Recording a spectrally resolved image by reading out several partial arrays in a plurality of interferometer scans
First Claim
1. A method for acquisition of a spectrally resolved, two-dimensional image by means of Fourier transform (=FT) spectroscopy or Fourier transform infrared (=FTIR) spectroscopy, the method comprising the steps of:
- a) feeding light to an interferometer, thereby splitting the light into two partial beams;
b) changing an optical path difference between the two partial beams, thereby traversing an identical range several times;
c) detecting the light with a two-dimensional array detector;
d) reading out different subsets of detector elements of the array detector during multiple passes of the optical path difference between the two partial rays over the identical range as generated in step b); and
e) Fourier transforming and combining signals of read-out detector elements of the multiple passes to form the spectrally resolved image.
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Abstract
A method for the acquisition (AU) of a spectrally resolved, two-dimensional image by means of Fourier transform (=FT) spectroscopy or Fourier transform infrared (=FTIR) spectroscopy, is characterized in that, during multiple passes (D1-D4) of an optical path difference (OG) between two partial rays (14a, 14b) over an identical range (IB), different subsets of detector elements (22) of an array detector (5) are read out and the signals of the read-out detector elements (22) of the multiple passes (D1-D4) are Fourier transformed and combined to form the spectrally resolved image. A method is thereby provided for the acquisition of two-dimensional, spectrally resolved images, in which the influence of vibrations on the measurement is reduced, and which is less affected by the movement of objects to the resolved spectrally.
22 Citations
16 Claims
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1. A method for acquisition of a spectrally resolved, two-dimensional image by means of Fourier transform (=FT) spectroscopy or Fourier transform infrared (=FTIR) spectroscopy, the method comprising the steps of:
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a) feeding light to an interferometer, thereby splitting the light into two partial beams; b) changing an optical path difference between the two partial beams, thereby traversing an identical range several times; c) detecting the light with a two-dimensional array detector; d) reading out different subsets of detector elements of the array detector during multiple passes of the optical path difference between the two partial rays over the identical range as generated in step b); and e) Fourier transforming and combining signals of read-out detector elements of the multiple passes to form the spectrally resolved image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An FT or FTIR spectrometer, the spectrometer comprising:
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an interferometer having an optical path device for changing an optical path difference between two partial beams of light supplied to said interferometer; a two-dimensional array detector; an electronic control unit, said electronic control device structured to control said optical path device in order to traverse an identical range of said optical path difference several times, said electronic control unit further structured to read out detector elements of said two-dimensional array detector, wherein said electronic control unit is programmed for acquisition of an individual, spectrally resolved, two-dimensional image in response to multiple passes of optical path difference changes through said identical range, thereby reading out different subsets of detector elements of said array detector; and a computing unit structured to Fourier transform signals read-out of said detector elements and obtained during said multiple passes, said computing unit also structured to combine said signals into a spectrally resolved image. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification