All-optical system responsive to motion and optical module for use in the same

An optical module for use in a motion responsive system, the optical module comprising:

• a support;
• a proof mass mechanically coupled and displaceable relative to the support along at least one sensing axis in response to a motion experienced by the support;
• an optical monitoring assembly comprising a light entry interface mounted on the proof mass and a light exit interface, the optical monitoring assembly monitoring the proof mass with an optical beam projected from the light entry interface and comprising a plurality of dedicated spectral components, and
• an optical spectral filter fixed with respect to the support and positioned in a path of the optical beam, the optical spectral filter comprising a plurality of filtering regions, each filtering region being associated with a corresponding one of the plurality of dedicated spectral components of the optical beam and having a spectral profile comprising a distinct dedicated filtering band encompassing the corresponding dedicated spectral component, such that a displacement of the proof mass along the at least one sensing axis produces, after filtering of the optical beam by the optical spectral filter, a change in the optical power of at least one of the plurality of dedicated spectral components, the change being indicative of the motion experienced by the support.

An optical module for use in a motion responsive system, the optical module comprising:

• a support;
• a first proof mass mechanically coupled and displaceable relative to the support along two mutually orthogonal first and second sensing axes in response to a motion experienced by the support;
• a second proof mass mechanically coupled and displaceable relative to the support along a third sensing axis in response to the motion experienced by the support, the third sensing axis being orthogonal to both the first and second sensing axes;
• an optical monitoring assembly fixed relative to the support for monitoring the first and the second proof masses with corresponding first and second optical beams impinging respectively on the first and the second proof masses, the first and second optical beams comprising respectively four and two dedicated spectral components;
• a first optical spectral filter positioned in a path of the first optical beam, the first optical spectral filter comprising four filtering regions, each filtering region being associated with a corresponding one of the four dedicated spectral components of the first optical beam and having a spectral profile comprising a distinct dedicated filtering band encompassing the corresponding dedicated spectral component, such that a displacement of the first proof mass along the first and second sensing axes produces, after filtering of the first optical beam by the first optical spectral filter, a change in the optical power of at least one of the four dedicated spectral components of the first optical beam, the change being indicative of the motion experienced by the support along at least one of the first and second sensing axes;
• and
• a second optical spectral filter positioned in a path of the second optical beam, the second optical spectral filter comprising two filtering regions, each filtering region being associated with a corresponding one of the two dedicated spectral components of the second optical beam and having a spectral profile comprising a distinct dedicated filtering band encompassing the corresponding dedicated spectral component, such that a displacement of the second proof mass along the third sensing axis produces, after filtering of the second optical beam by the second optical spectral filter, a change in the optical power of at least one of the two dedicated spectral components of the second optical beam, the change being indicative of the motion experienced by the support along the third sensing axis.

An optical motion responsive system comprising:

• a support;
• a proof mass mechanically coupled and displaceable relative to the support along at least one sensing axis in response to a motion experienced by the support;
• an optical monitoring assembly comprising a light entry interface and a light exit interface, the optical monitoring assembly being fixed relative to the support for monitoring the proof mass with an optical beam impinging on the proof mass, the optical beam comprising a plurality of dedicated spectral components;
• a light source assembly optically coupled to the optical monitoring assembly, the light source assembly generating the optical beam and projecting the same onto the proof mass via the light entry interface;
• an optical spectral filter positioned in a path of the optical beam, the optical spectral filter comprising a plurality of filtering regions, each filtering region being associated with a corresponding one of the plurality of dedicated spectral components of the optical beam and having a spectral profile comprising a distinct dedicated filtering band encompassing the corresponding dedicated spectral component;
• and
• an optical detector assembly for measuring an optical power of each dedicated spectral component of the optical beam after incidence of the optical beam onto the proof mass and collection of the same via the light exit interface, such that a displacement of the proof mass along the at least one sensing axis produces, after filtering of the optical beam by the optical spectral filter, a change in the optical power of at least one of the plurality of dedicated spectral components, the change being indicative of the motion experienced by the support.