Abstract:
A detector device for optically detecting a gas in a zone of space under observation, the device comprising a camera and means for continuously detecting at least one gas in the observed zone by analyzing absorbance in a plurality of different spectral bands. The device further comprises a matrix of micromirrors that are individually steerable between at least two positions, in a first of which they reflect the radiant flux coming from the observed zone to the camera for detecting gas in said spectral bands, and in a second of which they reflect the radiant flux coming from the observed zone to a Fourier transform infrared spectroscope.
Abstract:
A spectrometric measurement device capable of determining an optimal wavelength for detecting an objective component is provided. One mode of the present invention is a fluorescence measurement device for casting an excitation light of a predetermined wavelength into or onto a sample and detecting a predetermined wavelength of light contained in the fluorescence generated from the sample irradiated with the excitation light.
Abstract:
The present invention relates to a head (500) for a sensor comprising two sections of optical fiber enabling the propagation of infrared light having at least one infrared wavelength and generating evanescent waves toward the outside in order to detect infrared signatures of an external medium, said head (500) comprising: an optical fiber forming a curved portion (15) for connecting the two sections of fiber, and for coming into contact with the external medium so as to detect the infrared signatures interfering with the propagation of the evanescent waves propagating along the fiber, and means (504, 506) for protecting the curved portion (15) against external mechanical stress, while ensuring that a contact area (30) exists between the external medium and said curved portion (15).
Abstract:
A thermal imaging system includes at least one light source in the line of sight of at least one substance of interest. At least one thermal imager is in the line of sight of the substance of interest and is associated with the light source. The light source is configured to selectively transmit infrared wavelengths in the range of about 2 to 25 microns to irradiate the substance of interest. The thermal imager is configured to detect thermal responses of the irradiated substance of interest.
Abstract:
In an endoscope system, rays of different wavelength bands are sequentially projected toward a target site of a test subject, to obtain image signals from the reflected rays. Reflection spectra are calculated from the image signals and subjected to a multi-regression analysis in combination with absorption spectra of those objects which are relevant to the inspection, such as blood or hemoglobin in the target site, and absorption spectra of irrelevant objects other than the relevant objects, such as bile or staining materials. Spectral components of the irrelevant objects in the reflection spectra are determined through the multi-regression analysis, and are eliminated from the reflection spectra, providing second reflection spectra. A couple of images are produced and displayed on the basis of the first reflection spectra from which the spectral components of the irrelevant objects are not eliminated and the second reflection spectra.
Abstract:
Methods and optical detection systems (200, 300, 800, 900) for generating and processing a real-time time-domain cavity ringdown spectroscopy (CRDS) signal (831, 931) from an absorbing species in an optical detection system (200, 300, 800, 900) having an optical ringdown cavity (200, 300) are disclosed. The optical ringdown cavity (200, 300) is adapted for accepting a sample of an absorbing species. One or more modulated light signals (241,243,245,341) are generated using one or more light sources (240, 242, 244, 340). The light source(s) (240, 242, 244, 340) is pulsed at a specified pulse rate(s). The modulated light signal(s) (241,243,245, 341) is resonated using the optical ringdown cavity (200, 300) comprising a plurality of mirrors (220, 230), or sets of mirrors (320, 330), to produce the CRDS signal (831, 931). The reflectivity of the mirrors (220, 230), or sets of mirrors (320, 330), is dependent upon the pulse rate of the modulated light signals (241,243,245,341). Different beamlines (212, 214, 216, 312, 314, 316) are established by the modulated light signal(s) (241,243,245, 341) and the mirrors (220, 230, 320, 330) interacting with the absorbing species sample.
Abstract:
Smart fiber optic sensors, systems, and methods for performing quantitative optical spectroscopy are disclosed. In one embodiment, smart fiber optic sensor can include a sensing channel, a calibration channel, and a pressure sensing channel. External force or pressure can be calculated at pressure sensing channel for monitoring and controlling pressure at a sensor-specimen interface thereby ensuring more accurate specimen spectral data is collected. Contact pressure can be adjusted to remain within a specified range. A calibration light of the calibration channel and an illumination light of the sensing channel can be generated simultaneously from a shared light source. Pressure sensing channel can transmit light from a second light source and collect pressure spectral data.
Abstract:
Apparatus and method for the determination of weight fractions of hydrocarbons, water and acid in the acid catalyst phase of petroleum refinery alkylation catalyst streams by flowing the acid catalyst phase through a density detector and a spectrometer cell so that the determination can be made according to first principles. An alternative apparatus and method uses spectroscopy without the density detector.
Abstract:
A method and apparatus for spectrophotometric in vivo monitoring of blood metabolites such as hemoglobin oxygen concentration at a plurality of different areas or regions on the same organ or test site on an ongoing basis, by applying a plurality of spectrophotometric sensors to a test subject at each of a corresponding plurality of testing sites and coupling each such sensor to a control and processing station, operating each of said sensors to spectrophotometrically irradiate a particular region within the test subject; detecting and receiving the light energy resulting from said spectrophotometric irradiation for each such region and conveying corresponding signals to said control and processing station, analyzing said conveyed signals to determine preselected blood metabolite data, and visually displaying the data so determined for each of a plurality of said areas or regions in a comparative manner.
Abstract:
A spectrophotometer has a specimen cell; a light source unit for emitting light to the specimen cell; a photodetector for detecting the light that passed through the specimen cell; a light-shielding unit for blocking the light from impinging on the photodetector at predetermined periods; a memory unit for storing output strength signals detected by the photodetector; and a controller for calculating transmittance or absorbance based on output strength signal S of the incidence duration and output strength signal DS of the light-blocked duration stored in the memory unit. The incidence duration and light-blocked duration occur in this sequence in a single period. The controller calculates the true output strength signal sN of the Nth period removed of the effects of output strength signal SN−1 of the incidence duration of the (N−1)th period that are included in the output strength signal SN of the incidence duration of the Nth period.