11 results about "Atmospheric absorption" patented technology

The invention provides a laser output adjustment method and device, computing equipment and a storage medium, and the method comprises the steps: collecting environment parameters, and calculating a scattering coefficient and an absorption coefficient based on the environment parameters; calculating the atmospheric transmittance based on the attenuation coefficient and the absorption coefficient; determining a recommended wavelength and a recommended line width based on the atmospheric transmittance; and adjusting the output of a target laser according to the recommended wavelength and the recommended line width. Atmospheric environmental parameters are monitored in real time, a correlation model with laser transmission efficiency is established, laser wavelength and line width are dynamically adjusted according to environmental changes, real-time atmospheric absorption peaks are avoided, and stable output of the laser is achieved.

The invention belongs to the technical field of atmospheric trace gas detection, and particularly relates to a laser heterodyne radiometer for locking local oscillator optical power based on an adjustable optical attenuator. Comprising a variable optical attenuator and an optical fiber beam splitter, and the optical fiber beam splitter transmits local oscillation light attenuated by the variable optical attenuator to a first photoelectric detector and a frequency calibration module and carries out beam combination and frequency beating on the local oscillation light and signal light; the output end of the first photoelectric detector serves as the input end of the PID controller, a control signal is calculated and sent to the variable optical attenuator, and the frequency calibration module and the signal processing module are jointly and sequentially connected with the acquisition card and the upper computer to output a measurement result. By combining the variable optical attenuator with digital PID feedback control, dynamic and closed-loop locking of local oscillator optical power is realized, an atmospheric absorption spectrum without a slope baseline can be obtained, and the accuracy of measuring the atmospheric gas concentration by the laser heterodyne radiometer is effectively improved.

Techniques for atmospheric absorption determination using embedded sensor data are provided. In one example, a system includes a housing. The system further includes a sensing device within the housing. The sensing device is configured to determine a humidity within the housing and a temperature within the housing. The system further includes a logic device. The logic device is configured to compensate the humidity and the temperature based on a location of the sensing device within the housing relative to heat sources within the housing. The logic device is further configured to determine a moisture value based on compensation of the humidity and the temperature. The logic device is further configured to determine an atmospheric absorption value based on the moisture value. Related devices and methods are also provided.

The application discloses a kind of marine interface pollutant spatial distribution observation methods, it is related to marine environmental optical remote sensing monitoring technical field.The present application is according to the characteristics of sunlight spectrum sea surface reflection, selects solar sea surface glint as light source, improves the signal-to-noise ratio of spectral signal when collecting, simultaneously, the sunlight of specular reflection is no longer refracted into seawater, and will not change the atmospheric absorption structure of solar spectrum;When solar sea surface glint occurs reflection on sea surface, incident light is direct sunlight, and direct sunlight has a certain angle of incidence, so using solar sea surface glint as light source has clear observation geometry mode, can accurately calculate the optical path length of solar spectrum after absorbing near-sea surface atmospheric pollution gas, to accurately retrieve the concentration of relevant sea area near-sea surface atmospheric pollution gas, by setting equidistant observation angle in turn along the direction of solar sea surface glint, the distance resolution measurement of sea surface pollution gas can be realized.

This invention discloses a method and system for optimizing the spectral dispersion coefficient of a greenhouse gas spectrometer before launch. The method includes: acquiring the instrument's linear function, initial dispersion coefficient, and laboratory direct solar observation spectrum; simulating the atmospheric absorption spectrum based on a radiative transfer model and performing convolution processing using the instrument's linear function; screening for positionally robust reference absorption lines through environmental parameter sensitivity analysis; fitting the observed spectrum and simulated spectrum to find peaks, extracting the center wavelength, and calculating the wavelength shift; establishing a polynomial fitting relationship for the wavelength shift to obtain the wavelength shift fitting coefficient; performing a difference calculation between the initial dispersion coefficient and the wavelength shift fitting coefficient, keeping higher-order terms unchanged, and outputting the optimized dispersion coefficient. This invention can effectively improve the wavelength calibration accuracy of the spectrometer before launch.

The invention relates to the field of abnormal sound detection, and discloses a household electrical appliance omnibearing abnormal sound detection system comprising a data acquisition module used for acquiring sound and vibration signals of a household electrical appliance through a multi-mode sensor; the environmental parameter acquisition module is used for acquiring environmental parameters including temperature, humidity, air pressure, PM2.5 concentration, wind speed and ozone concentration in real time; the signal processing module is used for processing the acquired signals by adopting a self-adaptive filtering algorithm and carrying out sound propagation attenuation compensation based on environmental parameters, and the sound propagation attenuation compensation adopts a polynomial model comprising an atmospheric absorption attenuation item, an aerosol attenuation item, a wind field attenuation correction item and a chemical attenuation item; the abnormal sound recognition module is used for carrying out abnormal sound feature extraction and classification recognition on the basis of the compensated signal; and the control execution module is used for controlling the automatic detection device to complete tool butt joint and detection operation. According to the technical scheme, all-directional abnormal sound detection of the household electrical appliance is realized.

This invention discloses a method for solving the spectral emissivity of a wall surface based on a GRU network with an attention mechanism, comprising the following steps: dual-temperature calibration of an infrared radiometer using a reference blackbody; measuring the wall surface target using the calibrated infrared radiometer and calculating the target reference spectral radiance using the measurement results; constructing a GRU network model with an attention mechanism and training the model using the target reference spectral radiance data after removing atmospheric interference-related bands; using the trained network to predict and correct the mid-wave infrared and long-wave infrared regions, and solving the wall surface emissivity using the corrected spectral radiance. This method for solving the spectral emissivity of a wall surface, by constructing a recurrent neural network model, can correct the target reference spectral radiance, effectively eliminating the influence of atmospheric absorption on the emissivity solution and improving the accuracy of the wall surface spectral emissivity solution.

The invention discloses a stationary orbit hyper-spectrum detection system applied to high-aging dirt and carbon collaborative observation. According to the method, the problem of performance optimization caused by insufficient observation gas component elements, low spatial resolution, low observation timeliness and system integration of an existing remote sensor is solved. The invention provides a stationary orbit hyper-spectrum detection system for cooperative observation of pollution and carbon, which integrates pollution gas and greenhouse gas detection spectrum sections while exerting the advantage of high-time-efficiency observation of a stationary orbit, and realizes large dynamic range, ultra-high spectral resolution and high-sensitivity detection capability of near ultraviolet to short wave infrared atmospheric absorption spectrum.

The application discloses an infrared spectrum atmospheric absorption interference correction method and system, and the method comprises the following steps: establishing a historical spectrum database; based on a to-be-corrected sample, screening from the historical spectrum database to obtain a near-neighbor reference base spectrum; setting a correction branch: a reference spectrum generation branch generates a reference spectrum of the to-be-corrected sample based on the to-be-corrected sample, the near-neighbor reference base spectrum and environmental and instrument parameters; a physical correction branch constructs a differential interference component based on a time sequence spectrum window, and carries out physical constraint correction by using a multi-spectrum robust estimation and an adaptive segmented scaling factor to obtain a physically corrected spectrum; a deep learning branch carries out deep residual learning on the to-be-corrected sample, the reference spectrum and the physically corrected spectrum to obtain a deep corrected spectrum; and according to the uncertainty or consistency of the correction branch, the corrected spectrum is adaptively fused to obtain a final corrected spectrum. The application realizes more fine and more robust correction of the infrared spectrum atmospheric absorption interference.

The present application relates to a kind of infrared absorption waveband atmospheric spectral transmittance measurement method, it is related to detection field, including the following steps, selecting the spectrometer capable of covering absorption waveband, and installing atmospheric absorption band filter on spectrometer;According to the minimum, maximum measurement value of spectrometer parameter selection corresponding attenuator;Spectrometer is directly aimed at solar spectrum data acquisition, reads the background average corresponding digital value measured by spectrometer;The bad point of calculated spectral data is rejected;Using the spectral calibration data in laboratory, the spectral data that has been rejected is quantitatively inversed, the radiation brightness of spectrometer is calculated;The absorption waveband spectral brightness of solar reaching ground is calculated;According to the radiation brightness of calculated spectrometer and the absorption waveband spectral brightness of solar reaching ground, atmospheric spectral transmittance is directly calculated, the present application has the advantages of expanding the measurement and inversion means of shortwave infrared absorption band atmospheric transmittance spectral research.

The invention provides an airport aircraft noise prediction method fusing an ellipsoid and a nonlinear function, relates to the technical field of environment monitoring and noise control, and solves the problem that the existing method is difficult to accurately describe the limitation of the propagation process of noise in a real dynamic environment. The method comprises the following steps: acquiring aircraft track data and ground monitoring point coordinates and noise data, and converting the data into a three-dimensional rectangular coordinate system; screening effective noise events based on the noise data, and performing association matching with the track data; based on the Morse theory of a motion sound source, constructing an ellipsoid model representing the sound level contour surface of the aircraft noise; based on noise attenuation characteristics and an ellipsoid model, combining Doppler effect and atmospheric absorption attenuation, and constructing a nonlinear function of noise sound level attenuation along with distance; and carrying out parameter optimization solution by utilizing a genetic algorithm to obtain optimal parameters of the model and outputting a noise prediction result. According to the method, an existing noise prediction technology system is perfected, and the aircraft noise influence in the peripheral area of the airport can be accurately evaluated.