34 results about "Laser induced fluorescence spectroscopy" patented technology

A method based on spectral subtractions of normalized time-resolved laser-induced fluorescence (TRLIF) spectra produces multiple fingerprints of petroleum oils simultaneously. The method utilizes the simultaneous excitation of the TRLIF spectra of six oil samples using synchronized optical shutters. Five of the samples are standard oil samples while the sixth is the targeted sample. Instead of one fingerprint for the targeted sample, the technique produces multiple fingerprints representing the spectral subtractions between the normalized TRLIF spectra of the target sample and those of each of the standard oil samples. The technique provides fingerprints of higher distinguishing ability than a prior method, allowing it to discriminate between closely similar petroleum oils even under weathered conditions. The technique requires no sample preparation and can be applied remotely. It can also identify the original grade of the petroleum oils from their weathered remains.

The invention relates to a microscopic fluorescence identification method for an arene component of a petroleum inclusion. The method comprises the following steps of: quantitatively detecting the arene component of the petroleum inclusion by a laser induced fluorescence spectrum technology under a microscopic environment; acquiring a fluorescence spectrum of fluid in the petroleum inclusion by alaser fluorescence spectrum technology under the microscopic environment; and performing correlation contrastive analysis on fluorescence spectra of a crude oil sample and an extracted oil sample to determine the maximum related oil sample of the fluid in the petroleum inclusion, wherein the arene component content of the maximum related oil sample is similar to the component content of the fluidin the petroleum inclusion. By the method, the samples are subjected to three-dimensional microarea movement, microimaging and computer imaging by microarea positioning and microimaging technologies,so that a single oil gas inclusion sample to be irradiated can be selected and positioned precisely; full fluorescence excitation and full spectrum acquisition corresponding to the arene component inthe selected single oil gas inclusion are realized by tunable laser generation and fluorescence full spectrum acquisition technologies; and the acquired fluorescence spectrum of the arene component of the single oil gas inclusion is subjected to correlation contrastive analysis by a spectrum fingerprint technology and a spectrum multiscale data analysis technology to realize oil source comparisonand determine the relative content of the arene component of the targeted inclusion.

The invention provides a comprehensive testing method of the optical performance of a deep ultraviolet optical element. According to the comprehensive testing method, the absorption loss absolute value of the deep ultraviolet optical element is measured based on the laser heat measurement technology; the fluorescence spectrum of the deep ultraviolet optical element is measured based on the laser-induced fluorescence spectrum technology when the deep ultraviolet optical element is irradiated by a deep ultraviolet laser; the defect level, the contents of doping components and the content of impurities of a material of the deep ultraviolet optical element are measured based on the Raman spectra technology. Through measurement of the absorption loss feature, the fluorescence spectrum feature and the Raman spectral feature of the deep ultraviolet optical element at the deep ultraviolet laser wavelength, the comprehensive optical performance of the deep ultraviolet optical element is estimated. By measuring the real-time change of the absorption loss, the fluorescence spectrum and the Raman spectrum of the deep ultraviolet optical element in the process of deep ultraviolet laser irradiation, the stability of the performance of the deep ultraviolet optical element is monitored. By the adoption of the same device, the optical feature parameters of the deep ultraviolet optical element are measured and the change of the optical feature of the deep ultraviolet optical element in the process of deep ultraviolet laser irradiation is monitored in real time.

The invention provides a testing system and method for jointly identifying oil types using terahertz and laser, the system includes: a terahertz single-station time-domain spectroscopy device, a laser-induced fluorescence spectroscopy device, a sample placement device, and a sample detection device; The Hertz single-station time domain spectroscopy device and the laser-induced fluorescence spectroscopy device use a laser source together. The laser light is directly irradiated on the sample to be tested to generate a terahertz time-domain signal and a fluorescence spectrum of the sample to be tested, and the sample detection device is used to detect the sample to be tested according to the terahertz time-domain spectrum signal and the fluorescence spectrum. The detection and recognition system proposed by the invention can be used for the test and recognition of all oil products, has the characteristics of comprehensive recognition types, high accuracy, fast recognition speed, and low test cost, and is an oil product detection and recognition product with application prospects.