Backscattering visibility sensor for buoy

Abstract

The back scattering type visibility sensor comprises a transmitting end shell and a receiving end shell, a transmitting end circuit board and a first LED light source are arranged in the transmitting end shell, and a transmitting end circuit board, a first LED light source, a first photoelectric detector, a second photoelectric detector and a first lens are arranged in the transmitting end shell. The front side of the transmitting end shell is connected with a transmitting end protection cover; a flexible electrothermal film I is arranged on the inner side wall of the transmitting end protection cover; a receiving end circuit board, a third photoelectric detector, a second LED light source, an optical filter and a second lens are arranged in the receiving end shell, the front side of the receiving end shell is connected with a receiving end protection cover, a second flexible electrothermal film is arranged on the inner side wall of the receiving end protection cover, and the included angle between emitted light rays emitted by the first LED light source and scattered light rays received by the third photoelectric detector ranges from 120 degrees to 150 degrees. The visibility sensor disclosed by the utility model can effectively reduce the interference of background noise and improve the visibility measurement accuracy of the buoy platform.

Description

Technical Field

[0001] The utility model relates to a visibility sensor, in particular to a backscattering visibility sensor for a buoy. Background Art

[0002] Scatter visibility sensors are instruments that estimate meteorological optical range by measuring the scattering coefficient. They are currently the most widely used in meteorological observations. Scatter visibility sensors are categorized as forward scatter and backscatter based on the scattering angle. The scattering angle refers to the angle between the incident light and the scattered light. A scattering angle less than 90° is considered forward scatter, while an angle greater than 90° is considered backscatter.

[0003] In recent years, visibility sensors have become increasingly common on ocean data buoys. These sensors are typically mounted on a small circular platform atop the buoy, with various meteorological instruments mounted on a circular guardrail surrounding the platform. Forward-scatter visibility sensors typically have their light source and detector located on either side of the sensor, with the scattering angle for forward-scatter measurements typically around 45°. Light from the light source can easily strike the buoy and other nearby sensors. This reflected light then enters the photoelectric detector, severely impacting visibility measurements.

[0004] Backscatter visibility sensors feature a compact design with a transmitter and receiver that can be placed close together, making them easy to install. Existing backscatter visibility sensors, typically used at airports, have a scattering angle of 180°, with the transmitter and receiver located essentially in the same location. However, the propagation direction of this 180° backscattered light is unstable, resulting in relatively low measurement accuracy. Furthermore, the required transmitted optical power is high, increasing system power consumption. Due to the complex and volatile marine environment, the lenses of existing backscatter visibility sensors are often contaminated by water droplets, creating fog and affecting measurement accuracy. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a backscattering visibility sensor for a buoy, so as to effectively reduce the interference of background noise and improve the accuracy of visibility measurement of the buoy platform.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows:

[0007] A backscattering visibility sensor for a buoy comprises a transmitting end shell and a receiving end shell, wherein the receiving end shell is connected to one side of the transmitting end shell via a mounting base, wherein a transmitting end circuit board, an LED light source 1, a photodetector 1, a photodetector 2 and a lens 1 are arranged in the transmitting end shell, wherein the front side of the transmitting end shell is connected to a transmitting end protective cover, and wherein a flexible electric heating film 1 is arranged on the inner side wall of the transmitting end protective cover; wherein a receiving end circuit board, a photodetector 3, an LED light source 2, a filter and a lens 2 are arranged in the receiving end shell, wherein the front side of the receiving end shell is connected to a receiving end protective cover, and wherein a flexible electric heating film 2 is arranged on the inner side wall of the receiving end protective cover; wherein the angle between the emitted light emitted by the LED light source 1 and the scattered light received by the photodetector 3 is 120°-150°.

[0008] In the above solution, the second photodetector is located on the inner side wall of the transmitting end housing, the first lens is located at the front end of the transmitting end housing, and the first photodetector is located between the first LED light source and the first lens.

[0009] In the above solution, the second lens is located at the front end of the receiving end housing, and the filter is located between the third photodetector and the second lens.

[0010] In the above solution, the angle between the emitted light emitted by the LED light source 1 and the scattered light received by the photodetector 3 is 135°.

[0011] In the above solution, the LED light source 1, the photodetector 1, the photodetector 2 and the flexible electric heating film 1 are all electrically connected to the transmitting end circuit board.

[0012] In the above solution, the second LED light source, the third photodetector and the flexible electric heating film are all electrically connected to the receiving end circuit board.

[0013] Through the above technical solution, the utility model provides a backscattering visibility sensor for buoys, which has the following beneficial effects:

[0014] (1) Compared with the forward scattering visibility sensor, the backward scattering visibility sensor of the present invention has a compact structure. When used in a relatively cramped space such as a buoy platform, the light emitted by the light source at the transmitting end of the visibility sensor will not be reflected by other adjacent devices, which can effectively reduce the interference of background noise and improve the accuracy of visibility measurement on the buoy platform.

[0015] (2) Designing a photoelectric detector at the visibility transmitting end for light intensity feedback can adjust the total power and instantaneous power of the LED light source when it is working, and reduce the aging speed of the LED light source.

[0016] (3) Photodetector 2 and photodetector 3 are designed at the transmitting end and the receiving end respectively for transmittance detection, and a flexible electric heating film is used to eliminate the abnormal light transmittance caused by factors such as precipitation and seawater spray, which can improve the environmental adaptability of the visibility sensor in harsh marine working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0018] Figure 1 This is a schematic diagram of the external structure of a backscatter visibility sensor for a buoy disclosed in an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the backscatter visibility sensor for buoys;

[0020] Figure 3 This is the detection principle diagram of the backscatter visibility sensor for buoys.

[0021] In the figure, 1. Transmitter housing; 2. Receiver housing; 3. Mounting base; 4. Transmitter circuit board; 5. LED light source 1; 6. Transmitter protective cover; 7. Photodetector 1; 8. Photodetector 2; 9. Lens 1; 10. Flexible electric heating film 1; 11. Receiver circuit board; 12. Photodetector 3; 13. LED light source 2; 14. Receiver protective cover; 15. Lens 2; 16. Filter; 17. Flexible electric heating film 2; 18. Cable. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0023] The utility model provides a backscattering visibility sensor for buoys, such as Figure 1 As shown, it includes a transmitting end housing 1 and a receiving end housing 2 , and the receiving end housing 2 is connected to one side of the transmitting end housing 1 through a mounting base 3 .

[0024] like Figure 2 As shown, the transmitter housing 1 houses a transmitter circuit board 4, an LED light source 5, a photodetector 7, a photodetector 2, and a lens 9. The front side of the transmitter housing 1 is connected to a transmitter protective cover 6, the inner wall of which is provided with a flexible electric heating film 10. Photodetector 28 is located on the inner wall of the transmitter housing 1 and is used to detect the light transmittance of lens 9. Lens 9 is located at the front end of the transmitter housing 1. Photodetector 7 is located between LED light source 5 and lens 9 and is used to detect the light intensity emitted by LED light source 5.

[0025] The receiving end housing 2 houses a receiving end circuit board 11, a third photodetector 12, a second LED light source 13, a filter 16, and a second lens 15. The front side of the receiving end housing 2 is connected to a receiving end protective cover 14, the inner wall of which is provided with a second flexible electric heating film 17. The second lens 15 is located at the front end of the receiving end housing 2, and the filter 16 is located between the third photodetector 12 and the second lens 15. The third photodetector 12 is used to detect the light transmittance of the second lens 15 and also to receive scattered light.

[0026] In this embodiment, the angle between the emitted light emitted by the LED light source 1 5 and the scattered light received by the photodetector 3 12 is 135°.

[0027] LED light source 1 5 , photodetector 1 7 , photodetector 2 8 and flexible electric heating film 1 10 are all electrically connected to the transmitting end circuit board 4 , LED light source 2 13 , photodetector 3 12 and flexible electric heating film are all electrically connected to the receiving end circuit board 11 , and a cable 18 is provided outside the receiving end housing 2 .

[0028] The working process is as follows:

[0029] (1) Power on the device and complete the device self-test.

[0030] (2) Transmitter circuit board 4 drives LED light source 5. Photodetector 7 detects and obtains a light intensity signal, which is fed back to transmitter circuit board 4. This automatically adjusts the amplitude of the light pulse to maintain the light intensity of LED light source 5 at a preset value. The light emitted by LED light source 5 enters the external space through lens 9.

[0031] (3) The photoelectric detector 8 detects the intensity of light reflected by the lens 9. When the detected reflected light intensity is greater than a preset value, the flexible electric heating film 10 is activated to heat and defog the lens 9. After heating for a period of time, when the reflected light intensity is detected to be less than a preset value, the flexible electric heating film 10 is turned off.

[0032] (4) The receiving end circuit board 11 controls the operation of the LED light source 2 13, and the photodetector 3 12 detects the light intensity signal reflected by the lens 2 15. When the detected reflected light intensity is greater than a preset value, the flexible electric heating film 2 17 is activated to heat and defog the lens 2 15. After heating for a period of time, when the reflected light intensity is detected to be less than a preset value, the flexible electric heating film 2 17 is turned off.

[0033] (5) The receiving end circuit board 11 controls the LED light source 2 13 to be turned off.

[0034] (6) Light scattered from the external space enters photodetector 3 12 through lens 2 15 and filter 16. Photodetector 3 12 detects the light pulses scattered from the suspended particles and converts them into voltage signals. After pre-amplification, bandpass filtering, phase-locked amplification, low-pass filtering, A / D sampling, and data processing, the voltage signal is converted into atmospheric visibility data.

[0035] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A backscatter visibility sensor for a buoy, characterized in that: The invention comprises a transmitting end shell and a receiving end shell, wherein the receiving end shell is connected to one side of the transmitting end shell through a mounting base, wherein a transmitting end circuit board, an LED light source 1, a photodetector 1, a photodetector 2 and a lens 1 are arranged in the transmitting end shell, the front side of the transmitting end shell is connected to a transmitting end protective cover, and a flexible electric heating film 1 is arranged on the inner side wall of the transmitting end protective cover; wherein a receiving end circuit board, a photodetector 3, an LED light source 2, a filter and a lens 2 are arranged in the receiving end shell, the front side of the receiving end shell is connected to a receiving end protective cover, and a flexible electric heating film 2 is arranged on the inner side wall of the receiving end protective cover; and the angle between the emitted light emitted by the LED light source 1 and the scattered light received by the photodetector 3 is 120°-150°.

2. A backscatter type visibility sensor for a buoy according to claim 1, characterized in that: The second photoelectric detector is located on the inner side wall of the transmitting end housing, the first lens is located at the front end of the transmitting end housing, and the first photoelectric detector is located between the first LED light source and the first lens.

3. The backscatter type visibility sensor for buoy according to claim 1, characterized in that: The second lens is located at the front end of the receiving end housing, and the filter is located between the third photodetector and the second lens.

4. The backscatter type visibility sensor for a buoy according to claim 1, characterized in that: The angle between the emitted light emitted by the LED light source 1 and the scattered light received by the photodetector 3 is 135°.

5. The backscatter type visibility sensor for buoy according to claim 1, characterized in that: The LED light source 1, the photodetector 1, the photodetector 2 and the flexible electric heating film 1 are all electrically connected to the transmitting end circuit board.

6. The backscatter type visibility sensor for buoy according to claim 1, characterized in that: The second LED light source, the third photodetector and the second flexible electric heating film are all electrically connected to the receiving end circuit board.

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