8results about How to "Wide wavelength range" patented technology

The invention belongs to the field of particulate matter measuring and sensing, and particularly relates to an aerosol particle size distribution sensor and an aerosol particle size distribution measuring method.The aerosol particle size distribution sensor comprises a particle containing cavity, a spectrum sensing chip and a plurality of white light LED light sources located at different scattering angles; each scattering angle is a rotation angle formed by rotating the light beam propagation direction of the light source at the particulate matter accommodating cavity to the direction pointing to the spectrum sensing chip from the center of the particulate matter accommodating cavity; the plurality of light sources are used for sequentially emitting white light into the particle accommodating cavity, and the spectrum sensing chip is used for collecting scattered light generated by to-be-detected particles in the particle accommodating cavity based on the white light to obtain an aerosol scattered spectrum signal so as to analyze aerosol particle size distribution; the scattering angle combination formed by the scattering angles is obtained through optimization by taking the minimum aerosol parameter deviation between different aerosols of which the aerosol scattering spectrum signal difference value is smaller than a threshold value as a target. Accurate measurement of aerosol particle size distribution is realized through the sensor with a simple structure.

The invention relates to the technical field of devices for light modulation, and discloses a graphene all-optical modulator and application thereof. The graphene all-optical modulator comprises a thin silicon groove waveguide, a mode converter unit and a silicon dioxide substrate, and the thin silicon groove waveguide and the mode converter unit are located on the silicon dioxide substrate. The two sides of the thin silicon groove waveguide are respectively connected with a group of mode converter units, and the two groups of mode converter units are symmetrically distributed on the two sides of the thin silicon groove waveguide; and the thin silicon groove waveguide is covered with a graphene-hexagonal boron nitride heterojunction. Compared with the prior art, the all-optical modulator has the advantages that interaction between light and substances can be effectively enhanced, efficient all-optical modulation is achieved, meanwhile, the all-optical modulator has ultrafast response time and broadband modulation capacity, new possibility is provided for development of optical communication and optical information processing technologies, and the all-optical modulator is of great significance to development of ultrafast low-energy-consumption silicon-based optoelectronic chips.

The utility model provides plasma ultraviolet disinfection and fresh-keeping treatment equipment which comprises a box body, a horizontal isolation plate is arranged in the box body, and the box body is divided into an upper layer space and a lower layer space by the isolation plate; a host, a distribution board and components are arranged on the upper layer in the box body, and a mounting plate, a plasma generator, a near ultraviolet generator, a fan and a centrifugal fan are arranged on the lower layer in the box body; a gas cylinder is arranged outside the box body, the gas cylinder is connected with a near ultraviolet generator through a pipeline, and a gas flowmeter and a gas pump are arranged on the pipeline; an upper sealing plate and a processing cavity door are arranged on the front face of the box body, a touch display screen is arranged on the upper sealing plate, a power-on switch and a start button are arranged on one side of the touch display screen, and a door lock handle and a perspective window are arranged on the processing cavity door. High-energy particles generated by plasmas and ultraviolet rays synergistically treat crops, so that the quality of the crops can be thoroughly ensured, and the device is convenient to operate, pollution-free and high in safety. All the parts are manufactured in a modular mode and can be rapidly assembled, disassembled, maintained and installed, and practicability is high.

The invention relates to the field of laser processing, and discloses a gain optical fiber with low numerical aperture and stable absorptivity, an optical fiber laser and laser processing equipment, the gain optical fiber comprises a gain fiber core, a step layer and a cladding, the refractive index of the gain fiber core, the refractive index of the step layer and the refractive index of the cladding are sequentially reduced, the gain optical fiber has stable pump light absorptivity at the wave band of 900-1000 nm, and the step layer and the gain fiber core form a low numerical aperture structure. The gain optical fiber with low numerical aperture and stable absorptivity has high absorptivity for pump light in a wide wavelength range, the influence of the fluctuation of the central wavelength of the pump light on the light output power of the gain optical fiber is reduced, and the stability of the power output by the gain optical fiber is improved; the step layer is arranged between the cladding and the gain fiber core, so that the numerical aperture of the gain fiber core is reduced, the laser output with high beam quality is maintained, the unstable power threshold of a transverse mode is increased, and the optical coupling efficiency and the stability of the transverse mode output by the gain fiber are improved.

The invention relates to the technical field of silicon dioxide materials, in particular to anti-aging quantum dot silicon dioxide and a preparation method and application thereof. The preparation method comprises the steps that silicon dioxide or silicic acid and a carbon source are subjected to first-stage calcination in a vacuum furnace, the first-stage calcination temperature is 300-750 DEG C, the first-stage calcination time is 10 min to 8 h, then air is introduced for second-stage calcination, the second-stage calcination temperature is 300-750 DEG C, and the second-stage calcination time is 10 min to 8 h. According to the anti-aging quantum dot silicon dioxide and the preparation method thereof, the anti-ultraviolet and anti-aging properties of the material are compounded and enhanced by utilizing the quantum dot effect and the oxygen vacancy effect, and the anti-aging quantum dot silicon dioxide is added into a matrix or sprayed on the surface of the matrix, so that the ultraviolet can be effectively prevented, and the aging of the material is prevented.

The invention relates to the technical field of optical detection, in particular to a flour quality detection method and system based on optical analysis. The method comprises the following steps: firstly, acquiring a Raman spectrum image corresponding to each local detection area of a flour sample by utilizing a Raman spectrometer comprising a plurality of intelligent sensors; according to the morphological distribution characteristics of the to-be-analyzed fluctuation peak in the Raman spectrum image and the overlap ratio of the to-be-analyzed fluctuation peak and the preset frequency shift standard range corresponding to each flour component, acquiring a component fluctuation peak and a flour component corresponding to the component fluctuation peak; according to the impurity possibility degree of the component fluctuation peaks, impurity fluctuation peaks are screened out from the component fluctuation peaks; and obtaining the flour quality of the flour sample according to the overall level condition and the difference condition of the impurity measurement corresponding to all the local detection areas of the flour sample. By deeply analyzing the characteristics of the fluctuation peaks corresponding to the impurities in the flour, the fluctuation peaks corresponding to the impurities are more accurately detected, and the flour quality detection effect is improved.

This invention relates to the field of photopolymerization materials technology, and more particularly to a low-migration, oxygen-resistant photoinitiator, its preparation method, and applications, applicable to environmentally friendly coatings, 3D printing resins, and biomedical adhesives. The nano-photoinitiator of this invention is prepared from a trivalent iron salt compound and an organic ligand containing a carboxylic acid group; it generates initiating free radicals under ultraviolet and / or visible light irradiation, which are used to initiate the free radical polymerization reaction of unsaturated monomers. The system of this invention can still achieve rapid and complete curing in an air environment, significantly reducing or avoiding the oxygen inhibition effect commonly found in traditional free radical photocuring, and exhibits high stability; simultaneously, it has advantages such as wide availability of raw materials, low cost, easy aqueous phase conversion, and reduced potential irritation and migration risks, thus improving the system's biocompatibility and environmental friendliness.

The invention discloses a field calibration method and device for a built-in acoustic sensor of a transformer. The device comprises a signal generation module and a signal analysis module, the signal generation module comprises an ultrasonic transmitting module and a microcontroller; the ultrasonic transmitting module and the optical voiceprint sensor are packaged in the transformer, and the microcontroller is arranged outside the oil tank to control the ultrasonic module; the signal generation module generates ultrasonic square wave signals with fixed frequency and fixed sound intensity, the ultrasonic square wave signals and environment signals are transmitted to the optical voiceprint sensor together, the sound signals are converted into electric signals through the optical voiceprint sensor, and the electric signals pass through the filtering module to filter detection signals, so that detection and recording of discharge signals are not affected. A signal analysis module is utilized to analyze voltage signals in a limited range every three days, and the number of rising edge signals of specified trigger voltage is counted. And if the statistical result is lower than the standard value in three continuous time periods, determining that the calibration is not passed. The standards of the trigger voltage and the rising edge number are calibrated and determined through the signal generation module.