# Home > Actuators > Precision measuring

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**Topic under **Precision measuring

**Source:** ntrs.nasa.gov

**File size:** **3.17 MB**

**File type:** **pdf**

**Last download on:**
Tue Nov 28, 2017 07:00:34 AM

__Short Desciption__:

... actuator, cryogenic actuator 1. INTRODUCTION Electromechanical actuators with large stroke and high precision are ... Cryogenic displacement measurement results. (a) actuator ...

__Summary__:

In this paper, PMN-PT single crystal piezoelectric stack actuators and flextensional actuators were designed, prototyped
and characterized for space optics applications. Single crystal stack actuators with footprint of 10 mm x10 mm and the
height of 50 mm were assembled using 10 mm x10mm x0.15mm PMN-PT plates. These actuators showed stroke > 65 –
85 ?m at 150 V at room temperature, and > 30 ?m stroke at 77 K. Flextensional actuators with dimension of 10mm x 5
mm x 7.6 mm showed stroke of >50 ?m at room temperature at driving voltage of 150 V. A flextensional stack actuator
with dimension of 10 mm x 5 mm x 47 mm showed stroke of ~ 285 ?m at 150 V at room temperature and > 100 ?m at
77K under driving of 150 V should be expected. The large cryogenic stroke and high precision of these actuators are
promising for cryogenic optics applications.

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"Cryogenic Piezoelectric Actuator"

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