1060results about "Absorption/flicker/reflection spectroscopy" patented technology

Methods of creating and using digital twins of vegetation / crops in relation to their growing environments. Some embodiments include creating a digital twin of the growing environment using sensor data from a subsurface sensor suite, creating a digital twin of the vegetation crop using data from an overhead sensor suite, and using at least one mathematical model to relate the digital twin of the crop to the digital twin of the growing environment. In some embodiments, the mathematical model(s) implement a root cause analysis that uses a limiting factor approach. In some embodiments, the subsurface sensor suite is on a multi-sensor soil probe. In some embodiments, the multi-sensor soil probe comprises a video microscope, a tip stress sensor, a sleeve stress sensor, and a volumetric- water-content sensor. Other related systems, devices, methods, and software are also disclosed.

An example apparatus, method, and system for determining a characteristic of a target gas in a fluid sample is provided. In some embodiments, the example apparatus includes a frequency comb illumination source configured to emit pulsed light having a plurality of frequency comb wavelengths. The apparatus also includes an optical cavity containing a fluid sample and exhibiting a plurality of cavity resonance modes. A frequency comb wavelength of the plurality of frequency comb wavelengths associated with the frequency comb illumination source is configured to align with a cavity resonance mode of the plurality of cavity resonance modes. A characteristic of the fluid sample is determined based on one or more optical characteristics of a transmitted light passing through the fluid sample within the optical cavity.

Modulation-encoded light, using different spectral bin coded light components, can illuminate a stationary or moving (relative) target object or scene. Response signal processing can use information about the respective different time-varying modulation functions, to decode to recover information about a respective response parameter affected by the target object or scene. Electrical or optical modulation encoding can be used. LED-based spectroscopic analysis of a composition of a target (e.g., SpO2, glucose, etc.) can be performed; such can optionally include decoding of encoded optical modulation functions. Baffles or apertures or optics can be used, such as to constrain light provided by particular LEDs. Coded light illumination can be used with a focal plane array light imager receiving response light for inspecting a moving semiconductor or other target. Encoding can use orthogonal functions, such as an RGB illumination sequence, or a sequence of combinations of spectrally contiguous or non-contiguous colors.

The invention discloses a traceable cavity ring-down spectrometer system with a self-calibration function, and is applied to the technical field of gas concentration detection. The device comprises an optical cavity ring-down main body, a dynamic generation module and a reference analysis module which are connected in sequence, wherein the optical cavity ring-down main body comprises a laser light source, a beam splitter, an optical fiber isolator, a lens, a first reflecting lens, a first aluminum ring, a sample cell, a second aluminum ring, a cross shaft type universal coupling control device and a second reflecting lens which are arranged along a laser light path; the dynamic generation module comprises a high-purity gas inlet, a gas purifier, a dynamic generation device, a standard gas outlet and a three-way electromagnetic valve which are arranged along a gas path; the reference analysis module comprises an instrument standard gas inlet, a reference analyzer and a standard gas storage box which are arranged along the gas path. According to the method, the influence of instrument drift on analysis data caused by the use environment and instrument part loss of the online instrument is avoided, and the accuracy and the quantity value traceability of the instrument analysis data are guaranteed.

A multipass cell (300) comprising: a first reflector arrangement (305A, 305B); and a second reflector arrangement (307), the first (305A, 305B) and second (307) reflector arrangements defining an optical cavity (315) therebetween and the cell; wherein the first reflector arrangement (305A, 305B) is configured such that light incident on the first reflector arrangement (305A, 305B) is at least partially retroreflected towards the second reflector arrangement (307), wherein the second reflector (307) arrangement comprises a concave surface that is reflective, wherein at least one of the first (305A, 305B) and second (307) reflector arrangements comprises an aperture (306) for allowing light to enter and / or exit the optical cavity (315).

The invention relates to a spectrophotometer optical system, which comprises a first convergence part, an incident part, a first concave reflector, a light splitting reflection grating, a second concave reflector, an exit slit, a second convergence part, a detection pool, a convergent lens and a detection part, and is characterized in that the first convergence part comprises a first lens and a second lens which are sequentially arranged along a light path; the first converging part comprises a first concave reflecting mirror and a second concave reflecting mirror, the first concave reflecting mirror and the second concave reflecting mirror are off-axis concave reflecting mirrors, the second converging part comprises a first lens and a second lens, and light beams converged by the converging lens pass through the detection pool, pass through the converging lens after passing through the detection pool and are finally detected by the detection part. The spectrophotometer optical system provided by the invention can realize material optical analysis or test in a wide spectral range, and has the advantages of miniaturization and light weight.

The invention discloses a multi-component gas detection device and method based on a metasurface quasi-continuous domain bound state. The advanced nanometer manufacturing technology and the deep learning algorithm are adopted, and high-precision, high-sensitivity and high-selectivity gas detection is achieved. According to the invention, the metasurface array with specific design is utilized, and the quasi-continuous domain bound state in the middle-infrared band is realized by accurately regulating and controlling the geometric parameters and material characteristics of the microstructure, so that excellent optical response is obtained. In combination with a deep learning algorithm, complex spectral information is converted into accurate gas composition and concentration information, and a reliable solution is provided for the fields of environmental monitoring, industrial production, safety monitoring and the like.

The invention discloses an equipment on-line temperature measurement monitoring method based on thermal imaging, and relates to the technical field of on-line temperature measurement. The method comprises the following steps: synchronously acquiring reflection spectrum data and infrared thermal radiation data of a target surface through an integrated spectrum sensing module and a thermal imaging module; inverting the initial emissivity of the target area according to the reflection spectrum data based on Kirchhoff's law and a pre-stored material feature library; dynamically correcting the initial emissivity to generate a pixel-by-pixel corrected emissivity matrix; and carrying out pixel-by-pixel temperature calculation on the thermal imaging original data, constructing an equipment surface temperature distribution model, and carrying out abnormity early warning according to a preset threshold value. According to the method, through deep fusion of spectrum sensing and thermal imaging data, pixel-by-pixel emissivity calibration of complex surface equipment is realized, and the temperature measurement precision and reliability are remarkably improved.

Devices, methods and systems are disclosed for monitoring and analysis of bodily emissions emitted from a user. The device comprises at least an image capturing apparatus, at least one light emission source and, at least one sensor for capturing and monitoring excreta and urine from the user. An artificial intelligence based analysis system is utilized to process data collected from the device and determined at least one parameter based on the analysis. The determined parameter determines health-related information, which is communicated to the user via a user interface.

The invention provides a spectrometer system comprising a spectrometer chip comprising a camera and a metasurface located on a detection surface of the camera; the metasurface comprises a plurality of nano-pore or nano-column arrays, and selective absorption of light with different wavelengths is realized through surface plasmons generated by different nano-pores or nano-columns; the camera detects the intensity change of light to be detected after the light passes through different nano-pores or nano-column arrays of the metasurface, and then spectral information is obtained through calculation. According to the spectrograph system, selective absorption of light with different wavelengths is achieved through the metasurface, and then spectral information is obtained through calculation, so that the structure of the spectrograph system is compact, and the overall size is very small; and the plasmon generated by the nanopore or nanopillar array has high tolerance to the structure size, so that the processing precision is lower, and large-area and large-batch preparation can be realized.

The invention provides a single-pixel-based visible light infrared fusion compression spectrum imaging system and method, and the method comprises the following steps: 1, carrying out the signal coding of a to-be-detected target signal, and obtaining a coded to-be-detected target infrared signal and a coded to-be-detected target visible light signal; step 2, inputting a to-be-measured target infrared signal into an infrared imaging light path, collecting a medium-wave infrared spectrum intensity value, and inputting a to-be-measured target visible light signal into a visible light imaging light path to collect a visible light spectrum intensity value; step 3, carrying out compressed sampling and reconstruction operation on the visible light spectrum intensity value and the medium wave infrared spectrum intensity value to obtain an infrared hyperspectral image and a visible light hyperspectral image of the target to be detected; 4, performing image fusion according to the infrared hyperspectral image and the visible light hyperspectral image to obtain a fused image with rich details; the fusion imaging of the method has the characteristic of keeping the feature information of the target scene so as to realize high-quality imaging.

The present invention relates to a method for determining the concentration of a chemical compound of a fluid by means of an optical measurement system for measuring a light intensity spectrum, such that: (i) by means of a learning base comprising a plurality of learning light intensity spectra measured for a plurality of learning fluids each having a predetermined concentration, a model is constructed in order to determine the concentration of at least one chemical compound in a fluid by training a one-dimensional convolutional neural network on the learning base, the network being such that the number of convolutional filters per layer decreases with the position of the layer in the network; (ii): by means of the optical measurement system, at least one light intensity spectrum of the fluid is measured; (iii) the constructed model is applied to the measured light intensity spectrum, and the concentration of the chemical compound in the fluid is determined.

A system for evaluating a sample, the system includes (i) a chopper that includes (i.1) a disc that is made of a transparent material that bears an inner opaque pattern and outer opaque pattern, the outer opaque pattern surrounds the inner opaque pattern, and (i.2) a rotating unit that is configured to rotate the disc during a modulation period, (ii) first optics, (iii) second optics, (iv) a control unit that is configured to detect a second modulated beam from the second optics, and control the rotating unit based on at least one parameter of the second modulated beam.

A Raman-infrared spectroscopy analysis combination device including: a light source; a plate for fixing a sample; a stage on which the plate is placed; an objective optical element for obtaining Raman light; an objective optical element for obtaining reflected infrared light; a Raman light detection system; an infrared light detection system; a driving unit for adjusting a positional relationship between a position of the plate and the objective optical elements; a switching unit that switches between the detection systems; and a control unit for controlling the driving unit, the switching unit and the optical imaging elements. At least one of the plate and the stage is provided with a marker for adjusting the positional relationship, and the control unit controls the driving unit to adjust the positional relationship between the position of the plate and the objective optical elements based on a position of the marker.

A self-calibrating hybrid spectrophotometer comprises a receptacle for receiving the cuvette, first and second optodes that are configured to permit light to enter the cuvette, third and fourth optodes that are configured to permit light to leave the cuvette, and a controller that is configured to control delivery of light to one of the first and second optodes. Light entering one of the first and second optodes is received at the third and fourth optodes after having interacted with the turbid sample along different paths having different lengths. Measurements made at the third and fourth optodes in response to having illuminated both the first and second source optodes provide two slopes of optical transmittance as a function of path length. The spectrophotometer uses these slopes to identify a slope that is indicative of the absorption coefficient and the reduced scattering coefficient of the sample.

Provided is a simple, portable, real-time, and in vivo THz imaging device for imaging a target, e.g., a tooth in the subject. Moreover, the scanning based THz imaging device is much sufficiently sensitive as compared with the common X-ray imaging device. Therefore, the scanning based THz imaging device has the potential to operate in the density for early detection problems such as dental caries or demineralization of the enamel in the teeth. Also provided is a method for diagnosing or imaging the target in the subject by using the scanning based THz imaging device of the present disclosure.

The invention relates to the technical field of fire safety monitoring, and discloses a linear fire detection method and system based on infrared spectrum analysis and an infrared spectrum detector, and the method comprises the steps: arranging a plurality of infrared spectrum detector nodes; the collected infrared spectrum signals are preprocessed; mapping the preprocessed spectral signal to a pre-constructed low-dimensional feature space; calculating the conditional probability density of the current infrared spectrum signal in various states; judging whether the posterior probability exceeds a set fire judgment threshold value or not; the system comprises an infrared spectrum detection module, a preprocessing module, an embedded mapping module, a discrimination module and a linkage control module. The infrared spectrum detector comprises a spectrum sensing unit, a signal processing unit, a data communication unit and a data uploading interface. According to the method, the technical effects of keeping high sensitivity and low false alarm rate under complex and changeable working conditions are achieved through a combined discrimination model of embedding mapping, kernel density estimation and Bayesian posteriori.

Systems and methods of detecting and monitoring edema in a subject are described. The systems and methods include light sources, image detectors, filters, and processors that determine whether a subject has edema and the degree of severity. In some embodiments, the processor fuses data from more than one imaging modality.

Apparatus and methods are described for use with a bodily emission of a subject that is disposed within a toilet bowl. While the bodily emission is disposed within the toilet bowl, light is received from the toilet bowl using one or more light sensors. Using a computer processor, intensities of at least two spectral bands that are within a range of 530 nm to 785 nm are determined, by analyzing the received light, and a ratio of the intensities of the two spectral bands is determined. In response thereto, the computer processor determines that there is a presence of blood within the bodily emission. The computer processor generates an output on an output device, at least partially in response thereto. Other applications are also described.

An aspect of the disclosure provides an interferometric near infrared spectroscopy, iNIRS, system comprising: a light emitting arrangement comprising: a first light source configured to provide wavelength-swept emission of light through a plurality of different wavelengths in a first wavelength range; a second light source configured to provide wavelength-swept emission of light through a plurality of different wavelengths in a second wavelength range different to the first wavelength range; a common sample delivery channel coupled to each of the first and second light sources to receive light therefrom and to deliver said light towards a subject; and one or more reference channels for receiving reference light from the first light source and / or the second light source; a light detecting arrangement comprising an interferometrie optical detector; wherein the optical detector is coupled to the one or more reference channels for receiving reference light from the first and second light sources; wherein the light detecting arrangement is arranged to be coupled to the subject for the optical detector to receive sample light from the first and second light sources, the sample light comprising light which travelled along the common sample delivery channel; wherein the optical detector is arranged to combine the sample light with the reference light to provide combined light signals comprising one or more components at a beat frequency between sample light and reference light; and wherein the iNIRS system is configured to process the combined light signals for providing imaging and analysis of the subject.

The present invention relates in one aspect to an absorption spectroscopy apparatus for measuring one or more gases in an atmosphere, wherein the apparatus comprises a wavelength-tunable laser source, a control circuit configured to provide an electrical drive current to the wavelength-tunable laser source; wherein the control circuit is configured to create the electrical drive current as a modulated drive current, wherein the modulated drive current alternates between at least a first and a second drive current, the first drive current configured to cause the wavelength-tunable laser source to emit laser radiation at a first wavelength and the second drive current configured to cause the wavelength-tunable laser source to emit laser radiation at a second wavelength, different from the first wavelength, and wherein the modulated drive current defines a sequence of pulses, each pulse having a non-rectangular pulse shape.

A dual optical frequency comb light-emitting device includes a first optical-frequency-comb laser source that includes a first laser resonator having a first optical path length, a second optical-frequency-comb laser source that includes a second laser resonator having a second optical path length different from the first optical path length, and an optical coupler that causes a first portion of first optical-frequency-comb laser light emitted from the first laser resonator to enter the second laser resonator. The first optical-frequency-comb laser source outputs a second portion of the first optical-frequency-comb laser light to an outside. The second optical-frequency-comb laser source outputs second optical-frequency-comb laser light emitted from the second laser resonator to the outside.

The invention provides detection equipment which is applied to the field of detection, such as the field of spectrum detection. The detection equipment comprises an optical coupler, a scattering assembly, a detector and a processor. The optical coupler is used for receiving a to-be-detected light beam and coupling the to-be-detected light beam to the scattering assembly. The scattering assembly is used for scattering the to-be-detected light beams and outputting a plurality of scattered to-be-detected light beams to the detector at different angles in a time division manner. The plurality of scattered light beams to be detected are in one-to-one correspondence with the plurality of angles. The detector is used for detecting a plurality of different areas in the plurality of scattered light beams to be detected to obtain a plurality of paths of electric signals. The detector is further used for transmitting multiple paths of electric signals to the processor. And the processor is used for calculating the multiple paths of electric signals to obtain related information of the light beam to be detected. In the technical scheme provided by the invention, by adjusting the output direction of the to-be-detected light beam, the related information of the to-be-detected light beam can be obtained through the detector in a time division manner, so that the cost of the detection equipment is reduced.

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.

Apparatus and methods are described for use with a bodily emission of a subject that is disposed within a toilet bowl. One or more light sensors are configured to receive light from the toilet bowl, while the bodily emission is disposed within the toilet bowl. A computer processor detects a set of three or more spectral components that have a characteristic relationship with each other in a light spectrum of a microorganism, by analyzing the received light, and determines that there is a presence of the microorganism within the bodily emission in response thereto. Other applications are also described.

The invention discloses a combined optical filter multispectral imaging sensor and method. Relates to the technical field of sensors, in particular to the technical field of combined optical filter multispectral imaging. According to the method, the problem that wide-range and high-precision spectrum adjustment cannot be considered in the prior art is effectively solved, and the precision of multispectral spectrum section selection and weak and small target detection and recognition is improved. The imaging sensor comprises an imaging sensor, an optimized multispectral optical filter array and an optimized liquid crystal tunable optical filter; the imaging method comprises the following steps: a target background image enters the combined optical filter multispectral sensor to obtain narrow-band light of N wavebands and light to be tuned; converting the narrow-band light of the N wavebands and the light to be tuned into image signals; recovering a three-dimensional spectral image, and carrying out rough detection by combining an optical filter multispectral sensor; finely adjusting the combined optical filter multispectral sensor; and spectral imaging.

The invention relates to a method for determining whether an oilseed, a nut, in particular a hazelnut (2), or a seed is rancid, involving irradiating a sample, detecting an absorption or reflection spectrum, determining the content of at least one fatty acid decomposition product in the sample, and ascertaining a degree of rancidity using the content of the at least one fatty acid decomposition product in the sample. The method additionally involves irradiating an oilseed, a nut, in particular a hazelnut (2), or a seed, projecting reflected and / or transmitted light onto a detection photosensor (4′), detecting absorption or reflection spectra in a wavelength range of 300-2500 nm using the detection photosensor (4′), said detection photosensor having a plurality of pixels, and assigning a degree of rancidity to each pixel of the detection photosensor (4′).

The invention relates to the field of water and soil conservation online monitoring, in particular to a photonic integrated chip and a soil interface dynamic monitoring device and method. Comprising a substrate, and a beam splitting and combining device, a micro-ring resonator and a grating coupler which are arranged on the substrate, the beam splitting and combining device is connected with the micro-ring resonators, the micro-ring resonators are connected with the grating coupler, the perimeter of each micro-ring resonator is different, and the micro-ring resonators are sequentially arranged at intervals in sequence. According to the invention, real-time monitoring of the soil interface is realized through an accurate optical method so as to determine the height position change of the soil and air interface and further monitor water and soil loss, the method has high sensitivity, non-contact property and sustainability, the efficiency of water and soil loss monitoring can be effectively improved, and reliable technical support is provided for the fields of agriculture, environmental protection and the like.

A method for evaluating degradation of a photodetector (112), the photodetector (112) comprising at least one photosensitive element (116), the photodetector (112) being configured for generating at least one detector current depending on an illumination of the photosensitive element (116) by light, the photodetector (112) further comprising at least one evaluation unit (120) for evaluating the detector current, wherein method comprises: a) determining at least one detector current; b) evaluating the detector current with respect to at least one reference value to obtain at least one relative detector current value; and c) deriving at least one item of degradation information on the photosensitive element (116) using the relative detector current value, the item of degradation information describing the degradation of performance due to temperature hysteresis behavior, aging, excessive temperatures and / or excessive illumination.

A method includes determining whether a variation in probe radiation intensity meets a stability criterion; directing the probe radiation through a probe, when the probe is disposed at a first position, defining a first path length L1 of the probe radiation through the fluid sample; measuring a transmitted intensity I1 of the probe radiation after passing through the fluid sample when the probe is disposed at the first position; directing the probe radiation through the probe when the probe is disposed at a second position, defining a second path length L2 of the probe radiation through the fluid sample; measuring a transmitted intensity I2 of the probe radiation after passing through the fluid sample when the probe is disposed at the second position; and determining a concentration C of a material in the fluid sample based upon L1, I1, L2, and I2, when the stability criterion is met.