Hadamard spectrometer
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United States of America Patent
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Mar 27, 2001
Grant Date -
N/A
app pub date -
Sep 10, 1999
filing date -
Mar 13, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a Hadamard spectrometer which enables the detection of a range of polyatomic gases or liquids for example using infrared absorption. The aim of the invention is to produce a spectrometer of this type which provides higher resolution, improved wavelength precision and an improved signal-to-noise ratio using conventional detector lines and which allows a small and compact design. To this end, a detector line (30) with a set interval (a) between the individual detector areas (31) is used for a detector unit (3), and a linear assembly (10) is also used for a light-emitting respective reflective assembly (1). The linear assembly includes (n) adjoining identical light sources (11, 12, 13, 14), n always remaining .gtoreq.3, which can be activated individually according to the Hadamard Principle. The individual light sources (11, 12, 13, 14) are positioned at an interval (b) from each other in such a way that b is an integral multiple of a plus or minus 1/n when they are projected onto the detector line.
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