250 results about "Spectrophotometric measurement" patented technology

A method and system for characterizing asphaltene gradients of a reservoir of interest and analyzing properties of the reservoir of interest based upon such asphaltene gradients. The analysis employs a correlation that relates insoluble asphaltene concentration to spectrophotometry measurement data measured at depth.

A clip-style sensor is provided that includes a sliding clip, such as a flat spring that slides along the sensor to provide a closing force for the sensor. When the sliding clip is engaged, the sensor is secured to the patient. The sensor may be placed on a patient's finger, toe, ear, and so forth to obtain pulse oximetry or other spectrophotometric measurements.

The invention discloses a high-sensitivity enzyme-linked immunoassay method. The method comprises the following steps of: according to a characteristic of specific binding of a measured object and an antibody (antigen), marking the antigen or the antibody and the corresponding antibody or antigen by a corresponding enzyme under a specific condition so as to achieve an absorption combination process, and indirectly representing the concentration of the measured object by the catalytic speed of the marked enzyme about a substrate. According to the high-sensitivity enzyme-linked immunoassay method provided by the invention, a problem of insufficient sensitivity of a regular enzyme-linked immunoassay based on a spectrophotometry is effectively overcome, and the high-sensitivity chemical oscillation dynamics detection and enzymatic dynamics analysis with specificity and flexibility amplification action are combined by utilizing an antibody-antigen specificity combination principle, so that the problems of low chemical oscillation selectivity and incapability of carrying out qualitative determination are overcome, thus the chemical oscillation in combination with the enzyme-linked immunoassay method can be used for qualitative and quantitative determination of substances such as medicine and pesticide micromolecules, antibody, antigen, specific protein, nucleic acid, disease factors and the like.

A method and apparatus for non-invasively determining a blood oxygen saturation level within an organ of a subject using direct application of a near infrared spectrophotometric sensor is provided. The method includes the steps of: a) transmitting a light signal directly into the subject's organ using the sensor; b) sensing a first intensity of the light signal and a second intensity of the light signal, after the light signal travels a predetermined distance through the organ of the subject; c) determining an attenuation of the light signal along multiple different wavelengths using the sensed first intensity and sensed second intensity; d) determining a difference in attenuation of the light signal between wavelengths; and e) determining the blood oxygen saturation level within the subject's organ using the difference in attenuation between wavelengths.