38 results about "Optical absorption spectra" patented technology

A method of developing a multivariate optical element for an optical analysis system includes forming an optically absorptive spectral element having an optically absorptive material, the optically absorptive material being absorbing in a predetermined spectral region; and utilizing the optically absorptive spectral element in the optical analysis system.

System and apparatus for portable gas detection. Specifically, this disclosure describes apparatuses and systems for optical gas detection in a compact package. There is a need for a very compact, low-power, gas detection system for gases such as CO2, NOx, water vapor, methane etc. This disclosure provides an ultra-compact and highly efficient optical measurement system based on principals of optical absorption spectroscopy. It reduces the size of the instrument as well its power consumption by more than an order of magnitude making it possible to deploy it widely. There is an identified need for large number of distributed gas sensors to improve human health, environment, and save energy usage.

An optical absorption spectrometer is provided for determining the concentration of a substance within a sample. The optical absorption spectrometer comprises a first radiation source for supplying radiation to the sample to be measured; at least one cavity for containing the sample during measurement; and a detector assembly for detecting radiation transmitted along first and second optical paths through the sample, the length of the first optical path being greater than that of the second optical path.

The invention discloses a high-efficiency ternary organic solar cell and a preparation method thereof. The active layer of the organic solar cell is obtained by blending a donor material and a receptor material. A ternary organic solar cell containing both non-fullerene and fullerene receptors is prepared by introducing a third component, fullerene acceptor, into the active layer of a binary non-fullerene organic solar cell. The addition of the fullerene receptor not only broadens the optical absorption spectrum of a device and increases the short-circuit current density, but also modifies theshape of the active layer, and finally improves the photoelectric conversion efficiency of the organic solar cell. Further, the active layer of the ternary organic solar cell can be processed at roomtemperature, and a solution can be formed into a film by spin coating, blade coating, and screen printing. Without any physical optimization method, the method can improve the efficiency of the device, reduces the manufacturing cost of the organic solar cell, and is suitable for the roll-to-roll production process.

Perovskite materials useful in the manufacture of photovoltaic cells are provided. The perovskite materials have the formula AB′_0.5B″_0.5X₃ or A′_0.5A″_0.5B′_0.5B″_0.5X₃, wherein A, A′, and A″ are organic or inorganic cations, X is a halogen ion, B′ is tin, and B″ is germanium. Embodiments of the mixed tin and germanium halide perovskite materials possess a direct bandgap within the optimal range of 0.9-1.6 eV and have an optical absorption spectrum that is comparable to the state-of-the-art methylammonium lead iodide perovskites. The perovskite materials provided herein have been formulated to be lead-free.

A laser stimulated atom probe for atom probe imaging of dielectric and low conductivity semiconductor materials is disclosed. The laser stimulated atom probe comprises a conventional atom probe providing a field emission tip and ion detector arrangement, a laser system providing a laser short laser pulse and synchronous electronic timing signal to the atom probe, and an optical system for delivery of the laser beam onto the field emitting tip apex. The conventional atom probe is employed in a manner similar to that used for investigation of high conductivity materials. However, the electric field is held static while the laser is pulsed to provide pulsing of the ion emission rate. The laser pulsing is accomplished in a manner similar to prior implementations of pulsed laser atom probe spectroscopy. The laser pulses provide a trigger signal to enable recording the time of flight in the atom probe. The laser operates at a wavelength in the UV in order to enhance the optical absorption in semiconductor or dielectric field emission tips. The increased optical absorption allows efficient thermal pumping of the field evaporation rate. The tip apex field is also used to redshift the optical absorption spectra of the dielectric or semiconducting material under investigation, further enhancing the optical absorption. Due to the enhanced absorption, it is also possible to realize a photo ionization mechanism, wherein the laser stimulates electronic transitions from the more extended surface atoms, thereby ionizing the surface atom. The laser source is collimated by a collimation lens, reflected using dielectric mirrors, directed onto the sample tip using a focusing lens arrangement, collected from the tip using a collection lens, and directed into a beam stop. The laser beam diameter at focus is approximately 3-30 microns, thus, individual emission tips may be scanned from a field of tips illuminated by the laser pulse.

Provided herein are techniques for improved optical absorption measurements in the presence of time-varying etalons. In one aspect, a method for dynamic etalon fitting for adaptive background noise reduction in an optical sensor is provided. The method includes the steps of: obtaining a zero-gas spectrum measured using the optical sensor; obtaining an analyte gas spectrum of a target trace gas measured using the optical sensor; comparing the zero-gas spectrum and the analyte gas spectrum using fit parameters that compensate for drifting etalons in the optical sensor; and dynamically extracting the drifting etalons from the analyte gas spectrum to retrieve concentration of the target trace gas.

An optical absorption spectrometry system includes first and second light sources, a dichroic beam combiner and a wavelength selective module. The first light source emits first light having first wavelengths within a first wavelength range, and the second light source emits second light having second wavelengths within a second wavelength range different from the first wavelength range. The dichroic beam combiner includes a predetermined first reflectance/transmission transition region, the dichroic beam combiner being configured to transmit a first portion of the first light and to reflect a second portion of the second light to provide combined light. The wavelength selective module is configured to disperse the combined light received at an entrance aperture, to select a sample wavelength range of the dispersed light as sample light, and to output the sample light having the selected sample wavelength range from an exit aperture for illuminating a sample.

An organic compound, a donor-acceptor conjugated polymer, a formulation and a thin film, wherein a solution of the donor-acceptor conjugated polymer exhibits a peak optical absorption spectrum red shift of at least 100 nm when the donor-acceptor conjugated polymer solution is cooled from 140 DEG C to room temperature.

A system and method for nondestructive detection of gas in a sealed container. The system includes a light source housed in a light source housing and configured to emit a light beam for absorption in a substance to be measured, a detector housed in a detector housing and configured to detect the emitted light beam, a zone that accepts one or more of the sealed containers, each container being substantially optically transparent and containing the substance to be measured, the zone located between the detector and the light source, the light source configured to transmit the light beam through the zone, and a light source purging system comprising a light source channel surrounding the light source and positioned between the light source and the detector housing, the light source channel configured to expel purge gas from a purge gas source into the zone.

Disclosed herein is a glass panel unit including: a first panel including at least a first glass plate; a second panel arranged to face the first panel and including at least a second glass plate; a frame member formed in a shape of a frame corresponding in shape to respective peripheral portions which extend along edges of the first panel and the second panel, and bonded to the peripheral portions; and at least one spacer provided in a vacuum space between the first panel and the second panel. The at least one spacer contains a polyimide. The polyimide has an absorption edge at which an absorption index decreases in an optical absorption spectrum ranging from an ultraviolet ray to visible radiation. The absorption edge is equal to or less than 400 nm.

The invention discloses a discrete three-dimensional fluorescence/visible light absorption spectrum detection device for discriminating water quality pollution, which integrates a water path, a circuit and a light path, adopts a small spectrometer and a prism light splitting module, and is low in cost and convenient to carry and maintain; a discrete three-dimensional fluorescence spectrum and an absorption spectrum can be obtained at the same time in one-time on-site detection, and a characteristic peak is enhanced by utilizing the relevance of light absorption and fluorescence mechanisms. After circulating sampling is set, uninterrupted in-situ continuous measurement can be achieved, obtained spectral data cover water quality abnormal information and pollution type information at different times, and the data obtained through the device can be used for rapidly judging whether pollution exists or not and the pollution type. Through a side cloud cooperation mode, detected bottom layer data does not need to be uploaded to a cloud end for analysis, computing resources can be shared by a plurality of detection devices, the network flow of water quality analysis is saved, and the processing speed and the operation efficiency are improved.

The invention relates to the technical field of medical images, in particular to a common CT computer imaging omics stone component analysis system and method, and the system comprises a central processing system, a data collection unit, a data analysis module, printing equipment and a mobile phone terminal. The input end of the central processing system is unidirectionally and electrically connected with a system firewall, and the data collection unit is connected with the system firewall through a wireless network. Calculus components are analyzed through CT computer imaging omics and compared with data in a database, the defects of an existing calculus analysis method are overcome, and the calculus analysis method has the advantages that calculus can be detected and analyzed more accurately and effectively, data are prevented from being lost in the transmission process, and then detection errors can be reduced. The problem that at present, infrared spectrum detection analysis is mainly adopted for calculus component analysis, the infrared light absorption band characteristic of a calculus sample is not high enough, and certain errors exist in detection of some calculus components is solved.

The invention discloses a Cr-doped ZnS intermediate zone thin film and a preparation method thereof. The preparation method firstly cleans the soda-lime glass substrate, and then combines the ZnS target material with the Cr ₂ S ₃ The targets are respectively installed on the target positions of the magnetron sputtering apparatus, and then the cleaned soda-lime glass substrate is fixed on the stage, vacuumized, and then alternately sputtered ZnS and Cr in turn. ₂ S ₃ , deposit Cr-ZnS on the soda-lime glass substrate to obtain a laminated film, and finally put the laminated film into an annealing furnace for annealing, and finally obtain a Cr-ZnS intermediate zone film. The preparation method of the Cr-doped ZnS intermediate zone thin film of the present invention adopts the alternating magnetron sputtering method combined with the Cr-ZnS thin film prepared by annealing under a protective atmosphere, which has a mixed structure of sphalerite and wurtzite, In its UV-vis-NIR light absorption spectrum, it is located near 650nm and 459nm, with two additional absorption peaks appearing, indicating that there is an intermediate band formation in the original energy band structure, resulting in an increase in the light absorption coefficient and an increase in the light absorption intensity, further Provide guidance for the preparation of Cr‑ZnS intermediate zone thin film solar cells.