5 results about "Optical absorption spectra" patented technology

The invention relates to an opto-acoustic-ultrasonic multi-mode bone metabolism and senescence noninvasive detection method and device, and the method comprises the following steps: respectively collecting an ultrasonic signal and a multi-wavelength opto-acoustic signal in a detection period; calculating the ultrasonic sound velocity and the broadband ultrasonic attenuation coefficient of the to-be-detected bone based on the ultrasonic signal, comparing the ultrasonic sound velocity and the broadband ultrasonic attenuation coefficient with the data of the healthy bone, and preliminarily judging the health degree of bone metabolism; based on the ultrasonic sound velocity and the broadband ultrasonic attenuation coefficient of the to-be-detected bone, performing ultrasonic attenuation compensation on a bone tissue part in the photoacoustic signal; fitting the opto-acoustic signal subjected to ultrasonic attenuation compensation corresponding to each wavelength into a transmission equation of a macroscopic homogeneous medium, calculating to obtain a relative light absorption coefficient of each wavelength, and mapping the relative light absorption coefficient and the corresponding wavelength to obtain a relative light absorption spectrum of the to-be-detected skeleton; and performing linear fitting on the relative light absorption spectrum and the main component spectrum in the skeleton, decoupling related photoacoustic parameters of the chemical component content, and further judging the skeleton metabolism and aging degree. Compared with the prior art, the method has the advantages of being low in detection complexity, non-invasive, non-radiative, capable of comprehensively obtaining physical microstructures and biochemical information related to bone metabolism and aging and the like.

The invention relates to the technical field of anomaly recognition and detection, in particular to a paper cup forming and boxing anomaly detection method based on edge calculation, which comprises the following steps of: acquiring a microstructure interference fringe pattern, a material light absorption spectrum matrix and a surface electrostatic distribution cloud picture of a forming process in real time; generating a lattice distortion characteristic field of the material; performing potential energy gradient tracking on the surface electrostatic distribution cloud picture, and extracting an electrostatic aggregation feature vector; based on the real-time processing capacity of the edge calculation nodes, when it is detected that asymmetric diffusion occurs in a material lattice distortion characteristic field or an electrostatic aggregation characteristic vector exceeds a critical adsorption threshold value, a plasma neutralization instruction is sent to a forming mold, and dielectric constant compensation operation of the material pretreatment procedure is triggered. According to the invention, the limitation that multi-physical field abnormity is difficult to sense simultaneously based on single image or signal processing in the prior art is broken through.

The present invention discloses an optical hydrogen sensing material, a preparation method thereof, and a method for optically detecting hydrogen concentration. The optical hydrogen sensing material comprises a non-continuous thin film structure composed of densely arranged Pd nanoparticles. The preparation method is based on cluster beam deposition technology, in which Pd nanoparticles are deposited at a low deposition rate on the surface of a highly transparent quartz plate to form a disordered nanoparticle film with a certain visible light absorbance. Due to the interaction between the Pd nanoparticles, the particles are mutually coupled through the excited surface plasmon resonance, thereby presenting a significant plasmon resonance peak in the optical absorption spectrum. When the Pd nanoparticles reversibly adsorb hydrogen, the optical absorption spectrum will undergo significant quantitative changes depending on the external hydrogen concentration, thereby realizing the hydrogen sensing function. The key point in the preparation of the hydrogen gas-sensitive film is to deposit the Pd nanoparticles at an appropriate deposition rate to form a specific nanoparticle assembly structure and obtain a more stable sensor baseline.

This invention relates to a method and apparatus for photoacoustic bone metabolism feature analysis based on optical field modulation. The method includes: exciting a periodic pulsed beam with a laser; modulating the original laser beam into a spatially modulated beam using a spatial light modulator; irradiating the bone to be tested in a through-beam mode; constructing a controllable, gradually varying acoustic velocity gradient between the bone tissue and the ultrasound probe using a hydrogel with progressive acoustic impedance; acquiring photoacoustic signals generated by multiple wavelength pulsed beams incident on the bone to be tested in a photoacoustic through-beam mode during one detection cycle; fitting the photoacoustic signals corresponding to different wavelengths according to a set photoacoustic transmission equation to calculate the optical absorption spectrum curve of the bone to be tested. Compared with existing technologies, this invention has the advantages of being non-invasive, radiation-free, highly efficient, having high photoacoustic signal excitation efficiency, and a high signal-to-noise ratio.

The invention provides a supported catalyst as well as a preparation method and application thereof. The supported catalyst can cover a light absorption band of 300-600 nm, the light energy utilization efficiency is improved, and the juglone compound can be prepared with high selectivity, high yield, low catalyst consumption and high reaction rate.