CN101286656B - Laser long-distance excitation fluorescence energy supply method and device of wireless sensor network - Google Patents
Laser long-distance excitation fluorescence energy supply method and device of wireless sensor network Download PDFInfo
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- CN101286656B CN101286656B CN2008100697636A CN200810069763A CN101286656B CN 101286656 B CN101286656 B CN 101286656B CN 2008100697636 A CN2008100697636 A CN 2008100697636A CN 200810069763 A CN200810069763 A CN 200810069763A CN 101286656 B CN101286656 B CN 101286656B
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Abstract
The invention relates to a method and device used for stimulating fluorescence by laser to supply power for a wireless sensor network far away. The method adopts a high power laser as an energy sourceand utilizes laser beams to transmit the energy to the working space of the wireless sensor network far away. A fluorescent element or a plurality of fluorescent elements are arranged at working places which can be irradiated by the laser. Each fluorescent element emits the fluorescence after being stimulated by the laser to a space with a steradian nearly close to 2pi, thus forming a space fullofillumination at the working places of the whole wireless sensor network, ensuring that wireless sensor modules at any positions within the space can obtain luminous energy and the luminous energy isconverted into electrical power by inverting elements carried by the wireless sensor modules to drive the sensors. The invention eliminates the requirements on the intervisibility of the sensor andthelaser, maintains the installing flexibility of the wireless sensor, changes the existing one-to-one working mode of the laser and the sensor, realizes supplying the power to a plurality of sensorsbyone laser and authentically realizes the active luminous energy supply of the wireless sensor network under the condition of obturation or sheltering.
Description
Technical field
The invention belongs to the wireless senser field, be specifically related to the remote laser energy supply technology of wireless senser.
Background technology
Wireless senser is a research focus in moment sensor field, and wherein the energy supply problem of wireless senser is the bottleneck of restriction wireless sensor network development all the time.Initial wireless senser all adopts battery-powered basically; In order to prolong the service time of battery, a large amount of in recent years research concentrates on the Energy Saving Control algorithm of sensor network; In any case but energy-conservation, battery is to need to change all the time; Therefore these researchs fundamentally do not solve the energy supply problem of wireless senser.
In recent years, the researcher begins diversion to the self energizing of wireless senser.Various power conversion acquisition equipments are devised, and as luminous energy (especially solar energy), heat energy, mechanical energy, electromagnetic wave, nuclear energy etc., nearly all form of energy all is converted into electric energy and offers wireless senser.Therefore catching and utilize the energy in the environment is the most attractive wireless senser self energizing mode.But in some extreme application scenario, environmental energy often can't obtain.In this case, often need transducer is carried out the active energy supply.Thereby, we can say that initiatively energy supply is a necessary complement of environment energy supply.Initiatively energy supply need be concentration of energy and directivity is arranged is offered transducer, considers the characteristics of various power transfer, and luminous energy is that the easiest realization is concentrated, the energy of directional transmissions, so the laser energy supply of wireless senser becomes one of important content of self energizing research.
The wireless senser laser energy supply mainly contains surround lighting energy supply, optical fiber energy supply and three kinds of modes of laser far-distance energy supply at present.In the surround lighting energy supply scheme, energy is provided by sunlight or other artificial light sourcess, and energy acquisition and switching device adopt photocell.It still is a kind of self energizing mode of gathering environmental energy in essence, can not be operated in the occasion that does not have illumination; In addition, photronic conversion efficiency is low, volume is big, has limited its application greatly.The optical fiber energy-provision way, energy is provided by laser or LED, optical fiber is as transport vehicle, luminous energy is sent to sensing station, energy acquisition and switching device can adopt photocell or photodiode, but the optical fiber energy supply has become wireless senser into wired sensor, has lost the flexibility of wireless senser; And the antijamming capability of electrical sensor is not as real Fibre Optical Sensor, thus the wireless senser of optical fiber energy supply with the competition of Fibre Optical Sensor in be in a kind of difficult situation.The laser far-distance energy supply is another kind of more common wireless senser laser energy supply mode.The principle of the long-range energy supply of existing laser as shown in Figure 1, laser 1-1 sends laser beam 1-2, shine directly on the wireless sensor module 1-4 at a distance, the power conversion device on the module 1-4 is converted into electric energy with luminous energy, and is whole sensor module 1-4 power supply.Adopt this energy-provision way, the concentration of energy of laser goes up on one point, so the energy conversion efficiency of the power conversion device on the transducer 1-4 do not need very highly, just can obtain enough electric energy, drives whole module.This method has two unsurmountable shortcomings:
1. need intervisibility between transducer and the laser, if there is barrier (1-3) to block laser, then module 1-4 can not obtain energy, and this shortcoming has seriously limited the long-range energy supply of laser and used in the space of blocking is arranged.
2. as shown in Figure 1, laser and wireless sensor module are 1 pair 1; If laser beam does not scan, then sensor assembly 1-5 can not obtain energy; That is to say that existing laser pumping energy-provision way can not be realized the energy supply to wireless sensor network.
Yet wireless senser is than the major advantage of wired sensor just for flexible arrangement and easy formation distributed measurement network, and existing laser energy-provision way can not satisfy two requirements, and its application is subjected to greatly limiting.Therefore at confined space or block under the condition, how to utilize laser to realize the remote transmission of energy, realize that the multisensor laser energy supply is a difficult problem of academia and industrial circle common concern simultaneously.
Summary of the invention
Purpose of the present invention is just in order to solve the difficult problem of wireless sensor network laser energy supply, and the long-distance activating fluorescent with laser energy supply method of a kind of wireless sensor network that proposes, and design simultaneously realizes the laser pumping fluorescence power supply device of this method.
The objective of the invention is to realize by the following technical solutions:
The present invention proposes the long-distance activating fluorescent with laser energy supply method of wireless sensor network, this method adopts a high power laser as the energy, utilize concentrated, the characteristics such as collimation is good, good directionality of laser beam energy, energy is sent at a distance the working space of wireless sensor network.Space structure according to the wireless senser service position, in this working space, the place that can be arrived by laser radiation installs (or several) fluorescent element, each fluorescent element sends fluorescence under the excitation of laser, and near the space of 2 π surface of spheres emitting fluorescence; Form a space that is full of illumination like this in whole wireless sensor network service position, the wireless sensor module of optional position all can obtain luminous energy in the space; Wireless sensor module carries inverting element with transform light energy electric energy and driving sensor work.This method is similar to the fluorescent lamp that the energy supply of (or a plurality of) laser has been installed on the wireless sensor network service position, in the time of work, utilize laser far-distance to light these fluorescent lamps and illumination is provided, realizes energy supply promptly can for the interior wireless senser of whole sensor network.
In order to realize said method, the present invention has designed a kind of long-distance activating fluorescent with laser power supply device of wireless sensor network, and it comprises that a laser, one have the airtight or accurate confined space of aperture, a plurality of fluorescent element and a plurality of wireless sensor module.Wherein, described fluorescent element and wireless sensor module are arranged in the airtight or accurate confined space, form the wireless sensor network working space; The aperture of described airtight or accurate confined space and the laser beam incident direction of laser can see through aperture on the confined space over against, laser and be shining into and penetrate; First fluorescent element is installed in the position that can be shone by laser, and this fluorescent element absorbs a part of laser, and remaining laser sees through this fluorescent element and shines second fluorescent element, and promptly second fluorescent element is installed on the transmitted light path of first fluorescent element; In like manner, second fluorescent element also absorbs a part of laser, and sees through a part of rayed the 3rd fluorescent element.A plurality of fluorescent elements arrange that in regular turn all fluorescent elements send fluorescence, illuminate whole confined space, all wireless sensings that are provided with in the space by above-mentioned position relation.The device module all is illuminated, and wireless sensor module carries inverting element with the transform light energy electric energy, and driving sensor work.
As the fluorescent element of wireless sensor network local light source, comprise prism, waveguide plate and an element such as fluorescent back plate that scribbles fluorescent material.Prism can reflect into part light into waveguide plate, and allows another laser refraction go out, and shines another fluorescent element; The effect of waveguide plate is to allow laser shine uniformly on the fluorescent back plate, produces uniform fluorescence.
Because the energy of laser beam is more concentrated, the collection of energy ability and the photoelectric conversion efficiency of the inverting element on the wireless sensor module there is not strict requirement at existing laser far-distance power supply device.Adopt long-distance activating fluorescent with laser energy supply method of the present invention, the power conversion of laser becomes the energy of fluorescence, and be dispersed in the whole working space, the luminous energy that each transducer obtains becomes very little, and therefore collection of energy ability and the conversion efficiency to inverting element proposed very high requirement; For this reason, the present invention has also designed the high efficiency light electric transducer.This transducer comprises that the hemisphere face concentrator that can collect luminous energy in 2 π surface of sphere spaces and one do not have the bias lighting electric diode efficiently; The hemisphere face concentrator has increased light-receiving area, and the photoelectric conversion efficiency of photodiode is again greater than photocell, and therefore the efficient of this energy converter is than photocell height.
The present invention has kept wireless, the remote advantage of existing laser far-distance energy-provision way, compensates its defect; At first, eliminate transducer and the requirement of laser intervisibility, kept the wireless senser installation flexibility; In addition, changed existing laser and transducer mode of operation one to one, realized that really a laser is to a plurality of transducer energy supplies; The long-distance activating fluorescent with laser energy supply method of the present invention design has really been realized airtight or block the active laser energy supply of the wireless sensor network under the condition like this.
Description of drawings
Fig. 1 is the laser far-distance energy supply principle schematic of existing wireless senser;
Fig. 2 is a kind of embodiment schematic diagram of the present invention;
Fig. 3 is the fluorescent element structure chart in the present embodiment;
Fig. 4 is the high efficiency transducer architecture schematic diagram in the present embodiment.
Embodiment
The present invention is further elaborated below in conjunction with accompanying drawing:
Referring to Fig. 2, the long-distance activating fluorescent with laser power supply device of the wireless sensor network of the present invention's design comprises laser 2-1, airtight working space 2-3, the wireless sensor module 2-4 that has high efficiency transducer, the first fluorescent element 2-5-A, the second fluorescent element 2-5-B and the 3rd fluorescent element 2-5-C, barrier 2-8.Described fluorescent element and wireless sensor module are arranged in the airtight or accurate airtight working space, form the working space of wireless sensor network, on the described airtight or accurate confined space 2-3 aperture 2-2 is arranged, the laser beam 2-5-2 incident direction of aperture 2-1 and laser 2-1 over against, the light beam that laser 2-1 sends can incide in the airtight working space 2-3 by this aperture 2-2.The first fluorescent element 2-5-A is installed in the position that can be shone by incident laser, absorb a part of laser to send fluorescence, the remainder of transmission simultaneously laser, the second fluorescent element 2-5-B is installed on the transmitted light path of the first fluorescent element 2-5-A, also absorb an a part of transmission part, the 3rd fluorescent element 2-5-C is installed in again on the transmitted light path of the second fluorescent element 2-5-B, three fluorescent elements are arranged in regular turn by above-mentioned position relation, fluorescent element sends fluorescence, illuminate whole working space, all wireless sensor module in the working space carry inverting element, with the transform light energy electric energy, and driving sensor work.
As shown in Figure 3, fluorescent element 2-5 comprises prism 2-5-1, waveguide plate 2-5-3, three elements such as fluorescent back plate 2-5-5, incident laser light beam 2-5-2 is in first surface reflection of prism 2-5-1, enter the waveguide plate 2-5-3 on the reflected light path that is arranged on prism, light repeatedly reflects in waveguide plate 2-5-3 and evenly shines on the fluorescent back plate 2-5-5 that is arranged on the waveguide plate back side, and the activating fluorescent material sends fluorescence; Another part laser reflects away through prism 2-5-1 and illuminates another fluorescent element.
The high efficiency transducer of wireless sensor module 2-4 as shown in Figure 4.At spherical lens 2-4-2 of the optical fiber 2-4-3 of conventional large-numerical aperture end face sintering, further increase numerical aperture, improve it and receive luminous energy power; Then a large amount of this optical fiber arrangements is got up to form the concentrator in a hemisphere space; Like this, the light 2-4-1 that shines from all directions all can enter the optical fiber 2-4-3 by this concentration structure, forms light conducting 2-4-4, and shines on the working face of photodiode 2-4-5 by the end face of optical fiber.Photodiode plan employing plan employing external quantum efficiency can reach the no bias lighting electric diode more than 80%.Like this, the hemisphere face concentrator has increased light-receiving area, and the conversion efficiency of photodiode is again greater than photocell, and therefore the efficient of this energy converter is than photocell height.
In the time of work, laser 2-1 sends the collimated light beam of high energy energy, enter in the 2-3 of space by the aperture 2-2 on the airtight working space 2-3, and shine on the first fluorescent element 2-5-A, this fluorescent element absorbs a part of laser, and remaining laser 2-7 sees through this fluorescent element and shines the second fluorescent element 2-5-B; In like manner, the second fluorescent element 2-5-B also absorbs a part of laser, and sees through a part of rayed the 3rd fluorescent element 2-5-C.Three fluorescent elements send fluorescence 2-6 under the excitation of laser, illuminate whole confined space 2-3, three wireless senser mould 2-4 pieces in the space all are illuminated, the high efficiency transducer that wireless sensor module 2-4 carries collects fluorescent energy and is converted into electric energy, and driving sensor 2-4 work.In the device for carrying out said of the present invention's design, although the working space 2-3 of wireless senser 2-4 is airtight, and there is barrier 2-8 inside, and laser can not shine directly on each transducer 2-4, but each transducer 2-4 still can obtain energy by the fluorescence 2-6 that laser pumping gets up.
The present invention has like this eliminated the intervisibility requirement between wireless senser 2-4 and the laser 2-1, has kept wireless senser 2-4 installation flexibility; Simultaneously, the present invention has also changed existing laser 2-1 and transducer 2-4 mode of operation one to one, has realized that really a laser 2-1 gives a plurality of transducer 2-4 energy supply; Reached confined space or the carrying out of blocking the wireless sensor network under the condition purpose of laser energy supply initiatively.
Although the present invention is primarily aimed at wireless senser active laser energy supply and designs, yet application of the present invention is not limited to the wireless senser field, can be generalized to the application scenario that other need multiple spot, remote laser energy supply.Secondly, although embodiment of the present invention has adopted prism, waveguide plate and fluorescent back plate to make fluorescent element, adopt the end face sintering to have the large-numerical aperture optical fiber-concentrator of concave-sphere to add no bias lighting electric diode and make the high efficiency light electric transducer, still can utilize other method, other optical elements to make fluorescent element and light electric transducer; In addition, although the embodiment of the invention has adopted three fluorescent elements and three wireless sensers, still can adopt a plurality of fluorescent elements and a plurality of wireless senser according to concrete instructions for use, thereby realize the present invention and do not deviate from defined essence of the present invention and scope in claims.
Claims (5)
1. the long-distance activating fluorescent with laser energy supply method of wireless sensor network, it is characterized in that: this method is to adopt a high power laser as the energy, utilize laser beam energy to be sent at a distance in the working space of wireless sensor network, described working space is confined space surely, space structure according to the wireless sensor network service position, in described working space can by laser radiation to the place one or more fluorescent elements are installed, each fluorescent element sends fluorescence under the excitation of laser, and near the working space of 2 π surface of spheres emitting fluorescence, form a space that is full of illumination like this in whole wireless sensor network service position, make the wireless sensor module of optional position in the space all can obtain luminous energy, the inverting element that carries by wireless sensor module is with transform light energy electric energy and driving sensor work.
2. realize the long-distance activating fluorescent with laser power supply device of the wireless sensor network of the described method of claim 1, it is characterized in that: described device comprises that a laser, one have the accurate confined space of aperture, a plurality of fluorescent element, a plurality of wireless sensor module; Wherein, described fluorescent element and wireless sensor module are arranged in the accurate confined space, form the working space of wireless sensor network, the laser beam incident direction of the aperture of described accurate confined space and laser over against, first fluorescent element is installed in the position that can be shone by incident laser, absorb a part of laser to send fluorescence, the remainder of transmission simultaneously laser, second fluorescent element is installed on the transmitted light path of first fluorescent element, also absorb an a part of transmission part, the 3rd fluorescent element is installed in again on the transmitted light path of second fluorescent element, and a plurality of fluorescent elements arrange in regular turn that by above-mentioned position relation fluorescent element sends fluorescence, illuminate whole working space, all wireless sensor module in the working space carry inverting element, with the transform light energy electric energy, and driving sensor work.
3. the long-distance activating fluorescent with laser power supply device of wireless sensor network according to claim 2, it is characterized in that: described fluorescent element comprises prism, waveguide plate and scribbles the fluorescent back plate of fluorescent material; Described prismatic reflection part laser, the remainder of transmission simultaneously laser; Described waveguide plate is arranged on the reflected light path of prism, and the back side of waveguide plate is provided with fluorescent back plate, produces uniform fluorescence.
4. according to the long-distance activating fluorescent with laser power supply device of claim 2 or 3 described wireless sensor networks, it is characterized in that: include a hemisphere face concentrator and photodiode on the described wireless sensor module, described hemisphere face concentrator is the spherical lens of fiber end face sintering at conventional large-numerical aperture, be the center with the same point then and line up with identical radius a large amount of this optical fiber, spherical lens by all fiber end faces forms a hemisphere face concentrator jointly, by the hemisphere face concentrator light is transmitted on the working face of described photodiode.
5. the long-distance activating fluorescent with laser power supply device of wireless sensor network according to claim 4 is characterized in that: described photodiode adopts external quantum efficiency to reach no bias lighting electric diode more than 80%.
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| CN102128812B (en) * | 2010-12-29 | 2013-05-15 | 重庆大学 | Laser remote energy supply-based device and method for detecting trace gas |
| CN103090195A (en) * | 2011-11-07 | 2013-05-08 | 奇想创造事业股份有限公司 | Light remote excitation lamp group with directionality |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004055498A1 (en) * | 2004-11-17 | 2006-03-16 | Jahn, Alfred, Dipl.-Ing. (Fh) | Laser`s radiation energy transmitting arrangement, has transmitter converting electrical energy into laser radiation, and optical components of moving system form channel in laser radiation bundle, which is controlled on energy converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102004055498A1 (en) * | 2004-11-17 | 2006-03-16 | Jahn, Alfred, Dipl.-Ing. (Fh) | Laser`s radiation energy transmitting arrangement, has transmitter converting electrical energy into laser radiation, and optical components of moving system form channel in laser radiation bundle, which is controlled on energy converter |
Non-Patent Citations (2)
| Title |
|---|
| 涂以鹏，许文海，杨明伟等.激光供能在光电互感器中的应用.仪器仪表学报26 8.2005,26(8),158-160,163. |
| 涂以鹏，许文海，杨明伟等.激光供能在光电互感器中的应用.仪器仪表学报26 8.2005,26(8),158-160,163. * |
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