Measuring and testing – Surface and cutting edge testing – Roughness
Patent
1994-05-19
1996-05-14
Williams, Hezron E.
Measuring and testing
Surface and cutting edge testing
Roughness
G01B 528
Patent
active
055157190
ABSTRACT:
An atomic force microscope in which the deflection of the force sensing probe owing to surface forces is canceled by an opposing magnetic force applied to a small magnetic particle on a force sensing cantilever. A deflection of the force sensing cantilever is detected by reflecting a laser beam from the cantilever into a position sensitive detector. The voltage signal from the position sensitive detector is used to drive an integrating servo loop which drives a current in a solenoid placed close to the force sensing cantilever, and exerts a force opposing the atomic force of attraction between the force sensing cantilever and the sample surface via a small magnetic particle attached to the cantilever and having its magnetic moment aligned with the axis of the solenoid. In this way, deflection of the force sensing cantilever is prevented for any force within the range of the servo control system. The driving signal for the cantilever is a measure of the operating force of the microscope and can be used to drive a conventional atomic force microscope controller to generate topographical images of the surface. The system works submerged in water and other liquids and can be used for profiling soft surfaces while avoiding the problem of the force sensing cantilever being pulled into the sample surface by attractive interactions between the sample surface and the force sensing cantilever.
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Larkin Daniel S.
Molecular Imaging Corporation
Williams Hezron E.
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