Spectral device
AssigneeKonica Minolta, Inc.
InventorsToru Nakatani, Toshio Kawano, Hitoshi Nagasawa, Koji Nagai
Life of this patent
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Abstract
A spectral device is provided with: a filter having a property of transmitting light of multiple wavelength ranges from a measurement object; a driving means to slide the filter; and a detector to detect an intensity of the light from the measurement object, the light having passed through the filter, the detector to further measure the intensity of the light multiple times sequentially while the driving means slides the filter and thereby obtain multiple pieces of measured data to be used for a calculation of spectral information.
Claims8
A spectral device comprising:
- a filter that changes a spectral transmittance depending on a position, the filter transmitting light of multiple wavelength ranges from a measurement object at any position to make the spectral transmittance allow Hadamard transform spectrometry;
- a driver means that slides the filter;
- and
- a detector to detect an intensity of the light from the measurement object, the light having passed through the filter, the detector to further measure the intensity of the light multiple times sequentially while the driver means slides the filter, thereby obtaining multiple pieces of measured data, and calculate spectral information by Hadamard transform on the basis of the multiple pieces of the measured data,
- wherein the filter has at any position, within a measurement target wavelength region of the detector, two or more discrete wavelength ranges with an 80-percent or more transmittance and three or more discrete wavelength ranges with a 20-percent or less transmittance at any position, the two or more discrete wavelength ranges with an 80-percent or more transmittance being the multiple wavelength ranges that are transmitted by the filter.
A spectral measurement data obtaining method comprising the steps of:
- sliding a filter that changes a spectral transmittance depending on a position, the filter transmitting light of multiple wavelength ranges from a measurement object at any position to make the spectral transmittance allow Hadamard transform spectrometry,
- measuring, by a detector, an intensity of light from a measurement object multiple times sequentially while the filter is slid, the light having passed through the filter, whereby the detector obtains multiple pieces of measured data, and
- calculating spectral information by Hadamard transform on the basis of the multiple pieces of the measured data,
- wherein the filter has at any position, within a measurement target wavelength region of the detector, two or more discrete wavelength ranges with an 80-percent or more transmittance and three or more discrete wavelength ranges with a 20-percent or less transmittance at any position, the two or more discrete wavelength ranges with an 80-percent or more transmittance being the multiple wavelength ranges that are transmitted by the filter.
Dependencies are inferred from the claim text.