# US 2019/0265016 A1 · Strain gauge

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- Number: US 2019/0265016 A1
- Document ID: US20190265016A1
- Status: Published application
- Kind: A1
- Application number: 16/344,929
- Filed: 2017-10-25
- Published: 2019-08-29
- Earliest claimed: 2016-10-28
- Assignees: Datum Electronics Limited
- Applicants: Datum Electronics Limited
- Inventors: Malcolm HABENS
- Web page: https://patentgrep.com/patent/US20190265016A1

## CPC

- G01B 7/18: {using change in resistance}
- G01L 1/04: by measuring elastic deformation of gauges, e.g. of springs
- G01L 1/2206: {Special supports with preselected places to mount the resistance strain gauges; Mounting of supports}
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)

## Abstract

A strain gauge for mounting on a surface. The strain gauge comprises first and second mounting pads arranged for securing to respective first and second portions of the surface. The first and second mounting pads having respective first and second upstanding walls each arranged to extend away from the surface to a bridging portion extending between the first and second upstanding walls. The strain gauge has a strain sensing element secured to one of the first and second upstanding walls.

## Claims

### Claim 1

A strain gauge for mounting on a surface, the strain gauge comprising first and second mounting pads arranged for securing to respective first and second portions of the surface, the first and second mounting pads having respective first and second upstanding walls each arranged to extend away from the surface to a bridging portion extending between the first and second upstanding walls, the strain gauge having a strain sensing element secured to one of the first and second upstanding walls.

### Claim 2 (depends on 1)

A strain gauge according to claim 1, wherein the bridging portion is thicker than at least the first or second upstanding wall to which the strain sensing element is secured.

### Claim 3

(canceled)

### Claim 4 (depends on 1)

A strain gauge according to claim 1, wherein the first or second upstanding wall to which the strain sensing element is secured is thicker than the other of the first or second upstanding wall.

### Claim 5

(canceled)

### Claim 6 (depends on 1)

A strain gauge according to claim 1, wherein the first and second mounting pads are thicker than at least the first or second upstanding wall to which the strain sensing element is secured.

### Claim 7

(canceled)

### Claim 8 (depends on 1)

A strain gauge according to claim 1, wherein the first and second mounting pads are arranged to be bonded to the surface.

### Claim 9 (depends on 1)

A strain gauge according to claim 1, wherein the first and second mounting pads, first and second upstanding walls and bridging portion are formed from a single piece of material.

### Claim at position 10

10-13. (canceled)

### Claim 14 (depends on 1)

A strain gauge according to claim 1, wherein said one of the first and second upstanding walls to which the strain sensing element is secured has generally opposed first and second sides, and wherein the strain sensing element is only provided on one of the first and second sides.

### Claim 15

(canceled)

### Claim 16 (depends on 1)

A strain gauge according to claim 1, wherein the strain sensing element comprises a plurality of sub elements and wherein a first sub element is located on a first portion of said one of the first and second upstanding walls to which the strain sensing element is secured,
wherein a second sub element is located on a second portion of said one of the first and second upstanding walls to which the strain sensing element is secured,
wherein said bridging portion extends between the first and second upstanding walls in a first direction, and
wherein the strain gauge is configured such that when said surface is deformed in a direction generally parallel to the first direction, one of said first portion of the upstanding wall and said second portion of the upstanding wall undergoes compressive deformation, and the other of said first portion of the upstanding wall and said second portion of the upstanding wall undergoes tensile deformation.

### Claim 17

(canceled)

### Claim 18 (depends on 16)

A strain gauge according to claim 16, wherein the strain sensing element comprises four sub elements connected in a bridge configuration.

### Claim 19 (depends on 18)

A strain gauge according to claim 18,
wherein a third sub element is located on a third portion of said one of the first and second upstanding walls to which the strain sensing element is secured,
wherein a fourth sub element is located on a fourth portion of said one of the first and second upstanding walls to which the strain sensing element is secured, and
wherein the strain gauge is configured such that when said surface is deformed in said direction generally parallel to the first direction, one of said third portion of the upstanding wall and said fourth portion of the upstanding wall undergoes compressive deformation, and the other of said third portion of the upstanding wall and said fourth portion of the upstanding wall undergoes tensile deformation.

### Claim 20 (depends on 1)

A strain gauge according to claim 1, wherein the strain sensing element is encapsulated.

### Claim 21

(canceled)

### Claim 22 (depends on 1)

A strain gauge according to claim 1, wherein the strain gauge is arranged to have a compliance which attenuates a first strain experienced between the first and second portions of the surface to a second strain experienced by said one of the first and second upstanding walls to which the sensing element is secured, wherein the first strain is substantially larger than the second strain.

### Claim 23

(canceled)

### Claim 24

A strain gauge for mounting on a surface, the strain gauge comprising
a first end for securing to a first potion of the surface,
a second end for securing to a second portion of the surface,
a bridging portion extending between the first and second ends, the bridging portion including a measurement surface, and
a strain sensing element secured to the bridging portion,
wherein the strain gauge extends in a first direction from said first end to said second end,
wherein the strain gauge is configured such that, when said surface is deformed in a direction generally parallel to the first direction, a first portion of the measurement surface undergoes compressive deformation, and a second portion of the measurement surface undergoes tensile deformation, and
wherein the strain sensing element includes
a first sub element arranged to sense deformation of the first portion of the measurement surface, and
a second sub element arranged to sense deformation of the second portion of the measurement surface.

### Claim at position 22

25-26. (canceled)

### Claim 27 (depends on 24)

A strain gauge according to claim 24, wherein the first end comprises a first mounting pad and the second end comprises a second mounting pad and wherein the first and second mounting pads are arranged to be bonded to the surface.

### Claim 28

(canceled)

### Claim 29 (depends on 24)

A strain gauge according to claim 24, wherein the strain sensing element comprises third and fourth sub elements and the first, second, third and fourth sub elements are connected in a bridge configuration.

### Claim 30 (depends on 29)

A strain gauge according to claim 29, wherein the strain gauge is configured such that, when said surface is deformed in a direction generally parallel to the first direction, a third portion of the measurement surface undergoes compressive deformation, and a fourth portion of the measurement surface undergoes tensile deformation, and
wherein the third sub element is arranged to sense deformation of the third portion of the measurement surface, and
wherein the fourth sub element arranged to sense deformation of the fourth portion of the measurement surface.

### Claim 31 (depends on 24)

A strain gauge according to claim 24, wherein the strain sensing element is encapsulated.

### Claim 32

(canceled)

### Claim 33 (depends on 24)

A strain gauge according to of claim 24, wherein the strain gauge is arranged to have a compliance which attenuates a first strain experienced between the first and second portions of the surface to a second strain experienced by said measurement surface, wherein the first strain is substantially larger than the second strain.

### Claim 34

(canceled)

### Claim 35 (depends on 2)

A strain gauge according to claim 2, wherein there is a gap between the first and second ends and the bridging portion spans over the gap.

### Claim 36 (depends on 1)

The strain gauge according to claim 1 mounted on a structural element for measuring strain in the structural element.

### Claim 37

(canceled)