150 results about "Fluorescent spectra" patented technology

The relative intensity of fluorescent light of a melt-polycondensed aromatic polycarbonate produced by the transesterification process (melt polymerization process) of an aromatic dihydroxy compound and a carbonic acid diester in the presence of a catalyst comprising a basic nitrogen compound and/or a basic phosphorus compound in combination with an alkali metal compound is suppressed to 4.0x10-3 or below at a wavelength of 465 nm based on a standard substance in a fluorescent light spectrum obtained by the excitation wavelength of 320 nm. An aromatic polycarbonate having good color stability, especially good stability to the deterioration of the chip color during storage of the chip in air at room temperature can be produced by the present invention.

The invention discloses a method for detecting and monitoring cracks of mechanical parts by utilizing fluorescent quantum dots, and relates to material detection and analysis by utilizing optical methods. The method comprises the following steps: preparing solidifiable quantum dot film forming resin; solidifying at a part to be detected to form a fluorescent quantum dot resin coated film; carrying out a tensile test on a metal CT (Compact Tensile) specimen coated with quantum dot resin coated film to obtain fluorescence spectrum sample data; irradiating the fluorescent quantum dot resin coated film at the part to be detected by using an excitation light source, monitoring whether fatigue cracks occur at the part to be detected or not, and collecting and storing fluorescence spectrum historical data; if the fatigue cracks occur at the part to be detected, determining the width of cracks, and sending safety pre-warning. By detecting the quantum dot resin coated film solidified on a monitored mechanical part, the method disclosed by the invention has the advantages that tiny fatigue cracks on the mechanical part in an early stage can be discovered, the detection precision is high, the cost is low, influence caused by the appearance of a detected component can be avoided, dangerous parts of important mechanical parts can be subjected to real-time safety monitoring, and the application range is wide.

The Bi doped germanium base optical glass has the molar composition of: GeO2 90-99.98 mol%, M 0.01-9 mol%, Bi2O3 0.01-5 mol%, where M is Al2O3, Ta2O5, Ga2O3 or B2O3. The glass has absorption spectrum covering the area from visible light to near infrared, central fluorescent spectrum wavelength in 1300 nm, fluorescent life greater than 0.2 ms and fluorescent full width at half maximum greater than 200 nm, and may be pumped with laser of 532 nm, 632.5 nm and 808 nm wavelength. These kinds of optical glass are expected to find the use in ultra wide band amplifier, high power laser, tunable laser and other technological fields.

The invention discloses a sulfur phosphorus nitrogen co-doped carbon point with adjustable fluorescence property and a preparation method of the of sulfur phosphorus nitrogen co-doped carbon point. According to the technical scheme, the carbon point is prepared by processing cucumber juice as a precursor by virtue of a hydrothermal method in one step, has the particle size of 2-8nm, and is an amorphous fluorescent carbon point with the average particle sizes of 5.6nm, 3.5nm and 2.7nm respectively; the wavelengths of corresponding fluorescent spectrums are 450nm, 505nm and 571nm respectively. According to the preparation method, no chemical reagent is added, only the cucumber juice is taken as a unique raw material, a reaction is carried out in a hydrothermal reaction kettle, so that the preparation method is environmental friendly and is convenient, quick and good in repeatability.

The invention belongs to the field of small molecular fluorescent probes and particularly relates to a near infrared fluorescent probe for detecting zinc ions in a water phase and a preparation method thereof. The near infrared fluorescent probe for detecting the zinc ions in the water phase is structured in the specification. The fluorescent probe has the advantages of high selectivity and high sensitivity, as well as an emission peak of fluorescence spectrum in a near infrared area, low cytotoxicity, good membrane permeability and good water solubility. The fluorescent probe has a capability of detection of the zinc ions and fluorescence imaging in cells.

A system and method to test for the presence of target molecules in a biological test sample includes test molecules, a microfluidic chip, and irradiating and detection devices. The test molecules include bio-recognition molecules conjugable with the target molecules, and the corresponding conjugates. The microfluidic chip includes sample channels and flow focusing channels adjoining the sample channels. A buffer exiting from the focusing channels directs a single-file stream of the test molecules through one of the sample channels. The irradiating device delivers radiation for absorption by the test molecules in the single-file stream. After absorption, the test molecules emit fluorescence of a distinct fluorescent spectrum for each of the conjugates. The detection device monitors identifies the presence of the conjugates by monitoring for the distinct fluorescent spectrum. Thus, the test system and method identifies the presence of the target molecules in the test sample.

The invention relates to a synthesis method of a Schiff base sensor molecule, and belongs to the technical field of anion detection. The sensor molecule has the advantages of highly selective colorimetric fluorescent binary channel identification of CN<-> in water, short response time, and no influences of anions on the detection process. Determination results show that the naked eye detection limit and the fluorescent spectrum detection limit of the sensor molecule to CN<-> in water are 2.0*10<-6>mol/L and 3.42*10<-8>mol/L respectively, and are far lower than the content standard (below 1.8muM) of normal drinking water, prescribed by World Health Organization.

The invention relates to an optical excitation fluorescent spectra system having no requirement of stability of excitation light source, which comprises a light source, a spectrometer, an exciting light converging element, a beam splitter, a light intensity meter, a sample, an emitted light collecting element, an emission spectrometer, a detector and a computer, wherein the spectrometer is arranged behind the light source and used for dispersing a broad-spectrum optical signal sent by the light source into a narrowband light source or monochromatic source, the exciting light converging element is arranged behind the spectrometer and used for converging exciting light emitted by the spectrometer on a sample to be tested, the beam splitter is arranged behind the exciting light converging element and used for reflecting part of the exciting light emitted by the spectrometer to another direction to enter a light intensity meter, the light intensity meter is arranged at one side of the light path of the beam splitter and used for detecting the intensity of the exciting light reflected by the beam splitter and using the intensity as a reference light intensity, the sample is arranged behind the beam splitter, the emitted light collecting element is arranged behind the sample and used for converging the signal light emitted by the sample to an inlet of the emission spectrometer, the emission spectrometer is arranged behind the emitted light collecting element and used for dispersing the signal light to a the detector, the detector is arranged behind the emission spectrometer and used for detecting the intensity of a spectral signal dispersed by the emission spectrometer, and the computer is respectively connected with the spectrometer, the light intensity meter, the emission spectrometer and the detector and used for controlling the running of the whole system.

The invention discloses N-(2,4-dinitrophenyl)-rhodamine B hydrazide and a preparation method and an application of the N-(2,4-dinitrophenyl)-rhodamine B hydrazide. The rhodamine B derivative provided by the invention is N-(2,4-dinitrophenyl)-rhodamine B hydrazide, the structural formula of which is I. The N-(2,4-dinitrophenyl)-rhodamine B hydrazide, is colorless and free from fluorescence, but can selectively react with Cu<2+> ions in chromogenic and fluorescent opening reaction. The colorless substance generates a system with excellent optical performance, so that the detection sensitivity and selectivity of Cu<2+> ions are greatly improved. Therefore, the N-(2,4-dinitrophenyl)-rhodamine B hydrazide is appropriate for high selectivity and high sensitivity detection for the Cu<2+> ions. Detection can be carried out by a light absorption spectrum and a fluorescence spectrum. (FORMULA I).

The invention relates to a water quality monitoring probe based on an ultraviolet visible absorption spectrum and a fluorescence spectrum. The water quality monitoring probe comprises a flash lamp, a first convex lens, a first water quality monitoring window, a second water quality monitoring window, a multi-wavelength laser source for exciting fluorescent light, a third water quality monitoring window, a chopper, a convex lens, an ultraviolet visible fiber spectrum measurer, a controller signal processor, a flash lamp controller, a multi-wavelength laser source controller for exciting fluorescent light and a stepping motor. A water sample can be scanned by a continuous ultraviolet visible spectral region, continuous absorbancy information in water quality is acquired, various parameters in the water quality are acquired by a diversified analyzing means, water characteristic information in the various data is calculated, a correcting model between spectrum data and the water quality parameters is established according to the data, and the model is used as a tool to realize water quality parameter analysis.

The invention relates to a fluorescence spectrum imaging technique, aiming at solving the problem of fuzzy single-molecule fluorescence imaging arising from the fluctuation in molecular fluorescent radiation and lower signal-to-noise ratio. The invention provides a method and device for improving the definition of single-molecule fluorescence imaging. The method comprises the following steps of: scanning and irradiating a single-molecule sample by using laser which is subjected to intensity modulation by an acousto-optic modulator; receiving fluorescent photons emitted by the single-molecule sample and converting the fluorescent photons into a standard logic electrical pulse output signal by using a single-photon detector; inputting the logic electrical pulse output signal to a lock-in amplifier, meanwhile, inputting a synchronous sine waveform modulated voltage signal to the lock-in amplifier; and demodulating the logic electrical pulse output signal to obtain a detected fluorescence spectrum signal and imaging the fluorescence spectrum signal. According to the invention, the intensity modulation to the single-molecule fluorescent photons is achieved by using an intensity modulated excitation light field, the quantum fluctuation in photon counting is eliminated by using analog signals demodulated by the lock-in amplifier, the signal-to-noise ratio is increased, and therefore, the high-definition single-molecule fluorescence imaging is achieved.

The invention provides a method for determining the infiltration depth and infiltration capacity of a protection agent on the surface of a cement-based material through a fluorescent dye. The method comprises the following steps: mixing the protective agent with the fluorescent dye reaching up to the amount of testing, making a mixture of the fluorescent dye and the protective agent act on the surface of the cement-based material at a certain age, sampling at different depths of the cement-based material, and performing fluorescence spectrum detection on samples, thereby obtaining the infiltration depth and concentration distribution of the fluorescent dye according to a ratio of fluorescence strength, the fluorescent dye and the protective agent, and further obtaining the content of the protective agent in different depth ranges of the samples. The method is simple and feasible, is short in measurement period, low in cost and wide in application range, can be applied to quantitative analysis on the concentration and mass distribution of the protective agent at different infiltration depth parts, and can be used for precisely evaluating the infiltration performance of the protective agent on the surface of the cement-based material and further effectively controlling the exertion of effect of the protective agent in the cement-based material.

The invention relates to a fluorescent probe and detection method for detection of methamphetamine or/and ketamine. The fluorescent probe is characterized in that it is a substance composed of an aryl methyl alcohol structure and can emit fluorescence. The detection method consists of: preparing a solution of the probe, coating a substrate surface with the solution, and performing volatilization to remove the solvent so as to obtain a sensing film; and dropping a to-be-detected methamphetamine or ketamine solution to the sensing film surface directly, contrasting the fluorescence color and brightness change before and after dropwise adding, thus realizing detection of methamphetamine or ketamine. Specifically, Ar is a group selected from A1-A20. The detection method provided by the invention has the advantages of quick and sensitive detection reaction, the whole detection process can be realized within a few seconds, and the detection process has no need of adding any auxiliary reagent, thus avoiding background interference and reagent pollution. The probe can react with drugs to cause the change of the absorption and fluorescence spectrum of the material, and whether drugs exist can be determined according to the spectral signal change, also the drug concentration can also be determined according to the change degree, thereby realizing qualitative and quantitative detection of drugs.

The present invention proposes a remote sensing detection device for multi-wavelength time-sharing excitation of fluorescent substances in water, including a data processing system, the data processing system is connected with a laser controller, and the laser controller is also connected with a multi-wavelength laser emission system, the multi-wavelength The laser emitting system emits lasers of different wavelengths to targets on the sea surface, and the fluorescent substances in the seawater are stimulated to radiate fluorescence. The remote sensing detection device also includes a telescope for receiving fluorescence, and is used to disperse the optical signal transmitted by the telescope into wavelengths. A light splitting system of optical signals arranged in sequence, and an ICCD camera for collecting the light signals formed by the light splitting system, the ICCD camera is connected with the data processing system. The above-mentioned remote sensing detection device combined with the time-sharing excitation detection method can make full use of the analysis capabilities of discrete and fusion fluorescence spectra under different wavelength excitation light sources, effectively increasing the qualitative and quantitative analysis capabilities, making it especially suitable for the rapid measurement of the composition and content of fluorescent substances in water .

The chip includes upper piece of organic glass, and lower piece of organic glass. N pieces of independent simulation micro channel are setup on the said lower piece of organic glass. Being setup on upper piece of organic glass, micropores are corresponding to two ends of the said micro channels, and micropores are sealed. Using hot pressing linkage seal upper piece of organic glass and lower piece of organic glass permanently. Fluorescent materials with incremental fluorescence intensities are injected to N pieces of independent simulation micro channel in sequence. The selected fluorescence intensities can reflect changing trend of amplification curve of number of replications for characteristic gene of the biologic PCR fluorescent reagent. The invention solves issue of working calibration of detection device for PCR fluorescence spectrum.

The invention discloses a CN<-> sensor molecule. Identification of CN<-> by the sensor molecule is realized through CN<-> addition, deprotonation, and hydrolysis under the action water to form a ketone structure, and the above reaction has the advantages of good selectivity on CN<->, high identification sensitivity, short reaction time, and no interference of other anions to the detection process. Titration experiments show that the naked eye detection limit of the above sensor to CN<-> in water is 2.4*<-6>mol/L, the fluorescent spectrum detection limit is 8.00*10<-7>mol/L, and the detection limits are far lower than the content standard (below 1.9[mu]M) of CN<-> in normal drinking water, prescribed by World Health Organization. Compared with traditional CN<-> sensor molecules, the CN<-> sensor molecule disclosed in the invention has the characteristics of cheap and easily available raw material, simple and easy synthesis process, and low synthesis cost, so the sensor molecule in the invention has potential application values.

The invention relates to a preparation method of a Tm<3+>-doped yttrium lanthanum oxide laser transparent ceramic material, belonging to the field of manufacturing processes of special ceramic materials. The preparation method comprises the following steps: preparing national high-purity (4N purity) Tm2O3 nano powder, La2O3 nano powder and Y2O3 nano powder, which are used as raw materials, in a certain mol ratio, forming by a traditional ceramic preparation technique, and carrying out solid-phase sintering to obtain the compact Tm:Y<2-2x>La<2x>O<3> (namely Y<2-2x-2y>La<2x>Tm<2y>O<3>) transparent ceramic. The Tm<3+>-doped yttrium lanthanum oxide laser transparent ceramic material has favorable optical properties. The Tm<3+>-doped yttrium lanthanum oxide laser transparent ceramic material has the advantages of simple preparation technique and low manufacturing cost, and is beneficial to industrial large-scale production. The transmittance light spectrum experiment indicates that the sample has high transmittance near 2 mu m, and has an obvious absorption peak near 800nm, and the LD can be directly used as a pumping source. The fluorescent spectroscopy displays that the peak value is at 1931nm, which indicates that the Tm<3+>-doped yttrium lanthanum oxide laser transparent ceramic material is hopeful to become a 2 mu m laser working medium material.

The invention discloses an aluminum ion fluorescent probe and a preparation method thereof. The method comprises the following steps: synthesizing 7-hydroxycoumarin-8-aldehyde by taking hexamethylenetetramine, 7-hydroxycoumarin and glacial acetic acid, and synthesizing the aluminum ion fluorescent probe by utilizing 7-hydroxycoumarin-8-aldehyde and ortho-aminophenol. The structure of the aluminumion fluorescent probe is represented by a nuclear magnetic spectrum and a mass spectrum; the spectral quality of the fluorescent probe is analyzed through an ultraviolet spectrum and a fluorescent spectrum; the result indicates that the fluorescent probe has high selectivity and is not interfered by other co-existing ions when identifying aluminum ions; and the probe generates coordination interaction with the aluminum ions according to the ratio of 1:1 and the reaction has reversibility. Therefore, the fluorescent probe can be applied to detection on the aluminum ions well.