CN203489893U - Optical path structure of single-fiber fluorescence fiber sensor - Google Patents
Optical path structure of single-fiber fluorescence fiber sensor Download PDFInfo
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- CN203489893U CN203489893U CN201320296068.XU CN201320296068U CN203489893U CN 203489893 U CN203489893 U CN 203489893U CN 201320296068 U CN201320296068 U CN 201320296068U CN 203489893 U CN203489893 U CN 203489893U
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Abstract
The utility model relates to an optical path structure of a single-fiber fluorescence fiber sensor. The optical path structure comprises an optical fiber, an excitation light source, and a photoelectric detector. A front end face of the optical fiber is provided with a fluorescent material layer. Exciting light emitted by the excitation light source passes through a light splitting optical filter, and enters and couples with the optical fiber, and excites the fluorescent material layer to emit fluorescent light. The fluorescent light emitted by the fluorescent material layer is returned back to the light splitting optical filter by the optical fiber. The fluorescent light enters an isolation filter through the light splitting optical filter. The isolation filter is a filter transmitting fluorescent light and reflecting excitation light. The fluorescent light is transmitted to the photoelectric detector through the isolation filter. The photoelectric detector receives the fluorescent light and converts the fluorescent light to electric signals. The optical path structure of the single-fiber fluorescence fiber sensor improves mounting convenience of the excitation light source and the photoelectric detector through the light splitting optical filter, and excitation light interference is reduced by the isolation filter, thereby improving measuring precision.
Description
Technical field
The utility model relates to a kind of light channel structure of single fiber formula fluorescent optical fiber sensor.
Background technology
The sensing element of fluorescent optical fiber sensor is fluorescent material, is placed in sensing head top, joins with ordinary optic fibre, and optical fiber is connected with exciting light source, photoelectric detector etc. again.Fluorescent material after the irradiation that is subject to exciting light, the Electron absorption that it is inner photon energy, from ground state low-lying level, transit to excited state high level, and when electronics is got back to low-lying level from high level transition, will give off fluorescence.The various parameters of fluorescence are affected by extraneous factor to change, and the pass of fluorescence parameter and extraneous factor is the inherent inherent characteristic of fluorescent material, by measuring fluorescence parameter, just can obtain extraneous factor according to the inherent inherent characteristic of fluorescent material.
The fluorescent optical fiber sensor of single fiber formula is mainly used in measurement and the monitoring of various parameters, equipment control and product detection etc., obtained a large amount of application reliably in fields such as electric power, building, oil, chemical industry, electronics, Aero-Space, biology, medical and military and national defense.Single fiber formula fluorescent optical fiber sensor is only used single fiber to transmit exciting light and fluorescence simultaneously, and exciting light and fluorescence are all propagated in the fibre core of same optical fiber, can not penetrate or enter optical fiber and produce loss because of needs.The exciting light that exciting light source sends need to make it separated from each other by light channel structure with the fluorescence that enters photoelectric detector, does not produce interference.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of light channel structure of the easy for installation and single fiber formula fluorescent optical fiber sensor that measuring accuracy is high.
In order to solve the problems of the technologies described above, the technical solution of the utility model is: a kind of light channel structure of single fiber formula fluorescent optical fiber sensor, comprise optical fiber, exciting light source and photoelectric detector, the front end face of described optical fiber is provided with fluorescent material layer, the exciting light process light splitting optical filter coupled into optical fibres that described exciting light source sends activating fluorescent material layer are to send fluorescence, the fluorescence that described fluorescent material layer sends is got back to light splitting optical filter by optical fiber transmission, described fluorescence is injected into isolation optical filter through light splitting optical filter, described isolation optical filter is transmission fluorescence, the optical filter of reflection exciting light, described fluorescence is transmitted to photoelectric detector through isolation optical filter, described photoelectric detector receives fluorescence and fluorescence is converted to electric signal.
In order to solve better above-mentioned further technical matters, further technical scheme one of the present invention is: described light splitting optical filter is the optical filter of reflection exciting light, transmission fluorescence, exciting light that described exciting light source sends enters optical fiber excitation fluorescent material layer to send fluorescence through light splitting optical filter reflection coupling, the light path of described exciting light bends to arbitrarily angled, the fluorescence that described fluorescent material layer sends is got back to light splitting optical filter by optical fiber transmission, described fluorescence is transmitted to isolation optical filter through light splitting optical filter, and the light path of described fluorescence is direct-injection type.
Further, the cutoff wavelength of described light splitting optical filter is below incentive optical wavelength.
Further, the light channel structure of this single fiber formula fluorescent optical fiber sensor also comprise the exciting light that exciting light source is sent converge on optical fiber front end face and the fluorescence that optical fiber is passed back converge on photoelectric detector photosurface coupled lens.
In order to solve better above-mentioned further technical matters, further technical scheme two of the present invention is: described light splitting optical filter is the optical filter of transmission exciting light, reflected fluorescent light, the exciting light process light splitting optical filter transmission coupled into optical fibres that described exciting light source sends excitation fluorescent material layer are to send fluorescence, the light path of described exciting light is direct-injection type, the fluorescence that described fluorescent material layer sends is got back to light splitting optical filter by optical fiber transmission, described fluorescence reflexes to isolation optical filter through light splitting optical filter, and the light path of described fluorescence bends to arbitrarily angled.
Further, the cutoff wavelength of described light splitting optical filter is more than wavelength of fluorescence.
Further, the light channel structure of this single fiber formula fluorescent optical fiber sensor also comprises that the exciting light that exciting light source is sent converges on optical fiber front end face and the fluorescence that optical fiber is passed back converges at the coupled lens on photoelectric detector photosurface.
The utlity model has following beneficial effect: the light channel structure of this single fiber formula fluorescent optical fiber sensor is arbitrarily angled by the optical path-deflecting of exciting light or fluorescence by light splitting optical filter, improved exciting light source and photoelectric detector property easy for installation; And by isolation optical filter, exciting light and fluorescence are separated with filtering exciting light, reduced exciting light interference, improved measuring accuracy; The exciting light that can also exciting light source be sent by coupled lens converges at fiber end face, the fluorescence that optical fiber is passed back converges on the photosurface of photoelectric detector, improves coupling efficiency and the receiving efficiency of photoelectric detector to fluorescence that exciting light enters optical fiber.
Below in conjunction with the drawings and specific embodiments, the utility model is described in more detail.
Accompanying drawing explanation
Fig. 1 is 45 ° of light channel structure figure of the utility model embodiment mono-.
Fig. 2 is 45 ° of light channel structure figure of the utility model embodiment bis-.
In figure: 1-optical fiber, 2-exciting light source, 3-photoelectric detector, 4-fluorescent material layer, 5-light splitting optical filter, 6-coupled lens, 7-isolates optical filter, L1-exciting light, L2-fluorescence.
Embodiment
As shown in Figure 1 and 2, a kind of light channel structure of single fiber formula fluorescent optical fiber sensor, comprise optical fiber 1, exciting light source 2 and photoelectric detector 3, the front end face of described optical fiber 1 is provided with fluorescent material layer 4, exciting light L1 process light splitting optical filter 5 coupled into optical fibres 1 that described exciting light source 2 sends excitation fluorescent material layer 4 are to send fluorescence L2, the fluorescence L2 that described fluorescent material layer 4 sends transfers back to light splitting optical filter 5 by optical fiber 1, described fluorescence L2 is injected into isolation optical filter 7 through light splitting optical filter 5, described isolation optical filter 7 is transmission fluorescence L2, the optical filter of reflection exciting light L1, described fluorescence L2 is transmitted to photoelectric detector 3 through isolation optical filter 7, described photoelectric detector 3 receives fluorescence L2 and fluorescence L2 is converted to electric signal.
In the utility model, described light splitting optical filter 5 can be arbitrarily angled by the optical path-deflecting of exciting light L1 or fluorescence L2, to facilitate the installation of exciting light source 2 and photoelectric detector 3.
Embodiment mono-: as shown in Figure 1, described light splitting optical filter 5 is the optical filter of reflection exciting light L1, transmission fluorescence L2, exciting light L1 that described exciting light source 2 sends enters optical fiber 1 activating fluorescent material layer 4 to send fluorescence L2 through light splitting optical filter 5 reflection couplings, the light path of described exciting light L1 bends to arbitrarily angled, the fluorescence L2 that described fluorescent material layer 4 sends transfers back to light splitting optical filter 5 by optical fiber 1, described fluorescence L2 is transmitted to isolation optical filter 7 through light splitting optical filter 5, and the light path of described fluorescence L2 is direct-injection type.
In the present embodiment one, the cutoff wavelength of described light splitting optical filter 5 is below incentive optical wavelength.The light channel structure of this single fiber formula fluorescent optical fiber sensor also comprises that the exciting light L1 that exciting light source 2 is sent converges on optical fiber 1 front end face and the fluorescence L2 that optical fiber 1 is passed back converges at the coupled lens 6 on photoelectric detector 3 photosurfaces, to improve exciting light L1, enters the coupling efficiency of optical fiber 1 and the receiving efficiency of 3 couples of fluorescence L2 of photoelectric detector.
Embodiment bis-: as shown in Figure 2, described light splitting optical filter 5 is the optical filter of transmission exciting light L1, reflected fluorescent light L2, exciting light L1 that described exciting light source 2 sends is transmitted to optical fiber 1 activating fluorescent material layer 4 to send fluorescence L2 through light splitting optical filter 5, the light path of described exciting light L1 is direct-injection type, the fluorescence L2 that described fluorescent material layer 4 sends transfers back to light splitting optical filter 5 by optical fiber 1, described fluorescence L2 reflexes to isolation optical filter 7 through light splitting optical filter 5, and the light path of described fluorescence L2 bends to arbitrarily angled.
In the present embodiment two, the cutoff wavelength of described light splitting optical filter 5 is more than wavelength of fluorescence.The light channel structure of this single fiber formula fluorescent optical fiber sensor also comprises that the exciting light L1 that exciting light source 2 is sent converges on optical fiber 1 front end face and the fluorescence L2 that optical fiber 1 is passed back converges at the coupled lens 6 on photoelectric detector 3 photosurfaces, to improve exciting light L1, enters the coupling efficiency of optical fiber 1 and the receiving efficiency of 3 couples of fluorescence L2 of photoelectric detector.
In two above-mentioned embodiment, described coupled lens 6 is preferably convex lens, but is not limited to this.Due to the light intensity of the exciting light L1 light intensity much larger than fluorescence L2, so photoelectric detector 3 the place aheads are provided with exciting light L1 and fluorescence L2 separately with the isolation optical filter 7 of filtering exciting light L1, reduce to disturb, and improve measuring accuracy; Described isolation optical filter 7 preferred center wavelength are the fluorescent belt pass filter of wavelength of fluorescence wave band, but are not limited to this.
In two above-mentioned embodiment, described exciting light source 2 is preferably LED light emitting diode, but is not limited to this.Described photoelectric detector 3 is preferably PIN photodiode, but is not limited to this.
The foregoing is only preferred embodiment of the present utility model, all equalizations of doing according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (9)
1. the light channel structure of a single fiber formula fluorescent optical fiber sensor, comprise optical fiber, exciting light source and photoelectric detector, it is characterized in that: the front end face of described optical fiber is provided with fluorescent material layer, the exciting light process light splitting optical filter coupled into optical fibres that described exciting light source sends activating fluorescent material layer are to send fluorescence, the fluorescence that described fluorescent material layer sends is got back to light splitting optical filter by optical fiber transmission, described fluorescence is injected into isolation optical filter through light splitting optical filter, described isolation optical filter is transmission fluorescence, the optical filter of reflection exciting light, described fluorescence is transmitted to photoelectric detector through isolation optical filter, described photoelectric detector receives fluorescence and fluorescence is converted to electric signal.
2. the light channel structure of a kind of single fiber formula fluorescent optical fiber sensor according to claim 1, it is characterized in that: described light splitting optical filter is the optical filter of reflection exciting light, transmission fluorescence, exciting light that described exciting light source sends enters optical fiber activating fluorescent material layer to send fluorescence through light splitting optical filter reflection coupling, the light path of described exciting light bends to arbitrarily angled, the fluorescence that described fluorescent material layer sends is got back to light splitting optical filter by optical fiber transmission, described fluorescence is transmitted to isolation optical filter through light splitting optical filter, and the light path of described fluorescence is direct-injection type.
3. the light channel structure of a kind of single fiber formula fluorescent optical fiber sensor according to claim 1, it is characterized in that: described light splitting optical filter is the optical filter of transmission exciting light, reflected fluorescent light, the exciting light process light splitting optical filter transmission coupled into optical fibres that described exciting light source sends activating fluorescent material layer are to send fluorescence, the light path of described exciting light is direct-injection type, the fluorescence that described fluorescent material layer sends is got back to light splitting optical filter by optical fiber transmission, described fluorescence reflexes to isolation optical filter through light splitting optical filter, and the light path of described fluorescence bends to arbitrarily angled.
4. the light channel structure of a kind of single fiber formula fluorescent optical fiber sensor according to claim 1, is characterized in that: also comprise the exciting light that exciting light source is sent converge on optical fiber front end face and the fluorescence that optical fiber is passed back converge on photoelectric detector photosurface coupled lens.
5. the light channel structure of a kind of single fiber formula fluorescent optical fiber sensor according to claim 4, is characterized in that: described coupled lens is convex lens.
6. the light channel structure of a kind of single fiber formula fluorescent optical fiber sensor according to claim 1, is characterized in that: the cutoff wavelength of described light splitting optical filter is below incentive optical wavelength or more than wavelength of fluorescence.
7. the light channel structure of a kind of single fiber formula fluorescent optical fiber sensor according to claim 1, is characterized in that: described isolation optical filter is that centre wavelength is the fluorescent belt pass filter of wavelength of fluorescence wave band.
8. the light channel structure of a kind of single fiber formula fluorescent optical fiber sensor according to claim 1, is characterized in that: described exciting light source is LED light emitting diode.
9. the light channel structure of a kind of single fiber formula fluorescent optical fiber sensor according to claim 1, is characterized in that: described photoelectric detector is PIN photodiode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320296068.XU CN203489893U (en) | 2013-05-28 | 2013-05-28 | Optical path structure of single-fiber fluorescence fiber sensor |
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| CN201320296068.XU CN203489893U (en) | 2013-05-28 | 2013-05-28 | Optical path structure of single-fiber fluorescence fiber sensor |
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| CN203489893U true CN203489893U (en) | 2014-03-19 |
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| CN201320296068.XU Expired - Lifetime CN203489893U (en) | 2013-05-28 | 2013-05-28 | Optical path structure of single-fiber fluorescence fiber sensor |
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- 2013-05-28 CN CN201320296068.XU patent/CN203489893U/en not_active Expired - Lifetime
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Granted publication date: 20140319 |