338results about "Absorption/flicker/reflection spectroscopy" patented technology

The invention provides a precise and small broadband hyperspectral imager, which is used for solving the technical problem that the existing broadband spectral imager from visible near-infrared to short-wave infrared for sceneries cannot meet the increasingly harsh imaging requirements. According to the small broadband hyperspectral imager, the front optical assembly of an off-axis two-reflection structure and the spectrometer assembly in a free-form surface reflector, optical path multiplexing and axis folding mode are adopted, the number of used lenses is greatly reduced, meanwhile, the length of a spectrometer is effectively reduced, and the imaging precision is improved. The volume and the weight of the spectral imager are greatly reduced; besides, front surfaces and rear surfaces of a first lens and a second lens in the spectrometer assembly are plated with broadband antireflection films from visible near-infrared to short-wave infrared according to light angles, and broadband detection from visible near-infrared to short-wave infrared can be realized in combination with a broadband refrigeration type detector. And the complexity and the installation and adjustment difficulty of the detector assembly and the circuit assembly are greatly reduced.

A gas absorption spectrometer is a gas absorption spectrometer that measures sample gas, and includes a resonator 100A including at least two mirrors, a laser light source that emits laser beams for irradiation of the resonator 100A, and a photodetector that detects light taken out of the resonator. The resonator includes an inner chamber 1A where mirrors 21 and 22 are accommodated, the inner chamber defining a measurement space 15 where sample gas is to be introduced, an outer chamber 3 arranged outside inner chamber 1A for vacuum insulation of the measurement space 15 from the outside, and a cooler 9 arranged within the outer chamber 3 at a distance from the inner chamber 1A, the cooler including an internal space where coolant flows.

The invention discloses a MoTe2 / Bi < 0.5 > Sb < 1.5 > Te3 heterojunction thin film and application thereof in broadband near-infrared photoelectric detection. The heterojunction thin film is formed by stacking a MoTe2 thin film prepared by magnetron sputtering and a Bi < 0.5 > Sb < 1.5 > Te3 thin film prepared by magnetron sputtering, and the MoTe2 thin film and the Bi < 0.5 > Sb < 1.5 > Te3 thin film are in direct contact to form a heterojunction interface; the preparation method comprises the following steps: putting a cleaned n-Si substrate into a magnetron sputtering instrument, sputtering a MoTe2 film in an inert atmosphere, and carrying out annealing treatment to obtain n-Si / MoTe2; and continuously putting the n-Si / MoTe2 into the magnetron sputtering instrument, sputtering a Bi0. 5Sb1. 5Te3 film on the surface of the MoTe2 film in an inert atmosphere, and carrying out annealing treatment. According to the invention, a self-powered practical device with high responsivity, high specific detection rate, fast response speed and high stability can be obtained.

A medication assurance system for verification of both the medication and the patient is disclosed. A portable spectrometer is used to obtain a light spectrum of the medication. A subject identification or biometric device is used to identify the patient. A controller coupled to the portable spectrometer and the subject identification device identifies the medication by performing a chemometric analysis of the light spectrum. Based on the medication identified and the patient identified, the controller can determine if the medication is to be taken by the patient.

A line-field optical coherence tomography (OCT) system and an absorbance spectroscopy system are provided that use a tunable or swept laser architecture in a cat's eye configuration with a tilt-tuned thin-film interference filter, preferably a transmissive tilt-tuned thin-film interference filter. [Solution] The optical coherence tomography system 200 of the present invention comprises a tunable laser 100 including a gain chip 110, a collimating lens 118 that collimates light from the gain chip 110, an end reflector 122, a focusing lens 120 that focuses the collimated light 124 onto the end reflector 122, a thin-film bandpass filter 130 between the collimating lens 118 and the focusing lens 120, and at least one angle control actuator 132 that changes the angle of the thin-film filter 130 relative to the collimated light 124, an interferometer having a reference arm 212 and a measurement arm 214 that receives light from the laser 100, and a sensor 230 that detects an interference signal between the light from the reference arm 212 and the light from the measurement arm 214.

Presented herein is an illumination assembly for providing polychromatic measurement light (230) for an optical measurement device. The illumination assembly includes an aperture component (202) having a first side and an opposing second side and at least one orifice (204), at least one pump light source (206) positioned to provide pump light (220) to the first side of the aperture component (202), and a photoluminescent component (208) positioned on the second side of the aperture component (202) for converting the pump light (220) receptive on the photoluminescent component (208) from the at least one pump light source (206) into polychromatic measurement light (230). At least a portion of the measurement light (230) can pass through the aperture component (202) through the at least one orifice (204) to provide the measurement light (230) to the first side of the aperture component (202). Also presented are related methods and measurement apparatus for using the lighting assembly.

We provide a cavity ring-down spectrometer that enables accurate measurement of extremely low-temperature samples. [Solution] The gas absorption spectrometer is a gas absorption spectrometer for measuring a sample gas and comprises a resonator 100A including at least two mirrors, a laser light source that emits laser light for irradiating the resonator 100A, and a photodetector for detecting the light extracted from the resonator. The resonator includes an inner chamber 1A that houses the mirrors 21 and 22 and forms a measurement space 15 into which the sample gas is introduced, an outer chamber 3A disposed outside the inner chamber 1A for vacuum insulation of the measurement space 15 from the outside, and a cooler 9 disposed within the outer chamber 3A, spaced apart from the inner chamber 1A, and having an internal space through which a refrigerant flows.

To provide a terahertz wave interferometry device that can shorten measurement time. [Solution] The terahertz wave interference measuring device 1A comprises an optical pulse train output unit 10A, a first conversion unit 21, a second conversion unit 22, a multiplexing optical system 23, and a detection unit 40A. The optical pulse train output unit 10A outputs a periodic first optical pulse train P1 having a first repetition frequency, and a periodic second optical pulse train P2 having a second repetition frequency smaller than the first repetition frequency. The first conversion unit 21 converts the first optical pulse train P1 into a first terahertz wave T1. The second conversion unit 22 converts the second optical pulse train P2 into a second terahertz wave T2. The multiplexing optical system 23 combines the first terahertz wave T1 with the second terahertz wave T2 to generate a third terahertz wave T3. The detection unit 40A detects the third terahertz wave T3.

An apparatus comprising a compact folded path cell for optical gas detection and / or measurement utilizing gas absorption spectroscopy. The apparatus includes an electromagnetic radiation source, a gas sample cell housing a reflector, and a detector for electromagnetic radiation. The source and detector are positioned between the reflector elements in a configuration that reflects the radiation away from the source and detector until the reflected radiation has a suitable optical path length, and then reflects the radiation towards the detector. Using spectroscopic analysis, the presence of at least one gas species in a gas sample can be determined and / or at least one parameter can be measured.

The invention comprises a method and system for cost effective, convenient remote high fidelity color reproduction and matching that can be used to convey color to observers remote from the physical source of color. Such remote observers can include product consumers wishing to view a product color, for example. In a preferred embodiment, the method comprises capture of article or product reflectance spectra and the use of this spectrum to filter ambient light or directed light in the environment of a user remote from the article or product. Other embodiments of methods include various techniques to capture product spectral information and color matching functions useful for color reproduction using colored light sources. Additional systems embodiments include devices exploiting multiprimary displays to render the product color with reduced metamerism.

A gas sensor (100) is described, which comprises a gas absorption cell (6), configured to house a gas to be detected, an incandescent light bulb (1) comprising a glass bulb (2) and a filament (3) enclosed in the glass bulb (2). The gas sensor (100) also comprises a first detector (4), configured to detect radiation in a first wavelength range of 1-5 um, and a control unit (7), configured to provide a drive current through the filament (3) of the incandescent light bulb (1) during operation of the gas sensor (100). The gas sensor comprises a second detector (5), configured to detect radiation in a second wavelength range of 6-15 µm radiation. The second detector (5) is arranged such that the second detector (5) is illuminated by radiation from the incandescent light bulb (1) during operation of the gas sensor (100).

An optical detector (100, 200, 300) for detecting gas and suspended matter therein includes a test chamber (111, 113), at least one light source (12), a sensing object (131, 133), a test optical sensor (141) and a processor (19). The test chamber (111, 113) accommodates a gas to be analyzed. The at least one light source (12) emits an incident light that enters the test chamber (111, 113). The sensing object (131, 133) is exposed to gas in the test chamber (111, 113), receives the incident light, and reflects or transmits a portion of the incident light to form a test light. The test optical sensor (141) receives the test light and generates a detected spectral signal. The processor (19) receives the detected spectral signal and calculates a detection result according to the detected spectral signal.

A liquid (2) measurement chamber extension (10) for spectrophotometric characterization of a liquid (2) in a polymer container (3) by a NIR spectrophotometer (1) or a Raman spectrophotometer (1), the measurement chamber extension (10) comprising an adapter plate (11) having an adapter opening (11'); a container holder (7); and an optical element (5) selected from a mirror and a waveguide; the adapter (11) is configured to cover a measurement chamber (20) of the NIR spectrophotometer (1) or the Raman spectrophotometer (1) in a light-tight manner, the adapter opening (11') surrounding a measurement window of the NIR spectrophotometer (1) or the Raman spectrophotometer (1) to allow the NIR spectrophotometer (1) or the Raman spectrophotometer (1) to measure the spectrophotometric characterization of the liquid (2) in the polymer container (3). a measurement chamber extension (10) configured to provide exposure of the liquid (2) to a measurement light beam emitted from a measurement chamber (20) of a spectrophotometer (1) through the measurement window; the container holder (7) configured to bring the optical element (5) in close proximity to the polymer container (3) containing the liquid (2) to provide loss-free transmission or transflective of the measurement light beam from the optical element (5) to a detector of the NIR spectrophotometer (1) or the Raman spectrophotometer (1), the container holder (7) comprising a clamp (13) configured to hold a tubular section (3a) of the polymer container (3) to enable reproducible measurement conditions.

There is described a system and method for measuring properties of water, such as surface water at site. That site may be in an agricultural setting. The properties of water, such as surface water may include nitrates and / or dissolved organic carbons. An example system may comprise a light source configured to emit a broadband source signal comprising a particular bandwidth for use in measuring a range of particular properties of water as well as an optical device configure to split the source signal into a measurement signal, and a corresponding reference signal. The system may also comprise a sensor unit configured to communicate a measurement signal through water at the sensor unit (e.g., when located in a stream), and a spectrometer configured to receive both a measurement signal having been communicated through water at the sensor unit and a reference signal from the optical device. Such a spectrometer may be configured to separate received measurement signals and reference signals into common component wavelengths, those common component wavelengths being associated with expected properties of water; and the system may be further configured to use respective component wavelengths of a measurement signal together with those of a reference signal to determine one or more particular properties of measured water.

The invention relates to the technical field of spectral analysis, and discloses a light intensity adaptive closed-loop adjustment system and method for spectrum monitoring, and the method comprises the following steps: presetting a light intensity target range; establishing an environment and equipment influence model based on regression analysis, and calculating and outputting a theoretical light intensity expected value; after the light source irradiates a sample, the sample absorbs light intensity, and the spectrum detector receives a light signal absorbed by the sample, processes the received light signal and outputs full-wave-band real-time light intensity original data; comparing the real-time light intensity original data with a theoretical light intensity expected value to obtain effective light intensity; and comparing the effective light intensity with a preset light intensity target range to obtain an adjustment deviation value between the target light intensity and the actual light intensity, and generating an optimization adjustment strategy. According to the method, the light intensity error caused by environment change and equipment state is dynamically predicted and eliminated through regression analysis and an error estimation function, so that more accurate effective light intensity is obtained.

A spectrometer device (110) for obtaining spectroscopic information on at least one object (112), wherein the spectrometer device (110) comprises: - at least one detector (116) for detecting detection light (118) from the object (112); - at least one optical filter (120) configured for transferring incident light within at least one selected wavelength range onto the detector (116), wherein a transmission profile of the optical filter (120) is dependent on an angle-of-incidence; - at least one light source (124) configured for emitting illumination light (126) in at least one optical spectral range; - at least one sample interface (130) configured for allowing the illumination light (126) to illuminate the object (112) and configured for allowing light from the object (112) to propagate via the optical filter (120) to the detector (116); - at least one first optical path (132), wherein the first optical path (132) is configured for allowing the illumination light (126) to propagate via the optical filter (120) to the detector (116) by passing the sample interface (130) at least once, wherein the optical filter (120) has a first transmission profile (T 1,NBP) for the first optical path (132); - at least one internal calibration target (134) and at least one second optical path (136), wherein the second optical path (136) is configured for allowing the illumination light (126) to propagate via the optical filter (120) to the detector (116) by interacting with the internal calibration target (134) at least once, wherein the optical filter (120) has a second transmission profile (T 2,NBP) for the second optical path (136); wherein the transmission profiles of the optical filter (120) of the first (132) and the second optical paths (136) are proportional to each other with T 1,NBP(λ) = d • T 2,NBP(λ) with d being independent of one or more of temperature, wavelength, or angle-of-incidence.

A system for monitoring an aging state of a nuclear power plant cable according to one embodiment of the present invention comprises: an aging index calculation unit for calculating an aging index by substituting, as a variable, a spectrum analysis result value representing a molecular structure into an aging index evaluation formula, the spectrum analysis result value being provided by a spectrum analysis unit of an FTIR device that analyzes an infrared absorption spectrum detected after irradiating infrared rays onto a suspected area of a nuclear power plant cable suspected of aging made of XLPE material and detecting infrared rays for measurement passed through the nuclear power plant cable suspected of aging; and an aging state determination unit for evaluating aging of the nuclear power plant cable suspected of aging by comparing the aging index of the suspected area of the nuclear power plant cable suspected of aging calculated by the aging index calculation unit with the aging index of a normal area of the nuclear power plant cable suspected of aging.

A line field optical coherence tomography (OCT) system and an absorption spectrometer system employing a tunable or swept laser architecture. The laser is a cat's-eye configuration with a preferably transmissive tilt tuned interference thin film filter.

An interference measuring device 1A comprises a light source 10, an interference optical system 20A, a photomultiplier tube 30, an interference intensity measuring unit 40, a unit 50 for calculating the electric field amplitude, and an analysis unit 60. The light source 10 emits light in a band (a light band containing terahertz waves) to which the photomultiplier tube 30 is sensitive. The photomultiplier tube 30 is sensitive in a light band containing terahertz waves and outputs an electrical signal with a value corresponding to the intensity of the incident light.The unit 50 for calculating the electric field amplitude converts a value of intensity V of interference light, measured by the interference intensity measuring unit 40, into a value of electric field amplitude E, based on a relationship between a value of the electric field amplitude of light incident on the photomultiplier tube 30 and a value of the electrical signal output by the photomultiplier tube 30. It obtains the value of the electric field amplitude E of the interference light for each value of a time difference Δt, which corresponds to an optical path length difference Δd. Thus, an interference measuring device and an interference measurement method are realized that can perform Fourier spectroscopy by interference measurement using a terahertz wave quickly and accurately.

A spectroscopic device includes: an analysis optical system; a length measurement optical system; and a calculation device. The analysis optical system includes a moving mirror and a first light receiving element. The length measurement optical system includes a second light source configured to emit laser light, a gas cell with a gas that absorbs light of a predetermined wavelength sealed therein and configured to cause the laser light to be incident thereon, an emitted light amount detection unit configured to detect an amount of light emitted from the gas cell and output an emitted light amount detection signal, a light source control unit configured to control a wavelength of the laser light based on the emitted light amount detection signal, and a length measurement unit configured to use the laser light to obtain a displacement signal corresponding to a position of the moving mirror, and the calculation device includes a moving mirror position calculation unit, a light intensity calculation unit, and a Fourier transform unit configured to generate a spectral pattern.

The optical filter switching assembly comprises a cam, a swing rod, an optical filter disc and a front cover plate, the front cover plate is located between the swing rod and the optical filter disc, the swing rod comprises a correction part and a rotating part, the rotating part is connected with the optical filter disc through a rotating shaft, the rotating shaft penetrates through the front cover plate, and the front cover plate is connected with the correction part. The cam drives the swing rod to rotate, and the swing rod drives the filter disc to rotate. A cam containing groove is formed in the face, opposite to the cam, of the rotating part, a step is arranged on one end face of the cam, and the horizontal plane of the step is connected with the cam containing groove. A correction hole is formed in the correction part, the correction hole is connected with one end of a spring, and the other end of the spring is fixedly connected with a screw on the front cover plate. Through the mutual cooperation of the cam and the swing rod, the rapid switching of the optical filters can be effectively realized, and the switching process is smooth without blocking.

An example spectrum measurement apparatus includes: a plurality of first light emitter units, where each first light emitter unit is adapted to emit light having a first emission spectrum in a first band range, first emission spectrums emitted by any two first light emitter units are not correlated, and the plurality of first light emitter units can be operated to emit light having corresponding first emission spectrums to a to-be-measured object in a time-division manner; a first single-point photodetector, adapted to separately detect light intensity of light that is emitted by each first light emitter unit and that is reflected by the to-be-measured object; and a calculation apparatus, adapted to determine a first reflectivity spectrum of the to-be-measured object in the first band range based on the plurality of first emission spectrums and the detected corresponding light intensity.

The invention discloses an on-line measuring device and method for a high-energy broadband pulse laser light field and a far-field focal spot. Broadband pulse laser generated by a high-energy laser device is processed by an intensity attenuation system and then reaches a light splitting element; the light beam penetrating through the spectroscope penetrates through a coding plate, the coding plate is used for carrying out coding modulation on the light beam, and then a table array light intensity detector is used for recording the intensity of a single-frame diffraction image formed after modulation of the coding plate; and the spectral data of the light beam reflected by the light splitting element is recorded by a spectral analysis unit. The near-field complex amplitude (intensity and phase) distribution of a to-be-measured high-energy broadband pulse laser light field can be accurately reconstructed through a multi-mode light field reconstruction algorithm by means of single-frame diffraction image intensity recorded on line by an area array light intensity detector and single-time spectrum data recorded on line by a spectrum analysis unit, and meanwhile far-field focal spot distribution can be obtained through inversion. The method has the advantages of simple structure, low cost, strong environment anti-interference capability and the like.

Microscopic imaging devices, systems and methods are provided. A microscopic imaging device includes a lens assembly, a first light source assembly, and one or more detection assemblies. The lens assembly has relatively short working distance, a relatively light weight, and / or multiple optical elements. The first light source assembly is configured to illuminate and / or excite a sample disposed at the working distance of the lens assembly. The one or more detection assemblies are configured to detect the light from the sample. The lens assembly, the first light source assembly, and at least one detection assembly are positioned to form an epiconfiguration.

The spectrometer includes: a light source unit emitting a laser beam; a mirror unit including a first plane mirror having a first mirror surface and a second plane mirror having a second mirror surface, wherein a measurement target is introduced between the first mirror surface and the second mirror surface; and a light detector detecting the laser beam returned by multiple reflection between the first mirror surface and the second mirror surface. The first mirror surface and the second mirror surface are arranged non-parallel to each other when viewed from the Z-axis direction so as to form an optical path of the laser beam reciprocating in the Y-axis direction while performing multiple reflection between the first mirror surface and the second mirror surface. The optical path of the laser beam between the first mirror surface and the second mirror surface is inclined with respect to the Z-axis direction.

An optical detector arrangement (10) is specified, said optical detector arrangement (10) comprising - a first detector device (1) which is configured to detect first electromagnetic radiation (3) in the range of visible light and near infrared radiation, and - a second detector device (2) which is configured to detect second electromagnetic radiation (4) in the range of near infrared radiation and shortwave infrared radiation. Further, a sensor arrangement is specified.

The present disclosure provides an integrating-sphere-assisted resonance synchronous (ISARS) spectroscopy method performed with an ISARS spectrophotometer, for example, a spectrofluorometer equipped with an integrating-sphere accessory. The methods and systems of the present disclosure utilize the ISARS spectrophotometer equipped with an integrating sphere to determine the ISARS spectral intensity, quantify the ISARS-based absorbance, and subsequently evaluate the sample's double-beam UV-vis absorbance spectrum (also known as the absorption extinction spectrum). This ISARS method enables quantitative separation of light absorption and scattering contribution to the sample UV-vis extinction spectrum measured with double-beam UV-vis spectrophotometer.

The invention relates to a photometer (30) for analysing the composition of a sample gas. The photometer comprises an infra-red (IR) source (20) configured to direct a first plurality of pulses (40) of IR radiation through the sample gas to an IR detector (26), at least two of the first plurality of pulses being of different wavelength. The photometer further comprises an ultraviolet (UV) source (32) configured to generate a second plurality of pulses (38) of UV radiation for conveyance to a UV detector (36), at least two of the second plurality of pulses being of different wavelength. A path selection arrangement (22, 42-50) is configured to selectively convey different ones of the second plurality of pulses (38) to one of the sample gas and the UV detector (36). The photometer further comprises processing circuitry coupled to the IR source (20), the UV source (32), the IR detector (26), the UV detector (36) and the path selection arrangement (22, 42-50). The processing circuitry is configured to (i) select the wavelength to be used for a given UV pulse of the second plurality of pulses (38), (ii) receive a plurality of detection signals from each of the IR detector (26) and the UV detector (36) and (iii) based on the detection signals, determine a concentration of at least one component of the sample gas. A method for analysing the composition of a sample gas is also disclosed.

The quantum optical system changes a phase of quantum interference occurring between a plurality of physical processes, in each of which a quantum entangled photon pair of a signal photon and an idler photon is generated. Each of a plurality of pixels outputs a detection signal of the signal photon in a state where a sample is arranged in an optical path of the idler photon. A processor calculates an absorption spectroscopy characteristic based on an interferogram indicating a variation in a signal intensity acquired from each of the plurality of pixels in accordance with the change in the phase of the quantum interference. The processor: applies a processing to reduce phase difference of the interferogram among the plurality of pixels; spatially integrates, over the plurality of pixels, the interferogram having gone through the processing to reduce phase differences; and calculates the absorption spectroscopy characteristic based on the integrated interferogram.

A spectroscopy system comprises a tunable laser including a gain chip, a collimating lens for collimating light from the gain chip, an end reflector, a focusing lens for focusing the collimated light on the end reflector, a thin film bandpass filter between the collimating lens and the focusing lens, and an angle control actuator for changing the angle of the thin film filter to the collimated light. The light from the laser is coupled into a sample cell providing a sample. An amplitude detector detects light from the tunable laser prior to passing into the sample cell and a sample detector detecting light from the tunable laser after passing through the sample cell. A processor controls the angle control actuator and monitors a time response of the sample detector and the amplitude detector to resolve an absorption spectra of the sample.