9results about How to "High spectral resolution" patented technology

The invention discloses a distinguishing table type X-ray spectrometer and an X-ray absorption spectrum testing method, and relates to the technical field of spectral measurement. The high-resolution table type X-ray spectrometer comprises a sample signal source which is located in a Dowland circle and is used for generating X-rays; the exponential crystal is a bent crystal, the surface shape of the exponential crystal is defined by an exponential equation, so that different points on the curved surface of the crystal have different curvature radiuses and correspond to Rowland circles with different radiuses, each point on the exponential crystal is tangent to the corresponding Rowland circle, and the exponential crystal is used for performing monochromatization and focusing on the X-ray incident from the sample signal source; and the detector is positioned on a surface formed by the corresponding imaging points on each Rowland circle, and is used for receiving the X-rays which are monochromatized and focused by the index crystal and outputting corresponding light intensity signals. Therefore, through the cooperation of the index crystal and the multi-Rowland circle structure, the X-ray absorption spectrum test with high light receiving efficiency, high spectral resolution and wide energy spectrum range can be realized, and the comprehensive performance of the desk type spectrometer is improved.

The application discloses a power transformer fault sound print detection method based on an extreme learning machine, first, audio signals of transformer faults are collected for framing, and preprocessed through fast Fourier transform; then, sound print characteristic parameters of the audio signals are extracted through an improved Mel filter, a fault sound print detection model based on the extreme learning machine is constructed, and model training is conducted; finally, a test set is established, real-time test samples are input into the trained fault sound print detection model, test identification is conducted, sound print identification results of transformer faults are obtained, and real-time fault sound print early warning is realized. The improved Mel filter can improve the spectral resolution of transformer sound print feature extraction, reduce the system complexity, the fault sound print detection model is constructed through the extreme learning machine algorithm, the transformer fault detection accuracy is effectively improved, and the method is easy to implement in engineering.

This invention discloses a snapshot-type hyperspectral three-dimensional skin imaging method and device, belonging to the field of biomedical imaging technology. The method includes: constructing a snapshot-type spectral-light field coupled imaging system containing a light source and an acquisition model; achieving full-domain skin illumination with broadband illumination; synchronously coupling and acquiring spectral and three-dimensional spatial information through the synergistic action of a lens group and a hyperspectral sensor to generate spectral coupled light field data; establishing a correlation dataset between the spectral coupled light field image and the hyperspectral light field image; training a spectral reconstruction network and solving the data; reconstructing the hyperspectral light field image and obtaining multi-view images through macro-pixel sampling; using a light field super-resolution network to improve image resolution; selecting the optimal skin penetration band image for stereo matching to obtain a target band depth map; and fusing the high-resolution center-view images from each channel with the target band depth map to complete the generation of a hyperspectral three-dimensional image. This invention achieves single-exposure hyperspectral three-dimensional imaging of the superficial skin layer.

The application relates to a miniature spectral imaging chip and a miniature imaging spectrometer, and belongs to the technical field of spectral imaging. The chip comprises, from top to bottom, an optical filtering layer, an image sensing layer and a signal processing layer. The optical filtering layer is composed of a transparent medium substrate and a plurality of different micro-nano structure units, each of which comprises a plurality of micro-nano structure arrays. The micro-nano structure arrays are single-layer or multi-layer structures. Each micro-nano structure unit covers a single or multiple photosensitive pixel units on a photodetector array layer. The area of the photodetector array layer covered by the micro-nano structure unit is a spectral chip area. The image sensing layer comprises the photodetector array layer and a metal circuit layer arranged on the photodetector array layer. The application realizes high spectral resolution and high image resolution in a very small volume.

The application discloses an infrared in-situ transmission sample assembly and an infrared transmission detection system. The infrared in-situ transmission sample assembly comprises a temperature-controllable heating tube, a metal tube sleeve and a sample support. The temperature-controllable heating tube comprises a tube main body. The metal tube sleeve comprises a main tube sleeve which is inserted into the tube main body and is electrically connected with a temperature controller. The sample support comprises a support main body which is inserted into the main tube sleeve and has a tubular structure with open ends. A groove is formed in one end of the support main body along the side surface, and the groove is used for inserting a sample to be measured so that the sample to be measured is in the pipeline of the support main body. The sample assembly can directly place the sample without loading or clamping other window materials, can avoid the breakage of the sample, is beneficial to the evaporation of a small amount of water vapor in the heating process, and thus can avoid the interference of water vapor in the measurement process. The application provides a more accurate and reliable sample accessory for the measurement and analysis of the infrared transmission spectrum.

The application provides a handheld multispectral imager, which comprises an image sensor, the image sensor comprising a pixel photosensitive unit, a light splitting structure, a transition layer, a first, a second and a third cut-off filter film, the narrow-band filter film in the light splitting structure being integrally deposited and grown on the pixel photosensitive unit, the transition layer being integrally deposited and grown on the narrow-band filter film, the first cut-off filter film being integrally deposited and grown on the narrow-band filter film, the transition layer being used for transitioning the two film systems of the narrow-band filter film and the first cut-off filter film, the second cut-off filter film being arranged on the first cut-off filter film, and the third cut-off filter film being arranged on the second cut-off filter film, the first, the second and the third cut-off filter films being respectively used for cutting off first, second and third interference wave bands. The technical scheme of the application is used to solve the technical problems of low spectral transmittance and low quantum efficiency caused by the cut-off filter film pasting mode in the prior art.

The invention provides a snapshot type spectral imaging system and method based on spatial spectrum hybrid coding. The system comprises a spatial spectrum hybrid coding imaging module and a decoding reconstruction module. Wherein the spatial spectrum hybrid coding imaging module sequentially comprises a filtering module used for filtering wave bands outside a working wave band range; the spectrum hybrid modulation module is used for applying composite modulation to an incident light field through multiplexing to obtain a hybrid modulation light field; the spectral filtering array module is used for performing pixel-level spectral filtering on the hybrid modulation light field in a spatial dimension; and the gray level acquisition module is used for capturing the mixed light field coded by the spectrum filtering module to obtain a two-dimensional measurement value. And the decoding reconstruction module is used for reconstructing a spectral image from the two-dimensional measurement image. According to the invention, the spatial and spectral information is synchronously obtained in single exposure, the joint optimization of the spatial resolution and the spectral resolution is realized, and a solution is provided for the problem of balancing the spatial resolution and the spectral resolution of a snapshot spectral imaging system.

The invention discloses a light and small infrared imaging spectrometer suitable for an unmanned aerial vehicle, and relates to the technical field of infrared imaging spectrums. The spectrometer is sequentially and optically connected with a front optical system, a slit, a PGP light splitting assembly, a rear optical system and a background suppression type detector in the infrared light propagation direction. The front optical system collects target infrared light and collimates the target infrared light; the slit limits the line view field range, and the spatial resolution of spectral imaging is guaranteed; the PGP light splitting assembly performs high-precision light splitting imaging on the light beams; the rear optical system is used for imaging spectral information after light splitting to a detector; the surface of the background suppression type detector is plated with a gradual filter, and the background suppression type detector is used for receiving spectral signals and suppressing normal-temperature background radiation. Through the collaborative design of high-precision spectral imaging of the PGP and narrow-band filtering of the background suppression type detector, a low-temperature refrigeration device is not needed, the system has the characteristics of light weight and low power consumption, the portability and environmental adaptability are improved, and the system is suitable for scenes such as unmanned aerial vehicle carrying and field detection.

The application provides a kind of three-dimensional lake blue-green algae biomass spectrum detection system, comprising: host computer and probe;Host computer and probe are connected by optical fiber;Light source emits light beam to light source reflection coating, produces diffuse reflection light beam to detection warehouse;Water tower head is arranged on the other side of detection warehouse, for the water body from detection warehouse is extracted after detection is completed;Collimating lens group is arranged on the top surface of detection warehouse, for imaging to the water body to be measured;Collimating lens group is connected with optical fiber through connecting device, and then connected with optical fiber switching structure and optical fiber spectrometer through optical fiber respectively.Diffuse reflection light beam enters the inside of detection warehouse through light inlet hole and irradiates the water body to be measured, and then the image is transmitted to optical fiber spectrometer through optical fiber after collimating lens group imaging, to obtain the spectral data of the water body to be measured.The application has the advantages of practical, portable, low cost and low power consumption.