Damped fiber optic accelerometers, sensors, and sensor assemblies, and methods of assembling the same
View Patent ↗A fiber optic sensor is provided. The fiber optic sensor includes: a fixed portion configured to be secured to a body of interest; a moveable portion; a spring member positioned at least partially between the fixed portion and the moveable portion; an optical fiber wound in contact with the fixed portion and the moveable portion such that the optical fiber spans at least a portion of the spring; and an elastomeric material provided in contact with at least one of the fixed portion, the moveable portion, the spring member, the body of interest, and the optical fiber.
1. A fiber optic sensor comprising:
a fixed portion configured to be secured to a body of interest;
a moveable portion;
a spring member positioned at least partially between the fixed portion and the moveable portion;
an optical fiber wound in contact with the fixed portion and the moveable portion such that the optical fiber spans at least a portion of the spring; and
an elastomeric material provided in contact with the spring member.
2. The fiber optic sensor of claim 1 further comprising a mass coupled to the moveable portion, the mass configured to move with the moveable portion along at least one motion axis of the moveable portion.
3. The fiber optic sensor of claim 1 wherein the fixed portion, the spring member, and the moveable portion are formed from a unitary piece of material.
4. The fiber optic sensor of claim 1 wherein the moveable portion includes a mass that at least partially surrounds at least one of the spring member or the fixed portion during at least one position within the range of motion of the moveable portion.
5. The fiber optic sensor of claim 1 wherein the elastomeric material is provided in contact with each of the moveable portion, the spring member, and the optical fiber.
6. The fiber optic sensor of claim 1 wherein the elastomeric material surrounds at least one of the moveable portion or the spring.
7. The fiber optic sensor of claim 1 wherein the elastomeric material surrounds each of the moveable portion and the spring.
8. The fiber optic sensor of claim 1 wherein the elastomeric material is provided as at least one solid element during assembly of the fiber optic sensor.
9. The fiber optic sensor of claim 1 wherein the elastomeric material is provided as a fluid during assembly of the fiber optic sensor.
10. The fiber optic sensor of claim 1 wherein the elastomeric material includes a material selected from the group consisting of rubbers, neoprenes, urethanes, epoxies, silicones and viscoelastic materials.
11. The fiber optic sensor of claim 1 wherein the elastomeric material is a viscoelastic material.
12. The fiber optic sensor of claim 1 wherein the fiber optic sensor is a fiber optic accelerometer.
13. A fiber optic sensor assembly comprising:
a fixed portion configured to be secured to a body of interest;
a moveable portion;
a spring member positioned at least partially between the fixed portion and the moveable portion
an optical fiber wound in contact with the fixed portion and the moveable portion such that the optical fiber spans at least a portion of the spring;
an elastomeric material provided in contact with the spring member; and
a housing configured to receive each of the fixed portion, the moveable portion, the spring member, the optical fiber, and the elastomeric material.
14. The fiber optic sensor assembly of claim 13 further comprising a clamping system engaged with the housing, the clamping system including a clamp arm configured to be operated between an extended position and a retracted position during engagement in a wellbore.