237 results about "Grating spectrometer" patented technology

The present invention discloses one kind of spectral-domain optical coherent tomography endoscopic image system for in vivo optical biopsy, and the system includes one fiber optical interferometer, one imaging probe, one detection unit, one image acquiring card and one computer. The detection unit has grating spectrograph for high imaging speed, and the imaging probe has axial axicon lens and inside rotating right angle prism or circularly symmetric beam splitter combined to ensure high transverse resolution in the whole depth range, so as to realize circularly scanning endoscopic imaging. The present invention proposes two embodiments of circularly scanning probe and their corresponding system structures. The present invention may be applied in the optical endoscopic biopsy and analytic study of oral cavity, respiratory tract, gastrointestinal tract, etc.

The invention discloses a high resolution micro infrared spectrometer based on an MEMS scanning micromirror. The high resolution micro infrared spectrometer comprises a fiber connecting device, an incident slit, a collimation reflector, a scanning micromirror, a blazed grating, a spherical surface focusing reflectors, an emitting slit and a high sensitivity unit infrared detector. A novel optical path structure is employed by the high resolution micro infrared spectrometer: an external optical signal to be measured is coupled into a spectrometer through the fiber and the slit and collimated by the spherical surface collimation reflector; the MEMS scanning micromirror and a diffraction grating are utilized to substitute a scanning raster in a traditional scanning raster spectrometer to realize optical splitting and spectrum scanning functions together; during torsional pendulum of the micromirror surface, a combination of two spherical surface reflectors carries out focusing and imaging on the spectrum, so that light with different wavelengths is focused and imaged and irradiates on the detector through the emitting slit successively to realize continuous detection of spectrum. The spectrometer based on the MEMS scanning micromirror provided by the invention has advantages of small volume, wide spectrum measurement scope, high resolution and low cost, etc.

The invention belongs to the technical field of laser probing, in particular to a laser probe micro-area component analyzer based on a double laser light source. The laser probe micro-area component analyzer comprises a fixed wavelength laser device, an attenuator, a beam expanding mirror and an aperture diaphragm; first semi-permeable half-mirrors are arranged on the same horizontal light path according to the structure; after a wavelength tunable laser device is reflected onto the first semi-permeable half-mirrors by a second totally reflecting mirror, the wavelength tunable laser device has the same light path with the laser beam of the fixed wavelength laser device; the fixed wavelength laser device and the wavelength tunable laser device can be arranged up and down or in parallel, and the starting sequence and the time delay thereof can be controlled by a digital delay generator; a fibre-optical probe receives laser, then the laser is transmitted to a grating spectrometer by the optical fibre, and the acquisition time of a plasma spectra reaching enhancement mode CCD is controlled by the digital delay generator. The laser probe machine stimulated by the double laser light sources has low detection limit, high element analysis precision and favourable element selectivity, is reliable and safe, and can be used for accurately determining the nature of microelements and trace elements of the micro-areas of various substances as well as carrying out accurate quantitative analysis.

The invention relates to a device for carrying out the nondestructive optical constant imaging of a human body cutis pathologic tissue and a method thereof. The device comprises a tungsten halogen lamp, an incident fiber optic probe, a line array CCD for receiving diffused reflection light, and a grating spectrograph, an amplification filter circuit, an A/D conversion circuit, a computer and a computer-controlled three-dimensional traveling table which are connected in turn through an optical fiber. The invention uses the line array CCD optical measurement device detecting the obliquely incident diffused reflection light to detect the human body cutis tissue, uses a Monte Carlo statistical method limited by characteristic parameters to conversely compute the values of the absorption coefficient and the reduction scattering coefficient at each two-dimensional space coordinates of the detected cutis tissue, then uses the grating spectrograph to carry out spectrum, and respectively images through the absorption coefficient and the reduction scattering coefficient and simultaneously detects the detected human body pathologic tissue and a healthful tissue around the pathologic tissue. Then the optical constants of the pathologic tissue and the healthful tissue are compared to see difference or the optical constant of the pathologic tissue is compared with a healthful human body tissue sample, thereby carrying out the diagnosis and identification of diseases.

The invention relates to a two-slit interference fringe decoding spectrum confocal displacement sensor and a displacement measurement method thereof. A grating spectrometer is used in a spectrum analyzing unit of a current spectrum confocal displacement sensor, the beam split principle is complex, cost is high, detected wavelength can drift along with time and environment, and the measuring accuracy of the sensor is affected. The sensor comprises a broadband point light source, a non-aberration spectroscope, a dispersing lens group, a confocal pinhole, a non-aberration collimating lens, an interference two-slit screen, an adaptive lens, a rectangular diaphragm and a linear array CCD. Reflected light of the surface of a measured object is subjected to filtering through the confocal pinhole, then quasi-monochromatic light is formed, after non-aberration collimating, the quasi-monochromatic light is divided into two sub column face light sources by two slits, interference is formed, the widths of the interference fringes and the wavelength of the reflected light of the surface of the measured object are in good linear relation, and by interpreting the widths of the interference fringes, measuring of object displacement is achieved. The displacement sensor and the method have the advantages of being low in cost, good in linearity and high in resolution ratio, and meanwhile an instrument is simple in structure and easy to machine.

Present refers to a portable liquid chromatograph. It contains injector pump, sampling valve, optical fiber type ultraviolet-visible absorbing/fluorescence two-purpose flow-through cell and optical fiber assembly, capillary integral post, grating spectrograph, photodiode light source, computer, waste liquid bottle and power supply.

A wavelength division multiplexed device is based on a transmission grating spectrometer having at least two diffractive optical elements. The WDM device provides flexible use and may be widely applied in WDM systems. The device is useful for multiplexing and demultiplexing, channel monitoring, for adding and dropping channels, and for controlling the power in individual channels within a multiple channel signal. The device provides for dynamic control of individual channels, and may be advantageous in use as a gain flattening filter.

The present invention discloses a system comprising a compact curved grating (CCG) and its associated compact curved grating spectrometer (CCGS) module and a method for making the same. The system is capable of achieving very small (resolution vs. size) RS factor. In the invention, the location of entrance slit and detector can be adjusted in order to have the best performance for a particular design goal. The initial groove spacing is calculated using a prescribed formula dependent on operation wavelength. The location of the grooves is calculated based on two conditions: the first one being that the path-difference between adjacent grooves should be an integral multiple of the wavelength in the medium and the second one being specific for a particular design goal of a curved-grating spectrometer. In an embodiment, elliptical mirrors each with focal points at the slit and detector are used for each groove to obtain aberration-free curved mirrors.

The invention discloses a spectral automatic calibration device and a method of an imaging spectrometer, and the spectral automatic calibration device can automatically adjust the strength of a light source and set the starting wavelength, the end wavelength and the scanning step length, and has the self-correction function and has the function of automatically acquiring an infrared wave band spectral curve. The spectral automatic calibration device comprises a calibration light source, a grating spectrometer, a control circuit, a data acquisition electronics system and computer control and drawing software.

The invention discloses a grating spectrometer capable of realizing spectral super-resolution reduction, and relates to the field of spectral measurement. The grating spectrometer structurally comprises an incident slit, a diaphragm, a collimating reflector, a diffraction grating, a converging reflector, a linear array detector, a piezoelectric ceramic driving platform, a piezoelectric ceramic controller and a data processing system, wherein light to be detected enters the incident slit, is reflected to the diffraction grating through the collimating reflector, and is focused to form a spectral image on a pixel array of the linear array detector through the converging reflector after being split by the diffraction grating; the linear array detector is fixedly arranged on the piezoelectric ceramic driving platform; the piezoelectric ceramic driving platform is controlled by the piezoelectric ceramic controller to be slightly displaced in a dispersion direction to finish measurement once until the piezoelectric ceramic driving platform is displaced for N+1 times; data obtained in the first N times is processed by the data processing system to obtain spectral data by spectral super-resolution reduction. The grating spectrometer is simple in structure; all the parts except the one-dimensional piezoelectric ceramic driving platform are fixed, so that high spectral resolution can be achieved within a wide spectral range.

The present application discloses a system comprising a compact curved grating (CCG) and its associated compact curved grating spectrometer (CCGS) or compact curved grating wavelength multiplexer/demultiplexer (WMDM) module and a method for making the same. The system is capable of achieving a very small (resolution vs. size) RS factor. In the invention, the location of the entrance slit and detector can be adjusted in order to have the best performance for a particular design goal. The initial groove spacing is calculated using a prescribed formula dependent on operation wavelength. The location of the grooves is calculated based on two conditions. The first one being that the path-difference between adjacent grooves should be an integral multiple of the wavelength in the medium to achieve aberration-free grating focusing at the detector or output slit (or output waveguide) even with large beam diffraction angle from the entrance slit or input slit (or input waveguide). The second one being specific for a particular design goal of a curved-grating spectrometer. In an embodiment, elliptical mirrors each with focal points at the slit and detector are used for each groove to obtain aberration-free curved mirrors.

The present invention relates to a grating spectrograph. Said spectrograph successively includes the following components: a light source, a collimating lens, a grating, a focusing lens, an aspheral lens, digital micromirror equipment, a colour wheel, a projection lens and a display screen. Said invention also provides the concrete function of every component and its working principle.

Multi-ordered spectral data is obtained from various known substances and is stored in a spectral library. The identification of an unknown material is accomplished by correlating the sample's multi-ordered spectrum against all or a portion of the spectrum in the library, and finding the closest match.

The invention discloses a microscopic confocal Raman spectrometer, comprising a microscopic confocal Raman module and a single-grating spectrometer which is matched with the microscopic confocal Raman module, wherein the microscopic confocal Raman module comprises a reflecting mirror, an angle-adjustable optical filter bracket, a sample monitoring optical path, a Raman optical filter, a microscopic objective lens, a collecting lens and a size-adjustable pinhole. Laser is focused to a sample by using the microscopic confocal Raman module, so that the sample and the corresponding laser spots are observed microscopically, and a Raman signal is microscopically confocal to the size-adjustable pinhole simultaneously, therefore the Raman signal is detected by using the single-grating spectrometer. The invention provides a novel microscopic confocal Raman spectrometer with the characteristics of simpleness, economy and convenience for adjustment, so that the microscopic observation of the sample and the corresponding laser spots can be achieved, besides, the microscopic confocal Raman spectrometer plays a potential role on Raman spectrum measurement of materials.

The invention discloses a micro-domain laser probe component analyzer based on optical fiber waveguide. The analyzer comprises a Nd:YAG laser, a wavelength-tunable laser, a CCD monitoring camera, a computer, a grating spectrometer, a focusing objective lens, a displacement platform, a digital delay pulse generator, and an enhanced CCD. The focusing lens is a reflective focusing lens. The Nd:YAG laser and the wavelength-tunable laser both adopt optical fiber waveguide for carrying out laser pulse transmission; laser pulse is collimated by using an optical fiber collimator and expanded by a beam expander, and enters the focusing objective lens. Laser pulse transmitted by the Nd:YAG laser burns a surface micro-domain on a sample to be analyzed, such that plasma is formed; the laser pulse transmitted by the wavelength-tunable laser is applied on the plasma, such that resonance excitation is caused; one end of the optical fiber is used for collecting spectral signal transmitted by the plasma, and the other end is connected with an optical fiber interface of the grating spectrometer. According to the invention, precise qualitative and quantitative analysis of laser probe upon substance micro-domain components can be realized.

The invention relates to an optical racemization and slit scanning integrated device based on a solar telescope grating spectrometer. The optical racemization and slit scanning integrated device comprises a solar telescope (1), a K1 plane mirror (2), a K2 plane mirror (3), a K3 plane mirror (4), an electrical control translation stage (5), an electrical control rotating platform (6), a grating spectrometer slit (7), a grating spectrometer (8), a photoelectric detector (9), a controller (10) and a data processing and control computer (11). At present, most of solar telescopes use horizontal type rack structures, image field rotation problems are easily caused in the object tracking process by means of the structures, so that on one hand, a special image field racemization device is required to be equipped, and on the other hand, a special slit scanning device is required to be equipped to obtain three-dimensional information of a solar activity region. The optical racemization and slit scanning integrated device is simple in structure, small in occupied space, few in optical mirror planes and high in innovativeness and practicality.

The invention discloses a laser induced single droplet breakdown detection method and a laser induced single droplet breakdown detection device. The structure of the device is as shown in attached drawings. During operation, a liquid sample is injected into a capillary tube through a micro syringe; air or specified gas is injected into a pneumatic chamber through a micro air pump; the liquid sample in the capillary tube is pushed to eject out of the capillary tube; droplets axially move along a tube column of the capillary tube under the airflow function of a guide exhaust port; when continuous light beams transmitted by a low-power continuous laser are blocked by the droplets, a photoelectric detector triggers an auxiliary control circuit to generate a time delay signal. Laser pulse transmitted by a pulsed laser is focused through a focusing lens group to break down the droplet sample; a light radiation signal is coupled into an optical fiber through a collecting lens group, split by a grating spectrometer and detected by a detector, and a spectral signal is displayed, stored and processed by a computer. The device can be applied to the field of application of high-precision component detection in the fields of chemical industry, foods and medicines and also can be applied to the field of basic research in the field of scientific research.

The invention provides a spectral resolution enhancement method based on Fabry-Perot cavity scanning filtering. A Fabry-Perot cavity scanning filter is added to a grating spectrometer optical path, the length of the cavity of the filter can be modulated, and the modulation range is half of the maximum wavelength of signal light to be detected; when the Fabry-Perot cavity scanning filter is in the initial cavity length, only part of spectral lines in the signal light are filtered out; the part of the spectral lines which are filtered out can be distinguished and acquired by a linear array detector; the length of the Fabry-Perot cavity is changed by using a driver and the other part of the spectral lines in the signal light are filtered out; the other part of the spectral lines which are filtered out can also be distinguished and acquired by the linear array detector; all parts of spectrums acquired under the condition of different cavity lengths are synthesized to achieve spectrum splicing of the wide spectrum range; and an enveloping surface obtained after the spectrum splicing is the detected spectrogram of the signal light. By means of the spectral resolution enhancement method, the spectrum resolution of a grating spectrometer can be effectively improved while the free spectrum range of the grating spectrometer is guaranteed.

The invention relates to a raman spectrometer, which can be used for accurately qualitatively and half quantitatively analyzing a sample. The raman spectrometer comprises a laser, a raman signal acquisition device, a transmittance-type grating spectrometer, a plasma filter plate, a laser attenuation plate and a soleplate, wherein all the parts are fixed on the soleplate. The laser, the raman signal acquisition device and the transmittance-type grating spectrometer are fixed on a floor, and the raman spectrometer adopts transmittance-type coaxial optical-path design, so that the confocal measurement can be realized. The raman spectrometer has advantages of high light throughput, good spectral resolution, good stability and the like. The raman spectrometer is applicable to various excitation light sources of ultraviolet light, visible light, near-infrared light and the like.

The invention discloses a micro-region fluorescent scanning measurement system which comprises an exciting light source, an excitation light path part, a fluorescence signal collection light path part, a micro-region imaging light path part, a table-board, a two-dimensional electric translation system, a vacuum sample chamber, a vacuum pump, a low-temperature system and temperature control device, a grating spectrometer and a CCD detector, wherein the input end of the excitation light path part is connected with the exciting light source, and the output end of the excitation light path part is connected with the vacuum sample chamber; the excitation light path part is used for guiding laser to income into a sample in the vacuum sample chamber; the fluorescence signal collection light path part is used for collecting a fluorescence signal emitted from the sample; the micro-region imaging light path part is connected with the excitation light path and the fluorescence signal collection light path and is used for micro-region imaging and positioning of the sample surface topography; the excitation light path and the fluorescence signal collection light path part are arranged on the table-board; the two-dimensional electric translation system drives the table-board to do a two-dimensional scanning motion; the vacuum sample chamber is used for placing the sample; the vacuum pump is used for maintaining the vacuum degree of the vacuum sample chamber; according to the low-temperature system and temperature control device, the vacuum degree of the vacuum sample is maintained, and the sample chamber is maintained in a needed low temperature environment; the grating spectrometer is used for processing the fluorescence signal; and the CCD detector is used for acquiring the fluorescence signal.

The invention combines fluorescent QDs and methods to dispense and detect them efficiently in a compact volume for a range of optical tagging applications. Micro-fluidic devices are used for mixing water-soluble fluorescent QDs in aqueous solutions to create a multi color fluorescent nano-optical tag, and gratings are used for spreading the spectral components of the fluorescent signal leading to an improvement in optical data storage capacity over prior art methods. The spectral signature of the tag is detected by a compact read-out head with a grating spectrometer. One way is to dispense the tag within the pits of a DVD or CD using an ink-jet nozzle and exciting them by a large range of wavelengths each shorter that the emission peak. The filters have a high immunity to prolonged exposure to high temperatures, and up to 41 infrared filters can be holographically recorded by spatial multiplexing of the substrate.

The invention discloses a near infrared weak pulse spectral radiance calibration device which belongs to the technical field of optical metrology. The device comprises a light source component which is used for grating spectrometer calibration, an optical fiber component with an array optical fiber bundle, a computer provided with a spectral radiance calibration data processing software package and a grating spectrometer with a flat field concave surface grating and a surface array EMCCD. The input end of the array optical fiber bundle is a single optical fiber, and the output end comprises n optical fibers in line arrangement. A pulse light beam emitted by a measured pulse light source passes through the optical fiber component and a slit, and is dispersed by the flat field concave surface grating. Dispersed lights are focused onto the photosensitive surface of the surface array EMCCD to form n rows of line spectrum. The computer collects n rows of line spectrum, acquires the spectral radiance value of the measured pulse light source changing with wavelength according to a spectral radiance calculation formula, and shows a single width or multi width spectral radiance curve on a computer screen. The device provided by the invention solves the problem of difficult calibration of the spectral radiance of a near infrared weak pulse light source, and has a broad application prospect.

The invention discloses a laser radar based water-in-cloud raman scattering full-spectrum measurement system. The system comprises a laser emitting device, a laser receiving device, a spectrum resolution device, a photoelectric detection device, a data collecting device and a double-pulse triggering device, wherein the laser emitting device comprises a laser, a beam expander and a reflector, the spectrum resolution device comprises an optical fiber, an aspherical mirror, a broad bandpass filter, a grating spectrometer and a rotating platform, the photoelectric detection device comprises a photomultiplier which converts optical signals into electric signals, the data collecting device comprises a photon counting card and a computer, and the double-pulse triggering device comprises a sensing triggering module, a single chip microcomputer and a gating device. Simultaneously, the invention discloses a laser radar based water-in-cloud raman scattering full-spectrum measurement method. According to the system and the method, solid water and liquid water in clouds serve as detection objects, the whole system is compact in structure, easy to control and regulate and high in stability.