Opto-electronic measuring device with optical air wedge spectral analysis arrangement

A pressure measuring device, comprising a light source with a wide spectrum feeding an optical sensor through an optical fiber, said optical sensor comprising an interferometer adjusted to a dull tint, an optical component sensitive to a measured pressure P and introducing in the interferometer a path difference depending on the measured pressure P, an optical fiber connection connecting the sensor to means for reading out the spectrum of the light flux leaving the interferometer, said means for reading out consisting of a photodetector, a processing unit, and an optical air wedge being formed by two flat plates being positioned at a slight angle with respect to each other to produce fringes, whose lateral position and contrast are representative of the spectrum of the light flux leaving the interferometer and analyzed by the photodetector, the processing unit measuring the lateral position of said fringes and converting lateral position into the value of pressure P.

A measuring device comprising a light source with a wide spectrum feeding an optical sensor through an optical fiber, said optical sensor comprising a Fizeau interferometer adjusted to a dull tint, said Fizeau interferometer having two faces with each face having a reflectivity coefficient, an optical component sensitive to a measured parameter P and introducing in the interferometer a path difference depending on the measured parameter P, an optical fiber connection connecting the sensor to means for reading out the spectrum of the light flux leaving the interferometer, said means for reading out consisting of a photodetector a processing unit and an optical air wedge being formed by two fiat plates being positioned at a slight angle with respect to each other to produce fringes, each of said flat plates of the air wedge having a reflectivity coefficient which is respectively equal to the reflectivity coefficient of one face of the Fizeau interferometer, the lateral position and contrast of the fringes being representative of the spectrum of the light flux leaving the interferometer and analyzed by the photodetector, the processing unit measuring the lateral position of said fringes and convening said lateral position into the value of parameter P.

A pressure measuring device comprising a light source with a wide spectrum feeding an optical sensor through an optical fiber, said optical sensor comprising a Fizeau interferometer adjusted to a dull tint, said Fizeau interferometer having two faces with each face having a reflectivity coefficient, an optical component sensitive to a measured pressure P and introducing the interferometer a path difference depending on the measured pressure P, an optical fiber connection connecting the sensor means to means for reading out the spectrum of the light flux leaving the interferometer, said means for reading out consisting of a photodetector, a processing unit and an optical air wedge being formed by two flat plates being positioned at a slight angle with respect to each other to produce fringes, each of said flat plates of the air wedge having a reflectivity coefficient which is respectively equal to the reflectivity coefficient of one face of the Fizeau interferometer, the lateral position and contrast of the fringes being representative of the spectrum of the light flux leaving the interferometer and analyzed by the photodetector, the processing unit measuring the lateral position of said fringes and converting said lateral position into the value of pressure P.