218 results about "Light laser" patented technology

The invention provides a simultaneous multiband superheterodyne receiver based on Rydberg atoms, and relates to the technical field of microwave electric field measurement, probe light provided by a probe light laser and coupling light provided by a coupling light laser oppositely enter an alkali metal atom gas chamber; the microwave signal sources of the multiple wave bands generate two paths of signals, one path of microwave signal is emitted to the space through the local oscillator microwave electric field emission horns of the wave bands, and the microwave electric field receiving horns of the wave bands receive corresponding echo signals. After frequency mixing of each wave band, the microwave electric field emission horn irradiates the alkali metal atom gas chamber at the same time, microwave fields of multiple wave bands are sequentially coupled with multiple pairs of continuous adjacent Rydberg states, and superheterodyne receiving is carried out on microwaves of multiple wave bands at the same time; and superheterodyne and high-sensitivity detection of microwave signals of multiple wave bands can be realized.

The invention relates to a temperature field and deformation field synchronous measurement system and method based on laser speckle DIC and temperature field algorithm temperature measurement. The system comprises a 3CCD color camera, a lens, a three-band filter, a monochromatic light source, a mechanical support adjusting platform, a triangular support and a computer. A test piece is actively illuminated by blue laser, and a color image containing three channel sub-images of red, green and blue on the surface of a high-temperature sample before and after deformation is acquired by a 3CCD color camera. A temperature field algorithm is used for analyzing sub-images of the R channel and the G channel after deformation to calculate a temperature field of the surface of the test piece, and a digital image correlation method is used for analyzing sub-images of the B channel before and after deformation to obtain a strain field of the surface of the test piece, so that synchronous measurement of the temperature field and the deformation field of the surface of the test piece is realized. The principle is simple, the system structure is compact, temperature field measurement is not interfered by speckles, and non-contact, high-precision and synchronous measurement of a material deformation field and a temperature field under the action of force and thermal loads can be achieved.

The invention discloses a Rydberg atom microwave measurement sensitivity improving method based on atom velocity selection, and relates to the field of Rydberg atom microwave measurement, and the method comprises the steps: moving the frequency of probe light to an energy level resonance transition position of cesium atoms from a ground state to an excited state, scanning the frequency of the coupled light within a Rydberg state energy level preset range, and observing an EIT signal; the frequency of the detection light is changed, the detuning amount of the detection light is selected to enable the EIT signal to reach the maximum, and the frequency of the detection light is locked to the frequency corresponding to the maximum position of the EIT signal; meanwhile, a local oscillation field signal generator in the Rydberg atomic microwave sensitivity measurement device is turned on, and corresponding EIT-AT splitting is generated; the frequency of the coupling light is locked to the coupling light laser frequency corresponding to the lowest point of EIT-AT splitting, and the Rydberg atom microwave measurement sensitivity reaches the maximum. The cesium atom speed is screened and controlled, and the signal-to-noise ratio of the measurement signal is improved, so that the measurement sensitivity is improved.

The disclosure relates to a micro gunsight, a small laser, a fine-tuning spring, a laser sight device inner core, a reset pin and a laser sight device. which includes a mounting slot that is matched with the gun card track. The mounting slot is composed of a fixed rail and a movable rail. The mounting slot is provided with a gunsight body, and inside the gunsight body is provided with a laser fine-tuning seat. A dual-light laser is installed inside the laser fine-tuning seat, and a fine-tuning mechanism is installed in the laser fine-tuning seat. There are multiple adapters at the bottom of the gunsight body, which are suitable for different Picatinny rails, making the installation position closer to the trigger guard, convenient for users to operate, and avoiding the problem of easy loosening of the front and rear positions of the sight device.

The invention provides a debugging method for a fast optical fiber delay line, which comprises the following steps of: searching a driving shaft of a translation platform of a positioning motor as a main optical axis, converting the main optical axis by using a theodolite and a visible light laser, then adjusting two optical fiber collimating mirrors to enable the optical axes of the two optical fiber collimating mirrors to be parallel to the main optical axis, and adjusting the positions of two movable pyramid reflectors to realize debugging of the fast optical fiber delay line. It is ensured that the visible laser thin beam can sequentially pass through the reflectors and finally be emitted out of the other optical fiber collimating mirror. And finally, the optical fiber collimating mirror is finely adjusted to maximize the coupling efficiency average value of the optical fiber delay line and minimize the change rate of the optical fiber delay line, so that the coupling efficiency change of the optical fiber delay line is effectively controlled in the moving process of the translation stage, and the measurement precision of the terahertz time-domain spectrometer and the optical frequency comb is ensured.

The invention discloses a power system partial discharge ultra-wideband detection device based on an MEMS atomic gas chamber, and the device comprises a detection laser used for emitting detection light, a coupling light laser used for emitting coupling light, and an MEMS atomic gas chamber used for transmitting the detection light and the coupling light to the MEMS atomic gas chamber, the modulation transmission module is used for controlling the MEMS atomic gas chamber to move in discharge equipment by utilizing a four-axis transmission system, acquiring an electric signal acquired by a photoelectric detector arranged at one end of the MEMS atomic gas chamber, converting the electric signal into a spectral signal, and transmitting the spectral signal to the MEMS atomic gas chamber. And the data processing module is used for receiving the spectrum signal, analyzing the spectrum signal and determining a discharge position according to an analysis result. According to the invention, the micro atomic gas chamber manufactured by using the MEMS technology is combined with the specific wavelength laser excitation and detection technology, so that the accurate detection and analysis of ultrahigh frequency and ultra wide band electromagnetic signals generated by partial discharge are realized.

The invention discloses an automobile motor magnetic steel inserting machine based on visual recognition, and belongs to the field of automobile motor machining, the automobile motor magnetic steel inserting machine comprises a base, a display screen, a reflection component and a filter element assembly, a shell is arranged over the base, one side of the shell is connected with the display screen in a penetrating mode, one side of the base is provided with a feeding mechanism, and the other side of the base is provided with a magnetic steel inserting mechanism. The feeding mechanism adjusts and controls the displacement distance of a workpiece according to the machining requirement, and then magnetic insertion operation of automobile motors with different diameters is met. And a piezomagnetic mechanism is arranged in the shell, the piezomagnetic mechanism adjusts the pressing height according to the pressing requirement, so that the magnetic steel is tightly attached to the stator iron core, and the piezomagnetic mechanism ensures that the magnet has no displacement. The industrial camera and the blue light laser are inclined and adjusted through the arc-shaped rack and the gear, the arc-shaped rack adopts helical tooth design, precision gear transmission is combined, inclination angle adjusting precision is achieved, and the requirement of the blue light laser for projection angle deviation is met.

The invention provides a Fe3O4 nano-particle microscopic imaging detection method based on left-handed and right-handed polarization modulation, belongs to the technical field of photo-thermal science and detection and signal processing, and solves the problems that at present, nano single particles are difficult to observe, and the physicochemical characteristics are difficult to obtain, the method specifically comprises the steps that a to-be-detected sample is determined, and a slide sample is prepared; starting a computer, a data acquisition card, a lock-in amplifier, a galvanometer controller and a function generator; starting an exciting light and probe light laser power supply and a refrigerator; detection parameters, laser power / current parameters and modulation parameters are set, and scanning detection is conducted on the detection sample piece; loading a magnetic field; the computer reads a signal from the data acquisition card to obtain a photo-thermal detection result image; different laser parameters and magnetic field sizes are changed, the steps are repeated, circular dichroism and magnetic circular dichroism detection results are obtained, magnetization curve measurement is carried out, and the single nanoparticle magnetic moment overturning process is monitored.

The invention discloses a square groove size measuring device and method based on linear structured light and arc-shaped reflector imaging, the device comprises a base, the base is provided with a bent metal plate base, the base is provided with an arc-shaped reflector mechanism and a rotating platform mechanism, the arc-shaped reflector mechanism comprises a partition plate, a linear laser generator, an arc-shaped reflector and a CMOS camera, the CMOS camera and the linear laser generator are arranged on the partition plate. By introducing an arc-shaped reflecting mirror mechanism and designing the curvature and the mounting angle of the arc-shaped reflecting mirror mechanism, a vertical groove wall in a line structured light laser shadow area is effectively reflected to a camera imaging visual field, so that the imaging range of the vertical groove wall is expanded, and the detectability of local shape change caused by surface micro roughness is enhanced; the technical problems that an effective reflection path is difficult to form when laser irradiates a vertical or nearly vertical groove wall in the horizontal direction, local shape change information caused by surface microcosmic roughness cannot be obtained, and a complete square groove outline cannot be obtained at a time are solved.

The invention belongs to the technical field of laser cladding processing, and provides a method for preparing an ablation-resistant copper alloy through a blue laser cladding process and the ablation-resistant copper alloy. The method comprises the following steps that alloy powder is subjected to ball milling, and mixed powder is obtained; the alloy powder is CuCr powder, CuW powder, ODS-Cu powder, SiO2 / Cu powder or C / Cu powder; and the mixed powder is used for preparing a cladding layer on a copper base material by adopting a blue laser cladding process. According to the method, the characteristic that a copper material is high in blue laser absorptivity is utilized, the problems of heat input accumulation, air holes, inclusions and the like under the conditions of low absorptivity and high energy density are avoided, and laser process parameters are controlled to form a molten pool on the surface of a copper base material; and the coaxial powder feeding device gathers the powder material into the molten pool for melting and rapid cooling and solidification by utilizing protective gas to form a cladding layer with excellent performance, so that the surface of the copper base material is modified, and the performance of the copper base material is improved.

The present invention provides a semiconductor laser-based soft tissue surgery system, which comprises a light source, an optical fiber output assembly, an electronic control assembly, a power assembly, and a cooling and temperature control assembly. The light source comprises a first laser device assembly, a second laser device assembly, a laser shaping assembly, and a first optical fiber coupler; the first laser device assembly is configured to emit visible light laser or emit visible light laser and near-infrared laser at the same time, and the second laser device assembly is configured to generate low-power visible light laser with the power not greater than 5 mW. The laser emitted by the first laser device assembly and the second laser device assembly is collimated and combined by means of the laser shaping assembly, coupled to the optical fiber output assembly by means of the first optical fiber coupler, and then transmitted to a target position.

The utility model discloses a positioning device for guardrail installation, which relates to the technical field of guardrail installation and comprises a positioning component and an auxiliary component. The positioning assembly comprises a first supporting table, a second supporting table, a mounting column, a supporting box, a winding roller, a positioning wide rope and a supporting cover, the supporting box is arranged on one side of the top end of the first supporting table, the winding roller is rotationally connected into the supporting box, the positioning wide rope is arranged on the surface of the winding roller, and the supporting cover is arranged at the top end of the supporting box. A mounting column is arranged on one side of the top end of the second supporting table. The guardrail installation positioning device has the advantages that the placing error of the second supporting table can be reduced through cooperation of the infrared laser lamp and the positioning block, the positioning wide rope is straightened under the action of the winding roller, and the guardrail to be installed is attached to the surface of the positioning wide rope, so that a good positioning effect is achieved on installation of a plurality of guardrails, and the installation accuracy of the guardrails is improved. The specific mounting position of each guardrail can be quickly and accurately determined, and the mounting operation is more convenient.

The invention provides an offshore photovoltaic ship expelling system, method and device, a medium and electronic equipment, and relates to the technical field of offshore safety. The ship expelling system comprises a plurality of pieces of ship expelling equipment, wherein each piece of ship expelling equipment comprises a loudspeaker and a laser lamp; a plurality of support columns, wherein one end of each support column is used for fixing the ship expelling equipment; the processing equipment is used for determining the coordinate position of the to-be-expelled ship and the expelling level of the to-be-expelled ship, determining target ship expelling equipment from the multiple pieces of ship expelling equipment according to the coordinate position of the to-be-expelled ship, and determining a target working mode of the target ship expelling equipment according to the expelling level of the to-be-expelled ship, and sending a working instruction to the target ship expelling equipment, wherein the working instruction is used for indicating the target ship expelling equipment to work in the target working mode. According to the invention, automatic expelling of the abnormal ship in the offshore photovoltaic scene can be realized.

A visible light laser system and operation for welding materials together. A blue laser system that forms essentially perfect welds for copper based materials. A blue laser system and operation for welding conductive elements, and in particular thin conductive elements, together for use in energy storage devices, such as battery packs.

The invention relates to the technical field of methane telemetering, and particularly provides a methane telemetering system which comprises a DFB laser, a visible light laser, a dichroic mirror, a reflector, a Cassegrain telescope system, a sensor and a data acquisition card, infrared band light and visible light are combined through the dichroic mirror, the combined light is emitted to measured gas through the reflector, and the measured gas is transmitted to the sensor through the Cassegrain telescope system. The combined light passes through the detected gas and then irradiates on a reflecting surface, part of echo reflected light passes through the detected gas again and then enters the Cassegrain telescope system, and after being converged by the Cassegrain telescope system, the sensor acquires an optical signal and converts the optical signal into an analog electric signal; and the analog electric signal is converted into a digital electric signal through the data acquisition card. Visible light is used for assisting in observing the scanning position of infrared band light, the defect that human eyes cannot directly observe the detection position in the methane laser telemetering process is overcome, the light receiving caliber is increased, and the detection signal quality is improved.

The invention relates to a silicon nitride waveguide and gallium nitride visible light source coupling structure based on a metasurface, and belongs to the technical field of optoelectronic integration. The structure comprises a silicon substrate, a silicon dioxide cladding, a silicon nitride waveguide layer / metasurface structure, a BCB bonding layer, a P-type gallium nitride layer, a gallium nitride multi-quantum well layer, an N-type gallium nitride layer and a P / N-type electrode from bottom to top. The size of the silicon nitride waveguide is designed to be matched with the visible light single-mode transmission condition and the gallium nitride light-emitting wavelength range, the periodic metasurface structure is etched and prepared on the silicon nitride waveguide layer to regulate and control the amplitude, phase and polarization of the gallium nitride visible light, and high-efficiency coupling of the visible light and the silicon nitride waveguide is achieved. And meanwhile, integration of two different material systems is realized through the BCB bonding layer. The design can effectively realize the integration of the visible light source of the silicon nitride photonic integrated chip, solves the problems that the coupling loss of the silicon nitride waveguide and the visible light laser is large, the alignment precision requirement is high and the like, and provides a light source implementation scheme for chip-level biomedical detection and spectral analysis.

The present invention discloses a wire winding machine, which includes a sheet metal frame, an X-axis transverse mechanism, a Y-axis vertical mechanism, and a wire winding gun fixing component. A sheet fixing bracket is arranged on one side inside the sheet metal frame, and a sheet to be wire wound is fitted on the outside of the sheet fixing bracket. An X-axis transverse mechanism is arranged on one side outside the sheet metal frame, a Y-axis vertical mechanism is arranged on one side of the outer wall of the X-axis transverse mechanism, and a wire winding gun fixing component is arranged on one side of the outer wall of the Y-axis vertical mechanism. In this wire winding machine, the wire winding gun fixing component uses the wire winding gun as the working piece. A wire winding gun rod is arranged at the front end thereof, and the whole acts vertically on the sheet to be wire wound to insert into the sheet notch for reciprocating winding operation. When the wire winding gun moves in the Z-axis, the front and rear limit switches at the upper end will be automatically activated to control the reciprocating movement amount in the Z-axis, and the wire winding position is aligned by the parallel laser lights on the outside to ensure the accuracy and stability during automatic wire winding.

The semi-automatic feeding device of the light laser pipe cutting machine comprises a feeding module in butt joint with one side of a machine tool, the feeding module comprises a plurality of feeding arms and a reference arm, the feeding arms are arranged in parallel and perpendicular to the direction of the machine tool, and the reference arm is perpendicularly arranged on the rear side of a cutting chuck of the machine tool. The plurality of feeding arms are sequentially distributed between the reference arm and a tail end chuck of the machine tool at intervals; conveying chains which run circularly are carried on the feeding arms, a plurality of limiting blocks which are distributed at equal intervals and used for limiting pipes are carried on the conveying chains, the conveying chains on the multiple feeding arms run synchronously, and the positions of the limiting blocks carried on the conveying chains are the same, so that when the multiple conveying chains run synchronously, the limiting blocks are separated from the limiting blocks. Every two adjacent limiting blocks which are located on the upper surfaces of the multiple feeding arms and located at the same position jointly convey one pipe in a limiting mode. The feeding storage amount is large, orderly feeding can be achieved, and the feeding failure rate is low; and the feeding period of the pipe is shortened, and the machining efficiency is improved.

The invention provides single-point temperature measurement equipment and a temperature measurement system, and belongs to the technical field of infrared temperature measurement. The single-point temperature measurement device comprises a single-point infrared temperature measurement module, a line laser module fixing support and a line laser module, the line laser module fixing support is connected to the single-point infrared temperature measurement module, and the line laser module is connected to the temperature measurement line laser module fixing support. A single-point infrared temperature measurement module body of the single-point infrared temperature measurement module penetrates through the temperature measurement line laser module fixing bracket and the line laser module; at least two groups of line laser lamps are arranged on one side, penetrating through the single-point infrared temperature measurement module body, of the line laser module, laser emitted by the two groups of line laser lamps intersects to form a light beam, and the light beam is in the axial center direction of the single-point infrared temperature measurement module body. And the single-point temperature measuring equipment realizes accurate positioning of temperature measuring points.

The utility model discloses a solar bird repelling device which comprises an installation box, a fixing plate is fixedly connected to the bottom of the installation box, a fixing structure is arranged on the side wall of the fixing plate, a control module is arranged in the installation box, a storage battery is arranged in the control module, laser lamps are embedded in the two side walls of the installation box, and the laser lamps are connected with the storage battery. One end of each laser lamp penetrates through the side wall of the mounting box, a buzzer is arranged in the mounting box, a plurality of sound transmission holes are formed in the periphery of the mounting box, a vertical rod is fixedly connected to the top of the mounting box, a rotating structure is arranged on the side wall of the outer ring of the vertical rod, and a solar panel is fixedly connected to the top of the vertical rod. Through mutual cooperation of the mounting box, the fixing plate, the U-shaped plate, the extrusion plate and other components, through inclined arrangement of the solar panel and arrangement of the rolling shaft, birds can be prevented from falling on the top of the solar panel, bird repelling in various modes can be achieved through wind power, the bird repelling effect of the device is improved, and practicability is high.

The invention discloses a photo-thermal modulation differential microscopic imaging method based on double excitation light excitation, and relates to a photo-thermal modulation differential microscopic imaging method. The invention aims to solve the problem that the existing photo-thermal microscopic imaging technology is limited by the diffraction limit and cannot break through the minimum resolution limit. The method comprises the following steps: step 1, determining a sample piece to be detected, and placing the sample piece in a photo-thermal modulation differential microscopic imaging system; step 2, starting a photo-thermal modulation differential microscopic imaging system; 3, starting an exciting light laser power supply, a probe light laser power supply and a refrigerator; step 4, setting detection parameters in photo-thermal modulation differential microscopic imaging system software in the computer; 5, gold nanoparticles are selected as imaging objects, and multiple times of detection are carried out; step 6, adopting a multi-arm carbon nanotube as a sample, and carrying out multiple times of detection; and 7, closing the equipment after the experiment is finished for 5 minutes. The invention belongs to the technical field of photo-thermal science and detection signal processing.

The utility model provides a laser housing and a semiconductor spatial light laser, comprising a front panel and a rear panel which are oppositely and vertically arranged, and two side plates used for connecting the front panel and the rear panel, a first area enclosed by the front panel, the rear panel and the two side plates is used for placing the semiconductor spatial light laser, and a second area enclosed by the two side plates is used for placing the semiconductor spatial light laser. Detachably connected cover plates are arranged at the upper end and the lower end of the first area; and a fixing assembly for mounting the laser housing on the semiconductor device, the fixing assembly being disposed on any one or more of the front panel, the rear panel, and the two side plates. According to the utility model, the independent fixing assembly is arranged, and a proper laser fixing position is selected according to the internal structures of different semiconductor devices, so that the semiconductor devices are convenient to assemble and replace; the water cooling assembly is fixed through the front panel and the rear panel of the laser shell, and then the upper and lower layers of light source modules are installed, so that the double-layer semiconductor light source modules have supporting areas in the assembling process, and optical fibers are prevented from being bent.

The invention relates to the technical field of space photoelectric detection, in particular to a digital weak light phase-locked control system and method based on phase readout, and the system comprises a laser interference and photoelectric conversion structure, a phase tracking readout module and a weak light phase-locked control module which are connected with one another. The laser interference and photoelectric conversion structure is used for generating a laser heterodyne interference signal based on the local laser and the weak laser, converting the laser heterodyne interference signal into an electric signal and inputting the electric signal to the phase tracking reading module; the phase tracking read-out module is used for tracking the phase of the laser heterodyne interference signal through the electric signal, calculating phase error information and inputting the phase error information to the weak light phase-locked control module; and the weak light phase lock control module is used for controlling the frequency of the local laser based on the phase error information and locking the local laser to the phase of the weak light laser. According to the invention, rapid, high-precision and long-time automatic phase locking under the extremely weak light condition is realized.

The invention discloses a tunable white laser system, which belongs to the technical field of laser, and comprises a light source emitting device, the light source emitting device is coupled with a laser beam combining device, the light source emitting device comprises a first light source, a second light source and a third light source, the first light source is a cyan laser source or a green laser source, and the second light source is a third light source. The second light source is a red light laser source, the third light source is a cyan light laser source or a green light laser source, the third light source and the first light source are different in color, and the laser beam combining device comprises a beam splitter assembly and an optical fiber beam combining assembly. According to the tunable white light laser system, the light source with the wave band above blue light is adopted to generate white light laser, complex devices such as a super-continuum spectrum generation device and a white light extraction device are not needed, the system has the advantages of being adjustable in real-time chromaticity and easy to integrate, blue light pollution to the external environment in the white light generation process is avoided, and the system is suitable for large-scale popularization and application. The method has stronger condition adaptability and practicability, and the stability of mixed light is good.

The present application relates to the technical field of wood processing, and discloses a high-precision cutting process for woodworking machinery based on laser positioning, comprising the following steps: S1, scanning the surface of wood by a laser sensor to obtain wood data, S2, combining visible light laser and infrared laser, S3, analyzing the characteristics of wood by using an AI algorithm, S4, dynamic compensation of laser error, S5, multi-process collaborative cutting, S6, cooling and heat prevention technology, S7, intelligent environment regulation: real-time monitoring of factory environment parameters to automatically adjust the working state of the laser cutting system, S8, adaptive laser focal length adjustment, S9, adopting an automatic feedback mechanism to record errors in each cutting process in real time. By adopting dual-spectrum laser fusion ranging technology, combining visible light and infrared laser, precise ranging of different wood materials and surface conditions is realized, and the ranging effect is more adaptive and less error, thereby improving the cutting positioning precision.

The invention relates to the technical field of fruit tree planting, and discloses a fruit space attitude angle measuring device, which comprises a base, two adjacent sides of the outer wall of the base are respectively and movably provided with a transverse base and a vertical base, and the outer walls of the transverse base and the vertical base are respectively provided with a graduated scale; the scale pointers are rotationally arranged in the middle of the transverse base and the middle of the vertical base respectively, a wiring harness laser lamp and an integrated power source are installed at the end of each scale pointer, and the wiring harness laser lamps are used for marking the positions of the stem and the calyx of the apple on the top face of the base; and the bull eye gradienter is used for adjusting the levelness of the base. The light beam generated by the wire beam laser lamp is aligned with the stem and the calyx of the apple, and the reading of the graduated scale and the pointer is combined to ensure that the measurement result of the attitude angle has high precision and reliability, so that the measurement error is reduced, and high-precision verification data can be provided for a subsequent automatic visual algorithm; the problem that the measurement result is not real and unstable in the prior art is effectively solved.

Examples of a laser additive manufacturing system are described. The system comprises a laser configured to generate a laser beam, a fiber optic coupled to the laser to transmit the laser beam to a laser optic head that is coupled to the fiber optic and comprises a focus lens to focus the light beam. The laser optic head is configured to slide along a sliding mechanism in X-direction. A powder feeder is used to continuously move in Y-direction and dispense an uniform layer of powdered material onto a powder bad that is positioned on a build plate of the building chamber. The build plate is configured to move in Z-direction. The light beam generated by the laser is focused using the laser optic head onto a small region of the powder bed where the powdered material is positioned producing small volumes of melt pools that are then cooled and a new layer of powdered material is dispensed over it.

The utility model discloses a drainage tube fixing device capable of measuring the lifting angle of a bedside, which belongs to the field of medical instruments and comprises a protractor and a ruler strip, the back of the protractor is fixedly connected with a bed board fixing component, the front of the protractor is provided with a sliding groove, and the protractor is movably connected with the ruler strip through a movable shaft. The bottom end of the ruler strip is fixedly connected with the protractor through a locking bolt, and the top end of the ruler strip is fixedly connected with a gradienter; according to the drainage tube fixing device capable of measuring the lifting angle of the bed head, by arranging the protractor, the sliding groove, the ruler strip, the movable shaft, the locking bolt, the gradienter, the movable sleeve, the fixator and the laser lamp, measurement of the lifting angle of the bed head and measurement of the hanging height of the drainage tube can be integrated in the hanging process of the drainage tube; medical staff can conveniently, quickly and accurately find the fixed height of the drainage tube and the lifting angle of the bed head, so that convenience is brought to the work of the medical staff.

The invention relates to the technical field of laser radars, in particular to a vortex light laser radar which comprises a laser emitting unit, an optical receiving unit, an optical modulation unit, a signal detection unit, a signal acquisition and processing unit and a system structure unit. The optical receiving and modulating module divides echo light into a vortex channel and a reference channel through polarization beam splitting. The vortex channel performs orbital angular momentum modulation on echo light by using the receiving modulation unit, converts coherent signal light into annularly distributed vortex light, and filters incoherent noise light through the OAM spatial filtering assembly, thereby realizing spatial separation of signals and noise. The problem of interference of multiple scattered light and background light in a strong scattering medium is effectively solved, the detection signal-to-noise ratio, the maximum detection distance and the target resolution of the laser radar are remarkably improved, and the system is compact in structure, high in engineering practicability and particularly suitable for target detection in underwater, haze and other complex environments.

The present invention discloses a method for generating sound waves in the air using a pulsed laser. The device for generating sound waves is composed of a pulsed laser and an optical modulation system. The pulsed laser is emitted by a pulsed laser and then acts on water vapor in the air after passing through the optical modulation system. The water vapor absorbs the heat energy of the pulsed laser. After the pulsed laser passes through, the water vapor temperature instantly rises and expands, thereby generating pressure waves in the area of ​​action, that is, generating sound waves through the photoacoustic effect. In addition, a three-color visible light laser is used to illuminate the area of ​​action for imaging. The structure of the method for generating sound waves in the air using laser pulses proposed by the present invention is simple. Since water vapor can still be generated even in air with low relative humidity, the effect can be achieved by only following the above steps. The method has research value in the manipulation of microparticles, biological imaging, space imaging, sound communication, and naked-eye three-dimensional display.