Displacement sensors to check rocket engine valves

The eddy-current displacement sensors will monitor valves responsible for the flow of liquid oxygen and liquid hydrogen in rocket engine test cells.

Sensor measurements and sensor health information will be transmitted using the MTConnect communication protocol.

Development of the system will require the expansion of MTConnect to include XML tags for sensor measurement and health parameters.

To help prevent failures in the rocket engine tests, the sensors will monitor the condition of critical valves.

The sensors will provide a precise measurement of the final seated position of the valve when closed.

That position verifies that the valve is closed and also indicates valve wear.

This data will inform operators when a valve requires maintenance rather than waiting until it fails or performing costly, unnecessary maintenance at a predefined time interval.

The sensors will also monitor their own functionality and report any apparent malfunctions of the sensing system.

Such a system will save thousands of dollars in unnecessary repairs and failed tests.

Stennis Space Center is NASA's primary centre for testing rocket propulsion systems for the space shuttle and future generations of space vehicles.

Several rocket engine test cells at the facility allow testing the rocket engines and rocket engine components while holding them stationary, allowing instruments to monitor all the parameters of engine performance.