40results about How to "Spectrum stable" patented technology

Optical cells are non-actively compensated to ensure that a sample gap of a sample space remains nearly constant upon a change in temperature. Fluids can be flowed through the sample space of the optical cells.

The invention relates to an LED (light emitting diode) light source with a stable radiation spectrum and a control device thereof. The LED light source comprises an LED chip, an aluminium baseplate, aluminium heat radiation fins, a temperature sensor, a semiconductor refrigerating piece and a fan, wherein the LED chip is welded on the LED aluminium baseplate, the aluminium baseplate and the aluminum heat radiation fin are closely pasted through heat conduction silica gel, and a hole is punched on the aluminium heat radiation fin; the temperature sensor is inserted in the hole, a temperature sensor guideline is leaded out so as to seal the hole through the heat conduction silica gel, the heat conduction silica gel is used for pasting the other surface of one aluminum cooling fin on the semiconductor refrigerating piece, and the other surface of the semiconductor refrigerating piece is mutually pasted with the other aluminium heat radiation fin which is provided with a fan; and the LED light control device takes a singlechip as a control core, the semiconductor refrigerating piece is adopted as a temperature-controlling element, a constant current source circuit which is composed ofa current negative feedback provides working current for the semiconductor refrigerating piece, and the output current of the constant current source is controlled by the voltage output by a result control D/A (digital to analog) transducer after PID (proportion integration differentiation) operation by the singlechip. The LED light source provided by the invention is used for an open light path dusty gas spectrographic detection system, and provides the stable spectrum for the concentration inversion of a measuring system.

The invention discloses a method and device for calibrating absolute spectral response of a photoelectric detector, relating to the test of photoelectric detectors. The device is provided with a grating spectrometer, a photoelectric acquiring circuit, a computer, a to-be-tested photoelectric detector, a standard spectral irradiance probe, a sleeve, a convergent lens set, a light source, an LED (Light Emitting Diode) temperature controlled clamp and an LED current stabilizing source, wherein the relative spectral response of the to-be-tested photoelectric detector is measured to obtain a relative spectral response curve, the probe and the light source are fixed in the sleeve, an LED is turned on and a clamp is opened, spectral irradiance distributions of the LED under different currents are measured, the probe is removed, the to-be-tested photoelectric detector is fixed in the sleeve, response current values of the to-be-tested photoelectric detector under illumination of different wavelengths are acquired by the photoelectric acquiring current and are sent to the computer; and the absolute spectral response of the to-be-tested photoelectric detector can be figured out by using the relative spectral response and the response current of the to-be-tested photoelectric detector under the illumination of the LED light source. Finally, a response-wavelength curve is drawn.

The invention relates to a highly effective two-tone white light high molecular material and it's preparing method in the field of lighting material technology. The chemical structure of the highly effective two-tone white light high molecular material is as the right type, wherein x=0.00001-0.5. The preparing method is that it uses polymer fluorenes as blue light structure unit, 4, 7-2 (4-(N-phenyl -N-(4-methyl phenyl) amino) phenyl)-2, 1, 3 -benzodithiazole as orange light structure unit, it uses combined polymerization mode to lead the orange light work unit into the blue light macromole fundamental chain by chemical key mode to prepare for the highly effective two-tone white light high molecular material.

The invention discloses a preparation method and application of mixed halogen perovskite quantum dots. The main synthesis process comprises the following steps: adding lead halide in different proportions into a strong polar solvent solution, carrying out ultrasonic dissolution, and injecting into a weak/non-polar solvent containing a ligand and cesium salt to obtain the mixed halogen perovskite quantum dot. The process equipment is simple, no protective gas is needed, operation is easy, convenient and efficient, large-scale production can be achieved, and the obtained quantum dots are good in crystallinity, high in spectral stability and excellent in luminescent property. The method can be applied to the technical fields of wide-color-gamut LED backlight source display, flexible display, Micro-LED full-color display, solar cells, fluorescence sensing, light or photoelectrocatalysis, light detectors and the like.

The invention relates to a laminated white light organic light emitting diode which is composed of an anode, a first electroluminescent unit, a charge generation unit, a second electroluminescent unitand a cathode. The light emitting layer of the first electroluminescent unit and the second electroluminescent unit has a symmetrically doped sandwich light emitting layer structure capable of emitting two colors. The first electroluminescent unit and the second electroluminescent unit emit light in different colors, and the bands of the emitted light are complementary to each other and the emitted light is mixed to form three-color or four-color wide-spectrum white light emission. According to the laminated white light organic light emitting diode, white light emission of three-color or four-color high efficiency, color quality and color stability can be realized only in a way that the charge generation unit is connected with two electroluminescent units so as to be simple in structure,simple in preparation process and easy to industrialize.

The invention relates to a polyamide pattern painting camouflage fabric printing process and a fabric production and processing method. The printing process is used for printing a pattern painting camouflage color, and vat grey M is added into color paste of the pattern painting camouflage color. The processing method comprises a coating finishing procedure, wherein coating finishing is performed on a waterproof set fabric printed with the pattern painting camouflage color, and a flame-retardant coating is completed according to a sequence of firstly performing bottom glue blade coating and calendaring, then performing middle glue blade coating and finally performing surface glue blade coating; during the bottom glue blade coating, the temperature of a drying oven is controlled to be close to the temperature of a cross-linking agent in a bottom glue formula, the vehicle speed is regulated and controlled, methylbenzene in polyurethane glue is completely volatilized, bottom glue is in a dried state, but part of the cross-linking agent does not completely react to form a net structure, more bottom glue is extruded into yarn gaps of a fabric during subsequent calendaring, and further the cross-linking agent reacts with the polyurethane glue and a curing process is finished. The color fastness of the fabric is stable, and the dark color migration phenomenon is reduced. The production and processing method meets the use requirements of novel equipment such as carrying tools and bulletproof vests.

The invention relates to the technical field of plasma light sources, and especially relates to a plasma light source cavity for laser maintenance. The plasma light source cavity comprises a quartz cavity, an electrode connector and filling gas in the cavity. The quartz cavity comprises a sealing area and a bulb; the sealing area is a tubular body communicated with the end part of the bulb, and the inner cavity of the bulb is an ionization cavity; and one or more electrode connectors used for plasma triggering are packaged in the quartz cavity, each electrode connector comprises a conductive column, a molybdenum sheet and an electrode body, an electrode tip is arranged at the head end of each electrode body, the head of each electrode tip is a conical tip, the molybdenum sheet and the conductive column are sequentially welded to the tail end of each electrode body, the electrode tip is located in the bulb, the molybdenum sheet is located at the press sealing position of the sealing area, and the conductive column is located outside the quartz cavity. The plasma light source cavity can maintain triggering of the plasma and limit gas used for generating the plasma, and stable luminous intensity and spectrum are maintained.

The present invention belongs to a molecular dispersion type white light macromolecular material and its preparation technology field. It is characterized by that according to the principle of 'blue light orange light can be used to synthesize white light' said invention can simultaneously introduce wathet blue light doping agent unit and orange light doping agent unit into dark blue light macromolecular main body by utilizing mode of covalent bond so as to obtain the invented molecular dispersion type white light macromolecular material. It can be used in the field of electroluminescence device, plate display device, background power supply and illumination light source, etc.

The invention discloses a white light electroluminescent device and a preparation method and application thereof. The white light electroluminescent device comprises a laminated structure formed by a perovskite light-emitting unit, a middle layer and an organic light-emitting unit in sequence, spectrums of the perovskite light-emitting unit and the organic light-emitting unit are complementary, and the two light-emitting units jointly emit and are compounded to obtain white light. The preparation method of the white light electroluminescent device comprises the following steps: sequentially depositing each layer in a spin coating, spray coating, blade coating, thermal evaporation, printing or ink-jet printing manner to form a laminated structure, thereby obtaining the white light electroluminescent device. The white light electroluminescent device has the advantages of high efficiency, stable spectrum and the like, is low in manufacturing cost and simple in preparation process, and can completely meet the requirements of high-quality illumination and display.