherein,
the unit is Gy for total irradiation dose;
is an empirical value;
the numerical aperture of the fiber core of the packaging optical fiber of the cladding light filter;
the diameter of the fiber core of the packaging optical fiber is in mum;
the diameter of an inner cladding layer which is used for packaging the optical fiber and is sleeved with the outer side of a fiber core of the optical fiber is in the unit of mu m;
the temperature of the metal packaging layer before irradiation is measured in units of ℃;
the temperature of the metal packaging layer after irradiation is measured in units of ℃;
is the central wavelength of the fiber laser, and the unit is mum;
the radiation dose rate is Gy/h;
the irradiation duration is given in units of h.
The invention also discloses an optical fiber irradiation monitoring method, which is suitable for any optical fiber irradiation monitoring device, and comprises the following steps:
s1, obtaining the temperature of the metal packaging layer before irradiation
；
S2, irradiating the multimode optical fiber in the irradiation field to be measured and obtaining the irradiation duration of the multimode optical fiber
And the irradiation duration
Corresponding temperature of irradiated metal encapsulation layer
；
S3, according to the core numerical aperture of the packaged optical fiber of the cladding light filter
Core diameter of the encapsulated fiber
Inner cladding diameter of inner cladding of packaging optical fiber sleeved outside fiber core
Temperature of
Temperature of
Center wavelength of fiber laser
Obtaining the total dose of irradiation
(ii) a According to total dose of radiation
And duration of irradiation
Obtaining irradiation dose rate
。
Optionally, the functional relationship satisfies:
the functional relationship satisfies:
total dose of radiation
And irradiation dose rate
Satisfies the following conditions:
wherein,
the unit is Gy;
is an empirical value;
the unit is mum;
the unit is mum;
、
the unit is;
the unit is mum;
the unit is Gy/h;
the unit is h.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
high-energy rays (such as nuclear radiation and the like) can cause color centers to be generated in the multimode fiber, the generation of the color centers can cause the refractive index of the multimode fiber to be changed and Rayleigh scattering in the multimode fiber to be enhanced, so that signal laser transmitted in a fiber core can be leaked into a quartz cladding (namely an inner cladding) to become cladding light, the cladding light can be filtered out to a metal packaging layer by a cladding light filter when passing through the cladding light filter, the temperature rise of the metal packaging layer is caused, and the total dose and dose rate of a radiation field can be calculated by monitoring the temperature rise amount and the temperature rise speed of the metal packaging layer. The temperature rise caused by the small part of signal laser leaked to the inner cladding due to color center generated by high-energy irradiation is detected, so that the upper limit of the monitoring irradiation dose and/or the irradiation dose rate of the invention is greatly improved, and the invention can be applied to the environment with high dose and/or high irradiation dose rate. Most of the signal laser which is not leaked to the inner cladding due to the color center is absorbed and attenuated by the thermoelectric material absorber, so that safety accidents caused by heat generation of high-power signal laser are avoided, and the use safety of the invention is greatly improved.
Compared with the prior art, the multimode fiber laser device has the advantages of simple structure, easiness in realization and compact layout, can effectively monitor a large-dose irradiation environment for a long time, conjecture the temperature change condition of the irradiated multimode fiber, reasonably design the structure of the multimode fiber laser device, and improve the reliability of the multimode fiber laser device. In addition, in the using process, the multimode optical fiber does not need to be frequently replaced, and the multimode optical fiber does not need to have a high dose saturation value, so that the using cost is low.
The multimode optical fiber is continuously bleached by the bleaching light, so that the multimode optical fiber with reduced performance caused by high-energy irradiation is recovered, the continuous high quality of the multimode optical fiber in the using process is realized, and the long service life and the high accuracy, long-acting stability and scientificity of the monitoring result of the multimode optical fiber are effectively ensured.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an optical fiber irradiation monitoring device according to the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of an optical fiber irradiation monitoring device of the present invention applied to gamma ray irradiation;
FIG. 3 is a graph showing cladding light contrast of a multimode optical fiber before and after exposure to a total dose of 1000 Gy.
In all the figures, the same reference numerals denote the same features, in particular: the system comprises a 1-optical fiber laser, a 2-beam combiner, a 3-multimode optical fiber, a 4-cladding light filter, a 5-temperature sensor, a 6-temperature data processor, a 7-thermoelectric material absorber, 8, 9, 10, 11, 12 and 13-bleaching light sources and 14-gamma ray irradiation fields to be detected.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In one embodiment of the present invention, as shown in fig. 1 and 2, a fiber optic radiation monitoring device includes: an optical fiber laser 1 for emitting signal laser light, the output power of the signal laser light emitted from the optical fiber laser 1 is not less than 500W, and the beam quality factor M2Less than 1.5; a bleaching light source (8, 9, 10, 11, 12, 13) for emitting a bleaching light; a beam combiner 2; a multimode optical fiber 3; a cladding light filter 4, wherein a metal packaging layer is packaged outside the cladding light filter 4; the temperature sensor 5 is arranged on the metal packaging layer and used for measuring the temperature of the metal packaging layer; the temperature data processor 6 is connected with the temperature sensor 5; and, a thermoelectric material absorber 7; signal laser emitted from the fiber laser 1 and bleaching emitted from the bleaching light source (8, 9, 10, 11, 12, 13)The light is coupled to the fiber core and the inner cladding of the multimode optical fiber 3 respectively through the beam combiner 2 (namely, the signal laser emitted by the optical fiber laser 1 is coupled to the fiber core of the multimode optical fiber 3 through the beam combiner 2, the bleaching light emitted by the bleaching light sources (8, 9, 10, 11, 12 and 13) is coupled to the inner cladding of the multimode optical fiber 3 through the beam combiner 2), and the inner cladding is sleeved on the outer side of the fiber core; the multimode fiber 3 and the cladding light filter 4 are coupled, so that the signal laser transmitted by the core of the multimode fiber 3 is coupled to the cladding light filter 4, and is emitted into the thermoelectric material absorber 7 after passing through the cladding light filter 4; the clad light transmitted in the inner cladding of the multimode optical fiber 3 is filtered out to the metal clad by the clad light filter 4.
Fig. 3 is a graph showing the cladding light contrast of the multimode optical fiber 3 before and after irradiation with a total dose of 1000Gy, and it can be seen that the cladding light of the multimode optical fiber 3 increases after irradiation. This is because the high-energy radiation (such as nuclear radiation) causes a color center in the multimode fiber 3, and the color center causes a change in the refractive index of the multimode fiber 3 and an increase in rayleigh scattering in the multimode fiber 3, so that the signal laser transmitted through the core of the multimode fiber 3 leaks into the silica cladding (hereinafter, inner cladding) of the multimode fiber 3 to become cladding light (i.e., cladding light out of the multimode fiber 3), and the cladding light is filtered out to the metal encapsulation layer by the cladding light filter 4 when passing through the cladding light filter 4, so that the temperature rise of the metal encapsulation layer is caused, and the total dose and dose rate of the radiation field can be calculated by monitoring the temperature rise and the temperature rise speed of the metal encapsulation layer by the temperature sensor 5 and the temperature data processor 6.
In practical applications, more than one temperature sensor 5 may be disposed, and the temperature data processor 6 obtains an average value of temperature values monitored by the more than one temperature sensor 5 as the temperature of the corresponding time point. The temperature sensor 5 periodically (can be set) collects the temperature of the metal encapsulation layer, so that the temperature data processor 6 can acquire the temperature of the metal encapsulation layer at different moments. The output end of the fiber laser 1 is an output fiber, and the output fiber of the fiber laser 1 is welded with the input fiber of the beam combiner 2 to realize the coupling connection of the two.
Optionally, the combiner 2 is a (6 + 1) × 1 combiner, and both the input end and the output end of the combiner are double-clad optical fibers. Specifically, the combiner 2 has six pump arms and one signal arm, wherein each pump arm is coupled to a bleaching light source (8, 9, 10, 11, 12, 13), and the signal arm of the combiner 2 (the input end of the combiner 2) is coupled to the optical fiber of the fiber laser 1. In practical applications, the connection between the two can be realized by welding. Of course, in another embodiment of the present invention, the six pump arms of the beam combiner 2 can be coupled with a bleaching light source (8, 9, 10, 11, 12, 13).
Optionally, the multimode fiber 3 is a triple-clad fiber, which includes a core, an inner cladding made of fluorine-doped silica, a second cladding and a third cladding, which are sequentially arranged from inside to outside; the refractive index of the fiber core is larger than that of the inner cladding; the refractive index of the inner cladding is larger than that of the second cladding; the refractive index of the second cladding is less than that of the third cladding; the signal laser emitted by the beam combiner 2 is emitted into the fiber core of the multimode fiber 3; the bleached light exiting the combiner 2 is injected into the inner cladding of the multimode optical fiber 3.
Optionally, the second cladding has a refractive index no greater than 1.38; the refractive index of the third cladding is not less than 1.56; the core numerical aperture of the core is greater than 0.1.
Optionally, the output end of the beam combiner 2 is an output optical fiber, and the output optical fiber is coupled with the multimode optical fiber 3; the size of the core of the multimode optical fiber 3 is larger than that of the output core of the output optical fiber; the size of the inner cladding is larger than that of the output inner cladding of the output optical fiber, and the output inner cladding is sleeved on the outer side of the output fiber core.
Optionally, the input fiber and the output fiber of the cladding light filter 4 are both double-cladding fibers, the core size of the double-cladding fibers is larger than that of the multimode fiber 3, and the inner cladding size of the double-cladding fibers is larger than that of the multimode fiber 3; the core numerical aperture of the double-clad fiber is larger than that of the multimode fiber 3.
Optionally, the metal encapsulation layer is sleeved outside the encapsulated fiber of the cladding light filter 4, the outer cladding of the encapsulated fiber is a high refractive index layer, the refractive index of the high refractive index layer is greater than 1.456, and the fluctuation range of the refractive index of the high refractive index layer is less than 0.044. Optionally, the outer cladding of the encapsulated fiber is a high refractive index metal outer cladding, thereby ensuring that the outer cladding of the encapsulated fiber can absorb the cladding light and can ensure that the state of saturation is not easily reached. Optionally, the outer surface of the metal encapsulation layer is smooth.
Optionally, the coupling connection among the fiber laser 1, the combiner 2, and the multimode fiber 3 is realized by fiber fusion, and the sizes of the fiber cores of the fiber laser 1, the combiner 2, and the multimode fiber 3 are not less than 20 μm.
Optionally, the temperature data processor 6 comprises a temperature acquisition module and a processing module; the temperature acquisition module is connected with the temperature sensor 5; the processing module is connected with the temperature acquisition module; the processing module calculates the total irradiation dose and the irradiation dose rate, and the total irradiation dose and the irradiation dose rate satisfy the following formula:
wherein,
the unit is Gy for total irradiation dose;
is an empirical value;
the numerical aperture of the fiber core of the packaging optical fiber of the cladding light filter;
the diameter of the fiber core of the packaging optical fiber is in mum;
to sealThe diameter of an inner cladding layer for containing the optical fiber and sleeved on the outer side of the fiber core is in mum;
the temperature of the metal packaging layer before irradiation is measured in units of ℃;
the temperature of the metal packaging layer after irradiation is measured in units of ℃;
is the central wavelength of the fiber laser, and the unit is mum;
the radiation dose rate is Gy/h;
the irradiation duration is given in units of h.
In another embodiment of the present invention, different from the above embodiments, the outer cladding of the packaged optical fiber of the present embodiment is a high refractive index glue, and the high refractive index glue has a heat resistance. The high-refractive-index glue can be more than one layer, and when the high-refractive-index glue is more than two layers, the refractive indexes of the high-refractive-index glue sequentially arranged from inside to outside are increased progressively.
In another embodiment of the present invention, different from the above embodiments, the packaged optical fiber of the present embodiment is an optical fiber made by etching with hydrofluoric acid (HF).
In another embodiment of the present invention, different from the above embodiments, the outer side of the packaged optical fiber of the present embodiment is sleeved with a sapphire layer having a refractive index greater than that of the packaged optical fiber. Of course, in other embodiments of the present invention, the package fiber may also be other fibers capable of transmitting the cladding light and filtering out the cladding light, but all fall within the scope of the present invention.
In practical application, as shown in fig. 2, when the optical fiber irradiation monitoring device is applied to gamma ray irradiation for monitoring, the multimode optical fiber 3 is placed in the irradiation field 14 to be measured for gamma ray (i.e. in the environment of gamma ray irradiation), and the other components (the optical fiber laser 1, the beam combiner 2, the cladding light filter 4, the temperature sensor 5, the temperature data processor 6, the thermoelectric material absorber 7 and the bleaching light source (8, 9, 10, 11, 12, 13)) of the optical fiber irradiation monitoring device are arranged away from the irradiation field 14 to be measured for gamma ray.
In another embodiment of the present invention, unlike the above embodiments, the present embodiment does not have the bleaching light source (8, 9, 10, 11, 12, 13) and the beam combiner 2, and the signal laser emitted from the fiber laser 1 is directly coupled to the core of the multimode fiber 3. Compared with the above embodiment, since the quality of the multimode optical fiber 3 is not continuously restored by the floating white light in the embodiment, the multimode optical fiber needs to be periodically replaced according to needs to ensure that the multimode optical fiber can be effectively and stably used in a high-dose and/or high-irradiation dose rate environment for a long time.
In another embodiment of the present invention, unlike any of the above embodiments, the present embodiment does not include a bleaching light source (8, 9, 10, 11, 12, 13), and the signal laser light emitted from the fiber laser 1 is coupled to the core of the multimode fiber 3 via the beam combiner 2.
In another embodiment of the present invention, an optical fiber irradiation monitoring method, which is applied to the optical fiber irradiation monitoring apparatus according to any one of the above embodiments, includes the steps of:
s1, obtaining the temperature of the metal packaging layer before irradiation
；
S2, irradiating the multimode optical fiber in the irradiation field to be measured and obtaining the irradiation duration of the multimode optical fiber
And the irradiation duration
Corresponding temperature of irradiated metal encapsulation layer
；
S3, according to the core numerical aperture of the packaged optical fiber of the cladding light filter
Core diameter of the encapsulated fiber
Inner cladding diameter of inner cladding of packaging optical fiber sleeved outside fiber core
Temperature of
Temperature of
Center wavelength of fiber laser
Obtaining the total dose of irradiation
(ii) a According to total dose of radiation
And duration of irradiation
Obtaining irradiation dose rate
。
Optionally, the functional relationship satisfies:
the functional relationship satisfies:
total dose of radiation
And irradiation dose rate
Satisfies the following conditions:
wherein,
the unit is Gy;
is an empirical value;
the unit is mum;
the unit is mum;
、
the unit is;
the unit is mum;
the unit is Gy/h;
the unit is h.
It is worth mentioning that it is possible to show,
、
the average value can be a single value or an average value, and is specifically set according to actual needs.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. An optical fiber radiation monitoring device, comprising:
fiber laser for emitting signal laser, output power of signal laser emitted by the fiber laser being not less than 500W, beam quality factor M2Less than 1.5;
a multimode optical fiber;
the cladding light filter is provided with a metal packaging layer on the outer side;
a temperature sensor disposed at the metal encapsulation layer to measure a temperature of the metal encapsulation layer;
the temperature data processor is connected with the temperature sensor; and, a thermoelectric material absorber;
the signal laser emitted by the optical fiber laser is coupled to the fiber core of the multimode optical fiber; the multimode optical fiber is coupled with the cladding light filter, so that signal laser transmitted in a fiber core of the multimode optical fiber is coupled to the cladding light filter and is injected into the thermoelectric material absorber; the cladding light transmitted in the inner cladding of the multimode optical fiber is filtered out to the metal encapsulation layer by the cladding light filter.
2. The fiber optic radiation monitoring device of claim 1, further comprising:
and the signal laser emitted by the optical fiber laser is coupled to the fiber core of the multimode optical fiber through the beam combiner.
3. The fiber optic radiation monitoring device of claim 2, further comprising:
and the bleaching light source is used for emitting bleaching light, the bleaching light emitted by the bleaching light source is coupled to the inner cladding of the multimode optical fiber through the beam combiner, and the inner cladding is sleeved on the outer side of the fiber core.
4. The optical fiber irradiation monitoring device according to any one of claims 1 to 3, wherein:
the multimode optical fiber is a three-clad optical fiber which comprises a fiber core, an inner cladding, a second cladding and a third cladding, wherein the fiber core, the inner cladding, the second cladding and the third cladding are sequentially arranged from inside to outside;
the refractive index of the fiber core is larger than that of the inner cladding;
the refractive index of the inner cladding is greater than that of the second cladding;
the second cladding layer has a refractive index less than a refractive index of the third cladding layer.
5. The optical fiber irradiation monitoring device according to any one of claims 1 to 3, wherein: the input optical fiber and the output optical fiber of the cladding light filter are double-cladding optical fibers, the size of a fiber core of each double-cladding optical fiber is larger than that of a fiber core of the multimode optical fiber, and the size of an inner cladding of each double-cladding optical fiber is larger than that of an inner cladding of the multimode optical fiber; and the numerical aperture of the fiber core of the double-clad optical fiber is larger than that of the multimode optical fiber.
6. The optical fiber irradiation monitoring device according to any one of claims 1 to 3, wherein: the metal packaging layer is sleeved on the outer side of the packaging optical fiber of the cladding light filter, the outer cladding of the packaging optical fiber is a high-refractive-index layer, the refractive index of the high-refractive-index layer is larger than 1.456, and the absolute value of the fluctuation range of the refractive index of the high-refractive-index layer is smaller than 0.044.
7. The optical fiber irradiation monitoring device according to any one of claims 1 to 3, wherein:
the temperature data processor comprises a temperature acquisition module and a processing module;
the temperature acquisition module is connected with the temperature sensor; the processing module is connected with the temperature acquisition module;
the processing module calculates the total irradiation dose and the irradiation dose rate, and the total irradiation dose and the irradiation dose rate satisfy the following formulas:
wherein,
the unit is Gy for total irradiation dose;
is an empirical value;
the numerical aperture of the fiber core of the packaging optical fiber of the cladding light filter;
the diameter of the fiber core of the packaging optical fiber is in mum;
the diameter of an inner cladding layer which is used for packaging the optical fiber and is sleeved with the outer side of a fiber core of the optical fiber is in the unit of mu m;
the temperature of the metal packaging layer before irradiation is measured in units of ℃;
the temperature of the metal packaging layer after irradiation is measured in units of ℃;
is the central wavelength of the fiber laser, and the unit is mum;
the radiation dose rate is Gy/h;
the irradiation duration is given in units of h.
8. An optical fiber irradiation monitoring method applied to the optical fiber irradiation monitoring device according to any one of claims 1 to 7, comprising the steps of:
s1, obtaining the temperature of the metal packaging layer before irradiation
；
S2, irradiating the multimode optical fiber in the irradiation field to be measured and obtaining the irradiation duration of the multimode optical fiber
And the irradiation duration
Corresponding temperature of irradiated metal encapsulation layer
；
S3, packaging according to the cladding light filterCore numerical aperture of optical fiber
Core diameter of the encapsulated fiber
Inner cladding diameter of inner cladding of packaging optical fiber sleeved outside fiber core
Temperature of
Temperature of
Center wavelength of fiber laser
Obtaining the total dose of irradiation
(ii) a According to total dose of radiation
And duration of irradiation
Obtaining irradiation dose rate
；
The functional relationship satisfies:
irradiation of radiationTotal dose
And irradiation dose rate
Satisfies the following conditions:
wherein,
the unit is Gy;
is an empirical value;
the unit is mum;
the unit is mum;
、
the unit is;
the unit is mum;
the unit is Gy/h;
the unit is h.
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