44 results about "Laser breakdown" patented technology

The invention discloses a method for promoting sensitivity of metal pollutants in water in laser breakdown spectrum detection. According to the method, a thin to-be-measured liquid film is formed on the surface of a solid carrier by a to-be-measured liquid sample in an atomized form, so as to convert the measurement for the to-be-measured liquid sample into the analysis for the solid carrier, thereby realizing the measurement for metal elements in the water. According to the method provided by the invention, the complex sample preparation is unnecessary, the stability of laser plasma measurement is promoted, the influence of water drop sputtering is eliminated, the emission life of a laser plasma is prolonged, the emission power of a laser plasma spectral line is promoted, the limit of detection of the analyzed elements is greatly promoted, and the influence of residues of the analyzed liquid sample is avoided. The method provided by the invention is suitable for various analyses of the elements in the liquid sample, in which a laser induced breakdown spectrum process is taken as an analysis means.

The invention discloses a device and method for high-locality micro electrodeposition of piezoelectric ceramics by adopting laser shocking, and relates to the field of laser manufacturing. The devicecomprises a workpiece processing system, a laser irradiation system, a working liquid circulation system and a control system. The method comprises the following steps: an electrodeposition solution is subjected to laser breakdown to generate plasma bubbles, the plasma bubbles impact on the surface of the piezoelectric ceramics, electric charges are gathered at the part where the piezoelectric ceramics deforms, and the piezoelectric effect of the piezoelectric ceramics is utilized to realize the high-locality micro electrodeposition. According to the device and method for high-locality micro electrodeposition of the piezoelectric ceramics by adopting laser shocking, the energy density at the laser focus is high, the solution is subjected to laser breakdown to generate plasma bubbles, the plasma bubbles generated by laser shocking impact on the piezoelectric ceramics to enable the piezoelectric ceramics to produce elastic deformation to cause polarization, negative electric charges aregathered on the surface of the piezoelectric ceramics after deformation, and negative charges are gathered in the deformation area and the electric potential becomes lower, metal cations in the solution are adsorbed and reduced, so as to realize the high-locality micro electrodeposition. The device and method are mainly used for manufacturing of micro-nano parts.

The water body metal pollution laser optical spectral penetration uses short pulse laser accumulation to generate high temperature ion on the water surface, excited atom, icon and molecule emitting lines of generated element component feature, through plasma spectrochemistry of the water sample to make strength analysis of the particular element line to decide the element content. The laser coupled to the emitting optical fiber through coupling lens, which receives the laser plasma signal, which is transmitted to optical spectrometer for light splitting, making photoelectric signal conversion by the CCD detector, coming into data collection and settlement system for treatment. It can be used for timely monitoring of poisonous metals.

The invention discloses a microstructure laser-induce implantation method based on a turbid liquid target. The method comprises the steps that a base material is placed in turbid liquid, containing fine particles, in glassware; laser light is focused on the position, wherein fine particles need to be implanted, of the base material through a convex lens after passing through a reflector; when focused laser energy is higher than the breakdown threshold value of liquid, laser breaks down the turbid liquid to cause plasma expansion and plasma shock waves radiate out; shock waves can radiate out when cavitation bubbles generated through induction after plasma disappears burst; high-speed microjet is generated through interaction between the cavitation bubbles and the surface of the base material; the generated shock waves and high-speed microjet push the fine particles to be implanted into the base material under impact. According to the method, laser energy does not directly act on the implanted target and can not damage the target, and the turbid liquid in any depth containing the fine particles is adopted to replenish the implanted target continuously, so that continuous microstructure preparation efficiency is improved. The invention further discloses a device using the method.

The invention discloses a compact laser induced breakdown spectroscopy measurement system. A control module controls a laser light source according to a preset work instruction to emit a laser beam to a focusing acquisition device; the focusing acquisition device focuses and irradiates the laser beam onto a sample to be tested, and the focusing acquisition device collects and sends the plasma light generated by the sample to be tested to a spectrum acquisition module; and the control module of analyzes the spectral data received by the spectrum acquisition module, so as to obtain the detection result of the sample to be tested. Therefore, the compact laser induced breakdown spectroscopy measurement system can solve the problem that the laser breakdown spectrum measurement technology of the prior art has separated laser focusing and spectrum acquisition, which lead difficulty in integration and miniaturization.

A laser breakdown spectra measuring system based on beam shaping comprises a pulsed laser, a focusing lens, a sample to be tested, a probe, an optical fiber, a spectrometer, a computer, an ICCD camera, and a programmable beam shaper, wherein the beam shaper is disposed between the pulsed laser and the focusing lens; a laser beam is irradiated onto the sample through the programmable beam shaper and the focusing lens to generate a plasma, the plasma spatial intensity distribution is acquired by the ICCD camera, and the beam spatial intensity distribution is continuously changed by adjusting theprogram of the programmable beam shaper to make the plasma spatial intensity distribution collected by the ICCD camera appear to be evenly distributed. At this time, the amount of ablation of the sample to be tested by the laser and the stability of the plasma spectrum are both improved. The laser breakdown spectra measuring system can make the laser ablate the sample more effectively and uniformly, thereby reducing the internal fluctuation of the plasma, and having great significance for improving the repeatability and accuracy of the LIBS technology measurement.

One or more embodiments of the invention comprise a method for creating breakdown sparks of needed brightness, sizes and duration by controlling pulse energy, pulse width, pulse duration, wavelength, temporal shape and space structure of laser radiation. Method for transformation of a dynamic image into succession of points arrangements for gaseous medium, at which breakdown sparks are produced, is disclosed. One or more embodiments of the invention comprise a method and a system for production of dynamic laser-induced images inside gaseous medium. These images are configurations of sparks which are changed by controlling the points of the gaseous medium at which the laser breakdowns are generated.

The objective of the present invention is to obtain an effective defoaming effect by directing a pulsed sound wave generated by shock caused by laser-induced breakdown to a liquid surface using an acoustic waveguide. A reflected wave of the pulsed sound wave generated by shock caused by laser-induced breakdown on an inner circumference face of the acoustic waveguide is directed to an opening part of the acoustic waveguide opposed to the liquid surface, and variations in periods of time in which the reflected wave in each travelling direction arrives at the opening part are reduced.

The system and method for creating plasma flares in air by using an ultra-short pulse laser (USPL) that generates plasma filaments with a short lifetime (in nanoseconds), and by heating these plasma filaments with intense microwave (RF) radiation to induce robust air breakdown, resulting in long lifetime (up to milliseconds) plasma flares in the atmosphere.

The invention relates to an optical fiber LIBS (Laser-induced Breakdown Spectroscopy) detection system and a method for underwater detection. The optical fiber LIBS detection system comprises a laseroutput module, an underwater optical fiber LIBS probe and a control processing module. When the optical fiber LIBS detection system is used for detection, the underwater optical fiber LIBS probe is inflated through an air nozzle, and liquid below an optical window is discharged through a water discharge port, so that an air-like environment is created near the surface of a sample to be detected, thus an efficiency of laser breakdown induced plasma and a signal-to-background ratio of collected spectrum are greatly improved; various gas medium environments can be made in the underwater optical fiber LIBS probe according to actual requirements so as to meet medium environment requirements of laser detection for various elements; the optical fiber LIBS detection system can realize simultaneousanalysis of multiple elements, is safe and reliable in operation, high in repeatability, sensitivity and measurement accuracy, high in spectral signal-to-noise ratio, high in element detection limit,high in analysis speed and high in efficiency, can be used for remote online monitoring, and effectively solves the difficulty of underwater LIBS element detection.

A quartz pitchfork type laser breakdown detection device comprises an optoacoustic absorption chamber, an excitation light source, a detection light source, a detection light modulation unit, a quartz pitchfork detector and the like. The quartz pitchfork detector comprises a resonating tube and a quartz pitchfork. During working, excitation light is focused and emitted to a to-be-detected substance, the to-be-detected substance generates a nano particle cloud cluster due to heating, the nano particle cloud cluster is diffused into the optoacoustic absorption chamber, detection light is absorbed by elements of the nano particle cloud cluster to generate an optoacoustic effect, acoustic energy accumulates in the resonating tube and is transmitted to the quartz pitchfork to output an electric signal, and accordingly, the content of a certain element in the to-be-detected substance is calculated. The quartz pitchfork type laser breakdown detection device has the advantages that laser induce breakdown and optoacoustic spectroscopy are combined, and detection limits of conventional laser induce breakdown methods are increased; the quartz pitchfork serves as the detector, and a detection system is simplified effectively; the optoacoustic absorption chamber is vacuumized, spectral line widening effect is low, detected spectral lines are easy to distinguish and low in noise, and accordingly, detection sensitivity is improved.

The invention relates to an automobile headlight, a laser auxiliary distance light module thereof, and a laser safety detection device. A reflector is provided with an opening, a detector is placed in the position, directly facing a laser light source, above the opening of the reflector, and an optical filter is arranged at the front end of the detector. According to the opening of the reflector, when blue light leakage occurs due to the fact that a conversion device is fractured or is punctured by a laser, leaked blue light reaches the detector through the opening of the reflector, and the detector judges whether blue light leakage occurs according to detected energy change. When laser leakage is detected, a feedback signal is sent to close the laser light source, and the laser light source is closed in time. According to the automobile headlight, the laser auxiliary distance light module thereof, and the laser safety detection device, real-time safety detection and passive safety protection can be achieved, a safety guarantee is provided for use of a white light laser source in the lighting industry, and harm to human eyes due to laser leakage is avoided. The technical problems that when an existing automobile lamp adopts a laser as a light source, the eyes of pedestrians and an opposite driver are harmed due to laser leakage are solved.

The invention provides an optoacoustic type laser breakdown detection device which comprises a detection light path system and an electric system, wherein the detection light path system comprises an optoacoustic absorption cavity, an excitation light source and a detection light source; a sample pond and a microphonic detector are arranged in the optoacoustic absorption cavity; when the device works, a to-be-measured substance is arranged in the sample pond, the excitation light is focused to enter the to-be-detected substance, the to-be-detected substance forms a nano particle cloud cluster which is diffused into the cavity, the detection light source enters the optoscoustic pond to be absorbed by the components in the nano particle cloud cluster so as to generate the optoacoustic effect, the content of the substances in the cloud cluster can be calculated by the sound wave strength detected by the microphonic detector, and further, the content of a certain component in the to-be-detected substance can be calculated. The optoacoustic absorption cavity is subjected to vacuum pumping during work, the excited nano particle cloud cluster is diffused in the cavity, and the pressure is small, so that the spectral line broadening effect is small, the detected spectral line can be easily distinguished from other spectral lines, the noise is low in the low-pressure state, and the optoacoustic type laser breakdown detection device has high sensitivity.

A method for correcting self-absorption effect in a laser breakdown spectrum is used for correction by regarding blackbody radiation intensity as a reference. The method comprises the following steps:firstly setting variables F and T to respectively indicate a collection efficiency parameter and an initial plasma temperature value of a light-receiving system, calculating the blackbody radiation intensity according to the F and T, then performing initial self-absorption correction with the blackbody radiation intensity as the reference and obtaining a spectrum, calculating intensities of eachspectral line according to the initially corrected spectrum, performing linear fitting using a Boltzmann plane method to obtain a slope and a linear correlation coefficient of the fitted line, and continuously adjusting the values of F and T until a specific algebraic relationship is met. Having no additional requirements on the hardware in the laser breakdown spectroscopy technology and no special requirements for the sample type and the elements contained in the sample, the method can be applied to almost all spectrums, and the corrected spectrums can effectively improve the measurement accuracy of the laser breakdown spectrum technology.

The invention discloses an absorption cavity type laser breakdown detection device which comprises an absorption cavity, an excitation light source, a detection light source, an acousto-optic modulation device, a light detector and an electronic control system for controlling the working process. According to the absorption cavity type laser breakdown detection device, a laser-induced breakdown technology and a light ring-down technology are combined; a sample to be detected is placed in a ring-down cavity; excitation light is focused and enters to the sample to be detected; under heat absorption, a nano particle cloud cluster is formed by the sample to be detected and is dispersed into the cavity; the detection light is reflected back and forth between high-reflectivity mirrors at the two ends of the ring-down cavity and is continuously absorbed by corresponding substances; the detector outside the cavity is used for detecting an emergent signal, so that the content of the substances can be calculated. By combination of the laser induced breakdown and light ring-down technologies, by use of the high-reflectivity mirrors, the detection extreme can be ppb level; before excitation light irradiation, the absorption cavity is vacuumized, so that interference of other components in air can be prevented, and widening of a spectral line can be reduced; therefore, the detected spectral line is easy to distinguish, and the flexibility is improved.

The invention discloses a detection circuit, a working method of the detection circuit, and a driving circuit. The detection circuit comprises a test line, a laser unit and a judgment unit, wherein the laser unit is used for conducting laser breakdown on an insulating layer so as to enable the test line to be connected with a signal line to be detected, the test line is used for outputting a signal to be detected of the signal line to be detected, and the judgment unit is used for judging whether a driving signal of a driver is abnormal according to the signal to be detected. The test line is isolated from the signal line through the insulating layer, when an output signal of a certain signal line of the driver needs to be tested, laser breakdown is conducted on the insulating layer so as to make the test line connected with the signal line to be detected, and at the moment, the test line can output the signal to be detected of the signal line to be detected. According to the technical scheme, on the premise that normal work of the driver is not affected, the signal to be detected output by the test line is detected so that whether the output signal of the driver is abnormal can be judged, and then adverse analysis efficiency is improved and adverse analysis cost is reduced.

The invention relates to the technical field of environment monitoring, in particular to a system and a method for automatically and continuously detecting metal in water based on laser breakdown spectroscopy. The system comprises a laser, a spectrograph, a detecting pond, a first electrode, a second electrode and a drying treatment unit; the first electrode and the second electrode are both in contact with a water sample in the detecting pond so that the metal in the water sample in the detecting pond is enriched to the first electrode; the drying treatment unit is arranged on the side of the detecting pond to dry the first electrode; a laser beam is projected on the metal which is enriched by the first electrode through the laser so that the metal generates plasmas; a spectral signal of the plasmas is detected through the spectrograph. The technical scheme of the invention has the advantages of good interference resistance, low detection limit, high detection accuracy, easiness in operation, and high automation degree.

The invention discloses an ocean-wave height adaptive underwater communication system for a communication range-finding common optical system, belongs to the field of spatial laser communication, andaims at solving problems that the adaptive adjustment of ocean waves cannot be achieved in the prior art, a laser range-finding module and a communication module are independent, the size and weight are large, and the structure is complex. The range-finding light emitted by a laser range-finding emitter and communication light emitted by a laser communication emitter are combined by a two-in-one composite optical fiber into one light source for output, and then are outputted through one common zooming system, and are finally focused at a far-field sea level or at a specified laser breakdown depth position below the sea level. The range-finding light beam is reflected by the sea surface, and the laser range-finding receives the light signal and converts the light signal into an electric signal. The electric signal is transmitted to the data processing system for calculating the height of the sea level in real time, and then the information is fed back to a controller. The controller drives the motor to change the focal length of the common zooming system, thereby adjusting the focus position of the laser range-finding light beam and the laser-excited underwater communication light beam, and forming closed-loop control.

The invention relates to an oral restoration and correction auxiliary device and provides a novel orthodontic bracket adhesive removing mode. Laser is adopted for ablating the surface of an orthodontic bracket, plasma is formed, and adhesive is removed; meanwhile, the plasma produced when the adhesive is removed is utilized for performing laser breakdown spectroscopy analysis, removed components are obtained, and the removing process can be monitored in real time; and a novel gas detecting method is designed by the invention when the adhesive is removed, gas is introduced into a spherical integrator, light absorption detection is performed in the integrator, and detection results are made more accurate.

The invention relates to a resonant cavity interior breakdown spectrum detection device. The resonant cavity interior breakdown spectrum detection device comprises a laser light source, a spectrum analysis unit, a resonant cavity and a movable sample platform, wherein the spectrum analysis unit comprises a main machine and a spectrograph, and the resonant cavity is composed of a front cavity mirror and a second cavity mirror. The resonant cavity interior breakdown spectrum detection device is characterized in that the resonant cavity, such as a resonant cavity in a solid-state laser device, is utilized, or an F-P type resonant cavity is directly used for forming a resonance state inside the resonant cavity by virtue of lasers, so that the relatively strong light intensity is produced, a to-be-detected substance is moved to a position with strong light in the resonant cavity, the to-be-detected substance absorbs heat and produces plasma, the plasma transmits light rays, and the light rays are analyzed by the spectrograph, so that ingredients and the content of the to-be-detected substance are obtained. The resonant cavity interior breakdown spectrum detection device has the advantages that the used laser has relatively high breakdown power, so that the to-be-detected substance can be ionized relatively easily, and a relatively large quantity of substance ingredients can be analyzed; and the light intensity inside the cavity is at least 10 times stronger than that outside the cavity, so that the power of the laser can be at least reduced by 10 times and more under the condition of the same effect of the light intensity inside and outside the cavity.

The invention discloses an ultrahigh-temperature thermal diffusivity measuring device, and belongs to the technical field of thermal metering. The device comprises a pulse excitation system, a high-temperature heat source system, a radiation energy-based rapid measurement system and a data processing system. The high-temperature heat source system heats a pyrolytic graphite heating body under a sealed vacuum condition to provide an ultra-high-temperature environment for a sample, in addition, the pulse excitation system is matched with a uniform laser source, focuses the laser source and collimates a focused light beam to adjust the size of a laser spot, and a laser wave band is filtered based on a filter to prevent transmission laser from puncturing an infrared detector; the filter can completely penetrate through the wave band of the infrared detector to enable the infrared detector to completely record a temperature rise signal of the sample; the light condensing sheet is positioned above the filter sheet, so that the infrared detector can rapidly record the temperature rise of the sample in a non-contact manner without recording the change of the ambient temperature, the accurate measurement of the thermal diffusivity under the ultra-high temperature condition can be realized, and the thermal diffusivity measurement temperature is increased to be more than 3000 DEG C.