CN101694526A - Reflection type optical fiber nuclear radiation sensor - Google Patents
Reflection type optical fiber nuclear radiation sensor Download PDFInfo
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- CN101694526A CN101694526A CN200910201727A CN200910201727A CN101694526A CN 101694526 A CN101694526 A CN 101694526A CN 200910201727 A CN200910201727 A CN 200910201727A CN 200910201727 A CN200910201727 A CN 200910201727A CN 101694526 A CN101694526 A CN 101694526A
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Abstract
The invention discloses a reflection type optical fiber nuclear radiation sensor which utilizes the characteristic that the radiation causes optical fiber loss to increase. The structure of the sensor comprises an optical fiber path divider and an optical fiber coupler, wherein an input end of the optical fiber path divider is connected with a light source, a first output end thereof is connected with an input end of the optical fiber coupler, and a second output end thereof is connected with a second input end of a light receiving module; a communication end of the optical fiber coupler is connected with a light reflection mirror by a sensing optical fiber; and an output end of the optical fiber coupler is connected with a first input end of the light receiving module which is connected with a microcomputer. The device adopts the design of a double-channel reflection type light path structure, and can better remove the influence on a system due to factors such as electromagnetic interference, temperature shift and the like, and lead the system to have preferable sensitivity and stability; and simultaneously, a single end detection structure is simple, and has small volume, light weight, convenient installation, and low cost.
Description
Technical field
The present invention relates to technical field of optical fiber sensing, be specifically related to a kind of reflection type optical fiber nuclear radiation sensor of monitoring nuclear radiation.
Background technology
Nuclear radiation transducer is to utilize radioactive isotope to carry out measured sensor, claims the radioactive isotope sensor again.Nuclear radiation transducer be based on measured matter to absorption, backscattering or the ray of ray to the ionization excitation of measured matter and carry out work.Radioactive isotope is emitted the particle (or claiming ray) that has certain energy in decay process, comprise α particle, β particle, gamma-rays and neutron ray.
Existing nuclear radiation transducer comprises radioactive source, detector and signaling conversion circuit.Nuclear radiation transducer generally produces luminescent effect according to some material under the nuclear radiation effect or the gas ionization effect is come work.Detector commonly used has three kinds of current ionization chamber, geiger's tube and scintillation counters.
Yet but do not have in the prior art a kind of can be to monitoring nuclear radiation and sensing device that nuclear radiation is measured, we can oppositely utilize according to the principle of nuclear radiation transducer: the radiation meeting of alpha ray, gamma-rays etc. increases the absorption loss of fiber optic materials, thereby the output power of optical fiber is descended, utilize this characteristic of optical fiber to make the optical fiber radiation sensor.
Summary of the invention
The purpose of this invention is to provide a kind of reflection type optical fiber nuclear radiation sensor, this device causes the absorption loss of fiber optic materials to increase according to the radiation meeting, thereby the output power of optical fiber is descended, and utilizes this characteristic of optical fiber to make the optical fiber radiation sensor.Adopted the design of binary channels reflection formula light channel structure, can better eliminate because the influence that factors such as electromagnetic interference (EMI) and device temperature drift cause system, make system have better sensitivity and stability, simultaneously single-ended detecting structure is simple, volume is little, in light weight, be convenient to install, cost is low.
Technical matters to be solved by this invention is achieved through the following technical solutions:
A kind of reflection type optical fiber nuclear radiation sensor, comprise an optical fiber splitter and a fiber coupler, the input end of described optical fiber splitter is connected with a light source, first output terminal of described optical fiber splitter is connected with the input end of described fiber coupler, second output terminal of described optical fiber splitter is connected with second input end of an Optical Receivers, and the communication ends of described fiber coupler is connected with a light reflection mirror by a sensor fibre; The output terminal of described fiber coupler is connected with the first input end of described Optical Receivers, and described Optical Receivers is connected with a microprocessor.
Further, sensor fibre described in this patent is the sensing lead glass optical fiber of absorbed radiation and light conduction.
Further, light source described in this patent is that output wavelength is the LASER Light Source that the semiconductor laser of 1310nm sends.
Further, Optical Receivers described in this patent comprises photo-detector, amplifying circuit and filtering circuit, and described photo-detector is coaxial tail fiber type PIN photodetector.
Further, light reflection mirror described in this patent is the high reflectivity semiconductor wafer of single-sided polishing.
Further, light source described in this patent is divided into first light beam and second light beam through described optical fiber splitter, first light beam inserts second input end of described Optical Receivers, second light beam is got back to described fiber coupler by described fiber coupler, described sensor fibre, described catoptron back reflection successively, arrive the first input end of described Optical Receivers by fiber coupler, described microprocessor obtains the nuclear radiation intensity level by the characteristic relation that the absorption loss of calculating nuclear radiation and causing described sensor fibre increases.
Further, the computing formula of microprocessor described in this patent is:
P
00/P
11＝KX/(1-X)
Wherein K is respectively the loss factor that described sensor fibre is taken place by the nuclear radiation effect, X:(1-X) is the beam split ratio of described optical fiber splitter.
The principle of work of patent device is: the nuclear radiation meeting of alpha ray, gamma-rays etc. increases the absorption loss of fiber optic materials, thereby the output power of optical fiber is descended.Light source is divided into two beam powers through optical fiber splitter and is respectively XP in this patent
0(1-X) P
0Light beam, (1-X) P
0Light beam draw (P through reference optical fiber
11) insert second input end of Optical Receivers, XP
0Light beam behind fiber coupler, inject light reflection mirror by sensor fibre, incident light arrives fiber coupler through sensor fibre once more after the light reflection mirror reflection, arrive the first input end of Optical Receivers again by fiber coupler, compare at the power of Optical Receivers with two light beams:
P
00/P
11＝KX/(1-X)
Wherein K is respectively the loss factor that sensor fibre is taken place by the radiant light effect, X:(1-X) is the beam split ratio of optical fiber splitter 3.
Calculate P through microprocessor
00/ P
11Value, the nuclear radiation intensity level that the characteristic relation that is caused the absorption loss of fiber optic materials and increased by radiation can obtain measuring.
The present invention has following effect than prior art: sensor of the present invention has adopted the design of binary channels reflection formula light channel structure, is to have increased a reference optical fiber, the variation of monitoring light source power with the difference of single channel system.Under same radiation condition, obtain reference optical fiber and place the tested optical fiber of radiation areas to export the result, under same radiation condition, obtain reference optical fiber and the variable power that places the tested optical fiber of radiation areas, again both are compared, set up one with reference to comparison system in the inside of system light path like this, eliminate flashing determining cause element, reach the purpose that improves system performance.
Description of drawings
The invention will be further described now to reach embodiment in conjunction with the accompanying drawings:
Fig. 1 is a light channel structure synoptic diagram in apparatus of the present invention;
Fig. 2 is each member connection structure synoptic diagram of apparatus of the present invention;
Among the figure: 1-microprocessor 2-Optical Receivers 3-optical fiber splitter 4-light source 5-fiber coupler 6-sensing lead glass optical fiber 7-light reflection mirror
Embodiment
As shown in Figure 1, sensor light line structure of the present invention is: the input end 31 of optical fiber splitter 3 inserts light source; First output terminal of optical fiber splitter 3 is connected with the input end of fiber coupler 5 by optical fiber 23, second output terminal of optical fiber splitter 3 picks out by optical fiber 22, the communication ends of fiber coupler 5 (COM end) is used to connect sensing lead glass optical fiber 6, and the tail end of sensing lead glass optical fiber 6 is connected with light reflection mirror 7; The output terminal of fiber coupler 5 picks out by optical fiber 21.
As Fig. 2 is each member connection structure synoptic diagram of apparatus of the present invention, and it comprises: microprocessor 1, Optical Receivers 2, optical fiber splitter 3, light source 4, fiber coupler 5, sensing lead glass optical fiber 6 and light reflection mirror 7.The output terminal of light source 4 is connected with the input end of optical fiber splitter 3 by optical fiber 31; First output terminal of optical fiber splitter 3 is connected with the input end of fiber coupler 5, second output terminal of optical fiber splitter 3 is connected with second input end of Optical Receivers 2 through reference optical fiber 22, the communication ends of fiber coupler 5 (COM end) is connected with sensing lead glass optical fiber 6, and the tail end of sensing lead glass optical fiber 6 is connected with light reflection mirror 7; The output terminal of fiber coupler 5 is connected by the first input end of optical fiber 21 with Optical Receivers 2; Optical Receivers 2 is connected with microprocessor 1.
Sensing lead glass optical fiber 6 is a kind of special fibers, and its function is absorbed radiation and light conduction.
The effect of optical fiber splitter 3 is: the light incident side of light source 4 input optical fibre shunts 3, through optical fiber splitter 3 with in a certain ratio beam split after first and second light output ends output.
Optical fiber nuclear radiation sensor of the present invention has adopted the design of binary channels reflection formula light channel structure, is to have increased a reference optical fiber, the variation of monitoring light source power with the difference of single channel system.Under same radiation condition, obtain reference optical fiber and the variable power that places the tested optical fiber of radiation areas, again both are compared, set up one with reference to comparison system in the inside of system light path like this, eliminate flashing determining cause element, reach the purpose that improves system performance.
Those skilled in the art will recognize that, above-mentioned embodiment is exemplary, be in order better to make those skilled in the art can understand this patent, can not be interpreted as it is the restriction that this patent is comprised scope, so long as according to spirit that this patent discloses done anyly be equal to change or modify, all fall into the scope that this patent comprises.
Claims (7)
1. a reflection type optical fiber nuclear radiation sensor comprises an optical fiber splitter and a fiber coupler, it is characterized in that:
The input end of described optical fiber splitter is connected with a light source, first output terminal of described optical fiber splitter is connected with the input end of described fiber coupler, second output terminal of described optical fiber splitter is connected with second input end of an Optical Receivers, and the communication ends of described fiber coupler is connected with a light reflection mirror by a sensor fibre; The output terminal of described fiber coupler is connected with the first input end of described Optical Receivers, and described Optical Receivers is connected with a microprocessor.
2. reflection type optical fiber nuclear radiation sensor according to claim 1 is characterized in that:
Described sensor fibre is the sensing lead glass optical fiber of absorbed radiation and light conduction, and the intensity of the absorption loss of described sensor fibre and nuclear radiation effect has certain linear.
3. reflection type optical fiber nuclear radiation sensor according to claim 1 is characterized in that:
Described light source is that output wavelength is the LASER Light Source that the semiconductor laser of 1310nm sends.
4. reflection type optical fiber nuclear radiation sensor according to claim 1 is characterized in that:
Described Optical Receivers comprises photo-detector, amplifying circuit and filtering circuit, and described photo-detector is coaxial tail fiber type PIN photodetector.
5. reflection type optical fiber nuclear radiation sensor according to claim 1 is characterized in that:
Described light reflection mirror is the high reflectivity semiconductor wafer of single-sided polishing.
6. reflection type optical fiber nuclear radiation sensor according to claim 1 is characterized in that:
Described light source is divided into first light beam and second light beam through described optical fiber splitter, first light beam inserts second input end of described Optical Receivers, second light beam is got back to described fiber coupler by described fiber coupler, described sensor fibre, described catoptron back reflection successively, arrive the first input end of described Optical Receivers by fiber coupler, described microprocessor obtains the nuclear radiation intensity level by the characteristic relation that the absorption loss of calculating nuclear radiation and causing described sensor fibre increases.
7. reflection type optical fiber nuclear radiation sensor according to claim 1 is characterized in that:
The computing formula of described microprocessor is:
P
00/P
11＝KX/(1-X)
Wherein K is respectively the loss factor that described sensor fibre is taken place by the nuclear radiation effect, X: the beam split ratio that (1-X) is described optical fiber splitter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910201727A CN101694526A (en) | 2009-10-27 | 2009-10-27 | Reflection type optical fiber nuclear radiation sensor |
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|---|---|---|---|
| CN200910201727A CN101694526A (en) | 2009-10-27 | 2009-10-27 | Reflection type optical fiber nuclear radiation sensor |
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| CN101694526A true CN101694526A (en) | 2010-04-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621103A (en) * | 2012-03-09 | 2012-08-01 | 中国科学院长春光学精密机械与物理研究所 | Reflectivity tester for laser exploder |
| CN107923985A (en) * | 2015-06-25 | 2018-04-17 | 通用电气-日立核能美国有限责任公司 | For providing for monitoring and testing method, system and the equipment of the electronic signal of Geiger Muller radiation sensor |
| CN111505695A (en) * | 2020-04-26 | 2020-08-07 | 北京光衡科技有限公司 | Radiation dosimeter based on doped fiber self-excitation radiation |
-
2009
- 2009-10-27 CN CN200910201727A patent/CN101694526A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621103A (en) * | 2012-03-09 | 2012-08-01 | 中国科学院长春光学精密机械与物理研究所 | Reflectivity tester for laser exploder |
| CN107923985A (en) * | 2015-06-25 | 2018-04-17 | 通用电气-日立核能美国有限责任公司 | For providing for monitoring and testing method, system and the equipment of the electronic signal of Geiger Muller radiation sensor |
| CN111505695A (en) * | 2020-04-26 | 2020-08-07 | 北京光衡科技有限公司 | Radiation dosimeter based on doped fiber self-excitation radiation |
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Application publication date: 20100414 |