CN104913796A - Long-distance correlated photoelectric sensor based on aspheric lens - Google Patents
Long-distance correlated photoelectric sensor based on aspheric lens Download PDFInfo
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- CN104913796A CN104913796A CN201510046655.7A CN201510046655A CN104913796A CN 104913796 A CN104913796 A CN 104913796A CN 201510046655 A CN201510046655 A CN 201510046655A CN 104913796 A CN104913796 A CN 104913796A
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Abstract
The invention discloses a long-distance correlated photoelectric sensor based on an aspheric lens. The sensor comprises an emitter and a receiver. In the emitter, a power supply circuit provides power for a single chip microcomputer. The single chip microcomputer emits a pulse signal to an emission driving circuit. The driving circuit drives a LED to carry out pulse emission. A LED emission signal carries out focusing via an emission focusing lens and finally is emitted as approximative parallel light. The receiver receives parallel incident light. Firstly, a receiving focusing lens is used to carry out convergence; when a convergent light signal can be induced by a receiver tube, the receiver tube outputs a receiving signal; the receiving signal is converted into a voltage signal through a receiving circuit; the voltage signal is amplified through a receiving amplification circuit; an amplified signal is sent to the single chip microcomputer so as to carry out threshold comparison. Finally, a switch signal is output and an output circuit is controlled to output.
Description
Technical field
The present invention relates to sensor field, specifically, be related specifically to a kind of remote correlation photoelectric sensor based on non-spherical lens.
Background technology
The design that photoelectricity emission sensor adopts transmitter to be separated with receiver carrys out the detection of realize target object.Receiver is placed on transmitter and launches in light path, and when object to be detected blocks light beam, sensor just can detect.This mode light capacity usage ratio is the highest, and therefore the detecting distance of emission sensor is several times even tens times of diffuse reflection and reflector type sensor.Correlation photoelectric sensor is widely used and it is advantageous that detecting distance is far away, is that other types sensor institute is inaccessiable.
Because the luminous point of transmitting illuminant LED has certain size during actual design, the irrationality of diversing lens design, cause the luminous energy decay of emission sensor very fast, therefore distance is also restricted greatly.Usually based on the designed distance of infrared LED correlation photoelectric sensor between 0-50 rice, usually needing the higher laser sensor of energy compaction measure to realize in the larger use occasion of distance.Therefore the range of application based on the correlation photoelectric sensor of infrared LED is limited by its maximum detecting distance.
The essential structure of photoelectricity opposite type sensor as shown in Figure 1.In the schematic diagram shown in Fig. 1, LED is as the transmitting illuminant in transmitter, and its luminous energy projects receiver region after being focused on by diversing lens, and the luminous energy that transmitter is launched is converged to receiving tube by receiver lens.When having object to block in the middle of transmitter and receiver, receiver detection is less than the luminous energy from transmitter.Receiver determines whether have output by according to the size of receiving tube detection luminous energy.Therefore under such sensor mechanism, the distance sensing of opposite type sensor except the receiving sensitivity of the emissive porwer and receiving tube that depend on power valve, the whether suitable determinative that will be correlation distance of selection of lens.Make a general survey of the development history of photoelectricity opposite type sensor, successively occur that following 2 kinds of lens are as energy accumulating element.
The first photoelectricity opposite type sensor adopts spherical lens as light focusing element.The single-spherical lens of plano-convex structure is generally adopted, as shown in Figure 2 when applying this lens.Adopt this kind of structure substantially can meet the design of the opposite type sensor within 0-30 rice.
The second photoelectricity opposite type sensor adopts Fresnel Lenses, and this kind of lens have another name called Fresnel lens, be by the thin slice of polyolefine material pressure injection mostly, and Fresnel Lenses surface one side is plane, the many ascending concentric circless of another side imprinting.The photoelectricity opposite type sensor system architecture realized by Fresnel Lenses as shown in Figure 3.Adopt this kind of structure substantially can meet the design of the opposite type sensor within 0-50 rice.
The photoelectricity opposite type sensor be made up of the single-spherical lens of plano-convex structure, the quality of its transmitter emergent light depends on single-spherical lens completely.Because the spherical aberration of single-spherical lens is larger.Show for the transmitter of photoelectricity opposite type sensor, the light that LED sends can not effectively be assembled for directional light carries out outgoing by lens, forms the very large angle of divergence, as shown in fig. 4 a.For receiver, the directional light launched by transmitter enters receiver lens, because the spherical aberration of plano-convex spherical lens exists, makes light not converge at same point, causes a lot of light effectively can not be received pipe and receives.
Design proposal traditional in opposite type sensor adopts spherical lens to carry out imaging.He can show outside for a power valve circle halation.Its image quality is undesirable, and spherical aberration is comparatively large, can not effectively be converged by Off-axis-light.The photoelectricity opposite type sensor distance of reaction applying this kind of lens making is near.
The photoelectricity opposite type sensor be made up of Fresnel Lenses has clear improvement compared to its spherical aberration of spherical lens.But for the transmitter of photoelectricity opposite type sensor, its light source is LED, the light projected between two concentrically ringed switchings place certainly will be caused to occur spuious, as shown in Figure 5 a.If the cross section broken line of lens replaces little camber line, also optic error can be brought.In addition due in reality processing, the tip of sawtooth and bottom can not be accomplished infinitely small, but have certain fillet, and this fillet will affect light can not arrive the place that arrive, and causes parasitic light, as shown in Figure 6.Parasitic light number with processing precision relevant.Assuming that the mean breadth of sawtooth is d, the radius of corner of serrated tip is r, and thinks that roughly the light within the scope of r becomes parasitic light, and the ratio of light loss is r/d.Such as sawtooth is wide is 1mm, and machining precision causes r to be 0.05mm, then light loss is 5%.This is the light loss that Fresnel Lenses has to have, and this is also the shortcoming of Fresnel Lenses.Fresnel Lenses on market mostly is the concentric structure of equal difference radius, and it makes and lacks accurate optical design process, causes image quality not to be very high, and the even just simple ripple struction had, its optical quality is just poorer.Even preferably Fresnel Lenses, be also, after usually ordinary lens being divided into segment, be approximately broken line, and through different distance simple translation and formed, the defect in these methods for designing causes the inferior quality of Fresnel Lenses.In the receiver of photoelectricity opposite type sensor, the directional light launched by Fresnel Lenses focusing emitter often occurs that different concentric circless focuses on different distance, and cause receiving tube Received signal strength to be subject to grievous injury, its effect as shown in Figure 5 b.
Summary of the invention
The object of the invention is to for deficiency of the prior art, provide a kind of remote correlation photoelectric sensor based on non-spherical lens, to solve the problem.
Technical matters solved by the invention can realize by the following technical solutions:
Based on a remote correlation photoelectric sensor for non-spherical lens, comprise transmitter and receiver; Described transmitter comprises the first housing, is provided with countdown circuit, launches mirror holder, diversing lens, power valve and the first optical filter in described first housing; The signal output part of described countdown circuit connects power valve, described power valve is arranged on to be launched on mirror holder, described transmitting mirror holder is fixedly installed in the first housing, and be provided with diversing lens at the transmit direction end of power valve, described first optical filter is installed on the outside of diversing lens; Described receiver comprises the second housing, is provided with reception control circuit in described second housing, receives mirror holder, receiver lens, receiving tube and the second optical filter; The signal output part of described reception control circuit connects receiving tube, described receiving tube is arranged on and receives on mirror holder, described reception mirror holder is fixedly installed in the second housing, receiver lens is provided with at the receive direction end of receiving tube, described second optical filter is installed on the outside of receiver lens, and just to the first optical filter of transmitter.
Preferably, described first housing and the mounting hole corner of the second housing offered for being connected.
Preferably, in described first housing and the second housing, pilot lamp is installed.
Preferably, described first housing and the second housing offer the through hole for stube cable.
Compared with prior art, beneficial effect of the present invention is as follows:
1, product function effect: because emission angle is little, parasitic light is few, makes the actual induction using non-spherical lens can realize in 0-150 rice in conjunction with infrared LED correlation photoelectric sensor.Extend the usable range of photoelectricity opposite type sensor greatly.And make to use mutual interference can drop to minimum side by side.
2, jamproof effect: the photoelectricity opposite type sensor based on non-spherical lens designs, and the emission angle of transmitter is little, and the receiving angle equally for receiver also can be effectively controlled.Therefore other angle light launched for non-emitter can play good inhibiting effect.
3, cost-saving effects: by the improvement of optical texture, makes overlength distance photoelectricity opposite type sensor need not depend on laser-correlation sensor, has largely saved customer using cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of photoelectricity opposite type sensor of the present invention.
Fig. 2 is the schematic diagram of spherical lens photoelectricity opposite type sensor of the present invention.
Fig. 3 is the schematic diagram of Fresnel Lenses photoelectricity opposite type sensor of the present invention.
Fig. 4 a is the transmitting schematic diagram of spherical lens photoelectricity opposite type sensor of the present invention.
Fig. 5 a is the transmitting schematic diagram of Fresnel Lenses photoelectricity opposite type sensor of the present invention.
Fig. 5 b is the reception schematic diagram of Fresnel Lenses photoelectricity opposite type sensor of the present invention.
Fig. 6 is the schematic diagram of parasitic light of the present invention.
Fig. 7 is schematic diagram of the present invention.
Fig. 8 a emitter structures schematic diagram of the present invention.
The structural representation of Fig. 8 b receiver of the present invention.
Embodiment
The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
See Fig. 7, a kind of remote correlation photoelectric sensor based on non-spherical lens of the present invention, comprises transmitter and receiver.In the transmitter, power circuit is powered to single-chip microcomputer, and single-chip microcomputer sends pulse signal to launching driving circuit, and driving circuit driving LED carries out impulse ejection.LED transmits and to focus on through transmitting focusing lens, finally to carry out outgoing close to directional light.Receiver receives parallel input light, first converged by collectiong focusing lens, when the light signal converged can be received pipe induction, receiving tube exports Received signal strength, Received signal strength is converted into voltage signal through receiving circuit, and this voltage signal amplifies by receiving amplifying circuit.Signal feeding single-chip microcomputer after amplification carries out threshold value and compares.Final output switching signal, controls output circuit and exports.
See Fig. 8 a, described transmitter comprises the first housing, is provided with countdown circuit, launches mirror holder, diversing lens, power valve and the first optical filter in described first housing; The signal output part of described countdown circuit connects power valve, described power valve is arranged on to be launched on mirror holder, described transmitting mirror holder is fixedly installed in the first housing, and be provided with diversing lens at the transmit direction end of power valve, described first optical filter is installed on the outside of diversing lens.
See Fig. 8 b, described receiver comprises the second housing, is provided with reception control circuit in described second housing, receives mirror holder, receiver lens, receiving tube and the second optical filter; The signal output part of described reception control circuit connects receiving tube, described receiving tube is arranged on and receives on mirror holder, described reception mirror holder is fixedly installed in the second housing, receiver lens is provided with at the receive direction end of receiving tube, described second optical filter is installed on the outside of receiver lens, and just to the first optical filter of transmitter.
This programme uses square casing, and launching and receiving device uses non-spherical lens to carry out light focusing.Wherein non-spherical lens aspherical equation is (with aspheric summit for initial point):
The present invention adopts non-spherical lens to carry out the design of photoelectricity opposite type sensor, and can realize the emitted at small angles of correlation photoelectric sensor, emission maximum angle can control at ± 0.6 °.Such emitted at small angles makes utilizing emitted light energy very concentrated, and being conducive to opposite type sensor distance increases.Emission angle is little simultaneously, makes transmitter have signal area very little in receiver end projection.Such as, be the opposite type sensor of ± 0.6 ° for maximum emission angle, at 100 meters of, launch spot radius r=1.05m.If need transmitter to install side by side, so the minimum 2.1m of the spacing of two transmitters can ensure that the signal between two pairs of opposite type sensor does not disturb.And along with using the reduction of distance sensing, ensure that the minor increment that signal does not disturb also can reduce accordingly.
Core technology point of the present invention comes from the matched design of infrared emission LED and non-spherical lens, and its light-emitting area diameter 2.4mm, light-emitting area is larger under normal circumstances, and luminous intensity could be larger.But light-emitting area is larger, the out of focus light of diversing lens is more, more unfavorable to the focusing of lens.From optical propagation direction optical axis more close to the light of outgoing be more easily launched lens exiting parallel.And from the non-parallel emergent ray away from optical axis, decay very soon after propagation certain distance, can not actual induction be formed.The selection of therefore launching LED surface of emission size must consider diversing lens, if the surface of emission is too small, the emissive porwer that is bound to is inadequate; The surface of emission is excessive, causes the waste of a lot of energy.Through test of many times and analysis, the final HIR67-21C/L11/TR8 selecting hundred million light to produce is as the power valve of this correlation photoelectric sensor.
Infrared emission LED coordinates the emission angle being also embodied in LED whether can coordinate to realize with diversing lens the efficiency utilization of luminous energy with diversing lens.In the present invention, the bore of lens is
focal length of lens f=11.2mm.Lens can receive the half-angle of LED emission of light in the present invention
simultaneously in conjunction with the relation of LED emissive porwer and angle, can calculate and be accounted for the efficiency of launching the total optical radiation energy of LED by the luminous energy of lens focus:
Namely used in the present invention LED and the combination of diversing lens effectively can utilize the luminous energy of LED 64.2%.Utilize this design, can small size be met, the designing requirement of overlength distance photoelectricity opposite type sensor.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (4)
1., based on a remote correlation photoelectric sensor for non-spherical lens, comprise transmitter and receiver; It is characterized in that: described transmitter comprises the first housing, countdown circuit is installed in described first housing, launches mirror holder, diversing lens, power valve and the first optical filter; The signal output part of described countdown circuit connects power valve, described power valve is arranged on to be launched on mirror holder, described transmitting mirror holder is fixedly installed in the first housing, and be provided with diversing lens at the transmit direction end of power valve, described first optical filter is installed on the outside of diversing lens; Described receiver comprises the second housing, is provided with reception control circuit in described second housing, receives mirror holder, receiver lens, receiving tube and the second optical filter; The signal output part of described reception control circuit connects receiving tube, described receiving tube is arranged on and receives on mirror holder, described reception mirror holder is fixedly installed in the second housing, receiver lens is provided with at the receive direction end of receiving tube, described second optical filter is installed on the outside of receiver lens, and just to the first optical filter of transmitter.
2. the remote correlation photoelectric sensor based on non-spherical lens according to claim 1, is characterized in that: described first housing and the mounting hole corner of the second housing offered for being connected.
3. the remote correlation photoelectric sensor based on non-spherical lens according to claim 1, is characterized in that: be provided with pilot lamp in described first housing and the second housing.
4. the remote correlation photoelectric sensor based on non-spherical lens according to claim 1, is characterized in that: described first housing and the second housing offer the through hole for stube cable.
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Cited By (7)
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| CN105716635A (en) * | 2016-02-23 | 2016-06-29 | 西南大学 | Laser transmit-receive sensor with fixed modulation frequency |
| CN105738968A (en) * | 2016-04-08 | 2016-07-06 | 宜科(天津)电子有限公司 | Novel background suppression type photoelectric sensor |
| CN107479105A (en) * | 2017-08-24 | 2017-12-15 | 北京虹电科技有限公司 | A kind of infrared detecting device based on LoRa |
| CN110296723A (en) * | 2019-07-05 | 2019-10-01 | 上海托菲机电科技有限公司 | A kind of coding/decoding method of anti-its decoder of sunlight wide angle photoelectric sensor |
| CN111487768A (en) * | 2020-04-24 | 2020-08-04 | 北京控制工程研究所 | Energy collection optical system based on aspheric lens group |
| CN112923848A (en) * | 2021-01-25 | 2021-06-08 | 上海兰宝传感科技股份有限公司 | Correlation type laser size measurement sensor |
| CN115800986A (en) * | 2023-02-01 | 2023-03-14 | 昆明理工大学 | High-efficient correlation type photoelectric switch based on non-imaging spotlight effect |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105716635A (en) * | 2016-02-23 | 2016-06-29 | 西南大学 | Laser transmit-receive sensor with fixed modulation frequency |
| CN105738968A (en) * | 2016-04-08 | 2016-07-06 | 宜科(天津)电子有限公司 | Novel background suppression type photoelectric sensor |
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| CN110296723A (en) * | 2019-07-05 | 2019-10-01 | 上海托菲机电科技有限公司 | A kind of coding/decoding method of anti-its decoder of sunlight wide angle photoelectric sensor |
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| CN111487768B (en) * | 2020-04-24 | 2022-03-04 | 北京控制工程研究所 | Energy collection optical system based on aspheric lens group |
| CN112923848A (en) * | 2021-01-25 | 2021-06-08 | 上海兰宝传感科技股份有限公司 | Correlation type laser size measurement sensor |
| CN112923848B (en) * | 2021-01-25 | 2022-05-24 | 上海兰宝传感科技股份有限公司 | Correlation type laser size measurement sensor |
| CN115800986A (en) * | 2023-02-01 | 2023-03-14 | 昆明理工大学 | High-efficient correlation type photoelectric switch based on non-imaging spotlight effect |
| CN115800986B (en) * | 2023-02-01 | 2023-05-23 | 昆明理工大学 | High-efficiency correlation photoelectric switch based on non-imaging condensation function |
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Application publication date: 20150916 |