36 results about "Excited molecule" patented technology

A method of high spatial resolution imaging a structure in a sample comprises: marking the structure with molecules of a fluorescent dye; selecting a first wavelength for excitation light which excites the molecules of the fluorescent dye via a multi photon process for spontaneous emission of fluorescent light; focussing pulses of the excitation light into the sample to excite those molecules of the fluorescent dye present in a focal area of the focussed excitation light; selecting a second wavelength shorter than the first wavelength for de-excitation light which de-excites excited molecules of the fluorescent dye prior to their spontaneous emission; during a plurality of the pulses of the excitation light, continuously directing the de-excitation light onto the sample to de-excite excited molecules of the fluorescent dye, which are located outside an measurement area which is a fraction of the focal area; and recording the fluorescent light spontaneously emitted by the molecules of the fluorescent dye in the sample.

A material detector includes a pulse generator to generate pulses to excite molecules in the material and a detector to detect a signal generated from excited molecules in the terahertz region. Spectral features in the material are analyzed to identify the material. Detection can be performed using a nanoantenna array structure having antennas tuned to detect the expected spectral emission. The nanoantenna array can include antennas having MIM or MIIM diodes. Signal processing and statistical analysis is use to reduce false positives and false negative in identifying the material.

An apparatus and method for extracting energy is provided. In one aspect the method includes using chemical reactions to generate vibrationally excited molecules, such as high-quantum-number-vibrationally-excited gas molecules in a region. The vibration energy in the vibrationally excited molecules is converted into hot electrons when the excited molecules contact a conductor. A geometry is provided so that the excited molecules may travel, diffuse or wander into a conductor before loosing a useful fraction of the vibrational energy. Optionally, the generating and the converting process may be thermally separated, at least in part. The short lived hot electrons are converted into longer lived entities such as carriers and potentials in a semiconductor, where the energy is converted into a useful form.

The invention relates to the spectral measurement field and discloses a Raman enhanced measurement device. The Raman enhanced measurement device comprises a laser, a collimating system, an off-axis integral cavity, an edge filter, a light receiving lens, a spectrometer and a control system, which are arranged sequentially, wherein the off-axis integral cavity comprises a front plane-concave lens and a rear plane-concave lens, the concave surfaces of the lenses face the cavity, and a tested sample is contained in the cavity; the front plane-concave lens is coated with a total reflection film, a light hole is formed in a place deviated from a central shaft, and the rear plane-concave lens is coated with a laser high-reflection edge filter film. The invention also discloses a Raman enhanced measurement method using the Raman enhanced measurement device and an off-axis integral cavity structure applied to Raman enhanced measurement. The off-axis integral cavity technology is adopted to enable laser to be oscillated back and forth in the cavity for multiple times, the number of excited molecules is greatly increased, the Raman spectrum enhancement is realized, and thus the gas or liquid sample with low molecular concentration also can generate strong Raman spectrum; the composition and the concentration of the tested sample can be simply and accurately judged through analysis of Raman spectrum peaks.

The present invention provides an optical detection system comprising an illumination unit and a detection unit. The illumination unit comprises two laser beams of two different wavelengths. One beam is used to excite targeted molecules in a sample to their excited states. The other beam is used to induce the excited molecules in the sample to generate a stimulated emission signal. The stimulated emission signal can be used for long-distance detection due to its coherent property. Its extraction from the detection unit can be realized by demodulating the second beam's intensity change.

A sample sensor (200) for detecting a concentration of a sample in a sample mixture, the sample sensor (200) comprising a light source (101), a detector element, a processing section (106) and parameter measuring means. The light source (101) produces a light beam (113) for exciting molecules of the sample. The detector element detects an 5 amount of excited molecules of the sample and provides a detector current indicating the amount. The processing section (106) is coupled to the detector element (103) for processing the detector current to generate an output signal (109) representing the concentration. The processing section (106) comprises a temperature compensation module (112) being arranged for compensating for a temperature dependent wavelength shift of the light source (101) 10 based on at least one measured value of a temperature dependent parameter of the light source (101), other than an output wavelength. The parameter measuring means obtain the at least one measured value.

Various embodiments of the present invention provide a method of detecting inaccessible radiation sources by measuring corresponding ions and excited molecules created by radiation, using LIDAR technology. The LIDAR system of the present invention employs a pulsed laser transmitter, a telescope receiver, and associated control and acquisition systems. Light propagates out from the laser transmitted and is directed into the volume surrounding the radioactive source, or the “ion cloud.” The ion cloud absorbs the transmitted light, which induces the non-fluorescing ions to fluoresce. Light from the ion cloud is then backscattered and the telescope receiver subsequently collects the photons from the backscattered light. The intensity of the fluorescence (determined by the photon count) is measured, which provides an indication of the number density of the ionized atoms. Algorithms can then be used to relate the measured ionization rates to the source activity.

The invention discloses a method for online measurement of concentration of OH free radicals in a flame zone of Class B fire and a flame device. The method adopts the technology of laser-induced fluorescence to make a laser beam with the absorption wavelength of 308nm tuned to OH irradiate OH free radicals in a flame zone, so as to generate resonant transition from a low electronic state to a high electronic state. The excited molecules then self-radiate fluorescent. Under the condition that laser intensity and instrument conditions are maintained unchanged, the total fluorescence intensity is proportional to the concentration of the OH free radicals, thereby obtaining the concentration of the OH free radicals. The device of the invention comprises a pear-shaped funnel (1), a square combustion device (3), an oil cup (5), a mist rising control tube (6), a bracket (7) and a humidifier (8). The invention has the advantages of high measurement accuracy, simple structure and easy implementation.

A method is disclosed for analyzing particles or biomolecules in a liquid sample, including: detecting a signal and fluctuations in the signal from a detection volume in the sample; wherein the signal is generated from signal-generating molecules in the medium surrounding the particles or biomolecules and the fluctuations are transient reductions in the signal as the particles or biomolecules transit through the detection volume; and analyzing the detected fluctuations to obtain information about the particles or biomolecules in the liquid sample. At least one example embodiment of the present invention relates to a fluorescence correlation spectroscopy system including a laser, a zero-mode waveguide, guiding device for guiding the laser into the zero-mode waveguide, device for collecting fluorescence emission from excited molecules within the waveguide, a detector for detecting the fluorescence emission and means for autocorrelating the detected fluorescence signal, wherein the detector comprises a photomultiplier tube. Moreover, at least one embodiment relates to the use of a fluorescence correlation spectroscopy system for analyzing molecules of interest in a sample by detecting and analyzing fluctuations in a fluorescence signal that is generated from sample molecules surrounding the molecules of interest, wherein the fluctuations are transient reductions in the detected fluorescence signal.

In a fluorescence-microscopic method of examining a sample with high spatial resolution, the sample is first cooled to a temperature of below 5° C.; next the cooled sample is transferred out of a ground state into a fluorescent state within an area captured by a detector using an excitation beam of light; next the cooled sample is subject to de-excitation of excited molecules by stimulated emission in the area captured by the detector, except at desired measuring points, using an de-exciting beam of light, the de-exciting beam of light having a spatial intensity distribution comprising a zero point located at the desired measuring points, and the excited sample being transferred back into its ground state by the de-exciting beam of light; and then fluorescence light spontaneously emitted by the cooled sample is measured with the detector, the detector detecting fluorescence light that is emitted only from the measuring points.

A sensor device which is adapted for detecting target molecules having a target nucleic acid sequence located in nano/micro channels, comprises a THz source for exciting the target molecules and a heterodyne interferometer, having a detection frequency MHz, for probing the excited molecules. The nano-channel array in the sample holder is functionalized with electric field to linearize the target alleles and genes. The linearized molecules are exposed to THz field whereby the different vibrational modes of base pairs are resonantly excited. The excitation of base-breathing mode and base-shifting mode leads to differential induced dipole moments along and perpendicular to the double helix axis. This induced asymmetry in polarizability leads to optical anisotropy. The dipole-dipole interaction between adjacent bases affects polarizability along the helix axis and hence the intrinsic molecular anisotropy is a function of number of base pairs in the strand. The resulting birefringence can be measured using the heterodyne interferometer as a function of changes in the number of base pairs in the strand. Furthermore, a sensing method for detecting birefringence in terms of phase shift of the MHz signal, as a function of target molecule size, is described.

A flame photometric detector comprises a burner assembly configured to combust a sample of an effluent, the combusted sample emitting at least one excited molecule, an interchangeable selective optical filter configured to pass a plurality of selected optical wavelengths corresponding to the excited molecule, and a photomultiplier tube configured to quantify the concentration of the excited molecule.

The invention discloses a commercial vehicle recycled modified fender material and a preparation method thereof. The material is prepared from, by weight, 30%-58% of polypropylene reclaimed materials, 20%-40% of reclaimed toughening agent, 20%-30% of mineral powder, 0.1%-0.5% of antioxidant, 0.1%-0.5% parts of light stabilizer and 0.1%-0.5% of ultraviolet absorbent. According to the commercial vehicle recycled modified fender material and the preparation method thereof, the polypropylene reclaimed materials and waste film materials serve as raw materials for preparation, and the current reuse problem of the waste materials is well solved; meanwhile, the production cost of the fender is saved, the reclaimed materials are subjected to purification, cleaning, drying, homogenization and regeneration, and the stable use performance is achieved. A hindered amine light stabilizer is adopted, a light and oxygen degradation reaction is inhibited through various paths of capturing free radicals, resolving hydroperoxide, delivering excited molecule energy and the like; a benzotriazole ultraviolet absorbent and the hindered amine light stabilizer are used together, the synergistic effect is achieved, and the anti-aging capacity of the material can be improved by 2-4 times.

The invention relates to a method for generating phosphorescence in an organic compound. The organic compound must have a donor function group and a receptor function group, donor atoms have SP<3> hybrid characteristics, and receptor atoms have SP<2> hybrid characteristics. The donor atoms lose electrons in an SP<3> hybrid state and transfer the electrons in the SP<3> hybrid state to partially positively charged receptor atoms in an SP<2> hybrid state in order to make a molecule be in an excited triplet state, and the excited molecule is resonated to make the receptor atoms become the SP<3> hybrid state from the SP<2> hybrid state in order to make an original donor become a receptor and an original receptor become a donor; and the donor atoms, which are receptor atoms in a ground state, lose the electrons in an SP<3> hybrid state and transfer the electrons in the SP<3> hybrid state to the receptor atoms in the SP<2> hybrid state, and orbit-spin coupling is carried out again to make the molecule return to the ground state in order to generate phosphorescence. An organic phosphorescence generation mechanism is explicated in the invention for the first time, and scientific research personnel can easily synthesize organic molecules in a liquid or solid state and with visible phosphorescence in room temperature air under the guidance of the mechanism.