44 results about "Fourier transform infra red" patented technology

A material and a method for forming a tamper-indicating identification coating are provided. The components of the coating are selected such that the coating exhibits a characteristic absorption spectrum with distinct features in individual regions during Fourier-transform infa-red (FTIR) spectroscopy. The coating components are selected to provide a distinct spectrum while, at the same time, providing a sufficiently complex spectrum such that the coating is difficult to duplicate. Also, a blowing agent in the coating decomposes to change the FTIR spectrum due to the heat associated with resoldering of an out-of-warranty electronic part marked with the identification coating to an in-warranty circuit card. In addition, the coating may contain a fluorophore to reveal the presence of a tamper-indicating identification coating, allowing a manufacturer to check the card by exposure with ultra-violet (UV) light. Further, the coating composition may be changed periodically and tracked to provide a date marker.

An FT-IR toxic gas monitoring system and method for detection of one or more toxic gas species in a fluid environment containing or susceptible to presence of toxic gases. Such gas monitoring system includes: (1) a spectroscopic monitoring assembly for transmitting modulated infrared radiation through a spectroscopic cell that contains a gas sample from such fluid environment and generating a corresponding digitized spectrum characteristics of such gas sample for analysis; (2) a gas sampling and delivery subsystem for sampling the fluid environment and delivering the gas sample to the spectroscopic cell; and (3) a computational assembly (i) including a stored signal-to-noise ratio reference, and a stored background spectrum for the fluid environment when the toxic gas species is not present, and (ii) arranged to analyze the digitized spectrum and responsively produce an output indicative of quantitative presence of the toxic gas species in the fluid environment.

The invention relates to a method for operating a FTIR (Fourier transformation infrared) spectrometer, wherein a validation / calibration of the spectrometer is carried out in cyclically recurring intervals in that by way of at least two temporarily available gases a reference spectrum with a zero gas and also an absorption spectrum with a calibration gas are recorded. The invention further relates to a spectrometer according to the preamble of the patent claims 1 and 8. In order to achieve that at each site of use and at any time a calibration or validation of the spectrometer can be carried out, the invention proposes to use so-called substitute gases during the validation of the spectrometer as gas components, said substitute gases only simulating the actual measured gas component with respect to the metrological properties.

A silicon-nitrogen compound film according to the first aspect of the present invention is made of a material expressed by a compositional formula Si3NxOyHz, where 10≦(3x+2y)≦12, 3.4≦x≦4.0, 0≦y, 0≦z<2.0, the peak-area ratio of a first area of a first peak appearing near a wave number of 2150 cm−1 in a Fourier-transform infrared absorption spectrum of the material and corresponding to a Si—H stretching vibration to a second area of a second peak appearing near a wave number of 810 cm−1 in the Fourier-transform infrared absorption spectrum and corresponding to a Si—N stretching vibration is smaller than 0.2, and the silicon-nitrogen compound film has a thickness t (in nanometers) and a density d (g / cm3) which satisfy the inequalities,1.9≦d≦2.5, and−700d+1930≦6t≦−700d+2530.

The present invention provides a modified polypropylene fiber for treating a glass fiber, giving a molded article remarkably improved in its vibration fatigue strength, a surface-treated glass fiber and fiber-reinforced polypropylene-based resin. This modified polyolefin-based resin for treating the glass fiber is provided with that (1) its amount extracted by boiling methyl ethyl ketone is <=8 mass%, (2) its number-average molecular weight (Mn) measured by a gas permeation chromatography (GPC) is 6,000-48,000 and (3) the amount of added acid measured by a Fourier transform infrared spectroscopy is within 0.1-12 mass% range.

The present invention is a method to determine the cetane number of a diesel fuel containing a fatty acid alkyl ester including determining the infrared spectrum of the fuel and correlating the spectrum to the cetane number using a multivariate-based Mid-FTIR model. The fatty acid alkyl ester may be rapeseed methyl ester and the infrared spectrum includes the frequency ranges 4900-3500 cm−1 and 2200-1624 cm−1 or the frequency ranges 4900-3500 cm−1 2200-1800 cm−1 and 1700-1624 cm−1.

Disclosed is a Fourier transform infrared spectrophotometer, which comprises: a main interferometer section including a beam splitter, a fixed mirror, a movable mirror, and a phase plate disposed between the beam splitter and the fixed mirror; a control interferometer section having a quadrature control system for calculating a position of the movable mirror; a center-burst-position detection section operable, based on an input of interference signals and interferograms, to subject respective intensities of the interferograms to an addition processing while correcting a positional deviation of the movable mirror, so as to obtain a cumulative interferogram, and detecting a center burst position having a maximum intensity value in the cumulative interferogram; a center-burst-position storage section operable to store the detected center burst position; and a measurement-start-position determination section operable, based on the stored center burst position, to determine a measurement start position of the movable mirror during the measurement operation.