Controlled interference spectrometer
AssigneeBAH Holdings LLC
InventorConstantine Dean Capetanopoulos
Life of this patent
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Abstract
A spectrometer for determining the concentration of a substance within a sample comprises a. a radiation source (11) for supplying radiation to the sample to be measured; b. a filter (15) for filtering radiation transmitted by the sample, the filter having a number of pass bands at wavelengths corresponding to absorption peaks in the absorption spectrum of the sample to be detected, the filter being responsive to an applied signal to modulate the wavelengths of the pass bands; and, c. a detector (16) for detecting the filtered radiation, the detector being responsive to the applied signal to determine the relative intensities of the maxima and minima in the absorption spectra of the substance, characterized in that the radiation source is selectively activated in response to the applied signal.
Claims23
A spectrometer for determining the concentration of a substance within a sample, the spectrometer comprising:
- a. a radiation source for supplying radiation to the sample to be measured;
- b. a filter for filtering radiation transmitted by the sample, the filter having a number of pass bands at wavelengths corresponding to absorption peaks in the absorption spectrum of the sample to be detected, the filter being responsive also to a separate applied signal to modulate the wavelengths of the pass bands;
- and,
- c. a detector for detecting the filtered radiation, the detector being responsive to the applied signal to determine the relative intensities of the maxima and minima in the absorption spectra of the substance, characterized in that the radiation source is selectively activated in response to said separate applied signal.
A spectrometer for detecting the concentration of a substance within a sample, the spectrometer comprising:
- a. a reference cell containing a quantity of the substance;
- b. a sample cell for containing the sample in use;
- c. a radiation source for supplying radiation to the reference cell and the sample cell;
- d. first and second filters for filtering radiation transmitted by the reference and sample cells respectively, each filter having a number of pass bands and being responsive to a common applied signal to modulate the wavelengths of the pass bands;
- e. first and second detectors for detecting the filtered radiation from the first and second filters respectively, the detectors being responsive to the applied signal to measure the intensity of the filtered radiation;
- and,
- f. a processor responsive to the first detector for controlling the common applied signal.
Dependencies are inferred from the claim text.