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Point Ahead Mechanism PAM30 for Deep Space Optical Communication (DSOC)

Point Ahead Mechanism PAM30 for Deep Space Optical Communication (DSOC)
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Point Ahead Mechanism PAM30 for Deep Space Optical Communication (DSOC) - 1

CEDRAT TECHNOLOGIES Innovation in Mechatronics Point Ahead Mechanism PAM30 for Deep Space Optical Communication (DSOC) Cedrat Technologies (CTEC) designed, manufactured, tested and delivered to L3-Harris the first Engineering Model of the PAM30 to be integrated in the JPL DOSC Module of the NASA Psyche Mission. The PAM30 aims at accurately pointing the optical downlink signal (communication laser beam) towards Earth position from the Psyche Asteroid beyond Mars Planet. The PAM30 consists in a SiC mirror mounted on a 2-rotation axis (“Tip Tilt”), small range and pointing mechanism with Strain Gages positioning sensors, mounted on a bracket including a thermal sensor (Fig 2). Fig. 2: PAM overview including amplified piezo actuators APA® and SiC mirror Copyright © CEDRAT TECHNOLOGIES | 01/2020 The PAM30 is based on a two stiff push pull pairs of APA120SM piezo actuators. It produces more than +/-3 mrad for both axis rotations for the full -40/+65°C operational temperature spectrum with loaded mechanical resonant frequencies above 1 000 Hz. Fig. 3: Mirror surface deformation simulation and analysis CEDRAT TECHNOLOGIES • 59 Chemin du Vieux Chêne • Inovallée • 38246 MEYLAN Cedex France • Tel. : +33 (0

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Point Ahead Mechanism PAM30 for Deep Space Optical Communication (DSOC) - 2

CEDRAT TECHNOLOGIES Innovation in Mechatronics Point Ahead Mechanism PAM30 for Deep Space Optical Communication (DSOC) The SiC mirror has been manufactured and polished by Mersen OptoSiC. In order to be compliant with the 63 nm flatness requirement, the mirror shape and interfaces have been co designed by Mersen OptoSiC & CTEC. CTEC developed specific simulation tools to compute any impact on the mirror flatness coming from environmental, operating and boundary conditions (Fig 3) as well as dedicated tools and step by step process to integrate the SiC mirror and check its flatness after...

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