Accession Number:

ADA021746

Title:

Hydraulic Actuators for Active Optical Systems.

Descriptive Note:

Final technical rept. 1 Oct 74-22 Jun 75,

Corporate Author:

HUGHES RESEARCH LABS MALIBU CALIF

Personal Author(s):

• Hansen,S.

Report Date:

1975-08-01

Pagination or Media Count:

46.0

Abstract:

A fast response, high accuracy, compact hydraulic actuator has been developed and demonstrated for applications that require actuators providing moderate speed, high force, and large optical path length excursions, e.g., as a mirror driver in an adaptive optical system. The actuator is characterized by a -3 dB response bandwidth of 670 Hz when operated at a supply pressure of 3000 psi, and a total excursion of 42.4 micrometers, which corresponds to plus or minus 4 wavelengths of phase shift at 10.6 micrometers when used as a mirror driver. The actuator was tested in a deformable faceplate fixture that simulates nine actuator positions at a modular spacing of 2 cm 0.8 in.. Plots are given of measured mirror surface profiles and contours. A computed contour plot is given for comparison. Also included is a program for computer simulation of the actuator in a complete multichannel, multidither COAT control system.

Descriptors:

• *OPTICAL RADAR
• *LASERS
• *PHASE SHIFT
• *HYDRAULIC ACTUATORS
• COMPUTER PROGRAMS
• COMPUTERIZED SIMULATION
• CONTROL SYSTEMS
• MOLYBDENUM
• COOLING
• FORTRAN
• PHASED ARRAYS
• FLUID FLOW

Subject Categories:

• Lasers and Masers
• Optical Detection and Detectors
• Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE