High frequency measurement for current-in-plane-tunneling

Details High frequency measurement for current-in-plane-tunneling High frequency measurement for current-in-plane-tunneling

2006-04-25

2006-04-25

Nguyen, Vinh (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

Reexamination Certificate

active

07034519

ABSTRACT:
An improved method and apparatus for determining a property based upon at least two measurements uses simultaneous probe signals having two different frequencies. The probe signals are produced simultaneously such that the position of the probes is identical when the probe signals are produced. The responses to the two probe signals have frequencies that correspond to the probe signals. The individual responses are isolated from each other based upon their differing frequencies by frequency lock-in circuits. By performing the measurements simultaneously, positional errors that are introduced due to small changes that occur in the position of the probes if the measurements are taken sequentially are eliminated.

REFERENCES:
patent: 3609537 (1971-09-01), Healy et al.
patent: 4335350 (1982-06-01), Chen
patent: 4891577 (1990-01-01), Ishikawa
patent: 4994154 (1991-02-01), Chen et al.

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