Self-cleaning device and method for reflectors

Abstract

This invention belongs to the field of spectral technology, specifically relating to a self-cleaning device and method for a reflector. The reflector has a reflective surface. The device includes a light intensity detection unit disposed on the back of the reflector to obtain the light intensity of transmitted light passing through the reflector from each light spot on the reflective surface. A calculation unit is used to obtain the difference between the light intensity and its normal value, where the normal value is the light intensity of transmitted light when the area of ​​the reflective surface corresponding to the light spot is clean. A controller outputs a cleaning intensity corresponding to the light spot based on the difference. A cleaning unit cleans the area corresponding to the light spot on the reflective surface according to the cleaning intensity. This invention has advantages such as automation and good effect, and is applied to the cleaning of open-circuit reflectors.

Description

Technical Field

[0001] This invention relates to the field of spectroscopy, and in particular to a self-cleaning device and method for mirrors. Background Technology

[0002] Currently, for open-circuit optical systems with a high number of reflections, the reflectivity of the specular surface is easily affected by factors such as dust and rain in the air, resulting in a loss of light intensity, a low signal-to-noise ratio, and affecting the measurement results of the instrument.

[0003] To solve the above problems, the following solutions are currently commonly used:

[0004] 1. Manual solution, which involves high-frequency maintenance and manual wiping of the lenses. However, maintenance in the field is costly and difficult, and frequent wiping can easily damage the lenses.

[0005] 2. Automated solution: This involves periodically spraying cleaning fluid onto the lens surface and using a high-speed motor to rotate the lens for cleaning. However, this method consumes a large amount of cleaning fluid, and the cleaning effect depends on the normal operation of the motor. It cannot perform efficient cleaning in a targeted manner. Summary of the Invention

[0006] To address the shortcomings of the existing technical solutions, the present invention provides a self-cleaning device for a reflector.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A self-cleaning device for a reflector, wherein the reflector has a reflective surface; the self-cleaning device comprises:

[0009] A light intensity detection unit is disposed on the back of the reflector to obtain the light intensity of the transmitted light passing through the reflector from each light spot on the reflective surface.

[0010] A calculation unit is used to obtain the difference between the light intensity and its normal value, wherein the normal value is the light intensity of transmitted light when the reflective surface area corresponding to the light spot is clean.

[0011] The controller outputs a cleaning intensity corresponding to the light spot based on the difference;

[0012] A cleaning unit that cleans the area corresponding to the light spot on the reflective surface according to the cleaning intensity.

[0013] The present invention also aims to provide a self-cleaning method for a reflector, which is achieved through the following technical solution.

[0014] A self-cleaning method for a reflector, the method comprising the following steps:

[0015] A1. A light intensity detection unit located on the back of the reflector obtains the light intensity of the transmitted light passing through the reflector from each light spot on the reflective surface;

[0016] A2. The calculation unit obtains the difference between the light intensity and its normal value, where the normal value is the light intensity of transmitted light when the reflective surface area corresponding to the light spot is clean.

[0017] A3. The controller outputs the cleaning intensity corresponding to the light spot based on the difference;

[0018] A4. The cleaning unit cleans the area corresponding to the light spot on the reflective surface according to the cleaning intensity.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. Accurate identification;

[0021] The light intensity detection unit accurately identifies the precise location of contamination on the reflective surface of the mirror, and the cleaning unit cleans the contamination location in a targeted manner, eliminating the need for regular and large-area cleaning, saving cleaning fluid and reducing maintenance costs;

[0022] 2. Stable operation;

[0023] The reflector does not need to be moved, which enhances the stability of the optical path;

[0024] The combined use of cleaning fluid and gas purging improves the cleanliness of the reflective surface by enhancing the hydrophobic film on the reflective surface, thus ensuring optical performance.

[0025] 3. Simple structure;

[0026] The light intensity detection unit and the cleaning unit can be mounted on the same rotating arm. When it rotates, the same light spot is detected and cleaned, which reduces the structural complexity of the cleaning device and improves its reliability. Attached Figure Description

[0027] The disclosure of this invention will become more readily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are merely illustrative of the technical solutions of this invention and are not intended to limit the scope of protection of this invention. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of the self-cleaning device for the reflector of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the reflector of the present invention;

[0030] Figure 3 This is a schematic diagram of the cleaning unit structure of the present invention;

[0031] Figure 4This is a schematic diagram of another self-cleaning device for a reflector according to the present invention.

[0032] In the attached diagram, 11-reflector, 111-reflecting surface, 21-light spot, 30-light intensity detection unit, 31-first rotating arm, 32-detector, 511-nozzle, 512-cleaning fluid tank, 513-transfer pump, 514-air storage tank, 515-ballast tank, 516-first solenoid valve, and 517-second solenoid valve. Detailed Implementation

[0033] Figures 1-4 The following description illustrates optional embodiments of the invention to teach those skilled in the art how to implement and reproduce the invention. Some conventional aspects have been simplified or omitted to teach the technical solutions of the invention. Those skilled in the art should understand that variations or substitutions derived from these embodiments will be within the scope of the invention. Those skilled in the art should understand that the following features can be combined in various ways to form multiple variations of the invention. Therefore, the invention is not limited to the optional embodiments described below, but is defined only by the claims and their equivalents.

[0034] Example 1

[0035] This embodiment provides a self-cleaning device for a reflector, such as... Figure 1 As shown, the self-cleaning device includes:

[0036] like Figure 2 As shown, the reflector 11 has a reflective surface 111, on which multiple light spots 21 are evenly distributed and located on concentric circles.

[0037] The light intensity detection unit 30 is disposed on the back of the reflector 11 to obtain the light intensity of the transmitted light of each light spot 21 on the reflective surface 111 passing through the reflector 11.

[0038] The calculation unit is used to obtain the difference between the light intensity and its normal value, which is the light intensity of the transmitted light when the area of ​​the reflective surface 111 corresponding to the light spot 21 is clean.

[0039] The controller outputs the cleaning intensity corresponding to the light spot 21 based on the difference.

[0040] The cleaning unit cleans the area corresponding to the light spot 21 on the reflective surface 111 according to the cleaning intensity.

[0041] To accurately obtain light intensity without affecting the original optical path, further, such as Figure 1 The light intensity detection unit 30 includes:

[0042] The detector 32 is mounted on the first rotating arm 31.

[0043] The controller controls the first drive module. When the first rotating arm 31 rotates under the drive of the first drive module, the detector 32 receives the transmitted light from each light spot 21 in time intervals.

[0044] To match the ratio and cleaning intensity, the difference is further defined as the ratio Q, and the correspondence between the ratio Q and the cleaning intensity W is as follows:

[0045] When Q < 20%, the cleaning intensity is W3;

[0046] When 20%≤Q<30%, the cleaning intensity is W2;

[0047] When 30%≤Q<40%, the cleaning intensity is W1;

[0048] When 40%≤Q<50%, the cleaning intensity is W0, W0<W1<W2<W3.

[0049] In order to accurately clean the contaminated areas on the reflective surface 111, such as Figure 3 As shown, the cleaning unit includes:

[0050] The nozzle 511 and the cleaning fluid tank 512 are connected by a first pipe.

[0051] The delivery pump 513 is installed on the first pipeline.

[0052] The switching module is used to selectively connect the nozzle 511 to either the first pipe or the second pipe.

[0053] The second pipeline connects the switching module and the gas storage tank 514, and the ballast tank 515 is installed on the second pipeline.

[0054] To obtain accurate cleaning intensity, the cleaning intensity W is further defined as: W = k·L·P 0.5 k is a constant related to nozzle 511, and L and P are the flow rate and pressure in the first pipe, respectively.

[0055] To accurately clean the contaminated areas on the reflective surface 111, the cleaning unit further includes:

[0056] Nozzle 511 is disposed on the second rotating arm.

[0057] When the second rotating arm rotates under the drive of the second drive module, the cleaning liquid or gas sprayed from the nozzle 511 cleans the area corresponding to the light spot 21 on the reflective surface 111.

[0058] To reduce structural complexity, the cleaning unit and the light intensity detection unit 30 rotate synchronously around the central axis of the reflector 11 and correspond to the same light spot 21.

[0059] The self-cleaning method for a reflector according to an embodiment of the present invention includes the following steps:

[0060] A1. The light intensity detection unit 30, located on the back of the reflector 11, obtains the light intensity of the transmitted light passing through the reflector 11 from each light spot 21 on the reflective surface 111.

[0061] A2. The calculation unit obtains the difference between the light intensity and its normal value, where the normal value is the light intensity of the transmitted light when the area of ​​the reflective surface 111 corresponding to the light spot 21 is clean.

[0062] A3. The controller outputs the cleaning intensity corresponding to the light spot 21 based on the difference.

[0063] A4. The cleaning unit cleans the area corresponding to the light spot 21 on the reflective surface 111 according to the cleaning intensity.

[0064] To accurately obtain the light intensity without affecting the original optical path, in step A1, the light intensity is obtained in the following way:

[0065] The detector 32 rotates around the central axis of the reflector 11 to obtain the light intensity transmitted through the reflector 11 by each light spot 21.

[0066] To reduce structural complexity, the cleaning unit and the detector 32 rotate synchronously, and the light spot 21 corresponding to the nozzle 511 outlet of the cleaning unit 50 is the same as the light spot 21 corresponding to the detector 32.

[0067] Example 2

[0068] An application example of the self-cleaning device and method for a reflector according to Embodiment 1 of the present invention.

[0069] In this application example, such as Figure 1 As shown, the light intensity detection unit 30 includes a first rotating arm 31 and a detector 32. The detector 32 is mounted on the first rotating arm 31. The controller controls the first drive module (a motor is used in this embodiment). When the first rotating arm 31 rotates under the drive of the first drive module, the detector 32 receives the transmitted light from each light spot 21 in a time-sharing manner. That is, the radius of the concentric circle where the light spot 21 is located is the same as the rotation radius of the detector 32, so that when the detector 32 rotates at a fixed angle, it can accurately receive the light intensity of the transmitted light from the light spot 21.

[0070] The cleaning unit includes a second rotating arm and a nozzle 511, which are shared by the first rotating arm 31. The nozzle 511 is fixed on the first rotating arm 31 and rotates synchronously with the detector 32. The fluid ejected from the nozzle 511 accurately impacts the reflective surface 111 where the light spot 21 is located, so that the nozzle 511 and the detector 32 correspond to the same light spot 21.

[0071] like Figure 2 As shown, the reflective surface 111 of the reflector 11 is coated with a reflective film, and the reflective surface 111 has 10 light spots 21 that are evenly distributed around the center on concentric circles.

[0072] like Figure 3 As shown, the switching module employs a combination of a first solenoid valve 516 and a second solenoid valve 517. The cleaning fluid tank 512 is sequentially connected to a delivery pump 513 (peristaltic pump) and a second solenoid valve 517 via a first pipe. The air tank 514 is sequentially connected to a ballast tank 515 and a first solenoid valve 516 via a second pipe. When the switching module switches, the nozzle 511 selectively connects to either the air tank 514 or the cleaning fluid tank 512. A sensor is also installed on the first pipe to obtain the flow rate and pressure within it.

[0073] The calculation unit is used to obtain the ratio Q of the light intensity and its normal value, where the normal value is the light intensity of transmitted light when the area of ​​the reflective surface 111 corresponding to the light spot 21 is clean. The controller outputs a cleaning intensity corresponding to the light spot 21 based on the difference, and the cleaning intensity is controlled by the delivery pump 513.

[0074] The relationship between the ratio Q and the cleaning intensity W is as follows:

[0075] When Q < 20%, the cleaning intensity is W3 = 2.5 kgf (kilogram force), and the cleaning time is 10 min.

[0076] When 20%≤Q<30%, the cleaning intensity is W2=2kgf and the cleaning time is 5min.

[0077] When 30%≤Q<40%, the cleaning intensity is W1=1.5kgf and the cleaning time is 3min.

[0078] When 40%≤Q<50%, the cleaning intensity is W0=1kgf and the cleaning time is 2min.

[0079] The cleaning intensity W = k·L·P 0.5 k is a constant related to nozzle 511, k = 0.0456 (kgf) 1 / 2 .min / cm 2 L and P are the flow rate and pressure in the first pipe, respectively, which are adjusted by the delivery pump 513.

[0080] The self-cleaning method for a reflector according to this invention, i.e., the working method of the device in this embodiment, includes the following steps:

[0081] A1. The controller sends a rotation command to the first drive module. The first drive module controls the first rotating arm 31 to rotate 36 degrees according to the rotation command, so that the detector 32 receives the transmitted light intensity of the light spot 21.

[0082] A2. The calculation unit obtains the ratio Q of the light intensity and its normal value, where the normal value is the light intensity of the transmitted light when the area of ​​the reflective surface 111 corresponding to the light spot 21 is clean.

[0083] A3. The controller outputs the cleaning intensity corresponding to the light spot 21 according to the ratio Q.

[0084] When Q < 20%, the cleaning intensity is W3 = 2.5 kgf, and the cleaning time is 10 min.

[0085] When 20%≤Q<30%, the cleaning intensity is W2=2kgf and the cleaning time is 5min.

[0086] When 30%≤Q<40%, the cleaning intensity is W1=1.5kgf and the cleaning time is 3min.

[0087] When 40%≤Q<50%, the cleaning intensity is W0=1kgf and the cleaning time is 2min.

[0088] A4. The cleaning unit cleans the area corresponding to the light spot 21 on the reflective surface 111 according to the cleaning intensity, specifically in the following manner:

[0089] The second solenoid valve 517 is opened, the first solenoid valve 516 is closed, the controller adjusts the delivery pump 513, and the sensor provides feedback on the flow rate and pressure in the first pipeline, resulting in a cleaning intensity W = k·L·P. 0.5 The controller's output cleaning intensity value is reached.

[0090] After cleaning is completed, close the second solenoid valve 517 and open the first solenoid valve 516. Compressed air in the air tank 514 passes through the ballast chamber 515 and the first solenoid valve 516 in sequence and is sprayed out from the nozzle 511 to blow away the reflective surface 111 of the light spot 21 that has just been cleaned.

[0091] Example 3

[0092] The application example of the self-cleaning device and method for the reflector in Embodiment 1 of the present invention differs from that in Embodiment 2 in that:

[0093] like Figure 4As shown, the nozzle 511 no longer rotates around the central axis of the reflector 11, but is fixed. However, the nozzle 511 is driven by a three-dimensional adjustment unit to rotate around a first axis parallel to the central axis, and the angle between the nozzle 511 outlet direction and the first axis is adjusted (i.e., the pitch angle is adjusted) so that the outlet of the nozzle 511 corresponds to the area of ​​the reflective surface 111 where the selected light spot 21 is located, thereby cleaning and drying.

[0094] In this embodiment, the plane containing the n light spots 21 is taken as the coordinate plane, the distance of the light spot 21 relative to the center of the coordinate plane (coordinate (0,0)) is r, and the initial position is (0,r). The initial position is the position of the light spot 21 when the detector 32 starts to rotate.

[0095] The detector 32 rotates clockwise at equal intervals by an angle of θ, where θ = 360 / n.

[0096] When detector 32 rotates clockwise from 0 to 90 degrees, x i =r·sinθ,y i =r·cosθ,i=1,2···(n-1).

[0097] When detector 32 rotates clockwise 90~180°, x i =r·cos(θ-π / 2), y i =-r·sin(θ-π / 2) .

[0098] When detector 32 rotates clockwise 180~270°, x i =-r·sin(θ-π), y i =-r·cos(θ-π).

[0099] When detector 32 rotates clockwise 270~360°, x i =r·cos(θ-3π / 2), y i =r·sin(θ-3π / 2).

[0100] Subsequently, the controller determines the coordinates (x, y) of the contaminated light spot 21. i , y i The coordinates (x0, y0) of the projection of nozzle 511 onto the coordinate plane are calculated, the angle that nozzle 511 needs to rotate is calculated, and the nozzle 511 is controlled and adjusted according to the command.

[0101] The horizontal rotation angle that needs to be adjusted for nozzle 511 is α = arctan[(x0-x i ) / (y0-y i )).

[0102] Adjusted pitch angle h is the distance between nozzle 511 and the coordinate plane.

Claims

1. A mirror self-cleaning device, said mirror having a reflecting surface; characterized in that, The self-cleaning device comprises: a light intensity detection unit arranged on the back of the mirror to obtain the light intensity of the transmission light of each light spot on the reflecting surface passing through the mirror; a calculation unit for obtaining the difference between the light intensity and its normal value, the normal value being the light intensity of the transmission light when the light spot corresponding reflecting surface area is clean; a controller for outputting the cleaning intensity corresponding to the light spot according to the difference; a cleaning unit for cleaning the area on the reflecting surface corresponding to the light spot according to the cleaning intensity; The light intensity detection unit comprises a detector, a first rotating arm and a first driving module, the detector being arranged on the first rotating arm; the controller controls the first driving module, and when the first rotating arm rotates under the driving of the first driving module, the detector receives the transmission light of each light spot in time; The cleaning unit comprises: a nozzle and a cleaning liquid tank, the nozzle and the cleaning liquid tank being connected through a first pipeline; a delivery pump arranged on the first pipeline; a switching module for selectively connecting the nozzle to the first pipeline or a second pipeline; a gas storage tank, the second pipeline connecting the switching module and the gas storage tank; The controller calculates the rotation angle of the nozzle according to the pollution light spot coordinates (x i , y i ), i=1,2···(n-1), the coordinates (x0,y0) of the nozzle projection on the coordinate plane, the horizontal rotation angle α=arctan[(x0-x i ) / (y0-y i )], and the pitch angle , wherein h is the distance between the nozzle and the coordinate plane. Taking the plane where the n light spots are located as the coordinate plane, the distance of the light spot relative to the center (0, 0) of the coordinate plane is r, and the initial position is (0, r), which is the position of the light spot corresponding to the start of the rotation of the detector.

2. The mirror self-cleaning device according to claim 1, characterized in that, The difference is the ratio Q, and the corresponding relationship between the ratio Q and the cleaning intensity W is as follows: When Q < 20%, the cleaning intensity is W3; When 20% ≤ Q < 30%, the cleaning intensity is W2; When 30% ≤ Q < 40%, the cleaning intensity is W1; When 40% ≤ Q < 50%, the cleaning intensity is W0, and W0 < W1 < W2 < W3.

3. The mirror self-cleaning device according to claim 1, wherein The cleaning intensity W = k - L - P 0.5 k is a constant related to the nozzle, L and P are the flow rate and pressure in the first duct, respectively.

4. The mirror self-cleaning device according to claim 1, wherein The cleaning unit further comprises: a second rotating arm, the nozzle being arranged on the second rotating arm; a second driving module, when the second rotating arm rotates under the driving of the second driving module, the cleaning liquid or gas sprayed by the nozzle cleans the area on the reflecting surface corresponding to the light spot.

5. The mirror self-cleaning device according to claim 1, wherein The cleaning unit and the light intensity detection unit rotate synchronously around the central axis of the mirror and correspond to the same light spot.

6. The apparatus-implemented mirror self-cleaning method of claim 1, wherein, The method comprises the following steps: A1. The light intensity detection unit arranged on the back of the mirror obtains the light intensity of the transmission light of each light spot on the reflecting surface passing through the mirror; the light intensity is obtained by rotating the detector around the central axis of the mirror to obtain the light intensity of the transmission light of each light spot passing through the mirror; A2. The calculation unit obtains the difference between the light intensity and its normal value, the normal value being the light intensity of the transmission light when the light spot corresponding reflecting surface area is clean; A3. The controller outputs the cleaning intensity corresponding to the light spot according to the difference; A4. The cleaning unit cleans the area on the reflecting surface corresponding to the light spot according to the cleaning intensity.

7. The method of claim 6, wherein, The cleaning unit and the detector rotate synchronously, and the nozzle outlet of the cleaning unit corresponds to the same light spot as the detector.

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