초록

The slit assembly of the present spectrometer comprises a liquid crystal cell. The electrodes of the cell are selectively actuated for producing a pattern of slits appropriate to the spectral lines of interest in the spectrum derived from the substance under analysis.

대표청구항 ▼

In a spectrographic analysis system in which a spectrum derived from a sample under test in projected onto a slit assembly, the assembly including slits positioned to pass only those spectral lines of interest in the measurement of the concentration of one of a number of different substances which m

In a spectrographic analysis system in which a spectrum derived from a sample under test in projected onto a slit assembly, the assembly including slits positioned to pass only those spectral lines of interest in the measurement of the concentration of one of a number of different substances which may be present in the sample, the improvement comprising: said slit assembly comprising a liquid crystal cell with electrodes at opposite surfaces of the cell for defining the slits in response to voltages applied thereto; and control means connected to said slit assembly for applying voltages to said electrodes for producing a selected one of a plurality of possible slit patterns, that one pattern being appropriate to the analysis of the particular substance of interest in the sample, said control means including modulating means for generating a slit modulating signal and for applying said slit modulation signal to a selected group of said slits to generate a modulated selected spectrum for opening the slits at the modulation frequency, and output means including detecting means for detecting said modulated spectrum, and means responsive to said detected modulated spectrum applied as an input thereto for generating said spectrum signal as an output thereof.