NASA’s newest orbital X-ray telescope technology uses highperformance capacitive displacement sensors from Lion Precision. The sensors, capable of resolving position to less than 10 nanometers, are used during the mounting of over 10,000 thin glass mirrors into the telescope’s “lens.” Each mirror is about the size of a sheet of paper and only four times thicker. Achieving the required optical specifications for the telescope requires that each of the mirrors be mounted into position with better than 1 μm of accuracy. The mirrors must be able to hold this positional and angular accuracy during launch and deployment in space.

Epoxy syringe and capacitive displacement sensor arrangement. The mirror is transparent at the camera angle.

A specially designed machine holds the mirrors precisely in place while they are bonded to mounting tabs with ultraviolet cured epoxy. The system uses Lion Precision Elite Series capacitive sensors to monitor changes in the mirror position during the epoxy injection. The machine adjusts the epoxy pressure to precisely move the mirrors into the proper position.

Previously, laser displacement sensors were used but were eventually abandoned because of insufficient resolution and size-related mounting difficulty. Also, the generation of too much heat caused thermal expansion of the components during the delicate operation. The capacitive sensors are less expensive, small enough to easily mount, and generate virtually no heat during operation.

Elite Series capacitive displacement sensors
Lion Precision
St. Paul, MN

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