42 results about "Green laser light" patented technology

The invention discloses a liquid-phase protein chip method for simultaneously detecting three kinds of porcine coronaviruses and a kit thereof, which comprises the following steps of: after activating and coupling microspheres, respectively coating antigen on porcine delta coronavirus N protein, porcine acute diarrhea syndrome coronavirus N protein and porcine epidemic diarrhea virus N protein by using the microspheres; matching the two fluorescent dyes according to different concentrations to form fluorescent coding microsphere combination arrays with different energy levels; the microspheres are analyzed one by one based on the flow principle, red laser recognizes microsphere codes, green laser reads fluorescence intensity of report molecules, computer analysis and processing are carried out, and fluorescence signals are converted into quantitative detection results; and determining the optimization of the detection conditions of the liquid-phase protein chip after the liquid-phase protein chip test. The antigens coated on the microspheres only specifically react with corresponding antibodies and are not combined with antibodies generated by other pathogens; the PDCoV, SADS-CoV and PEDV antibodies in the sample to be detected can be rapidly, effectively and accurately detected, and reference is provided for prevention of the porcine coronavirus.

The invention discloses a green laser assembly, an optical module and application of the green laser assembly in photovoltaic assembly processing, a shell is provided with a first fixed reflector coated with a reflecting film for reflecting 1064nm, a first acousto-optic Q switch and a second acousto-optic Q switch are orthogonally arranged, an Nd: YAG laser uses an Nd: YAG crystal rod with the diameter of 6mm and the length of 166mm, and a second fixed reflector coated with a reflecting film for reflecting 1064nm is arranged on the Nd: YAG crystal rod. The first dichroscope transmits 1064nm and reflects 532nm to improve the conversion efficiency of frequency multiplication, the LBO crystal 16 is placed close to the second dichroscope to improve the power density and the conversion efficiency, and the second dichroscope reflects 1064nm and transmits 532nm. And the light with the wavelength of 532nm transmitted by the second dichroscope is coupled into an input end optical fiber of the optical fiber beam splitter after passing through the optical isolator and the first lens. The short-wavelength green laser is adopted, the photovoltaic welding strip is mainly composed of the copper base material and the tin alloy, the green laser absorptivity is far larger than the near-infrared wavelength (about 1 micron) absorptivity, and the laser absorptivity of the welding strip is remarkably improved.

The invention provides an illumination system and projection equipment. The lighting system comprises a light source module, a wavelength conversion device, a first light guide assembly, a second light guide assembly and a micro-lens array module. The light source module is used for providing a plurality of green and blue laser beams. The wavelength conversion device is used for generating fluorescent light beams. The first light guiding assembly and the second light guiding assembly are used for guiding a fluorescent light beam and a green laser light beam respectively. The fluorescent light beams form fluorescent light spots on the first area of the first side face of the micro-lens array module. The plurality of green laser beams form a plurality of green light spots on a second area of the first side surface of the micro-lens array module. The first region is adjacent to the second region. The illumination system and the projection equipment provided by the invention avoid energy loss and have good light uniformity.

Disclosed are a projection screen, a manufacturing method therefor, and a projection system. The projection screen includes a diffusion layer, Fresnel structure layer with a plurality of Fresnel structures that are sequentially arranged, on a side of the diffusion layer, and a wavelength selection based reflection layer, covering at least part of a surface of the Fresnel structure of the Fresnel structure layer. A reflectivity for projection light emitted from a projection device by the wavelength selection based reflection layer is higher than a reflectivity for light of other wavelength bands by the wavelength selection based reflection layer. The projection light includes red laser light, green laser light, and blue laser light.

The invention discloses a control method for determining a cleaning strategy of a mobile robot and related equipment. The method comprises the following steps: when a green laser lamp emits green laser to a target area, acquiring a colored laser image formed by irradiation of the green laser in the target area through a camera; processing the colored laser image based on a preset detection model to obtain object detection information of the target area, the object detection information including an object category and an object position; and under the condition that the object category is liquid and / or dust, the mobile robot is controlled to go to the object position to mop the floor. According to the method, the smudginess detection accuracy of the mobile robot is improved, and the mobile robot can clean the indoor space more cleanly and more intelligently.

The utility model relates to the technical field of bird repelling equipment, in particular to a laser bird repelling lamp hung on an unmanned aerial vehicle. Comprising a shell, a loudspeaker installed on the shell and laser emission heads installed at the two ends of the shell, and an installation part is fixed outside the shell; the laser emission head can emit a green laser beam with the wavelength of 532 nm, a polaroid used for diverging a laser beam into a plurality of laser beams and emitting the laser beams outwards in a conical shape is arranged in the laser emission head, the installation part comprises a double-torsion spring fixed to the outer wall of the shell, two small supporting legs are arranged on the inner side of the double-torsion spring, and the two small supporting legs are arranged on the outer wall of the shell. The outer side of the double torsion spring is provided with two small supporting legs, the ends of the two small supporting legs are connected to form a small frame shaped like a Chinese character'ji ', the outer side of the double torsion spring is provided with two large supporting legs, the ends of the two large supporting legs are connected to form a large frame shaped like a Chinese character'ji', and the small frame can penetrate through a gap of the large frame to be installed in a surrounding mode; the bird repelling device is exquisite in design, high in bird repelling error-tolerant rate and convenient to install, and has wide market prospects.

The invention discloses a fluorescence immunodetection analyzer and a detection analysis method thereof. The analyzer comprises a sheath flow pool which is vertically arranged, red and green laser excitation light sources which are horizontally arranged on the two sides of the sheath flow pool in the X-axis direction, and double independent light paths which are arranged on the two sides of the sheath flow pool in the Y-axis direction. A red laser light path separates fluorescence into three paths of signals of 730nm, 670nm and residual fluorescence through a series-connected dichotomy mirror group; the green laser light path collects diffuse reflection light. The four paths of optical signals are converted into voltage signals by four detectors, temperature compensation units integrated in the detectors correct the signals in real time based on a pre-calibrated dark current-temperature relation curve, and temperature drift is suppressed. And the signal processing system calls a pre-established signal model library to carry out comprehensive calibration and synchronous analysis on multi-channel signals, so that accurate distinguishing and counting of different fluorescent microspheres are realized. According to the invention, the problems of large temperature influence and low detection efficiency in the prior art are solved, and the stability, accuracy and multi-channel consistency of detection are remarkably improved.

The application discloses a laser, a laser light source and a laser projection device, and belongs to the projection display field.The laser comprises a substrate and a plurality of laser units arranged in an array on the substrate.In the application, the laser comprises two rows of laser units, one row of red light laser units for emitting red laser, and the other row of green light laser units for emitting green laser and blue light laser units for emitting blue laser.Under the premise of ensuring the brightness of the laser beam emitted by the laser, the number of laser units in the laser is reduced.Thus, the overall volume of the laser can be effectively reduced, and the volume of the laser projection device integrated with the laser is small.

The invention provides an industrial augmented reality intelligent projection detection system and method based on multi-view blue-green double-color laser, and belongs to the technical field of laser projection. The system comprises a binocular camera, a galvanometer, a green laser and a blue laser. The galvanometer comprises an X mirror and a Y mirror. According to the invention, the blue laser and the green laser are fused, and closed-loop operation of laser projection indication and intelligent inspection and detection is realized.

The invention relates to the technical field of laser, and discloses a high-power yellow-green laser generation method, which comprises the following steps: generating pump light through a first seed source, and generating signal light through a second seed source; after the pump light and the signal light are mixed through the first wavelength division multiplexer, the pump light and the signal light are combined with the light of the first pump source in the beam combiner, and then are subjected to power amplification through the first ytterbium-doped optical fiber to obtain high-power laser; after collimation by the collimator and color separation by the first dichroic mirror, frequency doubling is carried out by the frequency doubling crystal, and finally, high-power yellow-green laser is output by color separation by the second dichroic mirror. The invention discloses an optical fiber laser for generating high-power yellow-green laser, which reduces the number of core devices in an optical path structure, simplifies the optical path structure and control logic, reduces the hardware cost and assembly debugging cost of equipment, and improves the production efficiency. The stimulated Brillouin threshold value of the laser is effectively improved, broadening in the spectrum amplification process is restrained, and meanwhile the stable and good time-domain characteristic can be kept.

The utility model discloses a laser blazing warning lamp, which belongs to the technical field of traffic warning, and comprises a base, two first support plates are arranged in the base, a mounting seat is arranged on the two first support plates, a plurality of laser lamps are arranged on the mounting seat, a support column is further arranged in the base, and a circuit board is arranged on the top surface of the support column. The laser lamp is electrically connected with the circuit board, the circuit board is electrically connected with the power supply mechanism, and a switch is arranged on the left side of the circuit board. The warning lamp can be placed in the automobile when not in use and can be directly adsorbed on the automobile body when in use, so that the time for placing a triangular warning board is saved, and secondary accidents are avoided; the red laser lamp and the green laser lamp flicker alternately to arouse alertness of other vehicles, the irradiation distance of the laser lamps can reach 1000 meters, flickering of the laser lamps can be seen even in foggy weather, and the warning effect is obvious.

The present invention provides a phosphor wheel, light source device, and projector that can improve light utilization efficiency and reduce laser speckle. [Solution] A phosphor wheel 23 having phosphor regions 23r and 23g that convert the wavelength of blue laser light, and which rotates in response to the drive of a rotation mechanism, comprising a red phosphor region 23r that converts blue laser light to red laser light, a green phosphor region 23g that converts blue laser light to green laser light, and a transparent region 23b that transmits blue laser light, the transparent region 23b transmitting blue laser light through a microlens array.

The present application discloses a laser projection device, comprising: a blue laser, a red laser, a green laser, a laser driving circuit corresponding to each color laser, a light modulation device, a display panel and a signal shaping circuit; the display panel is configured to generate a modulation driving signal for driving the light modulation device and generate a driving signal for driving each color laser to emit light, the driving signal including an initial image enable signal and an initial current control signal; the signal shaping circuit is connected to the display panel and is disposed in the path where both or any one of the initial image enable signal and the initial current control signal is transmitted to at least one color laser, and is configured to output a shaping signal; the shaping signal is superimposed on the above two signals or any one of them to form a target driving signal; the laser driving circuit is configured to receive the target driving signal and directly drive the corresponding color laser to emit light or go out, and the target driving signal is a high-frequency periodic driving signal. When the above laser projection device performs projection display, the speckle phenomenon can be weakened or suppressed.

The present invention proposes a quasi-continuous green laser light-emitting device and a method for using the same. The seed laser optical path includes a laser, which emits a seed laser; the seed laser is divided into a first laser and a second laser after passing through a polarization beam splitter; the second laser propagates at a ninety-degree angle to the first laser; the first optical path includes a first frequency-doubling crystal and a first dichroic mirror; the first laser forms a first frequency-doubling laser after passing through the first frequency-doubling crystal, and the first frequency-doubling laser is divided into a first useless laser and a first monochromatic laser after passing through the first dichroic mirror; the first monochromatic laser enters a polarization beam combiner; the second optical path includes a second frequency-doubling crystal, a second dichroic mirror, and a third dichroic mirror; the second laser forms a second frequency-doubling laser after passing through the second frequency-doubling crystal, and the second frequency-doubling laser is divided into a second useless laser and a second monochromatic laser after passing through the second dichroic mirror; the polarization beam combiner emits a synthesized laser. This technical solution uses a relatively low-priced red laser to obtain green laser light.

A projection light source (100) and a projection apparatus. The projection light source (100) comprises a three-color laser light source (101); a red LED light source (102); a blue laser light source (103); a phosphor plate (104) arranged on a light-emitting side of the blue laser light source (103) and used for converting blue laser light into green fluorescence; and a compound-eye module (105) arranged on light-emitting sides of the three-color laser light source (101), the red LED light source (102) and the phosphor plate (104), the compound-eye module (105) being used for homogenizing red laser light, blue laser light, green laser light, red light and green fluorescence and then transmitting same.

The present application discloses a liquid recognition method and related device based on the fusion of visual and olfactory information. The method includes: collecting a liquid image of the liquid to be recognized when irradiated by blue-green laser light; obtaining the olfactory information of the liquid to be recognized; extracting visual features from the liquid image of the liquid to be recognized through an image recognition model, and performing recognition based on the visual features to obtain a first recognition result of the liquid to be recognized; extracting odor features from the olfactory information of the liquid to be recognized through an odor recognition model, and performing recognition based on the odor features to obtain a second recognition result of the liquid to be recognized; fusing the first recognition result and the second recognition result of the liquid to be recognized to obtain a final recognition result of the liquid to be recognized, which improves the technical problem in the prior art that relies on visual information for recognition. Since liquids with similar colors have few visual features and single visual information is used for recognition, the physical and chemical properties of the liquid cannot be comprehensively reflected, resulting in a low recognition rate.

This invention relates to the field of power equipment protection technology, specifically to a comprehensive intelligent laser bird deterrent device and method based on AI vision. The device includes an image acquisition module for acquiring environmental images and transmitting them to an AI vision analysis module. This AI vision analysis module, based on a lightweight target detection model and multi-target tracking algorithm, identifies, tracks, and predicts the flight trajectories of birds in the images, generating analytical data including location, speed, number, and behavior type. A laser emission module projects green laser dots at the target birds based on the analytical data. A high-intensity light module emits strong light towards the target birds when the laser emission module's deterrent efficiency is insufficient. This bird deterrent device achieves eco-friendly bird deterrence by integrating artificial intelligence visual recognition, a multimodal bird deterrent execution unit, and an adaptive collaborative control strategy. It eliminates physical harm to birds, establishes an active identification and response mechanism, improves the long-term effectiveness of bird deterrence, reduces reliance on manual labor, and lowers operation and maintenance costs.

The application discloses a portable ultramicro evidence searching and finding device, which comprises a main body, a display screen arranged on the top surface of the main body and a lens connected to the bottom surface of the main body, an excitation light source and a light guide cover are arranged at the front part of the lens, the excitation light source comprises an LED light source, a green laser light source and a blue laser light source, the green laser and the blue laser emitted by the green laser light source and the blue laser light source are irradiated on the center position of the mouth of the light guide cover and are located on the middle line position of the lens; the lens comprises a CCD lens assembly and a microscope lens arranged at the rear part of the CCD lens assembly, a narrow wave filter is arranged at the front part of the microscope lens; the portable ultramicro evidence searching and finding device integrates the LED light source and the laser light source, when the LED light source is used, the evidence trace is searched in a large area, after the evidence trace is found, the evidence trace is excited by the laser, so that the evidence trace is displayed and is easy to be observed and extracted.

To suppress decrease in light flux value of display light when performing derating of a laser diode as a light source in a projector.SOLUTION: A projector has a light source part 62, a light source drive part 50, and a display control device 42 including a control part 44. The control part performs normal control mode for adjusting each light output so as to satisfy white balance when a temperature of a red laser diode can be suppressed to an allowable temperature or less, and when the temperature cannot be suppressed to the allowable temperature or less, performs derating for the red laser diode, and increases drive current value of green and blue laser diodes or a green laser diode and increases light output so as to suppress decrease in light flux value of display light due to decrease in light output of the red laser diode, thereby performing light flux maintenance control mode that prioritizes maintenance of the light flux value of the display light over maintenance of white balance.SELECTED DRAWING: Figure 2

The invention discloses a laser projection device and a wearable device. The laser projection device comprises a laser display assembly; a light combining assembly; the laser display assembly comprises three groups of microcavity laser arrays, each group of microcavity laser array comprises a plurality of laser units, and the laser units in the three groups of microcavity laser arrays have a corresponding relation. The three groups of microcavity laser arrays are respectively used for generating a green laser image, a blue laser image and a red laser image; the light combining assembly is used for combining laser beams emitted by the laser units with corresponding relations to one pixel point, so that the green laser image, the blue laser image and the red laser image are combined into a target laser image; the controller is electrically connected with the laser display assembly, and the controller is used for receiving the driving signal and controlling the display parameter of each laser unit according to the driving signal; and the lens is arranged on the light emitting path of the light combining assembly, receives the target laser image emitted by the light combining assembly and emits a projection image.

Method for manufacturing a bipolar plate (2), comprising the following steps: - Provision of two steel half-sheets (3, 4), wherein at least one of the two half-sheets (3, 4) has an embossed structure (5), - Construction of a three-dimensional metal structure (7) from a first powder (12) of a metal different from the steel of the half-sheets (3, 4) or from at least two powders (12) of different metals, wherein at least one first powder of the at least two powders (12) is selected to be different from the steel of the half-sheets (3, 4), wherein the metal is selected from the group comprising titanium, titanium alloys, nickel, nickel alloys, chromium, chromium alloys, ferrochrome alloys, copper, copper alloys, gold, gold alloys, platinum, platinum alloys, silver, silver alloys, iridium, iridium alloys, rhodium, rhodium alloys, ruthenium, ruthenium alloys, palladium, palladium alloys, on a first half-sheet (3) of the two half-sheets (3, 4) by means of a laser (10) with green laser light and consequently a wavelength in the range of 495 nm to 550 nm, wherein the first Powder made from the metal copper is used.wherein, when using at least one further different second powder, a further laser in the form of an infrared laser is used to build up the three-dimensional metal structure (7), and , - Forming a materially bonded connection of the 3D metal structure (7) with a second half-sheet (4) of the two half-sheets (3, 4) using the same laser (10) with green laser light, wherein the half-sheets (3, 4) are joined to form a bipolar plate (2).

The utility model discloses a lane indicator with laser display projection, which comprises a shell, a front traffic signal lamp panel and a rear traffic signal lamp panel, the front traffic signal lamp panel and the rear traffic signal lamp panel are respectively arranged on two sides of the shell, and the shell is provided with a power supply, a control card, a red laser projection lamp and a green laser projection lamp. The power supply, the front traffic signal lamp panel, the rear traffic signal lamp panel, the red laser projection lamp and the green laser projection lamp are all electrically connected with the control card; the projection end of the red laser projection lamp and the projection end of the green laser projection lamp are arranged downwards so that projection can be projected to a lane below the shell. The light source of the red laser projection lamp is a red laser diode, and the light source of the green laser projection lamp is a green laser diode. The monochromatic laser diode is used as a light source of the projection lamp, the light source utilization rate is improved, the size of a heat dissipation structure of the laser projection lamp is reduced, the projection lamp can be integrated in the lane indicator, the size of the indicator is reduced, and power consumption is reduced.

The present invention discloses a projection device and a projection system, comprising: at least one laser light source, including a plurality of red laser chips, a plurality of green laser chips, and a plurality of blue laser chips, wherein the number of green laser chips and the number of blue laser chips are both less than the number of red laser chips; at least one waveguide plate, wherein one waveguide plate is located on the light-emitting side of each green laser chip; the waveguide plate comprises a light input portion and a light output portion, wherein the light input portion is used to guide the incident laser into the waveguide plate, and the light output portion is used to output the conducted laser; and the width of the laser beam emitted by the light output portion is equal to the width of the laser beam emitted by the red laser chip, so that the spot size of the blue and green lasers in the emitted light is the same as the spot size of the red laser, thereby making the optical etendue of the blue and green lasers the same as the optical etendue of the red laser, and the three colors of laser light are evenly distributed after light combination.

This invention relates to the field of laser technology and discloses a method for generating high-power yellow-green laser. The method involves generating pump light from a first seed source and signal light from a second seed source. The pump light and signal light are mixed by a first wavelength division multiplexer, then combined with the light from the first pump source in a beam combiner. The combined beam is then amplified by a first ytterbium-doped fiber to obtain high-power laser light. After collimation by a collimator and dichroism by a first dichroic mirror, the laser light is frequency-doubled by a frequency-doubling crystal and finally dichroically separated by a second dichroic mirror to output high-power yellow-green laser light. This invention discloses a fiber laser for generating high-power yellow-green laser light, which reduces the number of core components in the optical path structure, simplifies the optical path structure and control logic, and reduces the hardware cost and assembly / debugging cost of the equipment. It effectively improves the stimulated Brillouin threshold of the laser and suppresses broadening during spectral amplification, while maintaining stable and good temporal characteristics.

This utility model discloses a laser, comprising: a laser source for emitting a fundamental frequency beam; an optical fiber splitter for splitting the fundamental frequency beam into at least two fundamental frequency sub-beams for output, wherein the at least two fundamental frequency sub-beams are emitted in parallel; multiple frequency doubling units located on the propagation paths of each fundamental frequency sub-beam for receiving the fundamental frequency sub-beams and outputting frequency-doubled sub-beams; at least one reflection unit located on the propagation paths of some of the frequency-doubled sub-beams for reflecting the frequency-doubled sub-beams and outputting reflected frequency-doubled sub-beams, wherein the polarization directions of the reflected frequency-doubled sub-beams and the frequency-doubled sub-beams are perpendicular; and at least one polarization combining unit located on the propagation paths of the frequency-doubled sub-beams and the reflected frequency-doubled sub-beams for combining the frequency-doubled sub-beams and the reflected frequency-doubled sub-beams and outputting a green laser beam. By setting multiple frequency-doubled sub-beams and reflected frequency-doubled sub-beams and using the polarization combining unit for polarization combining, a high-brightness green laser beam is output.

The present invention discloses a combined laser light source, which relates to the field of optical technology. The present invention specifically includes a housing, a three-primary-color laser and an aperture mirror. The three-primary-color laser and the aperture mirror are respectively fixed in the housing. The three-primary-color laser is used to generate a red laser beam, a green laser beam and a blue laser beam. The light-emitting ends of the red laser, the green laser and the blue laser are respectively provided with aperture mirrors. The reflection of the aperture mirrors makes the laser beams overlap. The overlap of the laser beams is used to form beams of different colors. The housing is provided with a light outlet, and the light beams reflected by the aperture mirror are transmitted from the light outlet. The present invention uses three-primary-color lasers to form three laser beams, and these three laser beams can form laser beams of other colors, which can meet the requirements of stage lights for various color beams. In addition, the scattering angle of the laser beam is small and not easy to diverge, and a clear and distinct light spot can be formed in the far field, which can be applied to venues of various sizes.

The invention relates to a color-mixing laser module device (72a-d), in particular for use in smart glasses (10a-d), comprising a layer structure (22a-d) which is designed at least for an at least partly spatially separated internal guiding of at least one first laser signal (12a-d) having a first light color and at least one second laser signal (14a-d) having a second light color which substantially differs from the first light color, preferably a red laser signal (16a-d), a green laser signal (18a-d), and a blue laser signal (20a-d), said layer structure having a first layer (24a-d) with a respective spatially separated coupling region (26a-d, 28a-d, 30a-d) for the first laser signal (12a-d) and for the second laser signal (14a-d), preferably for the red laser signal (16a-d), for the green laser signal (18a-d), and for the blue laser signal (20a-d), and a second layer (32a-d) with at least one common color-mixing decoupling region (34a-d) for the first laser signal (12a-d) and the second laser signal (14a-d), preferably the red laser signal (16a-d), the green laser signal (18a-d), and the blue laser signal (20a-d).

The application discloses a light source device and a projection system, which comprise a laser light source array, a dichroic mirror, a dynamic optical component, a fluorescent conversion component and a heat dissipation component. The fluorescent conversion component adopts a fixed fluorescent conversion component, which can greatly improve the system reliability, has no mechanical movement and can reduce the structure design size of the light source device. The fluorescent material is changed from the original annular area to a small square or circular area, which greatly reduces the use amount of the fluorescent material and reduces the material cost. In addition, the fixed fluorescent conversion component can be centrally cooled without the dynamic limitation of high-speed rotation. In the three primary colors emitted by the light source device, the red light is mixed light of red fluorescent light and red laser light, and the green light is mixed light of green fluorescent light and green laser light. Since the laser has a large color gamut, the color performance of the projection system can be improved.

The invention discloses a green optical fiber laser and a tunable green laser acquisition method. The green optical fiber laser comprises a blue pumping source, a dichroic mirror, a coupling aspheric lens, a gain optical fiber and a matching optical fiber which are sequentially arranged along a main optical axis, a plane blazed grating is arranged on one side of the dichroscope, and the plane blazed grating is obliquely arranged in a Littrow structure; the ends of the gain optical fiber and the matching optical fiber are connected through a ceramic bushing, and an optical fiber end face coated mirror is arranged at the joint; a laser resonant cavity is formed between the optical fiber end face coated mirror and the blazed grating; laser emitted by the blue light pumping source is sequentially transmitted through the dichroscope and focused to the gain optical fiber through the coupling aspherical lens, green light is formed under the ground state absorption effect, gain amplification is conducted, then the green light enters the laser resonant cavity, green light laser reversely propagating along the main optical axis is generated, and after passing through the coupling aspherical lens, the green light laser is reflected by the dichroscope to the plane blazed grating to be tuned; and green laser is output through zero-order diffraction. The laser is high in efficiency and power, and system complexity and cost are reduced.

Provided is an optical displacement sensor in which a housing serving as a head is reduced in size. A relay cable extending from the head is integrated with the body. The head part is mainly responsible for projecting light to and receiving light from an object to be detected, and the body is composed of a power supply circuit, a display part and an operation part. The head comprises a green laser light source and emits green laser to form light spots on the surface of an object to be detected.