# US 12,216,014 B2 · Deformation measuring device and deformation measuring method

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- Number: US 12,216,014 B2
- Document ID: US12216014B2
- Status: Granted
- Kind: B2
- Application number: 17/912,099
- Filed: 2020-03-18
- Published: 2023-02-09
- Granted: 2025-02-04
- Earliest claimed: 2020-03-18
- Assignees: Nippon Telegraph and Telephone Corporation
- Applicants: Nippon Telegraph and Telephone Corporation
- Inventors: Daiki Kobayashi; Kazuaki Watanabe; Masafumi Nakagawa; Atsushi Aratake
- Web page: https://patentgrep.com/patent/US12216014B2

## CPC

- G01L 1/2287: {constructional details of the strain gauges (adjustable resistors H01C10/00)}
- G01B 7/16: for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01L 5/10: using electrical means
- G01L 5/102: using sensors located at a non-interrupted part of the flexible member
- G01M 5/0058: {of elongated objects, e.g. pipes, masts, towers or railways}
- F16L 11/118: having arrangements for particular purposes, e.g. electrically conducting
- G01M 5/0025: {of elongated objects, e.g. pipes, masts, towers or railways (G01M5/0058 takes precedence)}
- H02G 3/0468: {Corrugated}
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES

## Abstract

A strain measuring device (100) is a strain measuring device (100) for measuring strain on an FEP (10), and includes a viscous body (101) that has a lower rigidity than the FEP (10) and covers an uneven surface of the FEP (10), and a strain gauge (102) that is attached to a portion of a surface of the viscous body (101).

## Claims

### Claim 1

A strain measuring device for measuring strain on a flexible electric pipe, the device comprising:
a viscous body that has a lower rigidity than the flexible electric pipe and covers an uneven surface of the flexible electric pipe; and
a strain gauge that is attached to a portion of a surface of the viscous body.

### Claim 2 (depends on 1)

The strain measuring device according to claim 1, further comprising:
an adhesive portion configured to bond the viscous body and the strain gauge to each other.

### Claim 3 (depends on 2)

The strain measuring device according to claim 2, further comprising:
a waterproof tape that is attached onto the strain gauge.

### Claim 4 (depends on 2)

The strain measuring device according to claim 2, further comprising:
a protective portion that is provided at a boundary portion between the strain gauge and a lead wire.

### Claim 5 (depends on 1)

The strain measuring device according to claim 1, further comprising:
a waterproof tape that is attached onto the strain gauge.

### Claim 6 (depends on 5)

The strain measuring device according to claim 5, further comprising:
a protective portion that is provided at a boundary portion between the strain gauge and a lead wire.

### Claim 7 (depends on 1)

The strain measuring device according to claim 1, further comprising:
a protective portion that is provided at a boundary portion between the strain gauge and a lead wire.

### Claim 8

A strain measurement method for measuring strain on a flexible electric pipe, the device comprising:
covering an uneven surface of the flexible electric pipe with a viscous body that has a lower rigidity than the flexible electric pipe; and
attaching a strain gauge to a portion of a surface of the viscous body.

### Claim 9 (depends on 8)

The strain measurement method according to claim 8, further comprising:
attaching a waterproof tape onto the strain gauge.

### Claim 10 (depends on 9)

The strain measurement method according to claim 9, further comprising:
inserting a rod into the flexible electric pipe before the covering the uneven surface.

### Claim 11 (depends on 8)

The strain measurement method according to claim 8, further comprising:
inserting a rod into the flexible electric pipe before the covering the uneven surface.

### Claim 12 (depends on 8)

The strain measurement method according to claim 8, further comprising:
bonding the viscous body and the strain gauge to each other using an adhesive portion.

### Claim 13 (depends on 12)

The strain measurement method according to claim 12, further comprising:
inserting a boundary portion between the strain gauge and a lead wire using a protective portion.

### Claim 14 (depends on 12)

The strain measurement method according to claim 12, further comprising:
attaching a waterproof tape onto the strain gauge.

### Claim 15 (depends on 8)

The strain measurement method according to claim 8, further comprising:
inserting a boundary portion between the strain gauge and a lead wire using a protective portion.