Approaching apparatus using spectral shift for sample-probe...

Details Approaching apparatus using spectral shift for sample-probe... Approaching apparatus using spectral shift for sample-probe...

2005-12-06

2005-12-06

Pham, Hoa Q. (Department: 2877)

Optics: measuring and testing

Position or displacement

Reexamination Certificate

active

06972851

ABSTRACT:
An approaching apparatus based on spectral shift is disclosed, which includes a broadband light source, an optical-guide unit, and an optical receiving unit. The broadband light source emits a broadband light with the first central wavelength to the optical-guide unit and illuminates a sample via a probe within the optical-guide unit. A generated broadband light of the second central wavelength goes back the optical-guide unit via the original optical path to reach the optical receiving unit. Then, the receiving unit calculates the distance between the probe and the sample based on the characteristic curve of the approaching distance vs. the deviation of the first central wavelength. The deviation is used for feedback control so that the displacement driver moves the probe to adjust the distance between the probe and the sample.

REFERENCES:
patent: 4844617 (1989-07-01), Kelderman et al.
patent: 6034774 (2000-03-01), Marcus et al.
patent: 6750960 (2004-06-01), Bowers
patent: 6781677 (2004-08-01), Muenter et al.

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