B1.1 - Influence of High-Temperature Strain Gauge Installation Parameters on Measurement Accuracy and Reliability in Engine Testing
- Event
- ETTC 2026 - European Test and Telemetry Conference
2026-06-09 - 2026-06-11
Nuremberg - Chapter
- Sensor I
- Author(s)
- O. Pohuliaiko, I. Vernyhora - "HIGH PRECISION MEASUREMENTS" LLC, Kyiv (Ukraine)
- Pages
- 177 - 180
- DOI
- 10.5162/ettc2026/B1.1
- Price
- free
Abstract
Strain measurement in gas turbine and rocket jet engines at 800 – 10⁰⁰°C remains challenging due to temperature-induced drift and instability. While hightemperature strain gauge alloys are well-studied, the influence of mounting process parameters is often underestimated in practice. This paper presents an experimental study of four key mounting parameters: cement layer thickness, surface roughness, heat treatment ramp rate, and flame-spray coating distance. Tests were performed on nichrome (diameter wire 18 µm) and FeCrAl (diameter wire 20, 45, 16.5 µm) gauges up to 950– 10⁰⁰°C. Results show that increasing ramp rates above 10°C/min cause microcracks. For Rokide flame-sprayed coatings, spraying distance below 80 mm causes thermal damage, while distance above 20 0 mm produces porous coating. Characteristic failure signatures for each violation are identified. Quantitative relationships provided enable error budgeting for high-temperature strain measurement in engine testing.