Title:
SPECTROPHOTOMETRIC APPARATUS WITH WAVELENGTH CALIBRATING FUNCTION
Document Type and Number:
Japanese Patent JPH04106430
Kind Code:
A
Abstract:
PURPOSE:To achieve a prevention of erroneous recognition of bright lines as caused by stray light and noises along with higher light and color measuring accuracy by determining a regression line of addresses and wavelengths of elements using bright line radiations with a plurality of wavelengths to set wavelength of center of gravity for the addresses. CONSTITUTION:A plurality of specified bright lines to be obtained from a bright line radiation source are introduced to a spectrophotometric device to determine addresses by a maximum address detection means 10 corresponding to theoretical positions of elements of a silicon photodiode array 7 at which maximum photoelectric output are obtained with respect to the respective bright lines from a line dispersion of a spectrophotometric device beforehand. Elements are determined so as to maximize the photoelectric outputs with respect to the bright lines among those near the addresses and the photoelectric outputs are integrated before and after the elements centered thereon with the addresses of the elements as weight coefficient with respect to the elements within a range doubling a mechanical width of a transmission band of the spectrophotometric device. The results are divided by the values of the photoelectric outputs obtained by integration using the weight coefficient 1 in the manner as mentioned above to determine addresses of the array 7 for the respective bright lines and the wavelength of center of gravity of the elements of the array 7 is obtained by a wavelength of center of gravity calculating means 11 from a regression line of the wavelengths of the bright lines and the addresses of the array 7 corresponding thereto.
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Inventors:
OKUBO KAZUAKI
SUZUKI KENICHI
SUZUKI KENICHI
Application Number:
JP22705890A
Publication Date:
April 08, 1992
Filing Date:
August 28, 1990
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G01J3/36; G01J3/28; (IPC1-7): G01J3/36
Domestic Patent References:
| JPS5548624A | 1980-04-07 | |||
| JPS63295935A | 1988-12-02 |
Attorney, Agent or Firm:
Tomoyuki Takimoto