CN105510234A - Optical fiber sensing-based laser excitation heat wave signal detection device - Google Patents
Optical fiber sensing-based laser excitation heat wave signal detection device Download PDFInfo
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- CN105510234A CN105510234A CN201511012704.1A CN201511012704A CN105510234A CN 105510234 A CN105510234 A CN 105510234A CN 201511012704 A CN201511012704 A CN 201511012704A CN 105510234 A CN105510234 A CN 105510234A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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Abstract
The invention provides an optical fiber sensing-based laser excitation heat wave signal detection device, comprising a pumping laser light source, a detection laser light source, a focusing lens and optical fiber. The optical fiber is used to transmit a pumping laser beam and a detection laser light beam, the same focusing lens is used to converge the two beams, and the detection laser light beam reflected or transmitted by a sample is received by also using the optical fiber at a detection end, so that the structure of a whole light path system is greatly simplified, instrument microminiaturization and portability can be realized, instrument cost is greatly reduced, and the popularization and application of a laser excitation heat wave signal detection technology are facilitated.
Description
Technical field
The present invention relates to laser excitation thermal wave detection technical field, specifically a kind of laser excitation heat wave signal supervisory instrument based on Fibre Optical Sensor.
Background technology
Laser excitation thermal wave technology is a kind of effective detection means, has the features such as highly sensitive, contactless, metering system is various, can be used for the detection analysis (comprising the absorption characteristic of material, thermophysical property, defect etc.) of dissimilar material properties.To a kind of conventional detection mode that laser excitation heat wave signal detects be: after pumping laser and material interact and excite and produce heat wave signal, also in material, the region of heat wave signal is produced with a branch of more weak exploring laser light, exploring laser light light beam can have certain angle with pumping laser light beam, also can be coaxial.
When exploring laser light to excite the heat wave signal area of generation by pumping laser, its spatial characteristic will change, and produces newly-increased convergence or effect weakening.By the convergence of detection outgoing exploring laser light or the change of divergence characterization, the material behavior producing heat wave signal area just can be obtained.Usually can be added a spatial filter by the appropriate location in outgoing exploring laser light light path to the detection of the change of exploring laser light spatial characteristic to carry out, spatial filter allows part detection laser energy to enter photodetector.
In laser excitation heat wave signal supervisory instrument conventional at present, general pumping laser light beam and exploring laser light light beam are applied on sample respectively through after respective independently light path system.The components and parts such as a series of beam deflection, beam shaping, light beam focusing and probe unit are contained in respective light path system, thus cause apparatus structure loaded down with trivial details, bulky, expensive, be unfavorable for carrying carrying, significantly limit applying of this technology.
Summary of the invention
The object of the present invention is to provide a kind of laser excitation heat wave signal supervisory instrument based on Fibre Optical Sensor, utilize the core diameter of optical fiber own very little, there is this characteristic of spatial filtering ability, simultaneously in conjunction with the color aberration characteristics of optical focusing lens, realize the detection to laser excitation heat wave signal, thus the structure of whole pick-up unit is simplified greatly, the problem that current Opto-thertnal detection device device is loaded down with trivial details, bulky, expensive, be unfavorable for carrying carrying can be solved.
Technical scheme of the present invention is:
Based on a laser excitation heat wave signal supervisory instrument for Fibre Optical Sensor, comprise pumping laser light source, exploring laser light light source and the first condenser lens; Described pumping laser light source, for exporting pumping laser beam, described pumping laser light beam incides the center of the first condenser lens after ovennodulation by the first optical fiber; Described exploring laser light light source, for exporting exploring laser light light beam, described exploring laser light light beam incides the marginal position of the first condenser lens by the second optical fiber; Described first condenser lens, for the same area that will converge to the pumping laser light beam of different incidence point incidence and exploring laser light light beam on sample, described sample is positioned over the focal plane place of the first condenser lens; Described first condenser lens, also for collecting the exploring laser light light beam from sample reflection, the described exploring laser light light beam from sample reflection after the first condenser lens is collected, then enters photodetector by the 3rd optical fiber.
Based on a laser excitation heat wave signal supervisory instrument for Fibre Optical Sensor, comprise pumping laser light source, exploring laser light light source, the first condenser lens and the second condenser lens; Described pumping laser light source, for exporting pumping laser beam, described pumping laser light beam incides the center of the first condenser lens after ovennodulation by the first optical fiber; Described exploring laser light light source, for exporting exploring laser light light beam, described exploring laser light light beam incides the marginal position of the first condenser lens by the second optical fiber; Described first condenser lens, for the same area that will converge to the pumping laser light beam of different incidence point incidence and exploring laser light light beam on sample, described sample is positioned over the focal plane place of the first condenser lens; Described second condenser lens, for collecting the exploring laser light light beam from sample transmission, the described exploring laser light light beam from sample transmission after the second condenser lens is collected, then enters photodetector by the 3rd optical fiber.
The described laser excitation heat wave signal supervisory instrument based on Fibre Optical Sensor, the described 3rd is provided with filtering apparatus between optical fiber and photodetector.
Beneficial effect of the present invention is:
As shown from the above technical solution, the present invention utilizes optical fiber to transmit pumping laser beam and exploring laser light light beam, and utilize same condenser lens to assemble this two-beam, also optical fiber is utilized to receive the exploring laser light light beam by sample reflection or transmission in end of probe, whole light path system structure is simplified greatly, the microminiaturization of instrument, portable can be realized, greatly saved instrument cost, be conducive to applying of laser excitation thermal wave detection technology.
Accompanying drawing explanation
Fig. 1 is apparatus structure schematic diagram (reflective-mode) of the present invention;
Fig. 2 is apparatus structure schematic diagram (transmission mode) of the present invention;
Fig. 3 is the schematic diagram that optic fibre input end of the present invention is equivalent to spatial filter, wherein, and the corresponding reflective-mode of Fig. 3 (a), the corresponding transmission mode of Fig. 3 (b).
Embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, a kind of laser excitation heat wave signal supervisory instrument based on Fibre Optical Sensor of reflective-mode, comprises pumping laser light source 1, exploring laser light light source 2 and the first condenser lens 41.The pumping laser light beam that pumping laser light source 1 exports incides the center of the first condenser lens 41 after ovennodulation by the first optical fiber 31; The exploring laser light light beam that exploring laser light light source 2 exports incides the marginal position of the first condenser lens 41 by the second optical fiber 32; The same area that first condenser lens 41 will converge to the pumping laser light beam of different incidence point incidence and exploring laser light light beam on sample 5, sample 5 is positioned over the focal plane place of the first condenser lens 41; The exploring laser light light beam reflected from sample 5 also collected by first condenser lens 41, and the exploring laser light light beam reflected from sample 5, after the first condenser lens 41 is collected, then enters photodetector 7 by the 3rd optical fiber 33 and filtering apparatus 6.
As shown in Figure 2, a kind of laser excitation heat wave signal supervisory instrument based on Fibre Optical Sensor of transmission mode, comprises pumping laser light source 1, exploring laser light light source 2, first condenser lens 41 and the second condenser lens 42.The pumping laser light beam that pumping laser light source 1 exports incides the center of the first condenser lens 41 after ovennodulation by the first optical fiber 31; The exploring laser light light beam that exploring laser light light source 2 exports incides the marginal position of the first condenser lens 41 by the second optical fiber 32; The same area that first condenser lens 41 will converge to the pumping laser light beam of different incidence point incidence and exploring laser light light beam on sample 5, sample 5 is positioned over the focal plane place of the first condenser lens 41; The exploring laser light light beam from sample 5 transmission collected by second condenser lens 42, from the exploring laser light light beam of sample 5 transmission after the second condenser lens 42 is collected, then enters photodetector 7 by the 3rd optical fiber 33 and filtering apparatus 6.
Each module of the present invention is connected in turn in order.The input end of the 3rd optical fiber 33 is equivalent to spatial filter, and object is the change making photodetector 7 only receive the exploring laser light propagation characteristic due to the generation of sample 5 thermal deformation.The effect of filtering apparatus 6 is the parasitic lights filtered except exploring laser light.The laser excitation heat wave signal that photodetector 7 receives again by connected modes such as Serial Port Lines, by heat wave Signal transmissions to computing machine, can obtain the laser excitation heat wave characteristics of signals of sample 5 after signal supervisory instrument through signal analysis and processing.
Principle of work of the present invention:
Pumping laser light beam and exploring laser light light beam are transferred to diverse location on the first condenser lens 41 through the first optical fiber 31, second optical fiber 32 respectively, wherein pumping laser light beam is positioned at center, exploring laser light light beam is positioned at marginal position, and pumping laser light beam and exploring laser light light beam have different wave length.Due to the convergence performance of the first condenser lens 41 itself, pumping laser light beam and exploring laser light light beam can be converged onto same point; During measurement, sample 5 is positioned over the focal position of the first condenser lens 41.The exploring laser light light beam reflected from sample 5 is collected via the first condenser lens 41 again, and is received by the 3rd optical fiber 33; Collect via the second condenser lens 42 from the exploring laser light light beam of sample 5 transmission, and received by the 3rd optical fiber 33.
As shown in Figure 3, optical fiber structure is followed successively by coat 301, covering 302 and fibre core 303 from outside to inside.Because fibre core 303 is thinner, usually from several micron to tens microns, be significantly smaller than the size of exploring laser light hot spot, therefore, when employing the 3rd optical fiber 33 receives exploring laser light light beam, 3rd optical fiber 33 is inherently equivalent to a spatial filter, only allows part detection laser signal enter in the 3rd optical fiber 33.Photodetector 7 detects the exploring laser light signal transmitted through the 3rd optical fiber 33, thus realizes the detection to laser excitation heat wave signal.
In this technology utilizing weak exploring laser light to detect laser excitation heat wave signal, the dimension scale be irradiated between pumping laser hot spot on sample 5 and exploring laser light hot spot greatly affects detection sensitivity.In the present invention, this point can utilize the color aberration characteristics of the first condenser lens 41 itself to ensure.Due to the color aberration characteristics of the first condenser lens 41 itself, inconsistent in the size of its focal position pumping laser hot spot and exploring laser light hot spot.Can, by selecting suitable wavelength and lens parameter, make the dimension scale between pumping laser hot spot and exploring laser light hot spot meet certain relation, thus reach optimum Detection results.
The above embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determine.
Claims (3)
1. based on a laser excitation heat wave signal supervisory instrument for Fibre Optical Sensor, it is characterized in that: comprise pumping laser light source, exploring laser light light source and the first condenser lens;
Described pumping laser light source, for exporting pumping laser beam, described pumping laser light beam incides the center of the first condenser lens after ovennodulation by the first optical fiber;
Described exploring laser light light source, for exporting exploring laser light light beam, described exploring laser light light beam incides the marginal position of the first condenser lens by the second optical fiber;
Described first condenser lens, for the same area that will converge to the pumping laser light beam of different incidence point incidence and exploring laser light light beam on sample, described sample is positioned over the focal plane place of the first condenser lens;
Described first condenser lens, also for collecting the exploring laser light light beam from sample reflection, the described exploring laser light light beam from sample reflection after the first condenser lens is collected, then enters photodetector by the 3rd optical fiber.
2. based on a laser excitation heat wave signal supervisory instrument for Fibre Optical Sensor, it is characterized in that: comprise pumping laser light source, exploring laser light light source, the first condenser lens and the second condenser lens;
Described pumping laser light source, for exporting pumping laser beam, described pumping laser light beam incides the center of the first condenser lens after ovennodulation by the first optical fiber;
Described exploring laser light light source, for exporting exploring laser light light beam, described exploring laser light light beam incides the marginal position of the first condenser lens by the second optical fiber;
Described first condenser lens, for the same area that will converge to the pumping laser light beam of different incidence point incidence and exploring laser light light beam on sample, described sample is positioned over the focal plane place of the first condenser lens;
Described second condenser lens, for collecting the exploring laser light light beam from sample transmission, the described exploring laser light light beam from sample transmission after the second condenser lens is collected, then enters photodetector by the 3rd optical fiber.
3. the laser excitation heat wave signal supervisory instrument based on Fibre Optical Sensor according to claim 1 and 2, is characterized in that: the described 3rd is provided with filtering apparatus between optical fiber and photodetector.
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| CN201511012704.1A CN105510234A (en) | 2015-12-31 | 2015-12-31 | Optical fiber sensing-based laser excitation heat wave signal detection device |
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| CN201511012704.1A CN105510234A (en) | 2015-12-31 | 2015-12-31 | Optical fiber sensing-based laser excitation heat wave signal detection device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108037077A (en) * | 2017-12-06 | 2018-05-15 | 中国工程物理研究院激光聚变研究中心 | A kind of integrated laser induces surface acoustic wave defect detecting device |
| CN108444525A (en) * | 2018-03-13 | 2018-08-24 | 哈尔滨理工大学 | A kind of wireless sensing measuring system for grid equipment |
| CN113155795A (en) * | 2021-04-15 | 2021-07-23 | 西北核技术研究所 | Device and method for directly measuring upper energy level fluorescence lifetime of rare earth element doped optical fiber laser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108037077A (en) * | 2017-12-06 | 2018-05-15 | 中国工程物理研究院激光聚变研究中心 | A kind of integrated laser induces surface acoustic wave defect detecting device |
| CN108444525A (en) * | 2018-03-13 | 2018-08-24 | 哈尔滨理工大学 | A kind of wireless sensing measuring system for grid equipment |
| CN113155795A (en) * | 2021-04-15 | 2021-07-23 | 西北核技术研究所 | Device and method for directly measuring upper energy level fluorescence lifetime of rare earth element doped optical fiber laser |
| CN113155795B (en) * | 2021-04-15 | 2023-03-21 | 西北核技术研究所 | Device and method for directly measuring upper energy level fluorescence lifetime of rare earth element doped optical fiber laser |
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