36 results about "Laser induced fluorescence spectroscopy" patented technology

The invention discloses a laser-induced fluorescence spectrum rare earth element detection method and system based on light field regulation and control, and belongs to the technical field of spectral analysis and optical precision detection. According to the method, a super-continuum spectrum light source is matched with an acousto-optic tunable filter to achieve rapid and accurate tuning of excitation wavelength, excitation light is converted into an angular or radial polarized vector light beam through a vortex wave plate, then the vector light beam is tightly focused through a high-numerical-aperture objective lens, remarkable local enhancement of a longitudinal electric field or magnetic field component is formed in a focus area, and the high-frequency laser is obtained. Therefore, electric dipole or magnetic dipole transition fluorescence signals of the rare earth ions are selectively enhanced, and the fluorescence signals are collected and analyzed by a spectrograph. The method has the advantages of high signal-to-noise ratio, strong specificity and flexible operation, and is suitable for trace detection and spatial distribution imaging of rare earth elements in geological, material and environmental samples.