Abstract: A system for monitoring and obtaining spectral data from a supercritical fluid process. The system includes a process vessel containing a supercritical fluid, a light source, and a spectrometer. Sampling light emitted by the light source is transmitted into the internal cavity of the process vessel and reflected back to the spectrometer for processing and analysis. The reflected sampling light includes spectral data about the supercritical fluid, thereby allowing process parameters such as the concentration levels of the fluid in the vessel to be generated and monitored for determining the progress of the reaction. Carbon dioxide may be used as the supercritical fluid. In one embodiment, the system may be used in a supercritical fluid textile dyeing process to monitor the progress of the textile colorization.

Abstract: A method for testing the linearity or non-linearity of an actual analyte concentration and a test result, where the actual concentration of the analyte and a test result are determined so that a computation based upon an algorithm may be performed, which allows computation of various variables so that regression may be performed and the linear significance may be determined.

Abstract: An optical cell for spectral analysis is disclosed generally comprising a monolithic cell body that transmits light, the cell body having an outer surface and a fluid channel for receiving a sample that defines an inner surface. The inner surface of said cell body includes a planar section, and the outer surface of said cell body likewise includes a planar section, which is adjacent and substantially parallel to the planar section of the inner surface. In certain embodiments, the ends of the channel are frustoconical, and ferrules are employed to secure sample inlet/outlet tubes to the cell.

Abstract: A method for testing the linearity or non-linearity of an actual analyte concentration and a test result, where the actual concentration of the analyte and a test result are determined so that a computation based upon an algorithm may be performed, which allows computation of various variables so that regression may be performed and the linear significance may be determined.

Abstract: A method for testing the linearity or non-linearity of an actual analyte concentration and a test result, where the actual concentration of the analyte and a test result are determined so that a computation based upon an algorithm may be performed, which allows computation of various variables so that regression may be performed and the linear significance may be determined.

Abstract: A method for testing the linearity or non-linearity of an actual analyte concentration and a test result, where the actual concentration of the analyte and a test result are determined so that a computation based upon an algorithm may be performed, which allows computation of various variables so that regression may be performed and the linear significance may be determined.

Abstract: An optical cell for spectral analysis is disclosed generally comprising a monolithic cell body that transmits light, the cell body having an outer surface and a fluid channel for receiving a sample that defines an inner surface. The inner surface of said cell body includes a planar section, and the outer surface of said cell body likewise includes a planar section, which is adjacent and substantially parallel to the planar section of the inner surface. In certain embodiments, the ends of the channel are frustoconical, and ferrules are employed to secure sample inlet/outlet tubes to the cell.

Abstract: A system for providing and using a gray optical standard is disclosed, the standard generally comprising a housing having a cavity and an at least partially transparent portion adjacent to the cavity for receiving the radiation emitted radiation by an optical instrument and a particulate material disposed in the cavity. The particulate material is a mixture of highly absorptive and highly reflective particles having a diameter of about 20 microns or less. In some embodiments, the at least partially transparent portion of the housing is modified to be highly diffusely scattering in the wavelength region of interest.

Abstract: A method for testing the linearity or non-linearity of an actual analyte concentration and a test result, where the actual concentration of the analyte and a test result are determined so that a computation based upon an algorithm may be performed, which allows computation of various variables so that regression may be performed and the linear significance may be determined.

Abstract: A method for testing the linearity or non-linearity of an actual analyte concentration and a test result, where the actual concentration of the analyte and a test result are determined so that a computation based upon an algorithm may be performed, which allows computation of various variables so that regression may be performed and the linear significance may be determined.

Abstract: A high pressure optical cell for spectrometry is provided. The cell includes a monolithic crystal having a longitudinal bore within. The cell also includes a sheath/housing for holding monolithic crystal and sample introduction tubes. The sample introduction tubes can be microwelded. Compression ferrules or O-rings are used for sealing. A method for making the cell is also provided. A spectroscopic analyzer having a high-pressure optical cell is further provided.

Abstract: A spectroscopic system for measuring content of a constituent in a sample of a natural product is provided. The spectroscopic system includes a source for electromagnetic (EM) radiation and an absorbance filter for filtering EM radiation received from the source, where the absorbance filter transmits EM radiation of predetermined wavelengths solely by the absorbance characteristics of the filter material.