NPM140SG shown with AJS100-2. Order actuators separately.
The NPM140 Piezoelectric micrometer adapter provides nanometer positioning capability for manual products. This adapter mounts to the actuator seat on the stage and is mechanically compatible with all Newport stages, mounts and actuators with Φ 0.375 (Ø 9.5mm) mounting flange*.Pre-adjustment is done with the manual screw in the same way as without the adapter. Final, fine adjustment relative to the manually set position is accomplished by controlling the piezo voltage of the NPM140. An extraordinary long piezo travel range of 140 µm is provided by a sophisticated wire EDM flexure system. The flexure serves also as a linear guide for the actuator tip. Resolution of the piezoelectric motion is in the sub-nanometer range.The NPM140 is available as open-loop (means no position feedback) or closed-loop device with integrated position feedback (NPM140SG). In open-loop, the resolution is only limited by the noise of the control electronics, but repeatability and stability are compromised due to the hysteresis and creep of the piezo ceramic material. The NPM140SG features a high resolution strain-gauge position sensor for highly accurate and repeatable motion. Also, the position feedback compensates for actuator creep. For highest position stability and highest temperature-insensitive performance, the sensor is assembled in a full Wheatstone bridge design. The NPM140SG can be operated in open or closed-loop control.*Note: The adapter holds the manual screw 22 mm back from its normal position. Hence, in order to use the total travel range provided by the mechanic, actuators with 22 mm longer travel than recommended should be used with all devices.