Accelerometer system enclosing gas

A method comprising:

• emitting, using a light-emitting device, an optical signal;
• modulating, using a first modulating device of a circuit, the optical signal to produce a first modulated optical signal;
• receiving, using a first photoreceiver of the circuit, the first modulated optical signal;
• converting, using the first photoreceiver, the first modulated optical signal into a first electrical signal;
• processing the first electrical signal to obtain a first processed electrical signal;
• transmitting the first processed electrical signal to the first modulating device, wherein the first modulating device is configured to modulate the optical signal based on the processed electrical signal;
• and
• determining, based on the first processed electrical signal, a frequency value;
• determining, using the circuit, an acceleration value based on the frequency value;
• and
• enclosing, using a housing, the light-emitting device, the circuit, and Helium gas, wherein the Helium gas defines a partial pressure within a range between 0.1 torr and 760 torr.

An accelerometer system comprising:

• a first double-ended tuning fork (DETF) structure;
• a second DETF structure;
• one or more tethers;
• a frame;
• and
• a proof mass suspended within the frame by the first DETF structure, the second DETF structure, and the one or more tethers,
• wherein the proof mass is suspended in a first direction relative to the frame by the first DETF structure and the second DETF structure,
• wherein the first DETF structure contacts a first side of the proof mass and the second DETF structure contacts a second side of the proof mass, the first side being opposite the second side, and
• wherein the proof mass is suspended in a second direction and a third direction relative to the frame by the one or more tethers;
• a light-emitting device configured to emit an optical signal;
• a circuit configured to:
• determine a frequency value corresponding to the optical signal;
• and
• determine an acceleration value based on the frequency value;
• and
• a housing that encloses the light-emitting device, the circuit, and Helium gas, wherein the Helium gas defines a partial pressure within a range between 0.1 torr and 760 torr.