Differential optoacoustic absorption detector
Patent 4067653 Issued on January 10, 1978. Estimated Expiration Date: 
January 10, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 10, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesNovel photometric system Infrared laser detector employing a pressure controlled differential optoacoustic detector Patent #: 4019056 InventorsApplicationNo. 05/718266 filed on 08/27/1976US Classes:356/433, By comparison250/344, Plural series signalling means356/246, Fluid containers (e.g., cells or cuvettes)356/439ContainedExaminersPrimary: Corbin, John K.Assistant: Rosenberger, R. A. Attorney, Agent or FirmInternational ClassG01N 21/17 (20060101)AbstractA differential optoacoustic absorption detector employs two tapered cells in tandem or in parallel. When operating in tandem, two mirrors are used at one end remote from the source of the beam of light directed into one cell back through the other, and a lens to focus the light beam into the one cell at a principal focus half way between the reflecting mirror. Each cell is tapered to conform to the shape of the beam so that the volume of one is the same as for the other, and the volume of each receives maximum illumination. The axes of the cells are placed as close to each other as possible in order to connect a differential pressure detector to the cells with connecting passages of minimum length. An alternative arrangement employs a beam splitter and two lenses to operate the cells in parallel.Other References
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