Abstract: A filtering device for killing pathogenic microorganisms using deep ultraviolet laser is provided, including a main body and a deep ultraviolet laser module, the main body is configured for accommodating gas having pathogenic microorganisms; the deep ultraviolet laser module is connected to the main body and configured for totally reflecting the deep ultraviolet laser for multiple times to form a dense and regular deep ultraviolet laser net, such that the gas is filtered in the dense and regular deep ultraviolet laser net to achieve the killing of the pathogenic microorganisms in the gas. The deep ultraviolet laser module includes a deep ultraviolet laser apparatus and a reflection adjusting assembly, the deep ultraviolet laser apparatus is connected to the main body, and the reflection adjusting assembly is configured for adjusting the density of the deep ultraviolet laser net.

Abstract: Disclosed are a metasurface-based structured light 3D imaging system and method, which use a metasurface-based control device to realize high-quality control of a laser beam, use a MEMS micromirror to scan and project the laser beam, and realize high-precision reconstruction of 3D information of the surface of an object together with related structured light design and demodulation methods. The invention realizes fine control of a structured light, improves the quality of a structured light field, reduces laser speckles and improves power, thus improving 3D imaging precision and robustness.

Abstract: Disclosed are a metasurface-based structured light 3D imaging system and method, which use a metasurface-based control device to realize high-quality control of a laser beam, use a MEMS micromirror to scan and project the laser beam, and realize high-precision reconstruction of 3D information of the surface of an object together with related structured light design and demodulation methods. The invention realizes fine control of a structured light, improves the quality of a structured light field, reduces laser speckles and improves power, thus improving 3D imaging precision and robustness.

Abstract: A filtering device for killing pathogenic microorganisms using deep ultraviolet laser is provided, including a main body and a deep ultraviolet laser module, the main body is configured for accommodating gas having pathogenic microorganisms; the deep ultraviolet laser module is connected to the main body and configured for totally reflecting the deep ultraviolet laser for multiple times to form a dense and regular deep ultraviolet laser net, such that the gas is filtered in the dense and regular deep ultraviolet laser net to achieve the killing of the pathogenic microorganisms in the gas. The deep ultraviolet laser module includes a deep ultraviolet laser apparatus and a reflection adjusting assembly, the deep ultraviolet laser apparatus is connected to the main body, and the reflection adjusting assembly is configured for adjusting the density of the deep ultraviolet laser net.

Abstract: The present invention discloses an optical path/beam splitting unit and a coaxial-wire-feed cladding head thereof. The optical path/beam splitting unit includes an adjustable mirror and at least one stage of beam splitter. Several adjustable mirrors are distributed around the beam splitter. The beam splitter splits an incident laser beam into a plurality of split beams perpendicular to the incident laser beam. The split beams all are focused to a point through the adjustable mirrors. The coaxial-wire-feed cladding head includes a cladding head mirror cavity provided therein with the optical path/beam splitting unit and a wire feeding tube. The wire feeding tube is coaxially arranged with the collimated laser beam. The wire feeding tube extends out of the cladding head mirror cavity. A wire passes through the wire feeding tube and the wire feeding nozzle in order. The adjustable mirrors adjust the focusing of the split beams onto the wire.

Abstract: The present invention discloses a method for lowering an oil pipe in a gas well without well-killing, a soluble bridge plug and a material preparation method thereof, wherein, the method comprises the steps of: lowering a bridge plug in a wellbore such that the bridge plug blocks the wellbore at a predetermined location in the wellbore; injecting water in the wellbore after the pressure in the wellbore has been relieved so as to replace gases in the wellbore; and lowering an oil pipe in the wellbore to the location of the bridge plug. The method for lowering an oil pipe in a gas well without well-killing, the soluble bridge plug and the material preparation method thereof provided in the present invention successfully solve the problem of high cost for lowering an oil pipe under pressure after a fracturing fluid has been injected into the casing.

Abstract: The present disclosure provides a disinfecting device for a central air conditioner, which uses high-powered ultraviolet rays to efficiently and rapidly eliminate viruses, and uses two sets of parallel reflectors to reflect and overlap light curtains of the high-powered ultraviolet rays back and forth. In this way, small-sized aerosols with viruses can be eliminated, and no secondary pollutants such as ozone are produced in a process of purifying and disinfecting air by the ultraviolet rays. The entire device has a simple structure and can be used in the central air conditioner with an existing architecture. The entire device only needs to be provided in an air supply duct of the central air conditioner.

Abstract: The present disclosure provides a disinfecting device for a central air conditioner, which uses high-powered ultraviolet rays to efficiently and rapidly eliminate viruses, and uses two sets of parallel reflectors to reflect and overlap light curtains of the high-powered ultraviolet rays back and forth. In this way, small-sized aerosols with viruses can be eliminated, and no secondary pollutants such as ozone are produced in a process of purifying and disinfecting air by the ultraviolet rays. The entire device has a simple structure and can be used in the central air conditioner with an existing architecture. The entire device only needs to be provided in an air supply duct of the central air conditioner.

Abstract: Disclosed is a laser head capable of dynamically regulating a laser spot by high frequency/ultrahigh frequency micro-vibration, including a laser transmitting device, a cavity, a special electromechanical module and a shielded nozzle. The laser transmitting device is disposed at the top of the cavity. A first protective glass and a collimating lens are sequentially disposed from top to bottom within the cavity. The special electromechanical module is disposed at the bottom of the cavity and connected to the cavity by means of a housing. A focusing lens is further disposed within the housing of the special electromechanical module, and a flat spring is disposed between the focusing lens and the special electromechanical module. The special electromechanical module can cause ultrahigh frequency micro-oscillation of the focusing lens. The shielded nozzle is disposed at the bottom of the special electromechanical module.

Abstract: The present invention discloses an optical path/beam splitting unit and a coaxial-wire-feed cladding head thereof. The optical path/beam splitting unit includes an adjustable mirror and at least one stage of beam splitter. Several adjustable mirrors are distributed around the beam splitter. The beam splitter splits an incident laser beam into a plurality of split beams perpendicular to the incident laser beam. The split beams all are focused to a point through the adjustable mirrors. The coaxial-wire-feed cladding head includes a cladding head mirror cavity provided therein with the optical path/beam splitting unit and a wire feeding tube. The wire feeding tube is coaxially arranged with the collimated laser beam. The wire feeding tube extends out of the cladding head mirror cavity. A wire passes through the wire feeding tube and the wire feeding nozzle in order. The adjustable mirrors adjust the focusing of the split beams onto the wire.

Abstract: A refrigerator light-sensing system capable of saving energy and reducing noise comprising a refrigerator, a lower door hinge cover arranged at the lower end of the refrigerator, and a light-sensing device installed in the lower door hinge cover. The light-sensing device is electrically connected to the refrigerator through a wireless transmission or a wire connection mode. The light-sensing device is internally provided with a light-sensing element, a power supply module, a controller, a refrigerator refrigeration system and a light intensity storage module. The light-sensing element is configured to convert a detected light signal into an electrical signal and transmit the electrical signal to the controller. The controller may then determine a target temperature according to the intensity of the converted electrical signal. Through the refrigerator light-sensing system, the power consumption of the refrigerator can be reduced, and the noise can be reduced, providing a better user experience.

Abstract: The present invention discloses a method for lowering an oil pipe in a gas well without well-killing, a soluble bridge plug and a material preparation method thereof, wherein, the method comprises the steps of: lowering a bridge plug in a wellbore such that the bridge plug blocks the wellbore at a predetermined location in the wellbore; injecting water in the wellbore after the pressure in the wellbore has been relieved so as to replace gases in the wellbore; and lowering an oil pipe in the wellbore to the location of the bridge plug. The method for lowering an oil pipe in a gas well without well-killing, the soluble bridge plug and the material preparation method thereof provided in the present invention successfully solve the problem of high cost for lowering an oil pipe under pressure after a fracturing fluid has been injected into the casing.