CN114550080A - Lighting barrier detection system and method for street lamp and cleaning system - Google Patents

Lighting barrier detection system and method for street lamp and cleaning system Download PDF

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Publication number
CN114550080A
CN114550080A CN202210041681.0A CN202210041681A CN114550080A CN 114550080 A CN114550080 A CN 114550080A CN 202210041681 A CN202210041681 A CN 202210041681A CN 114550080 A CN114550080 A CN 114550080A
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China
Prior art keywords
light
optical window
light intensity
receiver
intensity
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王加义
郑艺扬
陆启荣
冯诚波
戚奇卫
周甄
柳晖
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Zhejiang Gaoxin Technology Co Ltd
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Zhejiang Gaoxin Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/72—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps in street lighting

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Abstract

The invention discloses a lighting barrier detection system, a method and a cleaning system for a street lamp, wherein the detection system comprises: an external light source for emitting first outgoing light; a luminaire assembly comprising: the optical window is a light-transmitting structure and is provided with a first side and a second side; the first light receiver is arranged on the first side of the optical window and used for receiving the first emergent light passing through the optical window and outputting the first light intensity of the received first emergent light; the second light receiver is arranged on the second side of the optical window and used for receiving the first emergent light and outputting third light intensity of the received first emergent light; a processor electrically connected to the second light receiver and the illuminator assembly for receiving the first light intensity and the third light intensity. The invention can realize the detection and removal of the obstacles on the street lamp in multiple occasions.

Description

Lighting obstacle detection system and method for street lamp and cleaning system
Technical Field
The invention relates to the field of obstacle detection, in particular to a lighting obstacle detection system and method for a street lamp and a cleaning system.
Background
Outdoor street lamps, as an important infrastructure for urban lighting, are covered by fallen leaves, snow, dirt, dust, insects, and the like in the air due to the special environment. Due to the influence of the obstacles, the use efficiency of the street lamp may be affected by the shielded illuminator, which brings inconvenience to pedestrians and vehicles. Furthermore, the street light optical window is unnecessarily cleaned, which may consume a large and unnecessary amount of manpower and material resources.
Disclosure of Invention
In order to solve the technical problems, the invention provides a lighting obstacle detection system for a street lamp, which can realize the detection of obstacles on the street lamp in multiple occasions. The invention also provides a cleaning system for removing obstacles.
The invention adopts the following technical scheme:
an illuminated obstacle detection system for a street light, comprising: an external light source for emitting first outgoing light; a luminaire assembly comprising: the optical window is a light-transmitting structure and is provided with a first side and a second side; the first light receiver is arranged on the first side of the optical window and used for receiving the first emergent light passing through the optical window and outputting the first light intensity of the received first emergent light; the second light receiver is arranged on the second side of the optical window and used for receiving the first emergent light and outputting third light intensity of the received first emergent light; and the processor is electrically connected with the second light receiver and the illuminator assembly and used for receiving the first light intensity and the third light intensity.
An illuminated obstacle detection system for a street light, comprising: a luminaire assembly comprising: the optical window is a light-transmitting structure and is provided with a first side and a second side; the illuminator is arranged on the first side of the optical window and used for emitting second emergent light; the first light receiver is arranged on the first side of the optical window and used for receiving the second emergent light and outputting the second light intensity of the received second emergent light; the second light receiver is arranged on the second side of the optical window and used for receiving the second emergent light passing through the optical window and outputting fourth light intensity of the received second emergent light; and the processor is electrically connected with the second light receiver and the illuminator assembly and used for receiving the second light intensity and the fourth light intensity.
An illuminated obstacle detection system for a street light, comprising: an external light source for emitting first outgoing light; a luminaire assembly comprising: the optical window is a light-transmitting structure and is provided with a first side and a second side; the illuminator is arranged on the first side of the optical window and used for emitting second emergent light; the first light receiver is arranged on the first side of the optical window and used for receiving the first emergent light penetrating through the optical window and the second emergent light and outputting fifth light intensity of the received light; the second light receiver is arranged on the second side of the optical window and used for receiving the first emergent light and the second emergent light passing through the optical window and outputting sixth light intensity of the received light; a processor electrically connected to the second light receiver and the illuminator assembly for receiving the fifth and sixth light intensities.
Preferably, the illuminator assembly and the second light receiver are arranged on the same side of the external light source, and second emergent light emitted by the illuminator is received by the second light receiver after passing through the optical window and being reflected by the object.
Preferably, the illuminator and the first light receiver are arranged on the same side of the optical window, and the first light receiver is used for receiving the second emergent light reflected by the optical window and outputting the second light intensity of the received second emergent light.
Preferably, the luminaire assembly further comprises a temperature sensor for detecting the temperature of the first light receiver.
An obstacle cleaning system includes a lighting obstacle detection system for a street light, and further includes a plurality of nozzles directed toward an optical window, the nozzles removing obstacles by means of air or water jets upon detection of an obstacle.
A lighting obstacle detection method for a street lamp, comprising the steps of:
s100: judging whether an external light source is available, and if so, entering S200; if not, entering S400;
s200: the illuminator is in a closed state, and collected light intensity of the first light receiver and the second light receiver is collected;
s300: judging whether a shelter exists on the optical window by judging the light intensity change values of the two, and entering S400 if no shelter exists;
s400: turning on the illuminator, and collecting the collected light intensities of the first light receiver and the second light receiver; s500: judging whether a shelter exists on the optical window by judging the light intensity change values of the two;
s700: and repeating the steps after a certain time interval or continuously repeating the steps.
Preferably, the method further comprises the step of S600: opening the barrier cleaning system to remove the barrier on the optical window; the S300 further includes: if the shielding object exists, the step S600 is carried out; the S500 further includes: if the obstruction exists, the process proceeds to S600.
Preferably, the specific method for determining whether the blocking object exists is as follows, wherein in two adjacent detections:
if the first light intensity change value collected by the first light receiver is greater than the threshold value and the third light intensity change value collected by the second light receiver is less than the threshold value, the existence of a shelter is indicated;
if the second light intensity variation value collected by the first light receiver is greater than the threshold value and the fourth light intensity variation value collected by the second light receiver is greater than the threshold value, the existence of the shielding object is indicated.
Compared with the prior art, the invention has the following advantages: the invention can realize the detection and removal of the obstacles on the street lamp in multiple occasions. Specifically, the invention can realize the detection of the barrier on the street lamp in the day, at night or on cloudy days; meanwhile, the detection of small obstacles can be realized through the cooperation of an external light source and the illuminator. Moreover, the influence of some unnecessary light sources (such as vehicle lights or building lights in the daytime) on the detection result can be eliminated.
In addition, the light intensity is detected through the temperature sensor, and the detection result is accurate; the current and voltage of the luminaire are also measured by the measurement circuit, the corresponding light intensity being determined by the shift of the IV curve.
Drawings
FIG. 1 is a block diagram of the present invention.
Fig. 2 is a schematic view of the structure of example 1 without obstacles.
Fig. 3 is a schematic structural view of the case of an obstacle according to embodiment 1.
Fig. 4 is a schematic view of the structure of example 2 without obstacles.
Fig. 5 is a schematic structural view of embodiment 2 with an obstacle.
Fig. 6 is a schematic view of the structure of example 3 without obstacles.
Fig. 7 is a schematic structural view when an obstacle is present according to embodiment 3.
FIG. 8 is a flowchart of example 3.
FIG. 9 is a schematic structural view of example 5.
Fig. 10 is the IV graph of example 5.
Fig. 11 is a schematic diagram of a luminaire assembly.
Fig. 12 is a schematic view of the structure of the cleaning system.
In the figure, an external light source 1, a first outgoing light 11, a luminaire assembly 2, an optical window 21, a luminaire 22, a second outgoing light 221, a first light receiver 23, a temperature sensor 24, a second light receiver 3, a processor 4, a first IV curve 5, a second IV curve 6.
Detailed Description
In order to facilitate understanding of the technical solutions of the present invention, the following detailed description is made with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the illuminated obstacle detection system may include a processor, sensors, actuators that actuate various street light components, and one or more luminaire assemblies. The processor may communicate with a remote computer over a network. The processor has a memory built in. The memory includes one or more forms of computer-readable media and stores instructions that are executable by the processor to perform various operations.
The actuator typically includes electronic and electromechanical components configured to actuate the illuminator and the light sensor in the illuminator assembly. For example, the actuator may comprise electronic components arranged in a circuit to turn the luminaire on and off.
One or more objects may be present in the environment near the street light. For example, the environment may include stationary objects such as roads, or pedestrians, animals, and the like.
The environment near the street light may also include one or more external light sources. External light sources close to the street lamps are used herein to detect the presence of obstacles, which may affect the light intensity collected by the respective light sensors. Such as the sun, vehicle lights, or building lights, etc.
The network represents one or more mechanisms by which the processor may communicate with remote computers. Thus, the network can be one or more of a variety of wired or wireless communication mechanisms, including wired (e.g., cable and fiber optics) and/or wireless (e.g., cellular, wireless, satellite, microwave, and radio frequency) communication mechanisms. Exemplary communication networks include wireless communication networks (e.g., using bluetooth, Bluetooth Low Energy (BLE), IEEE802.11, street lamp-to-street lamp (V2V) such as Dedicated Short Range Communication (DSRC), etc.), Local Area Networks (LANs), and/or Wide Area Networks (WANs), including the internet, to provide data communication services.
The processor may receive various data, such as image data, from the light sensor. The image data is digital image data, e.g. comprising pixels having intensity and color values, which can be acquired by the second light receiver.
The image data may be provided to a classifier. The classifier has conventional image classification techniques in the prior art. For example, the classifier may use machine learning techniques, where images of various objects, external light sources, and their physical features may be provided to a machine learning program for training the classifier. The training images may be provided by images collected from street lamps or other sources.
Example 1
As shown in fig. 2, an illumination obstacle detection system for a street lamp includes:
an external light source 1 for emitting first outgoing light 11;
luminaire assembly 2, comprising:
an optical window 21, which is a light-transmitting structure and has a first side and a second side;
a first light receiver 23 disposed at a first side of the optical window 21, for receiving the first outgoing light 11 passing through the optical window 21 and outputting a first light intensity of the received first outgoing light 11;
the second light receiver 3 is arranged at the second side of the optical window 21 and is used for receiving the first emergent light 11 and outputting third light intensity of the received first emergent light 11;
a processor 4 electrically connected to the second light receiver 3 and the illuminator assembly 2 for receiving the first light intensity and the third light intensity.
When no shielding object exists outside the optical window 21, the first outgoing light 11 emitted by the external light source 1 passes through the optical window 21 to reach the first light receiver 23, and the first light receiver 23 receives the first outgoing light 11 and outputs first light intensity; meanwhile, the first emergent light 11 emitted by the external light source 1 reaches the second light receiver 3, the second light receiver 3 receives the first emergent light 11 and outputs third light intensity, at this time, because the first emergent light 11 received by the second light receiver 3 is direct light, the first emergent light 11 received by the first light receiver 23 is light passing through the optical window 21, and part of the light is reflected on the surface of the optical window 21, the third light intensity is greater than the first light intensity.
When there is a shielding object outside the optical window 21, the first light intensity of the first outgoing light 11 received by the first light receiver 23 is reduced or even eliminated due to the existence of the shielding object; the second light receiver 3 is disposed on a second side (i.e. an outer side) of the optical window 21, and is not affected by the presence of the shielding object, so that the third light intensity of the first outgoing light 11 received by the second light receiver 3 is not changed.
The detection process may be set to be continuous or repeated after a number of time intervals.
Preferably, the detection process is set to detect once every 15 minutes.
In summary, therefore, it is only necessary to judge: in the two consecutive detection results, the first light intensity of the detection result at the next time is reduced by a larger amplitude and even becomes zero, and the third light intensity is hardly changed, which indicates that an obstacle exists on the optical window 21 and the obstacle removal is required.
In the present embodiment, the case of strong sunlight in the daytime is mainly considered, wherein the external light source 1 is sunlight.
The optical window 21 is defined as a substantially transparent cover for an optical system designed to protect optical components, such as the interior, from the external environment. In practical use, the optical window 21 may be a light-transmitting cover of a street lamp.
The first light receiver 23 may be a light sensor for sensing the intensity of light and converting the intensity into a corresponding electrical signal to be transmitted to the processor 4.
The second light receiver 3, which may be a camera with a light sensor, senses the intensity of the light and converts the intensity into a corresponding electrical signal to be transmitted to the processor 4.
The processor 4 of this embodiment may be an execution element with a processing function, such as a single chip microcomputer.
Preferably, the illuminator assembly 2 and the second light receiver 3 are disposed on the same side of the external light source 1, so as to ensure that the first outgoing light 11 emitted from the external light source 1 can be received by the first light receiver 23 and the second light receiver 3 at the same time. In practical use, the illuminator assembly 2 and the second light receiver 3 are simultaneously arranged on the lamp post of the street lamp, so as to receive sunlight simultaneously.
The processor 4 may be further configured to detect whether the current sunlight is available, that is, whether the intensity of the current sunlight is sufficient for detecting the obstacle. Specifically, if the intensity of the sunlight is weak, the influence of the presence of the obstacle on the first light intensity is small, and the determination cannot be accurately performed, so that the sunlight can be detected after reaching a certain intensity. The specific detection mode is that the second light receiver 3 is used for sensing the intensity of the sunlight and converting the intensity into a corresponding electric signal to be transmitted to the processor 4, the processor 4 judges that the detection is carried out if the intensity of the sunlight is greater than the light intensity threshold value, and the detection is carried out if the intensity of the sunlight is less than the light intensity threshold value, and whether an obstacle exists is detected in other modes.
The predetermined light intensity threshold may be determined, for example, empirically. Assuming that, when an obstacle exists, the intensity of the first outgoing light 11 is reduced by 10% by being affected by the obstacle when passing through the optical window 21, and for accurate detection, the accuracy with which the first light receiver 23 can recognize is set to 2lux, so long as the light intensity of the sunlight is equal to or greater than 20lux, the detection can be performed as long as the third light intensity detected by the second light receiver 3 is equal to or greater than 20 lux.
Preferably, a light sensor (photodiode) is used to detect light intensity, producing a current that increases as the light intensity received by the light sensor increases. In this embodiment, a reverse bias photosensor is required. In this mode of use, the user can,current I through the photosensor when reverse bias is appliedPhotodiodeThe following can be calculated according to equation 4:
Iphotodiode＝IDarkness+IBright Light (LIGHT) (4)
Current IDarknessIs the small (typically less than one nanoamp) current that flows when the photosensor is operated in the dark. I.C. ABright Light (LIGHT)Is the current flowing through the light sensor due to illumination, for example, when light is applied to the light sensor. Current I of the light sensorDarknessTypically with temperature. Generally, the current I is 10 ℃ per temperature riseDarknessThe value of (c) is doubled.
Wherein the processor 4 may be arranged to determine the current I based on a determination at a specified temperature (e.g. at 25 ℃)DarkAnd adjusting the current I based on the actual temperature of the light sensorDarkness. I.e. based on a current I known (by measurement or specification) at a first temperature T1Dark T1Dark current I at a second temperature T2Dark T2The following can be calculated based on equation 5:
Figure BDA0003470503440000081
the luminaire assembly 2 further comprises a temperature sensor 24, the temperature sensor 24 being adapted to detect the temperature of the first light receiver 23. The processor 4 may receive temperature data from the temperature sensor 24 and calculate the dark current I based on the dataDarkness。
Current IBright Light (LIGHT)The linear range may extend over four or more orders of magnitude, roughly proportional to the intensity of light (in lux) applied to the first light receiver 23, within the linear range. Table 1 below shows an example relationship between the intensity of light and the current through the light sensor.
TABLE 1
Light intensity IBright Light (LIGHT)According to the illumination
(lux) (microampere)
2 0.1
20 1
200 10
2000 100
In this embodiment, the measurement circuit in the luminaire assembly 2 may measure the current I through the light sensorPhotodiodeIn order to compensate for dark current IDarknessThe processor 4 calculates: i isBright Light (LIGHT)＝IPhotodiode-IDarkness. Based on current IBright Light (LIGHT)And the known relationship between the light intensities (table 1), the processor 4 may determine a value for the first light intensity.
As a preferred option, the processor 4 may be adapted to determine whether the intensity of light received by the first light receiver 23 is affected by the presence of further light on the optical window 21. It is assumed that in one detection, there is extra light, for example, a car light, a flashlight or other light that can illuminate the light receiver 23 and does not illuminate the second light receiver 3, and at this time, the first light intensity is inevitably increased, while such additional external light source does not illuminate for a long time and is turned off before the next or several detections, so that the first light intensity is reduced, and therefore a false determination that there is an obstacle is obtained. Therefore, through logic setting, when the first light intensity is increased and the third light intensity is almost unchanged in two adjacent detections, it is determined that there is an additional external light source, and until the first light intensity is decreased for the first time, it is determined that the additional external light source is turned off, and when the first light intensity is decreased for the second time, it is determined that there is an obstacle.
A lighting obstacle detection method for a street lamp, comprising the steps of:
s200: collecting a first light intensity collected by the first light receiver 23 and collecting a third light intensity collected by the second light receiver 3;
s300: judging whether a barrier exists on the optical window 21 by judging the light intensity change values of the first light intensity and the second light intensity, and if the third light intensity is greater than the first light intensity and the first light intensities of two adjacent times are obviously reduced (namely the first light intensity change value is greater than a threshold value), indicating that the barrier exists; otherwise, the obstacle does not exist;
in order to improve the detection accuracy, under the above conditions, it is necessary that the third light intensity variation value acquired by the second light receiver 3 is smaller than the threshold, which indicates that there is a blocking object, because in daytime, there is a case where light is blocked by clouds, at this time, the first light intensity is significantly reduced, but it cannot indicate that there is an obstacle, so that the detection accuracy is improved by adding conditions;
s600: if the obstacle exists, the obstacle cleaning system is started to remove the obstruction on the optical window 21;
s700: and repeating the steps after a certain time interval or continuously repeating the steps.
An obstacle cleaning system comprises a lighting obstacle detection system for street lamps, and further comprises a plurality of nozzles and pumps electrically connected with a processor 4, wherein the nozzles face an optical window 21, and once obstacles are detected, the nozzles remove the obstacles by means of air injection or water injection.
Example 2
An illuminated obstacle detection system for a street light, comprising:
luminaire assembly 2, comprising:
an optical window 21, which is a light-transmitting structure and has a first side and a second side;
an illuminator 22 disposed on a first side of the optical window 21 for emitting a second outgoing light 221;
a first light receiver 23 disposed on a first side of the optical window 21 for receiving the second outgoing light 221 and outputting a second light intensity of the received second outgoing light 221;
the second light receiver 3 is disposed on the second side of the optical window 21, and configured to receive the second outgoing light 221 passing through the optical window 21 and output a fourth light intensity of the received second outgoing light 221;
the processor 4 is electrically connected to the second light receiver 3 and the illuminator component 2, and receives the second light intensity and the fourth light intensity.
When there is no shelter outside the optical window 21, the second outgoing light 221 emitted by the illuminator 22 is irradiated on the optical window 21 and reflected and refracted, wherein the reflected light is emitted to the first light receiver 23, and the first light receiver 23 receives the second outgoing light 221 and outputs a second light intensity; meanwhile, the refracted light of the second outgoing light 221 is irradiated on an external object, and reaches the second light receiver 3 through reflection by the external object, and the second light receiver 3 receives the light and outputs fourth light intensity.
When there is a shielding object outside the optical window 21, the second light intensity of the second outgoing light 221 received by the first light receiver 23 is enhanced due to the shielding object (due to the presence of the shielding object, the refracted light is weakened); and the refracted light portion of the second outgoing light 221 emitted by the illuminator 22 is weakened due to the existence of the obstacle, resulting in weakening the fourth light intensity received by the second light receiver 3.
The detection process may be set to be continuous or repeated after a number of time intervals.
In summary, therefore, it is only necessary to judge: in the two consecutive detection results, the fourth light intensity of the detection result of the next time is decreased by a larger amount, and the second light intensity is increased, which indicates that an obstacle exists on the optical window 21 and the obstacle needs to be cleared.
In the present embodiment, the case of nighttime is mainly considered, and in the present embodiment, only the light of the illuminator 22 is considered.
The processor 4 may also be used, among other things, to detect whether an external light source is currently present, since external light sources (e.g. car lights, building lights) may affect the result. When there is no obstruction outside the optical window 21, the second light intensity and the fourth light intensity are enhanced by the external light source; when there is a shielding object outside the optical window 21, the second outgoing light 221 received by the first light receiver 23 is enhanced, but the received light from the external light source is weakened, so that the final result cannot be determined, while the second outgoing light 221 received by the second light receiver 3 is weakened and the received light from the external light source is enhanced, but the second outgoing light 221 received by the second light receiver 3 is the reflected light of the object, and is itself weaker, while the light from the external light source is the direct light, and the intensity of the direct light is greater than the reflected light of the object, so that the intensity of the fourth light received by the second light receiver 3 is generally enhanced. Therefore, as long as the fourth light intensity received by the second light receiver 3 is increased, it indicates that there is an influence of the external light source on the detection result. Therefore, through logic setting in this embodiment, in two adjacent detections, the second light intensity and the fourth light intensity are both increased, and it is determined that there is an additional external light source, until the fourth light intensity is decreased for the first time, it is determined that the additional external light source is turned off, and when the fourth light intensity is decreased for the second time, it is determined that there is an obstacle.
The rest of the description is given above and will not be repeated.
A lighting obstacle detection method for a street lamp, comprising the steps of:
s200: collecting the second light intensity collected by the first light receiver 23, and collecting the fourth light intensity collected by the second light receiver 3;
s300: judging whether a shelter exists on the optical window 21 by judging the light intensity change values of the first light intensity and the second light intensity, and if the second light intensity is greater than the fourth light intensity and the second light intensity detected twice is enhanced and the fourth light intensity is reduced, indicating that an obstacle exists; otherwise, the obstacle does not exist;
s600: if the obstacle exists, the obstacle cleaning system is started to remove the obstruction on the optical window 21;
s700: and repeating the steps after a certain time interval or continuously repeating the steps.
If the second light intensity variation value collected by the first light receiver 23 is greater than the threshold value and the fourth light intensity variation value collected by the second light receiver 3 is greater than the threshold value, it indicates that a blocking object exists.
Example 3
An illuminated obstacle detection system for a street light, comprising:
an external light source 1 for emitting first outgoing light 11;
luminaire assembly 2, comprising:
an optical window 21, which is a light-transmitting structure and has a first side and a second side;
an illuminator 22 disposed on a first side of the optical window 21 for emitting a second outgoing light 221;
a first light receiver 23 disposed on a first side of the optical window 21 for receiving the first outgoing light 11 passing through the optical window 21 and receiving the second outgoing light 221 and outputting a fifth light intensity of the received light;
the second light receiver 3 is arranged at the second side of the optical window 21 and used for receiving the first emergent light 11 and the second emergent light 221 passing through the optical window 21 and outputting sixth light intensity of the received light;
and the processor 4 is electrically connected with the second light receiver 3 and the illuminator assembly 2 and is used for receiving the fifth light intensity and the sixth light intensity.
In the present embodiment, the case of strong sunlight in the daytime is mainly considered, wherein the external light source 1 is sunlight.
When no shielding object exists outside the optical window 21, the first outgoing light 11 emitted by the external light source 1 passes through the optical window 21 to reach the first light receiver 23, and the first light receiver 23 receives the first outgoing light 11 and outputs fifth light intensity; meanwhile, the first outgoing light 11 emitted by the external light source 1 reaches the second light receiver 3, the second light receiver 3 receives the first outgoing light 11 and outputs sixth light intensity, at this time, because the first outgoing light 11 received by the second light receiver 3 is direct light, the first outgoing light 11 received by the first light receiver 23 is light passing through the optical window 21, and there is a part of light reflected on the surface of the optical window 21, the sixth light intensity is greater than the fifth light intensity.
When there is a shielding object outside the optical window 21, the fifth light intensity of the first outgoing light 11 received by the first light receiver 23 is reduced or even eliminated due to the existence of the shielding object; the second light receiver 3 is disposed on the second side (i.e. the outer side) of the optical window 21, and is not affected by the presence of the shielding object, so that the sixth light intensity of the first outgoing light 11 received by the second light receiver 3 is not changed.
Therefore, only need to judge: in the two consecutive detection results, the fifth light intensity of the detection result at the next time is reduced by a larger amplitude and even becomes zero, and the sixth light intensity hardly changes, which indicates that an obstacle exists on the optical window 21 and the obstacle removal is required.
In practice, the optical window 21 may be a transparent cover of a street lamp, but because the size of the transparent cover is larger and the size of the first light receiver 23 is smaller, once the size of the obstacle is smaller and the obstacle does not directly cover the light path of the first light receiver 23 receiving the sunlight, the fifth light intensity will not be changed due to the existence of the obstacle. In this case, therefore, the aforementioned solution cannot detect a small obstacle.
In this embodiment, the lighting device 22 is further included, and is disposed on the first side of the optical window 21, and is configured to emit the second outgoing light 221. The first light receiver 23 is used for receiving the first outgoing light 11 passing through the optical window 21 and receiving the second outgoing light 221 and outputting fifth light intensity of the received light; the second light receiver 3 is configured to receive the first outgoing light 11 and receive the second outgoing light 221 passing through the optical window 21 and output a sixth light intensity of the received light.
After the detection of the above scheme is completed, if no obstacle is detected, the illuminator 22 is turned on, and at this time, when no obstacle exists outside the optical window 21, both the fifth light intensity and the sixth light intensity are enhanced (where the enhancement range of the sixth light intensity is not obvious, but does not affect the implementation of the scheme); when there is a shielding object outside the optical window 21, the fifth light intensity is enhanced due to the presence of the shielding object (due to the presence of the shielding object, the refracted light of the second outgoing light 221 is weakened); the sixth light intensity is not significantly enhanced, so the reduction is not significant. Therefore, the present embodiment can also realize the detection of small-sized obstacles on the basis of embodiment 1.
The rest of the description is given above and will not be repeated.
A lighting obstacle detection method for a street lamp, comprising the steps of:
s200: the illuminator 22 is in the off state, and the fifth light intensity collected by the first light receiver 23 and the sixth light intensity collected by the second light receiver 3 are collected;
s300: judging whether a barrier exists on the optical window 21 by judging the light intensity change values of the first light intensity and the second light intensity, and if the sixth light intensity is greater than the fifth light intensity and the fifth light intensity of two adjacent times is obviously reduced (namely the fifth light intensity change value is greater than a threshold), indicating that an obstacle exists; the adjacent two times refer to the fifth light intensity when the illuminator 22 was not turned on last time and the fifth light intensity when the illuminator 22 was not turned on this time;
in order to improve the detection accuracy, under the above conditions, if the sixth light intensity variation value acquired by the second light receiver 3 is smaller than the threshold, it indicates that a blocking object exists, because in daytime, the light is blocked by the cloud, at this time, the fifth light intensity is significantly reduced, but it cannot indicate that an obstacle exists, so the detection accuracy is improved by adding conditions; if the shielding object exists, the step S600 is carried out; if no shielding object exists, the step S400 is executed;
s400: the illuminator 22 is turned on, and fifth light intensity collected by the first light receiver 23 and sixth light intensity collected by the second light receiver 3 are collected;
s500: judging whether a blocking object exists on the optical window 21 by judging the light intensity change values of the first light intensity and the second light intensity, and if the fifth light intensity of two adjacent times is enhanced (namely the fifth light intensity change value is greater than a threshold value), indicating that an obstacle exists, wherein the two adjacent times refer to the fifth light intensity when the illuminator 22 is turned on last time and the fifth light intensity when the illuminator 22 is turned on this time; if the shielding object exists, the step S600 is carried out;
s600: if the obstacle exists, the obstacle cleaning system is started to remove the obstruction on the optical window 21;
s700: and repeating the steps after a certain time interval or continuously repeating the steps.
Example 4
An illuminated obstacle detection system for a street light, comprising:
an external light source 1 for emitting first outgoing light 11;
luminaire assembly 2, comprising:
an optical window 21, which is a light-transmitting structure and has a first side and a second side;
an illuminator 22 disposed on a first side of the optical window 21 for emitting a second outgoing light 221;
a first light receiver 23 disposed on a first side of the optical window 21 for receiving the first outgoing light 11 passing through the optical window 21 and receiving the second outgoing light 221 and outputting a fifth light intensity of the received light;
the second light receiver 3 is arranged at the second side of the optical window 21 and used for receiving the first emergent light 11 and the second emergent light 221 passing through the optical window 21 and outputting sixth light intensity of the received light;
and the processor 4 is electrically connected with the second light receiver 3 and the illuminator assembly 2 and is used for receiving the fifth light intensity and the sixth light intensity.
Embodiment 4 differs from embodiment 3 in that in this embodiment, mainly the case of cloudy days is considered, wherein the external light source 1 is a building lamp or a car lamp or the like.
Since in practice the building lights or vehicle lights are an unstable factor, there is no way to exist for a long time, but as long as the total light intensity received by the light sensor is greater than the threshold value (20 lux in this embodiment), it can be used to detect an obstacle. Table 1 shows the intensities of different types of external light sources.
TABLE 1
Figure BDA0003470503440000161
Figure BDA0003470503440000171
For example, the threshold light intensity for detecting obstacles may be 20lux (lumen per square meter), possibly 72,000lumens of low-pressure sodium building light. The light intensity at the position of the obstacle detecting system can be calculated according to the following equation 1:
Figure BDA0003470503440000172
where I is the light intensity in lux at the location of the obstacle detection system, S is the intensity of the building light in lumen, and r is the distance from the building light to the obstacle detection system. Based on equation 1, in the case where the obstacle detection system is located 20 meters away from the building lamp, the light intensity I of the location of the obstacle detection system may be calculated as 14.3 lux. In the case where the predetermined threshold for detecting an obstacle is 20lux, the light from the building lamp is not greater than the predetermined threshold, and thus is insufficient to detect an obstacle. In the case where a plurality of building lamps are close to an obstacle, the light intensity of each building lamp at the position of the obstacle detection system may be calculated as described above; the light intensity of each building light at the location of the obstacle detection system may be added together to determine whether the total light intensity I at the location of the obstacle detection system is sufficient to detect an obstacle. However, since the total light intensity I is a floating value (which may be changed by turning on or off the building lamp), in this embodiment, the sixth light intensity received by the second light receiver 3 is used as a reference, and if the total light intensity I is greater than 20lux, the total light intensity I is reduced to 20lux in an equal proportion, and the fifth light intensity received by the first light receiver 23 is reduced in a corresponding proportion, so as to detect the obstacle.
Alternatively, in some cases, the Quantum Efficiency (QE) of the second light receiver 3 and/or the first light receiver 23 is taken into account in determining whether the light intensity available at the location of the obstacle detection system is greater than a predetermined light intensity threshold. For example, the quantum efficiency of the first light receiver 23 is a measure of the sensitivity of the light sensor to light of different wavelengths. Due to the reduced conversion efficiency of the light sensor at certain wavelengths, a lamp with an intensity of x lumen at the light source may be perceived by the light sensor as having an intensity a x (x), where a is the efficiency factor due to the quantum efficiency on the spectrum of the illumination light from the light source.
Referring to some common light source types and corresponding light source intensities in table 1, it is possible to specify what type of light source is received by means of these correspondences. Based on the measurements, the efficiency factor of the first light receiver 23 and the efficiency factor of the second light receiver 3 can be determined according to the following equation 2.
Figure BDA0003470503440000181
Wherein a isOptical sensorIs the efficiency factor of the light sensor, ILight sourceIs the light intensity of the light source, and IReceivingIs the intensity of light sensed by the light sensor.
When calculating the total light intensity I, the efficiency factor of the first light receiver 23 and the efficiency factor of the second light receiver 3 are calculated first, so that the accurate total light intensity I can be calculated.
The second light receiver 3 may be a digital camera, each pixel of the captured image having a value representing the light intensity at that point. The amount of exposure (brightness of the image) is proportional to the number of electrons released by photons striking the photosensor in the digital camera. Therefore, the brightness is proportional to the illumination intensity (in lux) multiplied by the exposure time.
Therein, the scene brightness from the external light source 1 can be calculated from equation 3 as follows:
Figure BDA0003470503440000182
wherein N isdIs the value of a pixel in the image, KcIs the calibration constant of the digital camera, t is the exposure time in seconds, fsIs the f-stop, S is the ISO sensitivity of the document, LsIs the brightness of the scene in candela/square meter (m)2)。
Example 5
Embodiment 5 differs from embodiment 2 in that, as shown in fig. 9, the illuminator module 2 includes an optical window 21, an illuminator 22, and a measuring circuit electrically connected to the illuminator 22. The present embodiment determines the intensity of the reflected light from the optical window 21 by a shift based on the IV curve of the illuminator 22. The illuminator 22 may be an LED. The measurement circuit is configured to measure the current and voltage of the illuminator 22.
As shown in fig. 10, a first IV curve 5 and a second IV curve 6. The first IV curve is an example IV curve when there are no obstructions on the optical window. In the presence of an obstruction on the optical window, the IV may be moved to the second IV curve. The current through the illuminator can be reduced for the same applied voltage.
The processor 4 is arranged to determine the offset between the first IV curve without the obstruction and the second IV curve with the obstruction and to determine whether the obstruction is present on the optical window by comparing the actual curve with the two.
In this embodiment, the illuminator may be used for both emitting light and detecting received light, and thus may be understood to be used as both an illumination element and a light sensor.
The above is only a preferred embodiment of the present invention, and the scope of the present invention is defined by the appended claims, and several modifications and amendments made by those skilled in the art without departing from the spirit and scope of the present invention should be construed as the scope of the present invention.

Claims (10)

1. An illuminated obstacle detection system for a street light, comprising:
an external light source (1) for emitting first outgoing light (11);
luminaire assembly (2) comprising:
an optical window (21) being a light transmissive structure having a first side and a second side;
the first light receiver (23) is arranged on the first side of the optical window (21) and used for receiving the first emergent light (11) passing through the optical window (21) and outputting the first light intensity of the received first emergent light (11);
the second light receiver (3) is arranged on the second side of the optical window (21) and used for receiving the first emergent light (11) and outputting third light intensity of the received first emergent light (11);
and the processor (4) is electrically connected with the second light receiver (3) and the illuminator component (2) and is used for receiving the first light intensity and the third light intensity.
2. An illuminated obstacle detection system for a street light, comprising:
luminaire assembly (2) comprising:
an optical window (21) being a light transmissive structure having a first side and a second side;
an illuminator (22) disposed on a first side of the optical window (21) for emitting a second outgoing light (221);
the first light receiver (23) is arranged on the first side of the optical window (21) and used for receiving the second emergent light (221) and outputting the second light intensity of the received second emergent light (221);
the second light receiver (3) is arranged on the second side of the optical window (21) and used for receiving the second emergent light (221) passing through the optical window (21) and outputting the fourth light intensity of the received second emergent light (221);
and the processor (4) is electrically connected with the second light receiver (3) and the illuminator component (2) and is used for receiving the second light intensity and the fourth light intensity.
3. An illuminated obstacle detection system for a street light, comprising:
an external light source (1) for emitting first outgoing light (11);
luminaire assembly (2) comprising:
an optical window (21) being a light transmissive structure having a first side and a second side;
an illuminator (22) disposed on a first side of the optical window (21) for emitting a second outgoing light (221);
the first light receiver (23) is arranged on the first side of the optical window (21) and used for receiving the first emergent light (11) passing through the optical window (21) and the second emergent light (221) and outputting fifth light intensity of the received light;
the second light receiver (3) is arranged on the second side of the optical window (21) and used for receiving the first emergent light (11), receiving the second emergent light (221) passing through the optical window (21) and outputting sixth light intensity of the received light;
and the processor (4) is electrically connected with the second light receiver (3) and the illuminator component (2) and is used for receiving the fifth light intensity and the sixth light intensity.
4. The illuminated obstacle detecting system for street lamps according to claim 3, wherein the luminaire assembly (2) is arranged on the same side of the external light source (1) as the second light receiver (3), and the second outgoing light (221) emitted by the luminaire (22) is received by the second light receiver (3) after passing through the optical window (21) and being reflected by an object.
5. The illuminated obstacle detecting system for a street light according to claim 3, wherein the illuminator (22) is disposed on the same side of the optical window (21) as the first light receiver (23), the first light receiver (23) being configured to receive the second outgoing light (221) reflected via the optical window (21) and output a second light intensity of the received second outgoing light (221).
6. A lighting obstacle detection system for street lamps according to claim 3, characterized in that the luminaire assembly (2) further comprises a temperature sensor (24), the temperature sensor (24) being adapted to detect the temperature of the first light receiver (23).
7. An obstacle cleaning system, comprising a lighting obstacle detection system for street lamps as claimed in any one of claims 1 to 6, further comprising a plurality of nozzles directed towards the optical window (21), which upon detection of an obstacle, remove the obstacle by means of air or water jets.
8. A lighting obstacle detection method for a street lamp, characterized by comprising the steps of:
s100: judging whether an external light source is available, and if so, entering S200; if not, entering S400;
s200: the illuminator (22) is in a closed state, and collected light intensity of the first light receiver (23) and the second light receiver (3) is collected;
s300: judging whether a shelter exists on the optical window (21) by judging the light intensity change values of the two, and entering S400 if no shelter exists;
s400: turning on the illuminator (22) and collecting the collected light intensities of the first light receiver (23) and the second light receiver (3);
s500: judging whether a shelter exists on the optical window (21) or not by judging the light intensity change values of the two;
s700: and repeating the steps after a certain time interval or continuously repeating the steps.
9. The method of detecting an illuminated obstacle for a street light as recited in claim 8, further comprising S600: opening the barrier cleaning system to remove the obstruction on the optical window (21); the S300 further includes: if the shielding object exists, the step S600 is carried out; the S500 further includes: if the obstruction exists, the process proceeds to S600.
10. The illuminated obstacle detecting method for a street lamp according to claim 8,
the specific judgment method for the existence of the shielding object is as follows, and in the two adjacent detections:
if the first light intensity change value collected by the first light receiver (23) is greater than the threshold value and the third light intensity change value collected by the second light receiver (3) is less than the threshold value, indicating that a shelter exists;
if the second light intensity change value collected by the first light receiver (23) is greater than the threshold value and the fourth light intensity change value collected by the second light receiver (3) is greater than the threshold value, the existence of the obstruction is indicated.
CN202210041681.0A 2021-12-17 2022-01-14 Lighting barrier detection system and method for street lamp and cleaning system Pending CN114550080A (en)

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CN202111549054 2021-12-17

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