Title:
LIGHT APPLIED MEASUREMENT METHOD
Document Type and Number:
Japanese Patent JPH04332817
Kind Code:
A
Abstract:
PURPOSE:To measure an amount to be measured without being influenced by light transmission loss. CONSTITUTION:A light modulation part 12 comprising a light emitting part 11, a polarizer 23, a birefringence element 22 and a light detector 24, a light receiving part 13 and a measuring part 14 are provided. The light emitting part 11 is equipped with a light emission source 15 for generating light of wavelength lambda1 and a light emission source 16 for generating light of wavelength lambda2. The light receiving part 13 separately receives a light output of wavelength lambda1 and a light output of wavelength lambda2 generated by the light modulation part 12. The measuring part 14 calculates a ratio of light outputs of both wavelengths and calculates an amount to be measured from relation between the ratio in light outputs and the amount to be measured. A range of the amount where the light output to be a numerator of the ratio shows a large change while the light output to be a denominator of the ratio shows a slight change in the vicinity of the maximum value is specified to be a measurement range.
Inventors:
YOSHINO TOSHIHIKO
KANEMAN NAOHIRO
SAITO MUNECHIKA
KANEMAN NAOHIRO
SAITO MUNECHIKA
Application Number:
JP10259991A
Publication Date:
November 19, 1992
Filing Date:
May 08, 1991
Export Citation:
Assignee:
YOSHINO TOSHIHIKO
NISSIN ELECTRIC CO LTD
NISSIN ELECTRIC CO LTD
International Classes:
G01D5/26; G01L1/24; G01L11/00; G01R15/24; G01R33/032; (IPC1-7): G01D5/26; G01L1/24; G01L11/00; G01R15/07; G01R33/032
Attorney, Agent or Firm:
Hidetoshi Matsumoto