# US 2014/0153884 A1 · Fiber optic strain locking arrangement and method of strain locking a cable assembly to tubing

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- Number: US 2014/0153884 A1
- Document ID: US20140153884A1
- Status: Published application
- Kind: A1
- Application number: 13/690,062
- Filed: 2012-11-30
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: Baker Hughes Incorporated
- Inventors: Carl W. Stoesz
- Web page: https://patentgrep.com/patent/US20140153884A1

## CPC

- G02B 6/443: {Protective covering}
- G01L 1/242: {the material being an optical fibre}
- G02B 2006/12138: {Sensor}
- Y10T 29/49826: Assembling or joining
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A fiber optic strain locking arrangement includes a cable assembly having an outer radial surface, an optical fiber strain transmissively coupled to the outer radial surface, and tubing disposed at the outer radial surface. The tubing is strain locked to the outer radial surface through at least one of interference fit with granules at least partially embedded into at least one of the tubing and the outer radial surface and adhesive bonding to both the tubing and the outer radial surface.

## Claims

### Claim 1

A fiber optic strain locking arrangement comprising:
a cable assembly having an outer radial surface;
an optical fiber strain transmissively coupled to the outer radial surface; and
tubing disposed at the outer radial surface being strain locked to the outer radial surface through at least one of interference fit with granules at least partially embedded into at least one of the tubing and the outer radial surface and adhesive bonding to both the tubing and the outer radial surface.

### Claim 2 (depends on 1)

The fiber optic strain locking arrangement of claim 1, wherein the cable assembly houses the optical fiber.

### Claim 3 (depends on 1)

The fiber optic strain locking arrangement of claim 1, wherein the outer radial surface is of a metal tubular encasing the optical fiber.

### Claim 4 (depends on 1)

The fiber optic strain locking arrangement of claim 1, wherein the tubing provides structural support to the cable assembly.

### Claim 5 (depends on 1)

The fiber optic strain locking arrangement of claim 1, wherein the tubing is metal.

### Claim 6 (depends on 1)

The fiber optic strain locking arrangement of claim 1, wherein the tubing is drawn down to radially interfere with the cable assembly.

### Claim 7 (depends on 1)

The fiber optic strain locking arrangement of claim 1, wherein the granules are a harder material than at least one of the outer radial surface and the tubing.

### Claim 8 (depends on 1)

The fiber optic strain locking arrangement of claim 1, wherein the outer radial surface is perimetrically discontinuous.

### Claim 9 (depends on 1)

The fiber optic strain locking arrangement of claim 1, wherein the granules are embedded in both the cable assembly and the tubing.

### Claim 10

A method of strain locking a fiber optic cable assembly to tubing comprising:
strain transmissively mounting an optical fiber to an outer radial surface of a cable assembly;
positioning granules or applying adhesive at the outer radial surface of the cable assembly or a face of a flat strip of tubing;
rolling the flat strip of tubing around the cable assembly;
seam welding the rolled flat strip of tubing;
embedding the granules into at least one of the outer radial surface and the face of the tubing or adhesively attaching the outer radial surface and the face; and
establishing strain transmissivity between the tubing and the cable assembly.

### Claim 11 (depends on 10)

The method of strain locking a fiber optic cable assembly to tubing of claim 10 further comprising drawing the seam welded tubing to a smaller radial dimension.

### Claim 12 (depends on 11)

The method of strain locking a fiber optic cable assembly to tubing of claim 11, further comprising maintaining the tubing at the smaller radial dimension.