Optical fiber transmission-based illumination system and method for lunar base

Abstract

The invention relates to the technical field of deep space exploration and test, in particular to an illumination system and method for a lunar base based on optical fiber transmission. Comprising a condenser, a light collimator, a light filter, a high-temperature-resistant optical fiber, a heat dissipation device and a light diffusion device, the condenser gathers sunlight and reflects the sunlight to the light collimator; the condenser comprises a sunlight automatic tracking device which controls the condenser to automatically track sunlight. Convergent light emitted by the condenser is converted into parallel light by the light collimator; the light filter filters the parallel light to obtain filtered light; the high-temperature-resistant optical fiber transmits the filtered light to the light scattering device; the heat dissipation device dissipates heat generated in the transmission process of the high-temperature-resistant optical fiber to the environment; the light diffusion device diffuses the received filtered light to a photosynthesis cabin of the lunar base; the illumination utilization rate of the biological regeneration life support system can be improved.

Description

Technical Field

[0001] The present invention relates to the field of deep space exploration and experimental technology, and in particular to a lighting system and method for a lunar base based on optical fiber transmission. Background Art

[0002] The lunar exploration project is one of the most challenging areas in the world's high-tech field. After achieving the goal of manned space station and unmanned lunar exploration, my country's next goal is manned spaceflight to the moon. The space agencies of the United States, Russia, Japan and Europe are actively preparing for the implementation of the lunar base project. The construction of a lunar base is an important means for mankind to achieve in-depth development and utilization of lunar resources.

[0003] To achieve the exploration goals of the lunar base, Mars base and even more distant outer space, we must rely on the Bioregenerative Life Support System (BLSS) technology. To this end, since the 1960s, aerospace experts from the United States and the Soviet Union have begun to explore BLSS. An important part of BLSS is to use green plants and photosynthetic algae to photosynthesize, absorb CO2, produce oxygen, reproduce food, treat waste, and regenerate air and water, providing an independent, complete and complex system to provide material support for the life activities of astronauts.

[0004] Due to the particularity of the lunar environment, the regenerative life support system can only be placed in a reliable closed environment. BLSS works in a closed cabin and cannot directly use external solar energy. If electrical energy is converted into light energy, the energy utilization rate is very low. Taking the solar power generation solution as an example, the conversion rate of solar cells from solar energy to electrical energy is about 20%, and the conversion rate from electrical energy to light energy is also about 20%. Optimistically estimated, this "light-electricity-light" solution has a utilization rate of only 4% for solar energy. Considering that the energy required for photosynthesis accounts for a large proportion of the BLSS and even the entire lunar base, this will cause a huge waste of energy, and thus increase the system weight and launch cost.

[0005] Therefore, developing an efficient and reliable lunar module light collection system has become an important task to promote the development of BLSS technology and has practical significance. Summary of the invention

[0006] In view of the above problems, the present invention provides a lighting system and method for a lunar base based on optical fiber transmission, which solves the technical problem of low lighting utilization rate of biological regeneration life support systems in the prior art.

[0007] On the one hand, the present invention provides a lighting system for a lunar base based on optical fiber transmission, comprising: a concentrator, a light collimator, an optical filter, a high temperature resistant optical fiber, a heat dissipation device, and a light diffusion device;

[0008] The concentrator collects sunlight and reflects it to the light collimator; the concentrator includes an automatic sunlight tracking device, and the automatic sunlight tracking device controls the concentrator to automatically track sunlight;

[0009] The light collimator converts the converged light emitted by the condenser into parallel light;

[0010] The optical filter filters the parallel light to obtain filtered light; the optical filter is a red light filter or a red and blue light filter;

[0011] The high temperature resistant optical fiber transmits the filtered light to the light scattering device;

[0012] The heat dissipation device dissipates the heat generated during the transmission of the high temperature resistant optical fiber into the environment;

[0013] The light diffusion device diffuses the received filtered light to the photosynthesis cabin of the lunar base.

[0014] Preferably, the concentrator is a parabolic reflector concentrator or a Fresnel lens concentrator;

[0015] The automatic sunlight tracking device controls the concentrator to automatically track sunlight based on the light sensing of the light sensitive element.

[0016] Preferably, the light collimator is a quartz convex lens or a multi-layer coated quartz convex lens, and the focus of the quartz convex lens is consistent with the light convergence point of the condenser.

[0017] Preferably, the filter is a multilayer dielectric film filter or an interference filter; the red light filter can only allow light with a wavelength of 640 to 680 nm to pass; the red and blue light filter can only allow light with a wavelength of 440 to 480 nm and light with a wavelength of 640 to 680 nm to pass.

[0018] Preferably, the high temperature resistant optical fiber is a coated quartz optical fiber with an operating temperature of -65°C to 300°C.

[0019] Preferably, the heat dissipation device is a heat pipe radiator, a liquid cooling radiator or a phase change material radiator.

[0020] Preferably, the light diffusion device is an optical fiber end diffuser or a microstructure light diffusion plate.

[0021] Preferably, the photosynthesis chamber is an algae photosynthesis chamber or a green plant photosynthesis chamber.

[0022] On the one hand, the present invention provides an illumination method for an illumination system of a lunar base based on optical fiber transmission, comprising the following steps:

[0023] Step S1, the concentrator collects sunlight and reflects it to the light collimator; the automatic sunlight tracking device of the concentrator senses the current sunlight direction, and adjusts the direction of the concentrator based on the sunlight direction to complete automatic tracking of sunlight;

[0024] Step S2, the light collimator converts the received focused light into parallel light;

[0025] Step S3, the parallel light passes through an optical filter to filter the light to obtain filtered light; when the optical filter is a red light filter, the filtered light includes light with a wavelength of 640 to 680 nm; when the optical filter is a red and blue light filter, the filtered light includes light with a wavelength of 440 to 480 nm and light with a wavelength of 640 to 680 nm;

[0026] Step S4: The filtered light is transmitted through the high temperature resistant optical fiber, emitted through the light scattering device, and irradiated into the photosynthesis chamber.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] (1) The present invention uses a filter device to introduce only the red light and blue light required for plant photosynthesis or only the red light required for algae photosynthesis into the cabin, thereby avoiding the ineffective transmission of other wavelengths of light. Compared with the traditional "light-electricity-light" conversion solution, the system significantly improves the utilization efficiency of solar energy, thereby reducing energy waste.

[0029] (2) The present invention prevents excessive light sources from entering the cabin by providing a filtering device, thereby reducing heat accumulation in the cabin, and also adopts a heat dissipation device to reduce the temperature load of the optical fiber transmission system and the pressure of the temperature control system in the cabin, thereby improving the reliability and durability of the system.

[0030] (3) The present invention optimizes the light distribution in the cabin through the effective design of light transmission and light diffusion devices, reduces the need for additional light source equipment, and thus saves space in the cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings are only for the purpose of illustrating particular embodiments and are not to be construed as limiting the invention.

[0032] Figure 1 Schematic diagram of the lighting system for the lunar base based on optical fiber transmission provided by the present invention.

[0033] Figure 2 This is a structural block diagram of the lighting system for the lunar base based on optical fiber transmission provided by the present invention.

[0034] Figure 3 A flow chart of the lighting method for a lunar base based on optical fiber transmission provided by the present invention. DETAILED DESCRIPTION

[0035] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. In addition, the present invention can also be implemented in other ways different from those described herein, and therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0036] In order to meet the photosynthesis requirements of plants in the lunar base cabin, it is necessary to introduce sufficient sunlight into the cabin, but too many light sources will cause excessive transmission load and excessive fiber temperature, affecting the reliability and durability of the optical transmission system. At the same time, too much sunlight will cause the temperature in the cabin to be too high, increasing the burden of temperature control. For this reason, considering that plants absorb solar energy mainly in the blue light (440-480nm) and red light (640-680nm) regions, algae absorb solar energy mainly in the red light region, and solar energy in these two bands accounts for about 10% of the total energy. For this reason, the present invention guides sunlight from outside the cabin into the plant growth cabin through an optical fiber transmission system, and at the sunlight input end, filters the sunlight according to different wavelengths, and only inputs red light and blue light into the cabin.

[0037] like Figure 1 As shown, a lighting system for a lunar base based on optical fiber transmission is disclosed, including: a concentrator, a light collimator, a filter, a high temperature resistant optical fiber, a heat dissipation device, and a light diffusion device. The workflow is as follows Figure 2 shown.

[0038] The concentrator can be a parabolic reflector concentrator or a Fresnel lens concentrator. The concentrator is provided with an automatic sunlight tracking device. The automatic sunlight tracking device senses the current direction of sunlight through a light sensitive element to achieve automatic tracking of sunlight to ensure that the light is always concentrated on the light collimator, thereby maximizing the utilization efficiency of light energy.

[0039] The light collimator is a lens device, which can be a quartz convex lens or a multi-layer coated quartz convex lens. The quartz lens has excellent light transmission performance and high temperature resistance, which can ensure that the light passes through and becomes parallel light, thereby improving the light transmission efficiency. The multi-layer coated lens can further reduce light loss and improve the collimation effect by coating thin films of different materials on the lens surface. By arranging the position of the light collimator and the concentrator, the focus of the quartz convex lens is consistent with the light convergence point of the concentrator, so as to ensure that the concentrated sunlight can be efficiently converted into parallel light.

[0040] The filter can be a red-blue light filter or a red light filter. When the algae are to be irradiated, since the algae absorbs solar energy mainly in the red light region, the filter can be a red light filter that can only allow light with a wavelength of 640 to 680 nm to pass; when the plants to be irradiated are green plants, the filter can be a red-blue light filter that can only allow light with a wavelength of 440 to 480 nm and light with a wavelength of 640 to 680 nm to pass.

[0041] In some embodiments, the optical filter may be a multilayer dielectric film filter or an interference filter. The multilayer dielectric film filter achieves selective transmission of light of a specific wavelength through a combination of different dielectric film layers, and can effectively filter out other spectral components other than red light and blue light. The interference filter uses the interference principle of light to achieve efficient transmission of red light (640-680nm) and blue light (440-480nm) through a precisely designed thin film structure. The filter should have high transmittance and high selectivity to ensure that the spectral components required for plant photosynthesis can be fully transmitted.

[0042] The high temperature resistant optical fiber can be a coated quartz optical fiber, which can work normally under temperature conditions of -65°C to +300°C and transmit the red and blue light output by the filter. The high temperature resistant optical fiber has high strength and high durability to ensure that it is not affected by temperature changes during long-term use.

[0043] The heat dissipation device is used to dissipate the heat generated during the optical fiber transmission process to the environment to avoid heat accumulation affecting the durability of the optical fiber. The heat dissipation device can be a heat pipe radiator, a liquid cooling radiator or a phase change material radiator. The heat pipe radiator uses the liquid vaporization and condensation cycle in the heat pipe to achieve efficient heat conduction and dissipation, and is suitable for use in limited spaces. The liquid cooling radiator removes the heat generated during the optical fiber transmission process through the circulation of the liquid cooling medium.

[0044] The light-scattering device can be a fiber end diffuser or a microstructure diffuser. The fiber end diffuser diffuses the transmitted light evenly into the cabin through the fiber end structure to ensure uniform light distribution. The microstructure diffuser utilizes the optical properties of the surface microstructure to achieve uniform scattering and distribution of light, and is suitable for use in scenes that require uniform illumination over a large area. The light-scattering device has an efficient light diffusion capability, which diffuses red and blue light into the cabin, ensuring that the plants in the cabin can obtain uniform lighting conditions.

[0045] In order to illustrate the effectiveness of the method proposed in the present invention, the above technical solution of the present invention is described in detail below through specific embodiments.

[0046] Embodiment 1

[0047] The lighting system for the lunar base based on optical fiber transmission of this embodiment includes: a Fresnel lens condenser, a quartz convex lens light collimator, a red light filter, a coated quartz high temperature resistant optical fiber, a phase change material heat sink, and a light diffusion device at the end of the optical fiber;

[0048] In this embodiment, the sunlight is first collected and reflected to the quartz convex lens collimator through a Fresnel lens concentrator with a fiber optic tracking function, so that the light becomes parallel light after passing through the lens. The parallel light passes through the red light filter, and based on the multi-layer dielectric film, other wavelengths of light are filtered, leaving only red light with a wavelength of 640 to 680 nm, and is injected into the coated quartz high-temperature resistant optical fiber. The light reaches the indoor end diffusion device through the optical fiber and is diffused into the algae photosynthesis cabin, thereby realizing the effective transmission of sunlight outside the cabin to the cabin.

[0049] Embodiment 2

[0050] The lighting system for the lunar base based on optical fiber transmission of this embodiment includes: a parabolic reflector concentrator, a multi-layer coated quartz convex lens light collimator, a red and blue light filter, a high temperature resistant optical fiber, a heat pipe radiator and a micro-structure diffuser device.

[0051] In this embodiment, the sunlight is first collected and reflected to the multi-layer coated quartz convex lens light collimator through a parabolic reflector concentrator with a fiber optic tracking function, so that the light becomes parallel light after passing through the lens. The parallel light passes through the red and blue light filter, and based on the interference filter, the light of other wavelengths is filtered, leaving only the red and blue light with a wavelength of 440-480nm and a wavelength of 640-680nm, and is injected into the coated quartz high-temperature resistant optical fiber. It reaches the indoor micro-structure diffuser device through the optical fiber and is diffused into the green plant photosynthesis cabin, thereby realizing the effective transmission of sunlight outside the cabin to the cabin.

[0052] Embodiment 3

[0053] This embodiment discloses an illumination method for an illumination system of a lunar base based on optical fiber transmission, which specifically includes the following steps:

[0054] Step S1, the concentrator collects sunlight and reflects it to the light collimator; the automatic sunlight tracking device of the concentrator senses the current sunlight direction, and adjusts the direction of the concentrator based on the sunlight direction to complete automatic tracking of sunlight;

[0055] Step S2, the light collimator converts the received focused light into parallel light;

[0056] Step S3, the parallel light passes through an optical filter to filter the light to obtain filtered light; when the optical filter is a red light filter, the filtered light includes light with a wavelength of 640 to 680 nm; when the optical filter is a red and blue light filter, the filtered light includes light with a wavelength of 440 to 480 nm and light with a wavelength of 640 to 680 nm;

[0057] Step S4: The filtered light is transmitted through the high temperature resistant optical fiber, emitted through the light scattering device, and irradiated into the photosynthesis chamber.

[0058] The above lunar module lighting system provided by the present invention can improve the utilization rate of sunlight, reduce the waste heat in the plant growth cabin, reduce the heat dissipation load in the cabin, and increase the usable space in the cabin.

[0059] Although the specific embodiments of the present invention have been described in a specific order, each action or step should be understood to require that such action or step be performed in the specific order shown or in a sequential order, or require that all illustrated actions or steps should be performed to obtain the desired result. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Certain features described in the context of a separate embodiment can also be implemented in a single implementation in combination. On the contrary, the various features described in the context of a single implementation can also be implemented in multiple implementations individually or in any suitable sub-combination.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A lighting system for a lunar base based on optical fiber transmission, characterized in that: include: Condensers, light collimators, filters, high temperature resistant optical fibers, heat sinks, and light diffusers; The concentrator concentrates the sunlight and reflects it to the light collimator; Condenser It includes a sunlight automatic tracking device, which controls the concentrator to automatically track sunlight; The light collimator converts the converged light emitted by the condenser into parallel light; The optical filter filters the parallel light to obtain filtered light; the optical filter is a red light filter or a red and blue light filter; The high temperature resistant optical fiber transmits the filtered light to the light scattering device; The heat dissipation device dissipates the heat generated during the transmission of the high temperature resistant optical fiber into the environment; The light-scattering device diffuses the received filtered light to the photosynthesis cabin of the lunar base.

2. The optical fiber transmission-based lighting system for a lunar base according to claim 1, characterized in that: The concentrator is a parabolic reflector concentrator or a Fresnel lens concentrator; The automatic sunlight tracking device controls the concentrator to automatically track sunlight based on the light sensing of the light sensitive element.

3. The optical fiber transmission-based lighting system for a lunar base according to claim 2, characterized in that: The light collimator is a quartz convex lens or a multi-layer coated quartz convex lens, and the focus of the quartz convex lens is consistent with the light convergence point of the condenser.

4. The optical fiber transmission-based lighting system for a lunar base according to claim 3 is characterized in that: The filter is a multilayer dielectric film filter or an interference filter; the red light filter can only allow light with a wavelength of 640 to 680 nm to pass; the red and blue light filter can only allow light with a wavelength of 440 to 480 nm and light with a wavelength of 640 to 680 nm to pass.

5. The optical fiber transmission-based lighting system for a lunar base according to claim 4 is characterized in that: The high temperature resistant optical fiber is a coated quartz optical fiber with an operating temperature of -65°C to 300°C.

6. The optical fiber transmission-based lighting system for a lunar base according to claim 5, characterized in that: The heat dissipation device is a heat pipe radiator, a liquid cooling radiator or a phase change material radiator.

7. The optical fiber transmission-based lighting system for a lunar base according to claim 6, characterized in that: The light diffusion device is an optical fiber end diffuser or a microstructure light diffusion plate.

8. The optical fiber transmission-based lighting system for a lunar base according to claim 7, characterized in that: The photosynthesis chamber is an algae photosynthesis chamber or a green plant photosynthesis chamber.

9. The illumination method for an illumination system for a lunar base based on optical fiber transmission according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step S1, the concentrator collects sunlight and reflects it to the light collimator; the automatic sunlight tracking device of the concentrator senses the current sunlight direction, adjusts the direction of the concentrator based on the sunlight direction, and completes automatic tracking of sunlight; Step S2, adjusting the focus of the light collimator to be consistent with the light convergence point of the condenser, so that the light collimator converts the received focused light into parallel light; Step S3, the parallel light passes through a red light filter or a red-blue light filter to filter the light to obtain filtered light; the red light filter filters to obtain light with a wavelength of 640 to 680 nm; the red-blue light filter filters to obtain light with a wavelength of 440 to 480 nm and light with a wavelength of 640 to 680 nm; Step S4: The filtered light is transmitted through the high temperature resistant optical fiber, emitted through the light scattering device, and irradiated into the photosynthesis chamber.

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