Self-cleaning and maintaining method and device for transmitting and receiving integrated optical sensing device

Abstract

The invention belongs to the technical field of optical window type element cleaning, and particularly relates to a self-cleaning and maintaining method and device for a receiving and transmitting integrated optical sensing device. Light information is sent to the optical window through the light receiving and transmitting module, the light information passes through the optical window to reach the spectrum reference plate to be reflected, and the light receiving and transmitting module receives the reflected light information and transmits the light information to the control and data processing module. The control and data processing module obtains information of attachments on the optical window according to the received optical information and classifies the attachments; when the attachments are of the first type, the control and data processing module cleans the attachments of the first type in a first processing mode; when the attachments are of the second type, the control and data processing module cleans the attachments of the second type in a second processing mode; and after the attachments are cleaned, the control and data processing module updates and stores the spectral data in the cleaning state. The problem of performance degradation existing in a super-hydrophobic surface cleaning scheme is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of cleaning optical window components, and in particular relates to a self-cleaning and maintaining method and device for a transceiver-integrated optical sensor component. Background Art

[0002] The cleaning of optical sensor windows is very complex and delicate, and has high requirements for cleanliness. Taking the application of LiDAR in automobiles as an example, the cleaning of such components cannot be completely carried out by the well-known mechanical window cleaning solution. Moreover, the cleanliness requirements of windows are much higher than those of car windows. For example, the current method based on multiple laser beam scanning means that a stain on the window will also cause a large deviation in the results.

[0003] The traditional solution basically only relies on physical cleaning brushes and liquid spray cleaning, but the cleaning effect is not ideal in actual use and is energy-intensive. Although the pure ultrasonic solution can remove some larger pollution particles, the cleaning effect on tiny particles is not outstanding enough.

[0004] Therefore, it is necessary to design a self-cleaning and maintaining method and device for a transceiver-integrated optical sensor device to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a self-cleaning and maintenance method and device for an integrated optical sensor device, combining ultrasound with a wettability solution to achieve performance improvement, and providing a cleanliness and wettability detection method and device in conjunction with the unique structure of an integrated optical sensor device, while selecting an aerogel solution that has little effect on the optical performance of the window to regularly maintain wettability. At the same time, the problem of performance attenuation in the artificially synthesized super-hydrophobic surface cleaning solution is solved, achieving the purpose of maintaining performance stability for a long time.

[0006] To achieve the above-mentioned purpose, the present invention provides the following scheme: a self-cleaning and maintenance method of a transceiver integrated optical sensor device, wherein light information is sent to an optical window through an optical transceiver module, the light information passes through the optical window to a spectrum reference plate and is reflected, the optical transceiver module receives the reflected light information and transmits the light information to a control and data processing module, and the control and data processing module obtains information about attachments on the optical window according to the received light information and classifies the attachments;

[0007] When the attachment is of the first type, the control and data processing module cleans the first type of attachment by a first processing method;

[0008] When the attachment is of the second type, the control and data processing module cleans the second type of attachment by a second processing method;

[0009] After the attachments are cleaned, the control and data processing module updates and stores the spectral data in the clean state.

[0010] According to the self-cleaning and maintaining method of a transceiver integrated optical sensor device of the present invention, the first type of attachment is an opaque pollutant, and the first treatment method includes ultrasonic treatment and spray treatment, and the opaque pollutants are removed by ultrasonic treatment and spray treatment.

[0011] Based on the self-cleaning and maintenance method of the transceiver-integrated optical sensor device of the present invention, the second type of attachment is a transparent liquid, and the second treatment method includes ultrasonic treatment and spray treatment. The transparent liquid is removed by ultrasonic treatment, and after the removal is completed, the optical window is hydrophobicized by spraying.

[0012] According to the self-cleaning and maintaining method of a transceiver integrated optical sensor device of the present invention, hydrophobic treatment is achieved by spraying aerogel on the optical window.

[0013] In the self-cleaning and maintaining method of a transceiver integrated optical sensor device according to the present invention, the aerogel is a mixture of silicon dioxide nanoparticles and low surface energy organic gas or a mixture of titanium dioxide nanoparticles and low surface energy organic gas.

[0014] According to the self-cleaning and maintaining method of the transceiver-integrated optical sensor device of the present invention, the diameters of the silicon dioxide nanoparticles and the titanium dioxide nanoparticles are less than 100 nm.

[0015] A self-cleaning device for an integrated optical sensor for transmitting and receiving, used to realize a self-cleaning and maintaining method for an integrated optical sensor for transmitting and receiving, comprising:

[0016] A spectral reference plate is arranged outside the optical window, and is used to reflect the light information transmitted by the optical transceiver module and passing through the optical window;

[0017] A control and data processing module is arranged inside the optical window, and is used to receive light information reflected by the spectrum reference plate, and obtain information of the attachment on the optical window according to the received light information;

[0018] An ultrasonic module is arranged on the inner side of the optical window, and is used to clean the attachments on the optical window;

[0019] A spray module is arranged on the inner side of the optical window, and a spray end of the spray module is arranged between the optical window and the spectral reference plate. The spray module is used to clean the attachments on the optical window and perform hydrophobic treatment on the cleaned optical window.

[0020] According to the self-cleaning device for an optical sensor device with an integrated transmitter and receiver of the present invention, a high-reflective coating is provided on a side of the spectral reference plate close to the optical window.

[0021] According to the self-cleaning device for an optical sensor device with an integrated transmitter and receiver of the present invention, a microstructure is arranged on a side of the optical window close to the spectral reference plate.

[0022] According to the self-cleaning device of a transceiver-integrated optical sensor device of the present invention, the size of the microstructure is smaller than the working wavelength of the optical sensor device.

[0023] Compared with the prior art, the present invention has the following advantages and technical effects:

[0024] The present invention combines ultrasound with a special wettability surface structure to achieve performance improvement, and cooperates with the unique structure of the optical sensor device that integrates transmission and reception to provide a method for detecting the surface cleanliness and wettability of the component. At the same time, the relevant equipment is matched to regularly modify the aerogel solution for the window to maintain wettability for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0026] Figure 1 is a flow chart of the method of the present invention;

[0027] Figure 2 It is a schematic diagram of the device of the present invention;

[0028] Figure 3 This is a schematic diagram of the spectrum reference plate of the present invention;

[0029] Figure 4 This is a droplet rolling test diagram after the hydrophobic treatment of the present invention;

[0030] Figure 5 is the optical transmission performance after the hydrophobic treatment of the present invention;

[0031] Figure 6 The figure is a comparison of the light field after the transmission of Gaussian beam according to the present invention. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figures 1 to 6 The present invention provides a self-cleaning and maintenance method for an integrated transceiver optical sensor device, wherein light information is sent to an optical window through an optical transceiver module, and the light information passes through the optical window to a spectrum reference plate and is reflected, and the optical transceiver module receives the reflected light information and transmits the light information to a control and data processing module, and the control and data processing module obtains information about attachments on the optical window according to the received light information and classifies the attachments;

[0035] When the attachment is of the first type, the control and data processing module cleans the first type of attachment by a first processing method;

[0036] When the attachment is of the second type, the control and data processing module cleans the second type of attachment by a second processing method;

[0037] After the attachments are cleaned, the control and data processing module updates and stores the spectral data in the clean state.

[0038] A large output light spot can be used in combination with a micro-area array with cross-high transmittance and total reflection; or the emission light spot can be shaped into a dense array covering the entire optical element and the full emission surface can be used as a spectral reference plate; both methods can detect contaminants in tiny areas on the window surface through multi-light point matching and comparison.

[0039] Furthermore, the first type of attachments are opaque pollutants, and the first treatment method includes ultrasonic treatment and spray treatment, and the opaque pollutants are removed by ultrasonic treatment and spray treatment.

[0040] Furthermore, the second type of attachment is a transparent liquid, and the second treatment method includes ultrasonic treatment and spray treatment. The transparent liquid is removed by ultrasonic treatment, and after the removal is completed, the optical window is subjected to hydrophobic treatment by spraying.

[0041] When the surface is an opaque pollutant, the corresponding received spectral energy area distribution is incomplete or the overall power is small; when the surface attachment is a transparent liquid, the spectrum peak drifts due to the difference in refractive index of the structural surface and the change in the electrical properties of the optical window.

[0042] According to the set attachment detection program, the optical transceiver module obtains specific information about the attachment by relying on the characteristics of the integrated photoelectric sensor. When the contaminant is opaque, ultrasonic treatment and spray treatment are required to remove the contaminant in a targeted manner. If the detected attachment is liquid, it means that the optical window no longer has super-hydrophobic properties, and the cleaned optical window needs to be dried and sprayed with low surface energy aerogel. After the entire cleaning and comparison process is completed, the spectral data in the clean state is updated and stored for use at the next startup.

[0043] Furthermore, hydrophobic treatment is achieved by spraying aerogel on the optical window.

[0044] Furthermore, the aerogel is a mixture of silicon dioxide nanoparticles and low surface energy organic gas or a mixture of titanium dioxide nanoparticles and low surface energy organic gas.

[0045] Furthermore, the diameters of the silicon dioxide nanoparticles and the titanium dioxide nanoparticles are less than 100 nm.

[0046] The super-hydrophobic property can effectively prevent the adsorption of liquid on the optical window and the impact on the sensing performance in humid and rainy and foggy weather. The ultrasonic module generates ultrasonic waves to cause the corresponding frequency vibration on the surface of the optical window, enhance the rolling efficiency of the liquid, and effectively remove the adsorption of pollutants on the surface of the optical window.

[0047] The cleaning performance can be improved by combining ultrasound with a special wettable surface structure. Combined with the unique structure of an optical sensor that integrates both transmitter and receiver, it can also provide both cleanliness and wettability detection methods.

[0048] In line with the actual application scenarios, relevant devices can be used to regularly maintain the wettability of the aerogel solution which has little effect on the optical properties of the optical window, thereby achieving long-term maintenance and monitoring of superhydrophobic properties.

[0049] A self-cleaning device for an integrated optical sensor for transmitting and receiving, used to realize a self-cleaning and maintaining method for an integrated optical sensor for transmitting and receiving, comprising:

[0050] A spectral reference plate is arranged outside the optical window, and is used to reflect the light information transmitted by the optical transceiver module and passing through the optical window;

[0051] A control and data processing module is arranged inside the optical window, and is used to receive light information reflected by the spectrum reference plate, and obtain information of the attachment on the optical window according to the received light information;

[0052] An ultrasonic module is arranged on the inner side of the optical window, and is used to clean the attachments on the optical window;

[0053] The spray module is arranged on the inner side of the optical window, and the spray end of the spray module is arranged between the optical window and the spectrum reference plate. The spray module is used to clean the attachments on the optical window and perform hydrophobic treatment on the cleaned optical window.

[0054] The position and optical characteristics of the ultrasonic module will not affect the transceiver performance. It can be implemented by selecting transparent lithium niobate material, or by using opaque ceramics in the form of tiny particles placed at the edge or in a correspondingly calibrated area.

[0055] Furthermore, a high reflective coating is provided on one side of the spectral reference plate close to the optical window.

[0056] The high-reflective coating can cover the entire surface, or it can be combined with the control and data processing modules to have high-reflective properties only in specific microstructure array areas.

[0057] Furthermore, a microstructure is arranged on a side of the optical window close to the spectrum reference plate.

[0058] Furthermore, the size of the microstructure is smaller than the working wavelength of the optical sensor device.

[0059] The method for analyzing the contaminants and super-hydrophobic properties of optical windows is based on the fact that changes in the surrounding environment of different microstructure units will affect the spectral signal near the area.

[0060] The present invention can obtain specific information of the attachment through the optical transceiver module according to the characteristics of the integrated photoelectric sensor according to the set attachment detection program. When the pollutant is an opaque attachment (the corresponding received spectral energy distribution is incomplete or the overall power is small), ultrasonic treatment and spray treatment are required to work together to remove the pollutant in a directional manner (if it is not completely removed, it is further repeated cleaning). If the detected attachment is water (or cleaning fluid and rainwater, at this time, the spectrum has a drift in the spectral peak due to the difference in the refractive index of the structural surface and the change in the electrical properties of the window), it means that the optical window no longer has super-hydrophobic properties, and the optical window needs to be dried and sprayed with low surface energy aerogel. After the whole process is completed, the spectral data in the clean state needs to be updated and stored for matching and comparison after the next startup.

[0061] The spectral reference plate can move perpendicular to the plane, providing shielding protection when it is not needed or the entire device is not in use. The spectral reference plate can be an optical window itself with a high-reflection film coated on some corresponding areas, but considering the function of the optical window, the reflection and transmission area data need to be prefabricated into the data processing system in advance. The black area of ​​the spectral reference plate is a high-reflection coating, and the coating is preferably located on the front. The reflective plate in each area can obtain the cleanliness status of each local area in the case of dot matrix operation.

[0062] By microstructuring the flat glass surface and then modifying it with aerogel spray, superhydrophobic properties can be achieved on its surface, and the attached droplets can easily roll off the surface and carry away the attached pollutants. This type of surface has better performance in subsequent cleaning effects and post-cleaning retention.

[0063] In addition to achieving superior cleaning functions through super-hydrophobic surfaces, it is also necessary to consider whether the presence of microstructures will affect the operation of the sensor. Through optical simulation, it can be found that after selecting a material with high transmittance, the presence of a microstructure of appropriate size can obtain high transmittance characteristics within the transmit and receive spectrum range.

[0064] To further evaluate the effect of the optical window with a microstructure array on the light beam, the angular spectrum transmission analysis method was used to irradiate a 10cm×10cm optical window with a Gaussian beam. By comparing the energy distribution of the optical window with a microstructure array before and after, it can be seen that the microstructure will not have a significant effect on the direction and energy distribution of the transmitted light.

[0065] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0066] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope of the present invention.

Claims

1. A self-cleaning and maintenance method for an integrated transceiver optical sensor, characterized in that: The optical transceiver module sends light information to the optical window, and the light information passes through the optical window to the spectrum reference plate and is reflected. The optical transceiver module receives the reflected light information and transmits the light information to the control and data processing module. The control and data processing module obtains the information of the attachment on the optical window according to the received light information and classifies the attachment. When the attachment is of the first type, the control and data processing module cleans the first type of attachment by a first processing method; When the attachment is of the second type, the control and data processing module cleans the second type of attachment by a second processing method; After the attachments are cleaned, the control and data processing module updates and stores the spectral data in the clean state.

2. A self-cleaning and maintaining method for a transceiver integrated optical sensor device according to claim 1, characterized in that: The first type of attachments are opaque pollutants. The first treatment method includes ultrasonic treatment and spray treatment, and the opaque pollutants are removed by ultrasonic treatment and spray treatment.

3. The self-cleaning and maintaining method of a transceiver integrated optical sensor device according to claim 1, characterized in that: The second type of attachment is a transparent liquid. The second treatment method includes ultrasonic treatment and spray treatment. The transparent liquid is removed by ultrasonic treatment, and after the removal is completed, the optical window is subjected to hydrophobic treatment by spraying.

4. A self-cleaning and maintaining method for a transceiver integrated optical sensor device according to claim 3, characterized in that: Hydrophobic treatment is achieved by spraying aerogel on the optical window.

5. A self-cleaning and maintaining method for a transceiver integrated optical sensor device according to claim 4, characterized in that: Aerogels are mixtures of silicon dioxide nanoparticles and low surface energy organic gases or mixtures of titanium dioxide nanoparticles and low surface energy organic gases.

6. A self-cleaning and maintaining method for a transceiver integrated optical sensor device according to claim 5, characterized in that: The diameters of the silica nanoparticles and the titanium dioxide nanoparticles are less than 100 nm.

7. A self-cleaning device for an integrated optical sensor, used to implement the self-cleaning and maintaining method for an integrated optical sensor according to any one of claims 1 to 6, characterized in that: include A spectral reference plate is arranged outside the optical window, and is used to reflect the light information transmitted by the optical transceiver module and passing through the optical window; A control and data processing module is arranged inside the optical window, and is used to receive light information reflected by the spectrum reference plate, and obtain information of the attachment on the optical window according to the received light information; An ultrasonic module is arranged on the inner side of the optical window, and is used to clean the attachments on the optical window; A spray module is arranged on the inner side of the optical window, and a spray end of the spray module is arranged between the optical window and the spectral reference plate. The spray module is used to clean the attachments on the optical window and perform hydrophobic treatment on the cleaned optical window.

8. The self-cleaning device for an integrated optical sensor according to claim 7, characterized in that: A high reflective coating is provided on one side of the spectrum reference plate close to the optical window.

9. The self-cleaning device for an integrated optical sensor according to claim 7, characterized in that: A microstructure is arranged on a side of the optical window close to the spectrum reference plate.

10. The self-cleaning device for an integrated optical sensor according to claim 9, characterized in that: The size of the microstructure is smaller than the working wavelength of the optical sensor device.

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