Patent ID: 8340911

Claim:
A system for measuring a parameter of earth formation in the vicinity of a borehole, the system comprising: (a) a borehole assembly comprising (i) a quad compensated ensemble crystal oscillator system comprising an ensemble of quad compensated clocks, each said quad compensated clock comprising four oscillator crystals, wherein for each said quad compensated clock, said oscillator crystals in each said quad compensated clock are configured relative to a sensitivity vector of each said oscillator crystal to form a quad compensated resonator, and outputs of said oscillator crystals in said quad compensated resonator are combined to form a quad compensated clock output for each quad compensated clock, and (ii) a geophysical sensor; (b) a conveyance structure for conveying said borehole assembly along said borehole; (c) means for combining said quad compensated clock outputs to form a quad compensated ensemble crystal oscillator clock output, and (d) means for combining output from said geophysical sensor with said quad compensated ensemble crystal oscillator clock output to determine said parameter of earth formation.