Fourier transform spectrometer using a multielement liquid cryst

Details Fourier transform spectrometer using a multielement liquid cryst Fourier transform spectrometer using a multielement liquid cryst

1997-05-29

2000-02-29

Kim, Robert H.

Optics: measuring and testing

By dispersed light spectroscopy

With aperture mask

356308, 356330, G01J 304

Patent

active

060316098

ABSTRACT:
Fourier transform spectrometer using a multielement liquid crystal display. A ferroelectric liquid crystal mask is used as an optical encoder for a solid-state Fourier transform spectrometer. A 1.times.64 element array was striped and used as a 1.times.4 element device. The device intersected dispersed radiation and encoded each spectral component thereof with a carrier signal by applying half-wave potentials to each of the four striped (1.times.16) liquid crystal elements which varied the transmitted amplitude of the light from 0.03% to 28% of full scale. The light was spectrally recombined and imaged onto a photomultiplier and the resulting carrier frequencies (and their amplitudes) detected by Fourier transformation of the time-varying signal. Spectra of colored-glass filters were taken to demonstrate the spectrometer.

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Hammaker et al., "Hadamard Transform Raman Spectrometry," Modern Techniques in Raman Spectroscopy, Edited by J.J Laserna, John Wiley and Sons, Ltd. (1996), pp. 143-161, 216-225.
Radek Sobczynski et al., "Diode Arrays May Light Up Compact Spectrometers," Laser Focus World, Mar. 1995, pp. 75-81.

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