Multichannel averaging phasemeter for picometer precision laser metrology

Details Multichannel averaging phasemeter for picometer precision laser metrology Multichannel averaging phasemeter for picometer precision laser metrology

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3740..646h&link_type=abstract

Proc. SPIE Vol. 3740, p. 646-649, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), Ichirou Yamaguchi; Ed.

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The Micro-Arcsecond Metrology (MAM) team at the Jet Propulsion Laboratory has developed a precision phasemeter for the Space Interferometry Mission (SIM). The current version of the phasemeter is well-suited for picometer accuracy distance measurements and tracks at speeds up to 50 cm/sec, when coupled to SIM's 1.3 micron wavelength heterodyne laser metrology gauges. Since the phasemeter is implemented with industry standard FPGA chips, other accuracy/speed trade-off points can be programmed for applications such as metrology for earth-based long-baseline astronomical interferometry (planet finding), and industrial applications such as translation stage and machine tool positioning. The phasemeter is a standard VME module, supports 6 metrology gauges, a 128 MHz clock, has programmable hardware averaging, and maximum range of 232 cycles (2000 meters at 1.3 microns).

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