Patent
Automated acousto-optic infrared analyzer system
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TLDR
In this article, an automated acousto-optic tunable filter infrared analyzer system is proposed for a variety of industrial and commercial control applications, which relies upon a narrow band pass tunable ACO filter which is selectively tuned by predetermined rf frequency signals to selectively transmit the narrowband pass of interest which corresponds to a specific molecular species for identification and analysis.Abstract:
An automated acousto-optic tunable filter infrared analyzer system useable in a variety of industrial and commercial control applications. The system relies upon a narrow band pass tunable acousto-optic filter which is selectively tuned by predetermined rf frequency signals to selectively transmit the narrow band pass of interest which corresponds to a specific molecular species for identification and analysis. The system includes a microcomputer and associated memory function to measure and compare detected signals from an infrared detector which converts the filtered infrared signal to an electrical signal. The memory provides control signals for the computer and for controlling the sequence and frequency of rf energy applied to tune the filter. In this way, the near to mid range infrared can be analyzed for absorption bands corresponding to predetermined molecular species such as combustion product gases, and a feedback signal generated to control the combustion process.read more
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References
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Journal ArticleDOI
Acousto-Optic Tunable Filter
Stephen E. Harris,R. W. Wallace +1 more
TL;DR: In this paper, the authors proposed a lithium niobate optical filter utilizing collinear acousto-optic diffraction in anisotropic medium, which was shown to be tunable.
Patent
Infrared gas analysis
TL;DR: In this article, a method and apparatus for detecting and quantitatively measuring a molecular species of gaseous material in a sample to be analyzed is provided, where light containing incoherent infrared radiation is collected, collimated and transmitted by a light conditioning means to a primary filtering means.
Patent
Infrared imaging device using a pyroelectric image tube
TL;DR: In this paper, a pyroelectric imaging tube is shifted relative to the observed scene and the infrared image on the target is read in a line by line scan the direction of the line being perpendicular to that in which the image is shifted.
Journal ArticleDOI
Laser detection utilizing tunable acoustooptic filters
TL;DR: In this article, a frequency modulated tunable acoustooptic filters were used to detect CW laser radiation in the presence of an incoherent background irradiance of 0.1 W/cm2.
Patent
Infrared absorption spectroscopy employing an optoacoustic cell for monitoring flowing streams
TL;DR: In this article, an infrared laser optoacoustic spectrometer is acoustically isolated from a flowing stream to be analyzed, such as the output stream of a retention time chromatograph, by means of mufflers disposed upstream and downstream of the optical cell.