Strong light protection detection module for underwater optical communication

Abstract

The utility model relates to the technical field of optical communication, in particular to a highlight protection detection module for underwater optical communication, which comprises a photoelectric detector, an optical filter is arranged at the detection end of the photoelectric detector, and a fisheye lens is tightly attached to the surface of the optical filter; the optical filter is used for suppressing stray light in a non-signal band; the fisheye lens is used for capturing more signal light by adopting a large field angle. According to the strong light protection detection module for underwater optical communication, the scheme that the fisheye lens and the optical filter are attached to the surface of the photoelectric detector after being composited and stacked is adopted to achieve strong sunlight prevention of underwater visible light communication, the fisheye lens and the optical filter serve as strong sunlight filtering, stray light of a non-signal wave band is filtered out, and therefore the strong sunlight is prevented. Meanwhile, a photodiode is adopted as a photoelectric detector, so that the module has high sensitivity and a function of responding to a wavelength matching light source, and the situation that the signal-to-noise ratio is suddenly reduced due to sunlight in a shallow sea environment is effectively avoided by adopting a narrow-band optical filter.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of optical communication, specifically is underwater optical communication's strong light protection detection module. BACKGROUND

[0002] Underwater visible light communication (UVLC) refers to a communication method that uses visible light (wavelength range: 380-790nm) for data transmission in underwater environment. Compared with traditional radio wave communication and sound wave communication, underwater visible light communication has higher transmission bandwidth, lower delay and stronger anti-interference ability. As an important development direction of future communication technology, underwater visible light communication technology has broad application prospect and research value. With the continuous progress of technology, it will play an increasingly important role in the fields of ocean development, environmental monitoring and military communication. Underwater visible light communication can also be applied in scientific research, underwater industrial facility operation and maintenance, underwater Internet of Things (IoUT) and smart ocean, pool cleaning robot and other fields.

[0003] In these fields, the current underwater communication commonly used is the underwater acoustic communication system, which uses the propagation characteristics of sound waves (frequency range: tens of Hz to hundreds of kHz) in water to transmit information. However, sound waves are mechanical waves that rely on water medium vibration for propagation, with a speed of only 100 kbps-1Mbps (short distance), and the speed is severely limited. At the same time, the sound transmission rate is low, resulting in large transmission delay.

[0004] At the same time, blue-green optical communication using low attenuation window has been extensively studied, and in recent years, underwater optical communication systems have gradually begun to be commercialized, making up for the low speed and large delay of underwater acoustic communication systems in special scenarios. The main problem is that underwater visible light communication systems use light waves (mainly blue-green light wave band, 450-550nm) to propagate in water, relying on photon energy to transmit information, with a speed of more than 10Mbps, even Gbps level.

[0005] However, the current underwater optical communication system is easily disturbed by 500-600nm water sunlight noise, and the dynamic range of the traditional receiver is insufficient, and its signal-to-noise ratio deteriorates sharply under strong background light, affecting the reception effect. Therefore, we urgently need a strong light protection detection module for underwater optical communication to further improve the effect of underwater visible light communication. Utility model content

[0006] In view of the deficiencies of the prior art, the utility model provides a strong light protection detection module for underwater optical communication, which solves the problems raised in the above background art.

[0007] To achieve the above object, the utility model discloses a strong light protection detection module of underwater optical communication, including photoelectric detector, the detection end of photoelectric detector is provided with the optical filter, the surface of optical filter is closely provided with fish eye lens,

[0008] The optical filter is used for inhibiting non-signal band stray light.

[0009] The fish eye lens is used for capturing more signal light by using a large field of view.

[0010] Optionally, the photoelectric detector includes a photodiode.

[0011] Optionally, the optical filter uses a narrow-band blue-green optical filter.

[0012] Optionally, a first transparent UV adhesive layer is arranged between the photoelectric detector and the optical filter.

[0013] Optionally, a second transparent UV adhesive layer is arranged between the optical filter and the fish eye lens.

[0014] The utility model provides a strong light protection detection module of underwater optical communication has the following beneficial effects:

[0015] 1、 this strong light protection detection module of underwater optical communication adopts the scheme of fish eye lens plus optical filter composite superposition and then adheres on the surface of photoelectric detector to realize underwater visible light communication anti strong sunlight, wherein fish eye lens plus optical filter is used as strong sunlight filter, filters out the stray light of non-signal band, and simultaneously uses photodiode as photoelectric detector, so that the module has high sensitivity (detection threshold is as low as 1nW), and the wavelength matching light source function is responded, in the anti -interference design, through the adoption of narrow -band optical filter, only allows the wavelength of light source to pass through, effectively avoids the situation that the signal-to-noise ratio sharply drops due to sunlight in shallow sea environment.

[0016] 2、 this strong light protection detection module of underwater optical communication, wherein fish eye lens is closely assembled with optical filter and is set, directly filters incident light, reduces internal reflection stray light, can maximize the inhibition of ambient light into the optical system, simultaneously, the module is small in size, can adapt to the deployment demand of micro or small underwater equipment, makes its equipment concealment higher, is not easy to be detected by echo sounder, avoids the interference to marine organisms, and its setting through underwater optical communication avoids the situation that the delay is higher, real-time is poor and high-definition video transmission cannot be supported in traditional use of sound wave transmission information. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the utility model schematic diagram.

[0018] In the figure: 1, photoelectric detector; 2, optical filter; 3, fisheye lens; 4, first transparent UV glue layer; 5, second transparent UV glue layer. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0020] Please refer to Figure 1 The utility model provides technical scheme: underwater light communication's strong light protection detection module, including photoelectric detector 1, the inside of photoelectric detector 1 includes photodiode, to make this module have high sensitivity (detection threshold is as low as 1nW), response wavelength matches light source function, the detection end of photoelectric detector 1 is provided with optical filter 2, and photoelectric detector 1 is provided with first transparent UV glue layer 4 between optical filter 2, and the surface of optical filter 2 is closely provided with fisheye lens 3, and optical filter 2 is provided with second transparent UV glue layer 5 between fisheye lens 3;

[0021] The scheme of adopting fisheye lens 3 plus optical filter 2 compound superposition and then attaching on the surface of photoelectric detector 1 is used to realize underwater visible light communication against strong sunlight, wherein fisheye lens 3 plus optical filter 2 are used as strong sunlight filter to filter out stray light of non-signal waveband, and can also adapt to the deployment requirements of miniaturized underwater equipment, and the module has short focal length and high light collection rate simultaneously: more light energy is collected through large aperture (F number is as low as f / 1.4), the underwater light attenuation is compensated, the optical filter 3 is closely attached to the front end of fisheye lens 2, the incident light is directly filtered, the internal reflection stray light is reduced (more than 30% noise coupling is reduced), the environmental light entering the optical system can be maximally inhibited, and the sunlight interference situation of sudden drop of signal-to-noise ratio caused by sunlight (especially blue-green light waveband) in shallow sea environment can be effectively avoided.

[0022] Optical filter 2, optical filter 2 adopts narrow-band blue-green optical filter (for example, center wavelength 520nm±5nm), is used to inhibit stray light of non-signal waveband (such as sunlight main peak noise near 550nm), can make stray light attenuation ratio reach 10^3 order of magnitude, to only allow light source wavelength to pass.

[0023] Fisheye lens 3 is used to capture more signal light by using large field of view angle (FoV, up to 180°~220° super large field of view angle), breaks through the field of view limitation (usually <120°) of traditional lens, adapts to dynamic communication scene (such as AUV random direction communication), covers omnidirectional signal, and effectively solves the situation that light signal is seriously attenuated due to suspended particles in turbid water.

[0024] In the utility model, the working steps of the device are as follows:

[0025] The underwater robot using the module receives the signal light causing the water surface light communication buoy through the fisheye lens 3 when detecting underwater operation, and the non-signal wave band stray light is suppressed by the narrow band blue-green filter 2, so that the photoelectric detector 1 using the photodiode accurately and quickly receives the signal.

[0026] The above merely describes a preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A strong light protection detection module for underwater optical communication, characterized in that: The application relates to a photoelectric detector (1), wherein a filter (2) is arranged at the detecting end of the photoelectric detector (1), and a fisheye lens (3) is arranged on the surface of the filter (2). The filter (2) is used for inhibiting non-signal wave band stray light. The fisheye lens (3) is used for capturing more signal light by adopting a large visual field angle.

2. The strong light protection detection module for underwater optical communication according to claim 1, characterized in that: The photoelectric detector (1) comprises a photodiode.

3. The strong light protection detection module for underwater optical communication according to claim 1, characterized in that: The filter (2) adopts a narrow-band blue-green filter.

4. The strong light protection detection module for underwater optical communication according to claim 1, characterized in that: A first transparent UV glue layer (4) is arranged between the photoelectric detector (1) and the filter (2).

5. The strong light protection detection module for underwater optical communication according to claim 1, characterized in that: A second transparent UV glue layer (5) is arranged between the filter (2) and the fisheye lens (3).

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