9 results about "Far-infrared laser" patented technology

The invention relates to a plastic composition which is characterized by comprising the following components in parts by weight: 88-100 parts of polymer resin; 0.1 to 2 parts of a compound laser marking agent; 0.02-1 part of a black coloring agent; 0.2-1 part of an organic color pigment; the compound laser marking agent is selected from compounding of an ultraviolet laser sensitive agent, a near-infrared laser sensitive agent and a far-infrared laser sensitive agent. By compounding the laser marking agent, ultraviolet laser marking, near-infrared laser marking and far-infrared laser marking can be achieved at the same time, the composition can be induced to generate different optical effects such as pigment color and / or structural color, permanent marks of multiple colors (laser marks of at least two colors) are formed on a single base material, the process is simple and efficient, and the cost is low. And the marking effect is bright and the anti-counterfeiting property is strong.

This invention relates to the field of laser technology, and particularly to a Raman laser that outputs 9.2μm far-infrared laser light. It includes a laser pump beam splitting module, a first-order Raman laser generation module, a difference-frequency seed light preparation module, a laser beam combining and tuning module, a second-order Raman amplification module, and a laser collimation and separation module arranged sequentially along the optical path. The laser pump beam splitting module is used to achieve beam splitting and control of the 1064nm laser; the first-order Raman laser generation module is used to generate a 1.9μm first-order Raman laser from hydrogen; the difference-frequency seed light preparation module is used for difference-frequency preparation of the 9.2μm Raman seed light; the laser beam combining and tuning module is used for spatiotemporal overlap and beam combining of the pump light and the seed light; the second-order Raman amplification module is used for Raman amplification of the 9.2μm laser; and the laser collimation and separation module is used for collimation and separation of the target laser output. This invention utilizes a difference-frequency method to generate wavelength-matched far-infrared Raman seed light, and performs Raman amplification to ultimately obtain a 9.2μm far-infrared Raman laser with high pulse energy and high peak power.

The present disclosure provides a kind of dual-wavelength tunable all-solid-state mid-infrared laser, it relates to laser technical field, to solve the technical problems that high-performance dual-wavelength 3 μm band laser and its pump generation mid-infrared band laser are difficult to obtain in prior art.The mid-infrared laser includes: erbium-doped laser and optical parametric oscillator, the erbium-doped laser is used to provide dual-wavelength 3 μm band pulsed laser, wherein, erbium-doped laser includes: pump source, erbium-doped laser medium, gain modulation device, high reflection mirror and output mirror;Optical parametric oscillator is used under the pumping action of dual-wavelength pulsed laser in 3 μm band, and the mid-infrared laser of dual-wavelength output is obtained.The mid-infrared laser is simple in structure, easy to use, can obtain tunable dual-wavelength mid-infrared pulsed laser with high beam quality, meets the light source demand of differential absorption laser radar remote sensing toxic gas and photoelectric countermeasure.

The invention relates to the field of driving state detection, and discloses a TOF-based steering wheel hand separation detection device and method, and the device comprises a far infrared laser emission unit, a photoelectric sensor unit, a processing main control unit and a narrow-band optical filter assembly. The far infrared laser is electrically connected with the processing main control unit; the photoelectric sensor unit is electrically connected with the processing main control unit; the narrow-band optical filter assembly is arranged at the front end of the photoelectric sensor unit and only allows the target laser band to pass through. According to the method, a deep learning algorithm is introduced to identify and judge a dynamic hand area, and real-time monitoring of the state whether a driver holds a steering wheel or not is realized, so that the safety and the practicability of an automatic driving assistance system (ADAS) are improved, and the technical and regulation requirements of an intelligent networked automobile on driver state monitoring are met.

The application discloses a dynamic fixed-point number adaptive PID design method based on error amplitude feedback, which is characterized in that a PID controller detects the amplitude of a current frequency error in real time, and dynamically adjusts the bit width distribution mode of a fixed-point number in a PID operation process according to an error interval, so that the controller has stronger dynamic range in a large error stage, has higher operation resolution in a small error stage, and better balances the fast regulation ability and the steady-state control precision of a system. Specifically, the method comprises the following steps: (1) obtaining the real-time frequency of a signal through fast Fourier transform, and saving a reference frequency value transmitted by an upper computer; (2) comparing the reference frequency with the actual signal frequency to obtain the frequency error at the current time, judging the error interval in which the current system is located according to a threshold value, and switching to a corresponding fixed-point format; (3) completing proportional, integral and differential operations according to the incremental PID control, selecting the corresponding control shift bit number according to the fixed-point format, and calculating the control increment between adjacent two sampling time points and the output control amount of the PID. Through real-time feedback of the error amplitude, the method dynamically optimizes the numerical expression precision of the PID calculation, so that the controller can automatically match a more suitable operation format according to the current error interval. In a laser frequency stabilization system, the dual requirements of large disturbance fast response and steady-state high-precision locking can be met, and the long-term stable operation requirement of a far-infrared laser interferometer is better adapted.

The utility model discloses a malodorous gas imaging monitoring device based on laser radar, which relates to the technical field of malodorous gas monitoring and comprises a base and a shell connected with the middle of the upper end of the base, and a connecting pipe is arranged between the base and the shell. A single photon avalanche diode detector is mounted at the upper end of the base and located at the center of the connecting pipe; an optical window is arranged at the upper end of the outer surface of the shell, and a camera module, a modulator and a middle and far infrared semiconductor laser transmitter are sequentially arranged in the shell from the center to the edge; according to the design, on the basis of the medium and far infrared laser gas absorption principle, a malodorous gas leakage source can be recognized and quantified in a large-range environment, a malodorous gas diffusion image can be generated, and the problem that when a traditional sensor is used for detection, the malodorous gas leakage source cannot be recognized and quantified, and the malodorous gas diffusion image cannot be generated is solved. And the problems are solved.

The application discloses a laser gas measurement method and product based on nonlinear output of a laser, and aims at the problem that a traditional TDLAS harmonic method cannot accurately measure gas concentration when obvious nonlinear effect occurs in laser output of a mid-infrared and mid-far infrared laser. An infrared laser signal passing through a gas to be measured is acquired, and the infrared laser signal is converted into an electric signal to obtain a voltage signal of the laser signal; an initial frequency of the infrared laser signal is f; the voltage signal is synchronously collected, and phase-locked amplification is performed on a 4f frequency band signal of the voltage signal to obtain a voltage curve of the 4f signal; an absorption amplitude is calculated according to a peak-to-peak value, and after correction by a calibration coefficient and temperature and gas pressure, a gas concentration is obtained. The method provided in the application can be applied to a nonlinear output laser to accurately calculate and obtain the gas concentration.

The embodiment of the application discloses a single-layer metasurface structure for simultaneously realizing low reflection of near-infrared and far-infrared laser, low infrared radiation and heat management, the single-layer metasurface structure comprising a bottom continuous metal film, an intermediate dielectric film layer and a top discrete metal layer; the bottom continuous metal film layer is used for realizing total reflection of electromagnetic waves so that the transmittance is zero; the intermediate dielectric film layer is used for introducing resonant absorption at a wavelength of 10.6 mu m and controlling the phase of the incident electromagnetic wave reflected by the bottom continuous metal film by adjusting the thickness thereof; the top discrete metal layer is arranged on the intermediate dielectric film layer and is used for forming a reflection phase difference of the incident electromagnetic wave in the metal region and the non-metal region to realize regulation and control of the near-infrared electromagnetic wave scattering field wave front and is also used for introducing localized surface plasmon resonance to realize infrared selective absorption.

The application discloses a high-spatial-resolution far-infrared laser interferometer and relates to the technical field of optical interferometers.The high-spatial-resolution far-infrared laser interferometer comprises an optical platform, an optical tower, an optical support and a phase comparator system, the optical platform is fixedly provided with a far-infrared laser light source, a heterodyne interferometer table light path, a single-point frequency mixer and a linear array frequency mixer, the far-infrared laser light source comprises a first far-infrared light source and a second far-infrared light source, the light signal transmitting ends of the first far-infrared light source and the second far-infrared light source are connected with the heterodyne interferometer table light path, the far-infrared laser light emitted by the two far-infrared light sources enters the single-point frequency mixer through the interferometer table light path, the linear array frequency mixer is used as a detection channel frequency mixer and is used for receiving the signals emitted by the two sources, and the application realizes the system layout of multi-position detection under a single detection channel light path and provides a reliable measurement tool for high-spatial-resolution measurement of plasma electron density.