HIGH TEMPERATURE STRAIN GAGE

• US 3,745,502 A
• Filed: 09/18/1972
• Issued: 07/10/1973
• Est. Priority Date: 09/28/1971
• Status: Expired due to Term

• Current Assignee: Kenji Kanai, Osamu Watanabe, Takeshi Shioda
• Original Assignee: Kenji Kanai, Osamu Watanabe, Takeshi Shioda
• Inventors: Watanabe, Osamu, Shioda, Takeshi, Kanai, Kenji
• Primary Examiner(s): Albritton, C. L.
• Application Number:
  US05/290,148
• Time in Patent Office: 295 Days
• Field of Search: 338/2-6 73/88.5R,88.5D
• US Class Current: 338/3
• CPC Class Codes: G01L 1/2287 constructional details of the strain gauges adjustable resistors H01C10/00

Abstract

A high temperature strain gage comprising an active gage and a dummy gage mounted on a meshed metal base by means of heatresisting adhesive such as ceramics. The gage is suitable to be mounted on a test piece either by spot welding or by an adhesive. The dummy gage is isolated from outer stress by providing openings in the meshed metal base around the dummy gage so that the dummy gage can always produce accurate temperature dependent error compensating output.

Claims

2. A high temperature strain gage as claimed in claim 1, wHerein the heat-resisting adhesive is ceramics.

3. A high temperature strain gage as claimed in claim 1, wherein the meshed metal base is made from a metal plate such as nickel chromium alloy.

4. A high temperature strain gage comprising an active gage (12) and a dummy gage (14) of metal wire type both mounted on a thin meshed metal base (10) by means of heat-resisting adhesive and are connected to lead wires (20, 22, 24), the meshed metal base (10) is provided with openings (26, 28, 30, 32) at locations surrounding the dummy gage (14) and the meshed metal base (10) is further provided with a portion (18) through which the strain gage can be mounted on a measuring body by welding and a peripheral meshed portion of the portion (18) through which the strain gage can be mounted on a measuring body by heat-resisting adhesive.

5. A high temperature strain gage as claimed in claim 4, wherein the heat-resisting adhesive is ceramics.

6. A high temperature strain gage as claimed in claim 4, wherein the meshed metal base is made from plate of nickel chromium alloy.

7. A high temperature strain gage as claimed in claim 4, wherein the meshes at the portion for welding are made blind to be fixed by spot welding.

8. A high temperature strain gage as claimed in claim 4, wherein the portion mounting the dummy gage (14) is surrounded by openings (26, 28, 30, 32) encircling the portion at four lateral directions.

9. A high temperature strain gage as claimed in claim 4, wherein the meshed metal base (10) is made by photo-etching.