Patent ID: 11885680
Assignee: KONICA MINOLTA, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. 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.