US 6,208,413 B1Granted

Hadamard spectrometer

AssigneeInstitut fuer Physikalische Hochtechnologie e.V.

InventorsTorsten Diehl, Norbert Lenk, Rainer Riesenberg, Jürgen Schöneich

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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 ≧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.

Claims20

Dependent claims

A Hadamard spectrometer comprising:

a luminating unit, having a row of n luminous sources controllable according to the Hadanard-principle wherein n is greater than or equal to three, said luminous sources being separate from and adjacent one another,
an imaging grating arranged to receive light from a direction of said luminous sources,
a detecting unit including a detector row of detecting elements, said detecting elements being separate from one another and arranged at a distance a from one another, said detecting unit being arranged to receive light beams from said imaging grating,
a receptacle for receiving samples to be spectrally analyzed interposed between said luminating unit and said imaging grating, and
electronic units coupled to said ruminating unit and said detecting unit for performing a Hadamard-transformation and for signal detection and signal evaluation,
said luminous sources being arranged relative to one another such that an edge of each of said luminous sources is spaced a distance b from the corresponding edge of adjacent ones of said luminous sources, the distance b being set so that, when imaged upon said detector row, the distance b amounts to an integral multiple of a plus a/n or minus a/n.

3 more elements

Dependencies are inferred from the claim text.