40results about How to "Spectrum stable" patented technology

The invention relates to a control circuit that is used in a double LED pointolite color light signal and comprises a lighting control part, a failure testing part and a power supply part. The control circuit also comprises an LED main light source loop and an LED auxiliary light source loop which are respectively composed of the three parts. A lighting transformer is secondarily connected in parallel with a current matcher of the lighting transformer, thus causing the primary current value to reach the rated range which ensures that a filament relay can work normally. The control circuit adopts constant current power supply so as to eliminate the influence on the current value of the LED loops caused by voltage fluctuation. A current detecting chip and a current sampling resistance are adopted and connected in parallel so as to form a detection unit which is connected in series to the LED main light source loop, and the anode of the LED main light source loop is taken as a voltage detecting point. When open circuit or short circuit occurs to the LED main light source loop, the output value of a detecting circuit changes accordingly and controls the output state of a comparator, thus further controlling opening or closing a switch MOS conduit in the loop and realizing the switch between a main light source and an auxiliary light source and failure warning. When railway signal lamps are replaced by the LED, the existing circuit equipment are not necessary to be changed, which ensures the reliability of a signal interlocking circuit.

There is provided an optical film including an ultraviolet light absorbent having a first peak with a maximum absorption coefficient of 0.07 to 0.10 phr−1 μm−1 in a wavelength band of 290 to 320 nm and a second peak with a maximum absorption coefficient of 0.11 to 0.16 phr−1 μm−1 in a wavelength band of 330 to 400 nm, an acrylic resin, and a hindered amine light stabilizer (HALS), and a polarizing plate including the same.

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 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 stacked white light organic light emitting diode, which is composed of an anode, a first electroluminescent unit, a charge generating unit, a second electroluminescent unit and a cathode, the first electroluminescent unit and the second electroluminescent unit The light-emitting layer is a symmetrically doped sandwich light-emitting layer structure capable of emitting two colors. The colors of the light emitted by the first electroluminescent unit and the second electroluminescent unit are different, and the wavelength bands of the emitted light are complementary, and they are mixed to form a three-color or Four-color broad-spectrum white light emission. The stacked white organic light-emitting diode of the present invention realizes three-color or four-color high-efficiency, color quality and color stability white light emission only by connecting two electroluminescent units with a charge generation unit, and has a simple structure, easy preparation process, and easy industrialization. chemical production.

The invention discloses a full optical fiber type supercontinuum laser source based on a multi-component-doped silica optical fiber. The full optical fiber type supercontinuum laser source comprises a semiconductor laser pumping source, a multimode optical fiber combiner, a first high reflectivity optical fiber grating, a Yb-doped double-clad optical fiber, the multi-component-doped silica optical fiber and a second high reflectivity optical fiber grating. The semiconductor laser pumping source is used for providing excitation energy; the optical fiber grating pair is used for forming laser oscillation; the Yb-doped double-clad optical fiber is used for providing laser gains; and the multi-component-doped silica optical fiber is used for generating a saturated absorption effect, further inducing stimulated brillouin scattering to generate ultra-short pulse laser output and getting supercontinuum laser output by excitation. Through combination of the semiconductor laser pumping source, the Yb-doped double-clad optical fiber and the multi-component-doped silica optical fiber, a photonic crystal optical fiber in a microstructure does not need to be adopted. The super continuum laser source with a simple structural form, higher output power, wide spectral range and good flatness can be obtained.

The invention discloses a real-time Raman spectrum stabilization method based on the external reference method and photobleaching; the first step is system construction; the second step is photobleaching of the product to be tested before measurement; the third step is static measurement and Dynamic measurement; the real-time Raman spectrum stabilization method based on the external reference method and photobleaching of the present invention, through the optical fiber multiplexing method, using wavelength division multiplexing technology, transmits two Raman spectral signals in the optical fiber at the same time; through two One path of optical fiber, one path is used as the measurement signal, and the other path is used as the external reference signal, and the real-time Raman spectrum is stabilized by the external reference method; at the same time, before the measurement, the sample is irradiated with a laser irradiation device for a certain period of time to weaken the fluorescence of the sample; The spectrum is stable; the sample or laser is moved during the measurement process in the final detection to improve the heat conduction of the sample; the spectrum is stable during the detection process.

The invention provides a rare earth doped luminescent glass and a preparation method thereof. The rare earth doped luminescent glass is prepared from the following components in parts by molar: 40 to70 parts of SiO2, 1 to 20 parts of P2O5, 2 to 20 parts of Al2O3, 5 to 20 parts of ZnO, 5 to 20 parts of CaO, 5 to 20 parts of Na2O, and 0.01 to 0.4 part of rare earth luminous source. The luminescent glass is prepared in an air atmosphere by adopting a melt cooling method; by changing the glass matrix composition, in particular, adjusting the content of P2O5 in the glass, the spontaneous crystallization of a glass melt during the cooling process is regulated, thereby adjusting the luminescence performance of the luminescent glass. The luminescent glass provided by the invention has good mechanical properties and stable chemical properties, can control the spectrum by a simple method, and can replace a phosphor and an epoxy resin in an LED (Light Emitting Diode) light-emitting device.

The invention discloses a single-component electroluminescent device and a preparation method thereof. The device uses a single-component perovskite material as a light-emitting active layer, injects carriers through the transport layer, and generates limited Exciton state luminescence, its electroluminescence spectrum can cover the entire visible light region. The present invention enters the field of electroluminescent white light by introducing a new mechanism. Compared with the prior art, the preparation process is simple, only one light-emitting layer is needed to realize wide-spectrum white light, and it can effectively solve the problem of unstable spectrum of existing electroluminescent white light. question.

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 belongs to the field of porous materials, and discloses a fluorescent / phosphorescent mixed white light organic light-emitting diode and a preparation method thereof. The structure of the fluorescent / phosphorescent hybrid white light organic light-emitting diode includes a glass ITO anode, a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, an electron transport layer, an electron injection layer and an aluminum cathode from bottom to top. ; The light-emitting layer sequentially includes a red phosphorescent light-emitting layer, a light color adjustment spacer layer, a yellow phosphorescent light-emitting layer, a blue fluorescent light-emitting layer and a green phosphorescent light-emitting layer from bottom to top. The organic light-emitting diode of the invention exhibits electroluminescence characteristics of high efficiency, high color rendering index, good spectral stability and low efficiency roll-off under high brightness, and has good application potential in the fields of display and lighting.