47 results about "Time resolved spectra" patented technology

An in-situ laser plasma spectroscopy (LPS) system for automated near real-time elemental depth profiling of a target including: an optical source configured to generate an optical beam, wherein the optical beam is pulsed; an optical probe system configured to deliver the optical beam from the optical source to a surface of a target to generate an ablation plasma; a time resolved spectral detection system configured to generate time resolved spectral data from emission signals from the ablation plasma; and a data acquisition and processing system configured to acquire the time resolved spectral data to determine, in combination with predetermined calibration data, an absolute elemental concentration as a function of depth in near real-time.

A time-resolved spectroscopy system employing a time-division multiplexing optical device with no dispersive optical elements to perform lifetime and concentration measurements in multi-species samples, is disclosed. Some examples include fluorescence and cavity ring-down spectroscopy. The system is unique in its compactness and simplicity of operation. In one embodiment, the system makes use of only one photo-detector and an efficient linear regression algorithm. The system offers a measurement time for multiple species measurements of less than 1 s. The system can also be used to perform fluorescence correlation spectroscopy and fluorescence cross-correlation spectroscopy. Four methods to de-convolve a multi-component, exponentially decaying optical signal such as obtained with the system disclosed here, are presented. These methods may be applied to the measurement of fluorescence decay lifetimes and cavity ring-down times, the latter used extensively for the measurement of gas and trace-gas concentrations in complex mixtures, via absorption spectroscopy.

The invention discloses a single-shot multi-information diagnostic target. The diagnostic target is characterized in that a positive plate impacts a substrate at a high speed, and enters a sample through the substrate to conduct shock compression; the shock wave is reflected back and forth between the substrate with high shock impedance and a composite window to compress the sample multiple times so as to generate a high-temperature and high-pressure plasma and send light radiation; the light radiation enters a multi-channel radiation pyrometer and a time-resolved spectrometer through the composite window and a fiber bundle to synchronously measure the shock luminous radiation history and the time-resolved transient spectra; the interface particle velocity of the shock wave changes when the shock wave is reflected between the sample and the window interface; and the particle velocity profile is measured by a Doppler probe system. The state parameters of the sample compressed for multiple times can be determined through correlation analysis of the particle velocity profile and the shock luminous radiation history in combination with the impedance matching method. The diagnostic target has a compact structure, and can achieve the synchronous measurement of multiple state parameters of the plasma in the same single-shot experiment, such as shock wave velocity, particle velocity, pressure, temperature, density and time-resolved transient spectra.

The invention relates to a deep ultraviolet laser photoluminescent spectrometer, which comprises a full solid deep ultraviolet laser, a vacuum sample chamber, a vacuum monochrometer, a first vacuum maintaining system, a second vacuum maintaining system, a low-temperature system, a temperature control device, a sample frame three-dimensional adjusting device, a stable state emission spectrum detection system, a time resolution spectrum detection system, a vacuum leakage safety system and a computer control device, wherein the vacuum sample chamber is connected with the full solid deep ultraviolet laser; the vacuum monochrometer is connected with the vacuum sample chamber; the first vacuum maintaining system is connected with the vacuum sample chamber; the second vacuum maintaining system is connected with the vacuum monochrometer; the low-temperature system and the temperature control device and the vacuum sample chamber are connected by a flange; the sample frame three-dimensional adjusting device is connected with the vacuum sample chamber; the stable state emission spectrum detection system is connected with the vacuum monochrometer; the time resolution spectrum detection system is connected with the vacuum monochrometer; the first control end and the second control end of the vacuum leakage safety system are connected with the first vacuum maintaining system, the third control end and the fourth control end of the vacuum leakage safety system is connected with the second vacuum maintaining system, and the fifth control end of the vacuum leakage safety system is connected with the low-temperature system and the temperature control device; and the computer control device is used for controlling the vacuum leakage safety system, the vacuum monochrometer, the low-temperature system, the temperature control device, the sample frame three-dimensional adjusting device, the stable state emission spectrum detection system and the time resolution spectrum detection system.

The invention relates to co-target X ray space time resolution spectrum method and its instrument. The optical system of the instrument includes two elliptical crystal analyzer and an upper and subjacent channel thin gaps, their position relation accords with the theory of geometry optical of ellipse focus. The method is: the target is placed at the first focus of the ellipse, the thin gap is a the second focus of the ellipse, the spectrum detector is behind of the thin gap, uses the two elliptical crystal analyzers superposed on the first focus to carry on spectrum, the plasma X ray generated by the laser by striking the target penetrates the thin gap and is imaged by the X ray CCD camera and stripe camera after through the elliptical crystal analyzer spectrum, the X ray CCD camera takes the space resolution spectrum, the X ray stripe camera takes the time resolution spectrum. The invention can acquires the space and time resolution spectrums at the same time, and the receiving efficiency and spectrum resolution are upgraded.

The invention provides a complementary-measurement time resolution single-photon spectrum counting imaging system and method. The system consists of an optical portion and an electric portion, the optical portion images light on a spatial light modulator, light is modulated and then emitted to two arm directions to be aligned and split, and the electric portion completes detection, control, calculation and the like. The method includes that invisible light and near infrared single-photon detector linear arrays simultaneously detect spectrums of emergent light of two arms of the spatial light modulator, one arm detects visible light spectrum while the other arm detects near infrared spectrum, complementary measurement, maximum luminous flux and high sensitivity can be realized; picosecond time resolution of a periodic object is realized by means of time amplitude variation or delay gate width counting, and second time resolution of a non-periodic object is realized by means of measurement frame by frame; color video frame sequences of visible light and near infrared light can be obtained simultaneously by means of associated compression sensing algorithm according to matrix complementation, and imaging quality is improved while imaging speed is increased; and time resolution spectrograms are counted up for spectral analysis.

A system, device and/or method for multiplex assays. In a particular, but non-limiting, example there is provided a multiplex array, such as a suspension array. Luminescence decay lifetimes are utilised for probes in a suspension array, and coding/decoding the codes from time-resolved spectra. Lifetime populations can be generated at distinct colour bands. A novel temporal technique or dimension is applied over conventional spectral and intensity combinations, thereby expanding the multiplexing capacity of a suspension array. In one example form, the multiplexing capacity of a suspension array can be expanded to the order of about 58. This provides a reliable, high-throughput and relatively inexpensive solution for multiplex assays in various areas of application such as life sciences, data storage and security.

Provided herein are devices, systems, and methods for characterizing a biological sample in vivo or ex vivo in real-time using time-resolved spectroscopy. A light source generates a light pulse or continuous light wave and excites the biological sample, inducing a responsive fluorescent signal. A demultiplexer splits the signal into spectral bands and a time delay is applied to the spectral bandsso as to capture data with a detector from multiple spectral bands from a single excitation pulse. The biological sample is characterized by analyzing the fluorescence intensity magnitude and/or decayof the spectral bands. The sample may comprise one or more exogenous or endogenous fluorophore. The device may be a two-piece probe with a detachable, disposable distal end. The systems may combine fluorescence spectroscopy with other optical spectroscopy or imaging modalities. The light pulse may be focused at a single focal point or scanned or patterned across an area.

The invention provides a transmission grating spectrometer with high spectral resolution and a wide spectrum measurement range. The transmission grating spectrometer comprises an incident slit, a transmission grating, a streak camera, and a photocathode slit and a photocathode which match the streak camera. X ray emitted by an object passes through the incident slit and is dispersed by the transmission grating to form two spectra different in resolution, the two spectra are dislocated in space, redundant spectrum is blocked when the two spectra pass through the photocathode slit in front of the streak camera, and therefore, X-ray spectra of high space-time resolution and wide range can be obtained on the streak camera. The transmission grating spectrometer of the invention can achieve higher spectral resolution on the basis of ensuring the measured spectral range, is applicable to time-resolved spectrum measurement, and has a wide application prospect in X-ray spectrum precision measurement.

An absorption spectroscopy gauge to measure chemical concentrations in a post-detonation combustion cloud of energetic materials. A broadband light source coupled to an optical fiber guides light into a gauge via a first leg where a plano-convex lens collimates the light source internally. The light reflects off a mirror and passes through an absorption region before entering a second leg of the gauge where it is refocused into a different fiber and sent to a time-resolved spectroscopy system for analysis. The time-resolved spectroscopy system can include a spectrometer and a steak camera. The two legs of the gauge are arranged as separate halves connected by a plurality of rods that can be adjusted to change the length of the absorption region. The gauge is arranged to include stainless steel cone shaped tips to minimize added turbulence brought upon by its use.

A system for time resolved spectroscopy comprises a CCD device arranged to receive a time varying spectrum. Time resolved spectroscopy is the analysis of a spectrum that varies with time due to any cause. The variation with time of the spectrum may be due, for example, to (i) changes of the spectrum from a given sample space with time (such as due to emission decay); and (ii) changes in the spectrum as successive portions of a sample space are sampled (such as laser scanning microscopy). The CCD device comprises an array of photosites arranged to detect the time varying spectrum and to produce signal charge representative of the spectrum, and one or more CCD multiplication registers arranged to receive the signal charge and to provide charge multiplication. An enhancement of speed and sensitivity is given by a storage area which receives the signal charge in parallel from the array of photosites to provide the charge in serial to the one or more multiplication registers.

The invention relates to a super sensitive time resolution spectrograph which comprises an optics unit and an electricity unit. The optics unit comprises an incidence slit, a light collimating part, a concave mirror, a grating light-dividing part, a spatial light modulator and a convergence light-receiving part, the concave mirror comprises a first concave mirror and a second concave mirror, and the electricity unit comprises a random number generator, a single photon point detector, a counter, a time measuring instrument, a control module, a data packet storage and a compression sensing module. To-be-detected quite-weak light incomes through the entrance slit and goes through the light collimating part and the first concave mirror for beam expanding and collimating so as to enable the light to be parallel light, the parallel light is irradiated on the grating light-dividing part, a generated grating reflecting light field is reflected by the second concave mirror to be folded on the spatial light modulator to form a spectrum band, the spatial light modulator randomly modulates the spectrum band to enable emergent light of the spectrum band to be emitted to the convergence light-receiving part at a certain random probability, and the convergence light-receiving part filters stray light and transmits the filtered light to the single photon point detector.

The invention relates to a nanosecond time-resolved absorption and emission spectrum measuring device. An excitation light source is orderly connected with a first sequence pulse generator, a working frequency coordinator, a second sequence pulse generator, and a data collector; the second sequence pulse generator is respectively connected with a light path system and a detection light source; the data collector is respectively connected with the working frequency coordinator, a first light intensity detector, a second light intensity detector, a third light intensity detector, and a monochromator; the light path system and a sample cell are also disposed between the detection light source and the monochromator. The measuring method comprises: setting the temperature of a sample, irradiating the sample by light beams emitted by the excitation light source to reach an electron excitation state, obtaining zero point time of time-resolved spectrum data by part of the light beams; after pulsed white light emitted by the detection light source passes through the sample, feeding back detection light intensity signals to the data collector, and converting the signals into absorption and emission spectra. The measuring device of the invention is equipped with a temperature controllable sample cell, and obtains spectrum data with a high signal to noise ratio.

Methods and systems for inspection of an object include the use of spectroscopic techniques for the detection of unwanted particles on an object's surface, based on the different responses of the unwanted particles as compared with the object to be inspected due to their different materials. Time resolved spectroscopy and/or energy resolved spectroscopy of secondary photon emission from the surface of the object can be used to obtain Raman and photoluminescence spectra. The objects to be inspected can for example be a patterning device as used in a lithographic process, for example a reticle, in which case the presence of metal, metal oxide or organic particles can be detected, for example. The methods and apparatus are highly sensitive, for example, being able to detect small particles (sub 100 nm, particularly sub 50 nm) on the patterned side of an EUV reticle.

The invention provides a method for measuring transmission speed of an electrical signal in a metal wire by using a femtosecond laser time resolution spectrum and an implementing device. The method is used for measuring the transmission speed of the electrical signal in the wire based on time resolution of the transient process and has the powerful advantages of being high in data collecting speed and working efficiency and small in measurement error. Concretely, the time resolution spectrum method is used for making the resolution ratio reach the ps magnitude and be close to self shake, and then the own error of measurement is greatly reduced; time delay of the ps magnitude and the us magnitude can be obtained by adopting an electrical signal and optical pulse signal synchronization method, the data collecting speed is high, and therefore the working efficiency is greatly improved; based on the measurement of the time resolution spectrum, depending on the ultrafast exposure time of a transient spectrograph, the process from opening to closing a shutter can reach 2 ns to the minimum, the ultrafine delay adjusting function is additionally combined, and therefore the measurement accuracy can reach the tens of ps magnitudes.

The invention discloses infrared spectrum high-speed measurement system and method, and belongs to the field of infrared spectrum analysis. The measurement system comprises an optical frequency comb source module, an optical module, a detection and data collection module, a data processing module and a control module. The method has a very wide spectral measurement range, wherein measurement timeand spectral resolution are both considered, and the application requirement of time resolution spectral analysis can be satisfied; time-resolved spectral measurement of a terahertz waveband can be realized by replacing an optical frequency comb source of terahertz working waveband, an optical path device, a detector and the like; spectral light splitting is realized without moving parts or tuningprocessing and other means; an optical spectrum scanning mode of a double-frequency comb beat frequency mode is directly adopted, ultra-high resolution spectrum information of a full waveband can beobtained at a time, the advantage of ultra-high measurement speed is achieved, and the measurement speed of a spectrum analysis system adopting the technology is mainly influenced by an electronic detection link and the like.

The invention relates to a light pulse technology, in particular to a method and a device for generating a light pulse through graphene oxide electron transfer driven by an electric field, and solves the technical problem that a conventional light pulse generating device cannot generate the light pulse on the rising edge and the falling edge where the electric field controls a square signal. The method for generating the light pulse through the graphene oxide electron transfer driven by the electric field comprises the steps as follows: (a), voltage which is modulated by the square signal is loaded at two ends of a prepared oxidized grapheme sample, and the highest electric field intensity of the voltage ranges from 150 V/mm to 400 V/mm; (b), continuous laser is adopted to focus on the surface of the oxidized grapheme sample; and (c), a fluorescence pulse which has the intensity increasing suddenly along the falling edge of an external modulating square wave or along the rising edge and the falling edge simultaneously is obtained. According to the method and the device for generating the light pulse through the graphene oxide electron transfer driven by the electric field, a light pulse signal which is enhanced suddenly along the falling edge and the rising edge of the external modulating signal is obtained, and the method and the device can be widely applied to the fields of time resolution light spectrum, three-dimensional optical imaging, optical information processing and the like.

A microscope comprising: a light sampler for collecting light from a measurement area of a sample; a multi-element detector having a plurality of photoelectric elements, for detecting the light collected by the light sampler, each photoelectric element corresponding to a minute measurement region in the measurement area with one-to-one correspondence; a Fourier transform spectrophotometer as a spectroscope; a data sampler for concurrently sampling intensity data sent from each photoelectric element of the multi-element detector at a timing determined by the Fourier transform spectrophotometer; and a data processor for obtaining time-resolved spectrum data for each minute measurement region according to temporally changed interference light data obtained by the data sampler.

The invention provides a device and a method for inhibiting fluorescence in a Raman spectrum device based on double Kerr optical switches. The device comprises a laser light source, a first spectroscope, a focusing lens, a to-be-tested sample, a signal light convergence lens, a second spectroscope, a first light delayer, a first Kerr optical switch, a reflector, a second light delayer, a second Kerr optical switch, a narrow-band band-pass filter, and a detector. Interference optical signals such as long-life fluorescence can be filtered by respectively controlling the delay time of the first optical delayer and the second optical delayer and the position of the Kerr optical switch, so that the detector only receives optical signals within a specific pulse width or time period to increase the signal-to-noise ratio of the Raman spectrometer, and also can also be used for detecting transient or ultrafast optical signals in a short time range in a time-resolved spectrum detection technology and a time-resolved spectrum detection device.

The invention discloses a method for shortening a pulse and obtaining an adjustable picosecond pulse, which comprises the steps of firstly modulating a pumping source to generate an optical pulse or an electric pulse to excite a gain switch type semiconductor laser, generating pulse laser with a chirp pulse component and a steady-state pulse component, then leading the pulse laser to a filter element through a light path, and obtaining short wave laser or long wave laser after filtering treatment, wherein the short wave laser is from the initial pulse component, has extremely short pulse widthcan achieve the purpose of shortening the pulse, and the filtering parameters are adjusted to change the wavelength and the pulse width of the short wave pulse laser so as to achieve pulse adjustment. The method can be applied to a single-mode gain switch semiconductor laser. Compared with common methods such as chirp compensation and pulse compression, the method has the advantages of simplicity, high feasibility and low cost, can conveniently obtain the adjustable picosecond pulse with high spectral purity, narrow optical pulse width and weak pulse jitter, combines the technologies such asoptical amplification and wavelength transfer, and can be applied to many fields such as multiphoton imaging and time resolution spectrum.