CN220271583U - Integrated optical path of light rainfall sensor, light rainfall detection system and application system - Google Patents
Integrated optical path of light rainfall sensor, light rainfall detection system and application system Download PDFInfo
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Abstract
The utility model provides an integrated optical path of a light rainfall sensor, a light rainfall detection system and an application system, wherein the integrated optical path comprises a special prism and a right-angle prism; the emergent face of the special-shaped prism is a plane, and an included angle between emergent rays of the special-shaped prism and the emergent face of the special-shaped prism is 45 degrees; the inclined plane of the right-angle prism is an incident plane, the incident plane of the right-angle prism and the emergent plane of the special-shaped prism are positioned on the same horizontal plane, the included angle between the incident light of the right-angle prism and the incident plane of the right-angle prism is 45 degrees, and the emergent plane of the right-angle prism is a right-angle plane matched with the direction of the light path. The integrated optical path of the light and rain sensor has the advantages of folding optical path, reducing volume and ensuring performance.
Description
Technical Field
The utility model relates to the technical field of sensors, in particular to an integrated optical path of a light rainfall sensor, a light rainfall detection system and an application system.
Background
The current mainstream light rainfall sensor is a compound sensor for detecting the light intensity and rainfall of the environment in a non-contact mode. The light rainfall sensor is arranged on the vehicle-mounted glass and used for detecting light intensity signals and rainfall, and light intensity weak control of an in-vehicle lamp and swinging frequency of the windshield wiper are realized through internal regulation and control of a vehicle system, so that a driver is helped to drive more safely and comfortably.
The structure of the current light and rain sensor at least needs to detect light and rain respectively through two photoelectric detectors, and the structure for detecting the rain mainly comprises a light emitting diode, a collimating lens, a converging lens and a photodiode. The light emitting diode is used as a light source, the point light source is changed into parallel light through the collimating lens, under the condition that the surface of the vehicle-mounted windshield is free from rain, the light meets the total reflection condition, is reflected to the converging lens by the windshield, and the photodiode is placed on the focal plane and is used for receiving the converging light. Under the condition that the surface of the vehicle-mounted windshield is rainy, the total reflection condition is destroyed, the light cannot be totally reflected, partial reflection occurs according to the area of water drops, only partial signals are received by the receiving tube, and the rainfall can be calculated according to the percentage ratio. In addition, the detection structure for the ambient light intensity mainly comprises a converging lens and a photodiode, wherein the converging lens collects the ambient light and converges the ambient light on a photoelectric detector, and the photoelectric detector converts a light intensity signal into a current signal.
The structure for realizing the rain detection by utilizing the total reflection principle has the characteristic of simple structure, but a plurality of pairs of light paths are needed to be added for realizing the rain detection at a plurality of positions, so that the problems of volume increase, complex structure and cost increase are caused.
The applicant's prior patent application "method and apparatus for detecting solid or liquid attachment on the surface of transparent plate" (application No. 202211207134.1) describes a system for light and rain composite detection by using a single-pixel imaging system, which has better effect and better efficiency than the conventional rain sensor, but the solution described in the patent application needs to overcome further problems, specifically, the light path needs to be ensured to be short enough in the process from the transmitting end to the receiving end so as to be installed in a specific application scene, such as a windshield of an automobile, so that the requirement is put on the design of the light path.
In order to solve the above problems, an ideal technical solution is always sought.
Disclosure of Invention
The utility model aims at overcoming the defects of the prior art, and provides a light rainfall sensor integrated optical path, a light rainfall detection system and an application system, wherein the folded optical path is smaller in overall size, and optical path parameters and performances are guaranteed.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: an integrated optical path of a light and rain sensor comprises a special prism and a right angle prism;
the emergent face of the special-shaped prism is a plane, and an included angle between emergent rays of the special-shaped prism and the emergent face of the special-shaped prism is 45 degrees;
the inclined plane of the right-angle prism is an incident plane, the incident plane of the right-angle prism and the emergent plane of the special-shaped prism are positioned on the same horizontal plane, the included angle between the incident light of the right-angle prism and the incident plane of the right-angle prism is 45 degrees, and the emergent plane of the right-angle prism is a right-angle plane matched with the direction of the light path.
The cross section of the right-angle prism is isosceles right triangle.
Basically, along the direction of the light path, the front side of the special-shaped prism is provided with a first reflecting mirror, and light rays are reflected by the first reflecting mirror and enter the incident surface of the special-shaped prism.
The second reflecting mirror is arranged at the rear side of the right-angle prism along the light path direction, and the emergent light of the right-angle prism is reflected by the second reflecting mirror and then led out.
A light rainfall detection system comprises a planar array light source, a first imaging system, a second imaging system, a barrel-shaped detector and a light rainfall sensor integrated optical path;
the surface array light source is used for generating a programmable surface array light source with a specific shape;
the first imaging system is used for imaging the surface array light source and outputting the formed image along the integrated optical path of the light rainfall sensor;
the special-shaped prism of the integrated optical path of the light and rain sensor is used for transmitting received light to the transparent glass, and the incident surface of the right-angle prism is used for receiving the light reflected by the transparent glass and outputting the light to the second imaging system;
the second imaging system is used for re-imaging and guiding the received light rays to the barrel-shaped detector.
A light and rain sensing detection application system comprises a surface array light source, a first imaging system, a second imaging system, a barrel-shaped detector, transparent glass and a light and rain sensor integrated optical path;
the surface array light source is used for generating a programmable surface array light source with a specific shape;
the first imaging system is used for imaging the surface array light source and outputting the formed image along the integrated optical path of the light rainfall sensor;
the emergent surface of the special-shaped prism and the incident surface of the right-angle prism are tightly attached to the inner side surface of the transparent glass, and the outer side surface of the transparent glass is a rainfall detection surface;
the special-shaped prism of the integrated optical path of the light and rain sensor is used for transmitting received light to the transparent glass, and the incident surface of the right-angle prism is used for receiving the light reflected by the transparent glass and outputting the light to the second imaging system;
the second imaging system is used for re-imaging and guiding the received light rays to the barrel-shaped detector.
Compared with the prior art, the utility model has substantial characteristics and progress, and in particular has the following advantages:
1. in order to reduce the volume of the whole optical structure and ensure that the optical path passes through the necessary length, the optical path core taking the special-shaped prism and the right-angle prism as relay optical paths is designed, wherein the structural form of the special-shaped prism is not limited to common shapes, but the special-shaped prism is designed according to the installation requirements of practical application scenes and the optical paths, the core characteristics of the special-shaped prism are that the angle of emergent light is controllable, the incident light is determined according to the structural characteristics, and the structural characteristics are determined according to the environmental characteristics, so that the structure of the special-shaped prism is usually special-shaped, the right-angle prism has the function of guiding the emergent light according to the better optical path direction, the requirements of a receiving end are met, the special-shaped prism and the right-angle prism are combined, the miniaturization of the optical path structure can be ensured, and the folding of the optical path is realized.
2. To simplify the design of the optical path, two reflectors are added, so that the arrangement direction of the optical path in a specific application environment is more graceful.
3. The utility model provides a light rainfall sensing detecting system and light rainfall sensing detecting application system, based on the face array light source, the light of projecting face array when transparent glass outside rainwater exists, and the total reflection condition is destroyed, and the light is transmitted, and after the image is restored, can cause the image to correspond the position and be black, can judge that there is the rainwater in corresponding position. On the contrary, the light rays realize total reflection on the transparent glass, after the image is restored, the corresponding position of the image is white, and the condition that no rainwater exists at the corresponding position can be judged; and in the flash-extinguishing gap of the area array light source, the light intensity of the environment is directly detected by utilizing the second half of the light path, so that the composite detection of rainfall and the environment light is realized.
Drawings
Fig. 1 is a schematic structural diagram of one application form of the integrated optical circuit of the light and rain sensor in embodiment 1 of the present utility model.
Fig. 2 is a schematic diagram of the structure of one application form of the light rainfall sensing detection system in embodiment 2 of the present utility model.
In the figure: 1. a special-shaped prism; 2. a right angle prism; 3. an exit surface of the special-shaped prism; 4. the emergent ray of the special-shaped prism; 5. an incident surface of the right angle prism; 6. incident light of the right angle prism; 7. a first mirror; 8. a second mirror; 11. a planar array light source; 12. a first imaging system; 13. a second imaging system; 14. a barrel detector; 15. the integrated optical path of the light rainfall sensor.
Detailed Description
The technical scheme of the utility model is further described in detail through the following specific embodiments.
Example 1
As shown in fig. 1, an integrated optical path of a light and rain sensor includes a profiled prism 1 and a right angle prism 2.
The emergent face 3 of the special-shaped prism is a plane, and an included angle between the emergent light 4 of the special-shaped prism and the emergent face 3 of the special-shaped prism is 45 degrees.
Specifically, the special-shaped prism 1 has the main functions of receiving incident light and transmitting the incident light out of the exit surface, and the transmission angle is 45 °, so that the special-shaped element of the special-shaped prism 1 is used for determining the incident direction and the exit direction, the determination of the incident direction is determined by the installation environment, for example, at the windshield of a vehicle, the special-shaped prisms with different shapes are required to meet the requirement of space installation due to different structures of different vehicles and different positions capable of bearing light sources, and therefore, the special-shaped prisms can be prism structures with different multi-surface widths, such as triangular prisms, quadrangular prisms, hexagonal prisms and the like.
The inclined plane of the right-angle prism 2 is an incident plane, and the incident plane 5 of the right-angle prism and the emergent plane 3 of the special-shaped prism are positioned on the same horizontal plane and are parallel to the detected transparent glass.
The included angle between the incident light 6 of the right-angle prism and the incident surface 5 of the right-angle prism is 45 degrees, and the emergent surface of the right-angle prism is a right-angle surface which is matched with the direction of the light path.
In order to reduce the arrangement difficulty, a first reflector 7 is arranged on the front side of the special-shaped prism along the light path direction, light rays enter the incidence surface of the special-shaped prism through reflection of the first reflector, a second reflector 8 is arranged on the rear side of the right-angle prism along the light path direction, and emergent light of the right-angle prism is guided out after reflection of the second reflector.
Example 2
As shown in fig. 2, a light rainfall detection system comprises a surface array light source 11, a first imaging system 12, a second imaging system 13, a barrel-shaped detector 14 and a light rainfall sensor integrated optical path 15.
The area array light source 11 is used to generate a programmable area array light source with a specific shape, and is designed based on a single-pixel imaging principle, and can encode patterns with different shapes of strokes, such as digital patterns, and the main purpose is to distribute the area array of the stroke light.
The first imaging system is used for imaging the surface array light source, outputting the formed image along the integrated optical path of the light rainfall sensor, and the first imaging system is a lens and is used for projecting the formed image plane out and finally projecting the formed image plane onto the surface of the detected transparent glass.
The special prism of the integrated optical path 15 of the light and rain sensor is used for transmitting the received light to the transparent glass, and the incident surface of the right-angle prism is used for receiving the light reflected by the transparent glass and outputting the light to the second imaging system.
The second imaging system is used for re-imaging the received light, so that the object points distributed on the transparent glass can be projected into the barrel-shaped detector, and the barrel-shaped detector is a detector with single pixels and is used for collecting the light energy converged by the second imaging system and converting the light energy into electric signals to be output so as to make judgment.
Example 3
The present embodiment is one of application forms of embodiment 2, and is a light rainfall sensing detection application system, which includes a planar array light source 11, a first imaging system 12, a second imaging system 13, a barrel-shaped detector 14, a transparent glass 16, and a light rainfall sensor integrated optical path 15.
The surface array light source is used for generating a programmable surface array light source with a specific shape;
the first imaging system is used for imaging the surface array light source and outputting the formed image along the integrated optical path of the light rainfall sensor;
the emergent surface of the special-shaped prism and the incident surface of the right-angle prism are tightly attached to the inner side surface of the transparent glass, and the outer side surface of the transparent glass is a rainfall detection surface;
the special-shaped prism of the integrated optical path of the light and rain sensor is used for transmitting received light to the transparent glass, and the incident surface of the right-angle prism is used for receiving the light reflected by the transparent glass and outputting the light to the second imaging system;
the second imaging system is used for re-imaging and guiding the received light rays to the barrel-shaped detector.
Working principle:
taking an automobile windshield as an example, an LED array light source can be adopted as a surface array light source, a programmable control program is added, different patterns are output, the output patterns are converted by a first reflecting mirror and a special-shaped prism by a first imaging system, then enter the windshield at an incidence angle of 45 degrees, under the condition of no rain, the total reflection characteristic of light is met, the light is reflected into a second imaging system by a right-angle prism and a second reflecting mirror and finally received by a barrel-shaped detector, and the barrel-shaped detector restores the image point position distribution of the LED array light source to obtain a full-bright pattern to acquire no rain.
Under the rainy condition, after the light enters the windshield, the position of the raindrop can destroy the total reflection condition, the light is transmitted out, dark spots can appear at the corresponding positions in the pattern restored by the barrel-shaped detector, and whether the raindrop exists at the corresponding positions can be judged through the parameter analysis of the light path.
When the LED array light source is turned off, the cylindrical detector receives only light from the environment, so that the light intensity of the environment light can be perceived, the environment light detection is realized, and the process can be performed in a flash-out gap of the LED array light source.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present utility model and are not limiting; while the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present utility model or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the utility model, it is intended to cover the scope of the utility model as claimed.
Claims (10)
1. An integrated optical path of a light rainfall sensor, which is characterized in that: comprises a special-shaped prism and a right-angle prism;
the emergent face of the special-shaped prism is a plane, and an included angle between emergent rays of the special-shaped prism and the emergent face of the special-shaped prism is 45 degrees;
the inclined plane of the right-angle prism is an incident plane, the incident plane of the right-angle prism and the emergent plane of the special-shaped prism are positioned on the same horizontal plane, the included angle between the incident light of the right-angle prism and the incident plane of the right-angle prism is 45 degrees, and the emergent plane of the right-angle prism is a right-angle plane matched with the direction of the light path.
2. The optical rain sensor integrated circuit of claim 1, wherein: the section of the right-angle prism is an isosceles right triangle.
3. The light and rain sensor integrated optical circuit of claim 1 or 2, wherein: along the light path direction, a first reflecting mirror is arranged at the front side of the special-shaped prism, and light rays are reflected by the first reflecting mirror and enter the incident surface of the special-shaped prism.
4. A light and rain sensor integrated optical circuit according to claim 3, wherein: along the light path direction, a second reflecting mirror is arranged at the rear side of the right-angle prism, and emergent light of the right-angle prism is reflected by the second reflecting mirror and then led out.
5. A light rainfall detection system is characterized in that: a light rain sensor integrated optical circuit comprising a planar array light source, a first imaging system, a second imaging system, a barrel detector, and the light rain sensor integrated optical circuit of claim 1 or 2;
the surface array light source is used for generating a programmable surface array light source with a specific shape;
the first imaging system is used for imaging the surface array light source and outputting the formed image along the integrated optical path of the light rainfall sensor;
the special-shaped prism of the integrated optical path of the light and rain sensor is used for transmitting received light to the transparent glass, and the incident surface of the right-angle prism is used for receiving the light reflected by the transparent glass and outputting the light to the second imaging system;
the second imaging system is used for re-imaging and guiding the received light rays to the barrel-shaped detector.
6. A light rainfall detection system according to claim 5 wherein: the first imaging system outputs the formed image along the integrated optical path of the light rainfall sensor through a first reflecting mirror.
7. A light rainfall detection system according to claim 6 wherein: the emergent light of the right-angle prism is output to a second imaging system through a second reflecting mirror.
8. An application system for sensing and detecting light rainfall is characterized in that: a light rain sensor integrated optical circuit comprising a planar array light source, a first imaging system, a second imaging system, a barrel detector, transparent glass, and the light rain sensor integrated optical circuit of claim 1 or 2;
the surface array light source is used for generating a programmable surface array light source with a specific shape;
the first imaging system is used for imaging the surface array light source and outputting the formed image along the integrated optical path of the light rainfall sensor;
the emergent surface of the special-shaped prism and the incident surface of the right-angle prism are tightly attached to the inner side surface of the transparent glass, and the outer side surface of the transparent glass is a rainfall detection surface;
the special-shaped prism of the integrated optical path of the light and rain sensor is used for transmitting received light to the transparent glass, and the incident surface of the right-angle prism is used for receiving the light reflected by the transparent glass and outputting the light to the second imaging system;
the second imaging system is used for re-imaging and guiding the received light rays to the barrel-shaped detector.
9. The light rainfall sensing detection application system of claim 8 wherein: the first imaging system outputs the formed image along the integrated optical path of the light rainfall sensor through a first reflecting mirror.
10. The light rainfall sensing detection application system of claim 9 wherein: the emergent light of the right-angle prism is output to a second imaging system through a second reflecting mirror.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320992873.XU CN220271583U (en) | 2023-04-27 | 2023-04-27 | Integrated optical path of light rainfall sensor, light rainfall detection system and application system |
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| CN202320992873.XU CN220271583U (en) | 2023-04-27 | 2023-04-27 | Integrated optical path of light rainfall sensor, light rainfall detection system and application system |
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