Solar blind deep ultraviolet wireless optical communication device based on photomultiplier

Abstract

The invention relates to a solar blind deep ultraviolet wireless optical communication device based on a photomultiplier. The solar blind deep ultraviolet wireless optical communication device based on the photomultiplier comprises a main processing structure, a transmitting structure and a receiving structure, the main processing structure comprises a transceiver circuit used for receiving a first signal from an external information source; the emitting structure comprises a plurality of light-emitting diodes, the light-emitting diodes are used for emitting first optical signals loaded with first signals to the outside, and the light-emitting diodes are deep ultraviolet light-emitting diodes; the receiving structure comprises at least one photomultiplier and a deep ultraviolet optical filter, the deep ultraviolet optical filter is used for filtering optical signals except the deep ultraviolet optical signals, and the photomultiplier is used for receiving second optical signals penetrating through the deep ultraviolet optical filter. According to the invention, the deep ultraviolet wireless optical communication can realize kilometer-level communication data transmission in a direct sunlight environment, and the wireless optical communication distance in the direct sunlight environment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless optical communication, and in particular to a solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube. Background Art

[0002] Optical communication technology transmits information by controlling the on and off of LEDs (light-emitting diodes). The current most advanced visible light communication can achieve a transmission rate of Gb / s. Traditional radio signal transmission equipment has many limitations, such as high prices and low efficiency. For example, mobile phones have millions of base stations built around the world to enhance mobile phone transmission signals, but most of the energy is consumed in equipment cooling, and the energy efficiency is only 5%. In contrast, optical communication technology essentially transmits information through optical signals. The required transmission equipment only requires LEDs, and does not occupy existing frequency band resources, so there will be no mutual interference with existing frequency band equipment, making visible light communication have good communication quality and confidentiality, and more green and environmentally friendly. As a backup solution for radio frequency communication, optical communication is increasingly valued by universities and research institutions. However, the current wireless optical communication device has a short transmission distance, especially in special environments (such as direct sunlight), which limits the expansion of the application field of wireless optical communication technology.

[0003] Therefore, how to improve the effectiveness and transmission distance of wireless optical communication technology in special environments (such as direct sunlight environments) so as to expand the application areas of wireless optical communication technology is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The present invention provides a solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube, which is used to improve the transmission effectiveness and transmission distance of wireless optical communication technology in a direct sunlight environment, thereby expanding the application field of wireless optical communication technology.

[0005] According to some embodiments, the present invention provides a solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube, comprising a main processing structure, a transmitting structure and a receiving structure; wherein,

[0006] The main processing structure includes a transceiver circuit, and the transceiver circuit is used to receive a first signal from an external source;

[0007] The emission structure is electrically connected to the main processing structure, and includes a plurality of light emitting diodes, wherein the light emitting diodes are used to emit a first optical signal loaded with the first signal to the outside, and the light emitting diodes are deep ultraviolet light emitting diodes;

[0008] The receiving structure is electrically connected to the main processing structure, and includes at least one photomultiplier tube and a deep ultraviolet filter located on the light incident surface of the photomultiplier tube, the deep ultraviolet filter is used to filter out light signals other than deep ultraviolet light signals, and the photomultiplier tube is used to receive a second light signal passing through the deep ultraviolet filter.

[0009] In some embodiments, the transmitting structure further comprises:

[0010] A driver, configured to receive the first signal from the main processing structure;

[0011] a transistor, wherein a gate electrode of the transistor is electrically connected to the driver, a drain electrode of the transistor is electrically connected to a cathode of the light-emitting diode, and the transistor is used to load the first signal to the light-emitting diode;

[0012] A power supply is electrically connected to the light emitting diode and is used to supply power to the light emitting diode.

[0013] In some embodiments, the transmitting structure further comprises:

[0014] The first ultraviolet-coated anti-reflection lens is located on the light-emitting surface of the light-emitting diode and is used for focusing the first optical signal.

[0015] In some embodiments, the emitting structure includes three light emitting diodes.

[0016] In some embodiments, the photomultiplier tube is further used to convert the received second light signal into a photocurrent signal; and the receiving structure further includes:

[0017] a transimpedance amplifier, electrically connected to the photomultiplier tube, and configured to convert the photocurrent signal into a photovoltage signal;

[0018] A DC bias device, electrically connected to the transimpedance amplifier, for raising the photovoltage signal;

[0019] A signal determiner is electrically connected to the DC bias device, and is used to determine the raised photovoltage signal and output a second TTL signal to the main processing structure.

[0020] In some embodiments, the receiving structure further includes:

[0021] The second ultraviolet-coated anti-reflection lens is located on a side of the deep ultraviolet filter away from the photomultiplier tube and is used for focusing the optical signal entering the receiving structure.

[0022] In some embodiments, the main processing structure further includes:

[0023] A modulation circuit, electrically connected to the transceiver circuit, configured to modulate the first signal into a first TTL signal and then transmit the first signal to the transmitting structure;

[0024] A demodulation circuit is electrically connected to the transceiver circuit and is used to demodulate the second TTL signal output by the receiving structure.

[0025] In some embodiments, the modulation circuit is an FSK modulation circuit, and the demodulation circuit is an FSK demodulation circuit; the main processing structure further includes:

[0026] A FIFO data register is electrically connected to the transceiver circuit, the modulation circuit and the demodulation circuit, and is used to store the first signal and the second signal.

[0027] In some embodiments, the main processing structure further includes an input interface and an output interface electrically connected to the transceiver circuit, the input interface being used to electrically connect to an external information source, and the output interface being used to electrically connect to an external information sink;

[0028] The input interface and the output interface are any one of an RS232 interface, an RS485 interface, an RS499 interface, an RS422 interface, a USB interface and an RJ45 interface.

[0029] In some embodiments, the wavelengths of the first optical signal and the second optical signal are both 275 nm.

[0030] The photomultiplier tube-based solar-blind deep ultraviolet wireless optical communication device provided by the present invention is configured with at least one photomultiplier tube and a deep ultraviolet filter located on the light incident surface of the photomultiplier tube in a receiving structure, wherein the deep ultraviolet filter is used to filter out light signals other than deep ultraviolet light signals, and the photomultiplier tube is used to receive a second light signal passing through the deep ultraviolet filter, thereby utilizing the characteristics of deep ultraviolet light signals that are not interfered by sunlight, are invisible, and are resistant to electromagnetic interference, so that wireless optical communication technology can be applied to the field of solar-blind communication, and utilizing the high sensitivity and high gain of the photomultiplier tube so that deep ultraviolet wireless optical communication can achieve kilometer-level communication data transmission in a direct sunlight environment, thereby extending the wireless optical communication distance in a direct sunlight environment, so that the photomultiplier tube-based solar-blind deep ultraviolet wireless optical communication device can be used as an effective, safe, and real-time emergency supplementary communication means in special environments, thereby expanding the application field of wireless optical communication technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube in a specific implementation manner of the present invention;

[0032] Figure 2is a schematic structural diagram of an emission structure in a specific embodiment of the present invention;

[0033] Figure 3 is a structural schematic diagram of a receiving structure in a specific implementation manner of the present invention;

[0034] Figure 4 is a schematic diagram of a main processing structure in a specific embodiment of the present invention;

[0035] Figure 5 It is a schematic structural diagram of two solar-blind deep ultraviolet wireless optical communication devices based on photomultiplier tubes communicating in a specific implementation manner of the present invention;

[0036] Figure 6 It is a schematic diagram of broadcast communication in a specific implementation manner of the present invention. DETAILED DESCRIPTION

[0037] The specific implementation of the solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube provided by the present invention is described in detail below with reference to the accompanying drawings.

[0038] This specific embodiment provides a solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube. Figure 1 is a schematic structural diagram of a solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube in a specific implementation manner of the present invention, Figure 2 is a schematic diagram of the structure of the emission structure in a specific embodiment of the present invention, Figure 3 is a structural diagram of a receiving structure in a specific embodiment of the present invention, Figure 4 is a schematic diagram of the main processing structure in a specific embodiment of the present invention, Figure 5 1 is a schematic diagram of the structure of two solar-blind deep ultraviolet wireless optical communication devices based on photomultiplier tubes communicating in a specific embodiment of the present invention. Figure 1-Figure 5 As shown, the solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube includes a main processing structure 10, a transmitting structure 11 and a receiving structure 12; wherein,

[0039] The main processing structure 10 includes a transceiver circuit 101, and the transceiver circuit 101 is used to receive a first signal from an external source;

[0040] The emission structure 11 is electrically connected to the main processing structure 10, and includes a plurality of light emitting diodes 111, wherein the light emitting diodes 111 are used to emit a first optical signal L1 loaded with the first signal to the outside, and the light emitting diodes 111 are deep ultraviolet light emitting diodes;

[0041] The receiving structure 12 is electrically connected to the main processing structure 10, and includes at least one photomultiplier tube 121 and a deep ultraviolet filter 122 located on the light incident surface of the photomultiplier tube 121, the deep ultraviolet filter 122 is used to filter out light signals other than deep ultraviolet light signals, and the photomultiplier tube 121 is used to receive a second light signal L2 passing through the deep ultraviolet filter 122.

[0042] For example, the external device 40 includes a webcam, a computer (PC), a network sensor, etc. Any one of the external devices 40 can be used as the external information source, and another one of the external devices 40 (i.e., a device different from the external information source) can be used as the external information destination. The main processing structure 10 includes the transceiver circuit 101, and the transceiver circuit 101 includes a receiving circuit 1011 and a transmitting circuit 1012. The receiving circuit 1011 is used to receive the first signal transmitted from the external device 40 to the main processing structure 10, and transmit the first signal to the transmitting structure 11 after processing the first signal. The transmitting structure 11 includes a plurality of light emitting diodes 111, and the light emitting diodes 111 are deep ultraviolet light emitting diodes that can emit deep ultraviolet light signals, so that the first optical signal L1 loaded with the first signal can be emitted to the outside in the form of deep ultraviolet light to realize signal transmission through deep ultraviolet wireless optical signals. The receiving structure 12 includes at least one photomultiplier tube 121 and a deep ultraviolet filter 122 located on the light incident surface of the photomultiplier tube 121. The light signal from the outside is filtered by the deep ultraviolet filter 122 before entering the photomultiplier tube 121. Since the deep ultraviolet filter 122 can filter out light signals outside the deep ultraviolet band (that is, the deep ultraviolet filter 122 only allows light signals in the deep ultraviolet band to penetrate), it can reduce sunlight and other light background noise, thereby ensuring the accuracy and reliability of the light signal received by the receiving structure 12. In this specific embodiment, the first light signal L1 and the second light signal L2 are both light signals in the deep ultraviolet band.

[0043] This specific implementation method utilizes the characteristics of deep ultraviolet light signals that are not interfered by sunlight, invisible, and resistant to electromagnetic interference, so that wireless optical communication technology can be applied to the field of day-blind communication. Moreover, since the ozone layer in the stratosphere has a strong absorption effect on ultraviolet rays near a wavelength of 250nm, the deep ultraviolet radiation in the wavelength range of 200 to 280nm in sunlight is almost attenuated to zero near the sea level. Therefore, the day-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube placed on the sea level can work all day without being interfered by sunlight. In addition, by utilizing the high sensitivity and high gain of the photomultiplier tube, deep ultraviolet wireless optical communication can achieve kilometer-level communication data transmission in a direct sunlight environment, thereby extending the wireless optical communication distance in a direct sunlight environment, so that the day-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube can be used as an effective, safe and real-time emergency supplementary communication means in special environments, expanding the application field of wireless optical communication technology.

[0044] In some embodiments, Figure 1 and Figure 2 As shown, the transmitting structure 11 further includes:

[0045] A driver 113, configured to receive the first signal from the main processing structure 10;

[0046] A transistor 112, wherein a gate electrode of the transistor 112 is electrically connected to the driver 113, a drain electrode of the transistor 112 is electrically connected to a cathode of the light-emitting diode 111, and the transistor 112 is used to load the first signal to the light-emitting diode 111;

[0047] The power supply 114 is electrically connected to the light emitting diode 111 and is used to supply power to the light emitting diode 111 .

[0048] In some embodiments, the transmitting structure 11 further includes:

[0049] The first UV-coated anti-reflection lens is located on the light-emitting surface of the light-emitting diode 111 and is used to focus the first optical signal.

[0050] In some embodiments, the emitting structure 11 includes three light emitting diodes 111 .

[0051] For example, the transistor 112 may be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). In one example, the emission structure 11 further includes a current amplifier 115. The current amplifier 115 receives the first signal output by the main processing structure 10 for amplification processing, and transmits the amplified first signal to the 113 to drive the gate electrode of the MOSFET. The light-emitting diode 111 is powered by the power supply 114, and the drain electrode of the MOSFET is connected to the cathode of the light-emitting diode 111. The light-emitting diode 111 converts the electrical signal into the first optical signal L1 and transmits it to the outside. In one example, the power supply 114 is a DC / DC converter. By arranging the first ultraviolet coating anti-reflection lens on the light-emitting surface of the light-emitting diode 111, the first optical signal L1 emitted by the light-emitting diode 111 is focused by the first ultraviolet coating anti-reflection lens and then transmitted to the outside, thereby further increasing the communication distance of the day-blind deep ultraviolet wireless optical communication device based on the photomultiplier tube. By providing three light emitting diodes 111 in the emission structure 11, the intensity of the first optical signal L1 emitted by the emission structure 11 can be further enhanced, and the integrity of signal transmission can be further ensured while ensuring the communication transmission distance. In one example, the light emitting diode 111 is a quantum well light emitting diode.

[0052] In one example, the three light emitting diodes 111 are connected in series. In another example, the three light emitting diodes 111 are connected in parallel.

[0053] In some embodiments, the photomultiplier tube 121 is further used to convert the received second light signal L2 into a photocurrent signal; the receiving structure 12 further includes:

[0054] A transimpedance amplifier 123, electrically connected to the photomultiplier tube 121, for converting the photocurrent signal into a photovoltage signal;

[0055] A DC bias device 124, electrically connected to the transimpedance amplifier 123, for raising the photovoltage signal;

[0056] The signal determiner 125 is electrically connected to the DC bias device 124 , and is used to determine the raised photovoltage signal and output a second TTL signal to the main processing structure 10 .

[0057] In some embodiments, the receiving structure 12 further includes:

[0058] The second UV-coated anti-reflection lens 126 is located on a side of the deep UV filter 122 away from the photomultiplier tube 121 , and is used for focusing the optical signal entering the receiving structure 12 .

[0059] For example, since the photomultiplier tube 121 is highly sensitive to light, the deep ultraviolet filter 122 is provided at the front end of the photomultiplier tube 121 (i.e., on the side of the light incident surface of the photomultiplier tube 121) to filter out background light noise in other bands other than the deep ultraviolet band, so as to avoid affecting the reception of the second light signal L2 in the deep ultraviolet band by the photomultiplier tube 121, thereby realizing day-blind communication. The second ultraviolet coated anti-reflection lens 126 is provided on the side of the deep ultraviolet filter 122 away from the photomultiplier tube 121, so that the second light signal L2 is incident on the photomultiplier tube 121 after passing through the second ultraviolet coated anti-reflection lens 126 and the deep ultraviolet filter 122 in sequence, thereby further increasing the communication distance of the day-blind deep ultraviolet wireless optical communication device based on the photomultiplier tube. The photomultiplier tube 121 converts the received second light signal L2 into a photocurrent signal and sends it to the transimpedance amplifier 123. The transimpedance amplifier 123 converts the photocurrent signal into a photovoltage signal and sends it to the DC bias device (i.e., bias-tee) 124. The DC bias device 124 includes an AC circuit end and a DC circuit end electrically connected to each other. The AC circuit end receives the photovoltage signal output by the transimpedance amplifier 123, and applies an external voltage signal to the DC circuit end to raise the photovoltage signal, so that the raised photovoltage signal is subsequently input into the signal decision device 125 for decision comparison. The signal decision device 125 makes a decision on the raised photovoltage signal output by the DC bias device 124, and outputs the second TTL signal to the main processing structure 10 after the decision.

[0060] In some embodiments, the main processing structure 10 further includes:

[0061] A modulation circuit 104, electrically connected to the transceiver circuit 101, configured to modulate the first signal into a first TTL signal and then transmit the first signal to the transmitting structure 11;

[0062] The demodulation circuit 105 is electrically connected to the transceiver circuit 101 and is used to demodulate the second TTL signal output by the receiving structure 12 .

[0063] In some embodiments, the modulation circuit 104 is a FSK (Frequency-shift keying) modulation circuit, and the demodulation circuit 105 is a FSK demodulation circuit; the main processing structure also includes:

[0064] A FIFO (First Input First Output) data register is electrically connected to the transceiver circuit 101, the modulation circuit 104 and the demodulation circuit 105, and is used to store the first signal and the second signal.

[0065] For example, the main processing structure 10 uses a Xilinx FPGA (Field Programmable Gate Array) development board as the main processor, uses a UART (Universal Asynchronous Receiver / Transmitter) communication protocol, and uses a square wave with a duty cycle of 50% as a signal waveform. The main processing structure 10 includes the transceiver circuit 101, the FIFO data register, a data control circuit, the modulation circuit 104, and the demodulation circuit 105. In one example, the transceiver circuit 101 includes a receiving circuit 1011 and a transmitting circuit 1012, the FIFO data register includes a transmitting data register 102 and a receiving data register 107, and the data control circuit includes a transmitting data control circuit 103 and a receiving data control circuit 106, so that the day-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube can synchronously perform data transmission and data reception to achieve full-duplex communication. For example, when the photomultiplier tube-based day-blind deep ultraviolet wireless optical communication device transmits data, the PC as an external information source is electrically connected to the main processor through the UART to USB interface, and the first signal enters the transmission data register 102 through the receiving circuit 101 for temporary storage; the transmission data control circuit 103 controls the first signal to enter the modulation circuit 104 for modulation to form a first TTL (transistor-transistor logic, transistor-transistor logic level) signal and output it to the transmitting structure 11. When the photomultiplier tube-based day-blind deep ultraviolet wireless optical communication device receives data, the second TTL signal enters the demodulation circuit 105 of the main processing structure 10 through the TTL pin for demodulation processing, and after demodulation, the receiving data control circuit 106 controls the demodulated data (i.e., the second signal) to enter the receiving data register 107 for temporary storage, and the receiving data control circuit 106 controls the demodulated data to enter the sending circuit 1012 to transmit the data to another PC as an external information destination. Figure 5A schematic diagram is shown of a first photomultiplier tube-based solar-blind deep ultraviolet wireless optical communication device 51 and a second photomultiplier tube-based solar-blind deep ultraviolet wireless optical communication device 52 performing full-duplex communication, and the structure of the first photomultiplier tube-based solar-blind deep ultraviolet wireless optical communication device 51 is the same as the structure of the second photomultiplier tube-based solar-blind deep ultraviolet wireless optical communication device 52, see Figure 1-Figure 4 .

[0066] In some embodiments, the main processing structure 10 further includes an input interface and an output interface electrically connected to the transceiver circuit 101, the input interface being used to electrically connect to an external information source, and the output interface being used to electrically connect to an external information sink;

[0067] The input interface and the output interface are any one of an RS232 interface, an RS485 interface, an RS499 interface, an RS422 interface, a USB interface and an RJ45 interface.

[0068] Specifically, the UART communication protocol can be directly compatible with multiple communication interfaces such as RS232, RS485, RS499, RS422, or can be connected to interfaces such as USB and RJ45 through conversion. It can form a simple network with other communication devices and has significant application value, thereby further expanding the application field of the photomultiplier tube-based day-blind deep ultraviolet wireless optical communication device.

[0069] In order to further fully avoid interference from sunlight, in some embodiments, the wavelengths of the first optical signal L1 and the second optical signal L2 are both 275 nm.

[0070] Figure 6 is a schematic diagram of broadcast communication in a specific embodiment of the present invention. Since deep ultraviolet light has strong scattering properties, one-to-many broadcast communication can be achieved, thereby further expanding the application field of the solar-blind deep ultraviolet wireless optical communication device based on photomultiplier tubes. For example, Figure 6As shown, the transmitting structure 11 in the first photomultiplier tube-based day-blind deep ultraviolet wireless optical communication device 51 can simultaneously transmit the first optical signal L1 to the receiving structure 12 in the second photomultiplier tube-based day-blind deep ultraviolet wireless optical communication device 52, the receiving structure 12 in the third photomultiplier tube-based day-blind deep ultraviolet wireless optical communication device 53 and the receiving structure 12 in the fourth photomultiplier tube-based day-blind deep ultraviolet wireless optical communication device 54, and the structure of the first photomultiplier tube-based day-blind deep ultraviolet wireless optical communication device 51, the structure of the second photomultiplier tube-based day-blind deep ultraviolet wireless optical communication device 52, the structure of the third photomultiplier tube-based day-blind deep ultraviolet wireless optical communication device 53 and the structure of the fourth photomultiplier tube-based day-blind deep ultraviolet wireless optical communication device 54 are all the same, see Figure 1-Figure 4 .

[0071] The photomultiplier tube-based solar-blind deep ultraviolet wireless optical communication device provided in this specific embodiment is provided with at least one photomultiplier tube and a deep ultraviolet filter located on the light incident surface of the photomultiplier tube in a receiving structure, wherein the deep ultraviolet filter is used to filter out light signals other than deep ultraviolet light signals, and the photomultiplier tube is used to receive a second light signal passing through the deep ultraviolet filter, thereby utilizing the characteristics of deep ultraviolet light signals that are not interfered by sunlight, are invisible, and are resistant to electromagnetic interference, so that wireless optical communication technology can be applied to the field of solar-blind communication, and utilizing the high sensitivity and high gain of the photomultiplier tube so that deep ultraviolet wireless optical communication can achieve kilometer-level communication data transmission in a direct sunlight environment, thereby extending the wireless optical communication distance in a direct sunlight environment, and enabling the photomultiplier tube-based solar-blind deep ultraviolet wireless optical communication device to be used as an effective, safe, and real-time emergency supplementary communication means in special environments, thereby expanding the application field of wireless optical communication technology.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube, characterized in that: It includes a main processing structure, a transmitting structure and a receiving structure; wherein, The main processing structure includes a transceiver circuit, and the transceiver circuit is used to receive a first signal from an external source; The emission structure is electrically connected to the main processing structure, and includes a plurality of light emitting diodes, wherein the light emitting diodes are used to emit a first optical signal loaded with the first signal to the outside, and the light emitting diodes are deep ultraviolet light emitting diodes; The receiving structure is electrically connected to the main processing structure, and includes at least one photomultiplier tube and a deep ultraviolet filter located on the light incident surface of the photomultiplier tube, the deep ultraviolet filter is used to filter out light signals other than deep ultraviolet light signals, and the photomultiplier tube is used to receive a second light signal passing through the deep ultraviolet filter.

2. The solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube according to claim 1, characterized in that: The transmitting structure further comprises: A driver, configured to receive the first signal from the main processing structure; a transistor, wherein a gate electrode of the transistor is electrically connected to the driver, a drain electrode of the transistor is electrically connected to a cathode of the light-emitting diode, and the transistor is used to load the first signal to the light-emitting diode; A power supply is electrically connected to the light emitting diode and is used to supply power to the light emitting diode.

3. The solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube according to claim 2, characterized in that: The transmitting structure further comprises: The first ultraviolet-coated anti-reflection lens is located on the light-emitting surface of the light-emitting diode and is used for focusing the first optical signal.

4. The solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube according to claim 2, characterized in that: The emitting structure includes three light emitting diodes.

5. The solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube according to claim 1, characterized in that: The photomultiplier tube is also used to convert the received second light signal into a photocurrent signal; the receiving structure also includes: a transimpedance amplifier, electrically connected to the photomultiplier tube, and configured to convert the photocurrent signal into a photovoltage signal; A DC bias device, electrically connected to the transimpedance amplifier, for raising the photovoltage signal; A signal determiner is electrically connected to the DC bias device, and is used to determine the raised photovoltage signal and output a second TTL signal to the main processing structure.

6. The solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube according to claim 5, characterized in that: The receiving structure also includes: The second ultraviolet-coated anti-reflection lens is located on a side of the deep ultraviolet filter away from the photomultiplier tube and is used for focusing the optical signal entering the receiving structure.

7. The solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube according to claim 5, characterized in that: The main processing structure also includes: A modulation circuit, electrically connected to the transceiver circuit, configured to modulate the first signal into a first TTL signal and then transmit the first signal to the transmitting structure; A demodulation circuit is electrically connected to the transceiver circuit and is used to demodulate the second TTL signal output by the receiving structure.

8. The solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube according to claim 7, characterized in that: The modulation circuit is an FSK modulation circuit, and the demodulation circuit is an FSK demodulation circuit; The main processing structure also includes: A FIFO data register is electrically connected to the transceiver circuit, the modulation circuit and the demodulation circuit, and is used to store the first signal and the second signal.

9. The solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube according to claim 7, characterized in that: The main processing structure also includes an input interface and an output interface electrically connected to the transceiver circuit, the input interface is used to electrically connect to an external information source, and the output interface is used to electrically connect to an external information sink; The input interface and the output interface are any one of an RS232 interface, an RS485 interface, an RS499 interface, an RS422 interface, a USB interface and an RJ45 interface.

10. The solar-blind deep ultraviolet wireless optical communication device based on a photomultiplier tube according to claim 1, characterized in that: The wavelengths of the first optical signal and the second optical signal are both 275 nm.

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