Combination of motorized and piezoelectric translation for long-

Details Combination of motorized and piezoelectric translation for long- Combination of motorized and piezoelectric translation for long-

1994-04-29

1995-08-29

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356359, G01B 1102

Patent

active

054465478

ABSTRACT:
A scanning interferometer that utilizes a DC gear motor instead of a PZT translator in closed-loop configuration with an LVTD position sensor. The DC motor is connected to the scanning mechanism so that a rotational motion of the motor shaft produces a translation along the optical axis of either the sample or the objective of the interferometer. During scanning, the motor is driven by the input of a ramp signal into the system. The closed-loop configuration is such that a constant, or nearly constant voltage is applied to the DC motor to produce a constant-speed scan in response to the ramp input. Any non-linearity in the speed of motion is corrected by an adjustment to the motor voltage. At the completion of the scan, the ramp input is removed and the motor is automatically returned to the starting position to satisfy the closed-loop condition. In order to maintain the image in focus on the sensor over the wide range of scanning, a pair of relay lenses is inserted in the optical path between the interferometer and the light detector.

REFERENCES:
patent: 4083056 (1978-04-01), Nakamura et al.
patent: 4512642 (1985-04-01), Ito et al.
patent: 4686359 (1987-08-01), Yokoi et al.
patent: 4869593 (1989-09-01), Biegeu
patent: 5204734 (1993-04-01), Cohen
patent: 5233201 (1993-08-01), Cheng

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