Differential pressure measuring system and differential pressure measuring method
AssigneeYamatake Corporation
InventorSeiichiro Kinugasa
Life of this patent
Estimating the term…
Abstract
A differential pressure measuring system includes a light source for emitting a light, a first transducer for attenuating the intensity of the emitted light in a first range, depending on a first pressure, and providing a first light, a second transducer for attenuating the intensity of the first light in a second range, depending on a second pressure, and providing a second light, a feedback circuit for adjusting the intensity of the emitted light to maintain the intensity of the second light in the second range constant, and a measuring module for measuring a differential pressure between the first and second pressures, based on the intensities of the second light in the first and second ranges.
Claims16
A differential pressure measuring system comprising:
- a light source configured to emit an emitted light;
- a first transducer configured to attenuate an intensity of the emitted light in a first wavelength range, depending on a first external pressure to be applied, and to provide a first measurement light;
- a second transducer configured to attenuate an intensity of the first measurement light in a second wavelength range, depending on a second external pressure to be applied, and to provide a second measurement light, the second wavelength range being different from the first wavelength range;
- and
- a ratio-based measuring module configured to measure a differential pressure between the first external pressure and the second external pressure, based on a ratio of one of intensities of the second measurement light in the first and second wavelength ranges to another one of the intensities of the second measurement light in the first and second wavelength ranges.
A differential pressure measuring method comprising:
- emitting an emitted light;
- attenuating an intensity of the emitted light in a first wavelength range, depending on a first external pressure, to provide a first measurement light;
- attenuating an intensity of the first measurement light in a second wavelength range, depending on a second external pressure, to provide a second measurement light, the second wavelength range being different from the first wavelength range;
- and
- measuring a differential pressure between the first external pressure and the second external pressure, based on a ratio of one of intensities of the second measurement light in the first and second wavelength ranges to another one of the intensities of the second measurement light in the first and second wavelength ranges.
Dependencies are inferred from the claim text.