Optomechanial gravimeter

An optomechanical gravimeter comprising:

• a gravimetry axis;
• a first accelerometer disposed along the gravimetry axis and that measures a first acceleration of the first accelerometer;
• a second accelerometer disposed along the gravimetry axis opposing the first accelerometer and that measures a second acceleration of the second accelerometer;
• and
• a spacer member disposed along the gravimetry axis and interposed between the first accelerometer and the second accelerometer such that the spacer member is in mechanical communication with the first accelerometer and the second accelerometer,
• the first accelerometer and the second accelerometer independently comprising:
• a basal member;
• a test mass disposed on the basal member;
• a flexural member interposed between the basal member and the test mass such that the test mass is moveably disposed on the basal member via flexing of the flexural member;
• an armature disposed on the basal member and opposing the test mass and the flexural member such that:
• the armature is spaced apart from the test mass, and
• the basal member and the armature are subject to identical displacement;
• a cavity comprising:
• a first mirror disposed on the test mass;
• a second mirror disposed on the armature and in optical communication with the first mirror;
• An optical coupler in optical communication with the second mirror and that provides laser light to the cavity;
• and
• a cavity length comprising a distance between the first mirror and the second mirror,
• the first accelerometer further comprising:
• a first displacement axis that is collinear with the test mass of the first accelerometer and the cavity of the first accelerometer, the test mass of the first accelerometer being displaced along the first displacement axis in response to flexing of the flexural member of the first accelerometer;
• and
• a first measurement point disposed on the test mass of the first accelerometer along the first displacement axis;
• the second accelerometer further comprising:
• a second displacement axis that is collinear with the test mass of the second accelerometer and the cavity of the second accelerometer, the test mass of the second accelerometer being displaced along the second displacement axis in response to flexing of the flexural member of the second accelerometer;
• and
• a second measurement point disposed on the test mass of the second accelerometer along the second displacement axis;
• the spacer member providing a substantially constant distance of separation between the first measurement point of the first accelerometer and the second measurement point of the second accelerometer.