To provide a system for measuring differential pressure capable of correcting luminous energy modulation of irradiation light, and capable of measuring precisely the differential pressure.
This system includes a light source 4, the first sensor 5 for attenuating a light intensity in the first wavelength band shifted in response to the first external pressure Po1 to be output as the first measured light, in a spectrum of the irradiation light emitted from the light source 4, the second sensor 15 for attenuating a light intensity in the second wavelength band shifted in response to the second external pressure Po2 to be output as the second measured light, in a spectrum of the first measured light, a correction module 71A for calculating correction luminous energy of negating the modulation of the luminous energy of the second measured light, with the modulation of the luminous energy of the irradiation light, and a measuring module 72A for measuring the differential pressure between the first pressure and the second external pressure.
Iwa Saki Kokuni
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu