Pressure probe instrument, incorporating "infinite line" principle, can be used to remotely measure dynamic pressure fluctuations in hot high-pressure environemnts too severe for sensors. System is designed and can be utilized for measurements in core of operating turbofan engine.

This contribution presents an innovative technique to determine the transfer function of pneumatic and fast-response pressure probes. The dynamic response is determined experimentally with pressure step-tests. In the case of conventional instrumentation fast-opening valves or balloon explosions are used. For the fast-response pressure sensors, shock tube tests are performed. The response of the probe is fitted in the time domain with the response of an m-order linear system. This numerical system is then used to correct the lag and dynamic error of the measurement chain.

Instrument measures dynamic pressure fluctuations

Citations

Digital compensation of pressure sensors in the time domain

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