Market profile: CRDS.Cavity Ring-Down Spectroscopy (CRDS CRDS Contribution pour Le Remboursement de la Dette Sociale (French: Social Debt Repayment Contribution) CRDS Cavity Ring-Down Spectroscopy CRDS Community Rehabilitation and Disability Studies ) is an absorption technique used to detect and measure trace amounts of a gas in a sample. Light from a laser enters an optical cavity An optical cavity or optical resonator is an arrangement of mirrors that forms a standing wave cavity resonator for light waves. Optical cavities are a major component of lasers, surrounding the gain medium and providing feedback of the laser light. , where it oscillates between two highly reflective mirrors and decays. The exponential decay Noun 1. exponential decay - a decrease that follows an exponential function exponential return decay, decline - a gradual decrease; as of stored charge or current time, or ring-down time, of the photons is affected by the sample's gas molecules. Using a laser adjusted to the absorption frequency of a specific gas, the concentration of that specific gas within the sample can be measured. CRDS is extremely sensitive and fast, simple to use, does not require calibration and is not affected by laser noise. Developed in the late 1980s, the development of highly reflective mirrors and low cost lasers that require less power has enabled the advancement of the technique to commercial applications. Future commercial applications include breath analysis, environmental monitoring, and remote sensing Deriving digital models of an area on the earth. Using special cameras from airplanes or satellites, either the sun's reflections or the earth's temperature is turned into digital maps of the area. . Current developments are focused on the solid/liquid samples, quantitative measurements, prism-based instruments for simultaneous detection of multiple species and evanescent wave An evanescent wave is a nearfield standing wave exhibiting exponential decay with distance. Evanescent waves are always associated with matter, and are most intense within one-third wavelength from any acoustic, optical, or electromagnetic transducer. CRDS. Drawbacks to the technique are that it is one-dimensional, highly dependent on sample purity, and mirror maintenance. Tiger Optics, a subsidiary of Meeco, has introduced the first commercial gas analyzer utilizing CRDS. The MTO-1000-H20 is a gas analyzer for parts-per-trillion measurements of moisture for ultra-high purity inert, toxic and corrosive corrosive /cor·ro·sive/ (kor-o´siv) producing gradual destruction, as of a metal by electrochemical reaction or of the tissues by the action of a strong acid or alkali; an agent that so acts. gases with applications for semiconductor manufacturing. It can also measure parts per billion ultratrace gas impurities of N[H.sub.3], CO and C[H.sub.4]. Competitor Informed Diagnostics is also developing commercial CRDS instruments, but is concentrating on medical applications. |
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