Displacement measuring apparatus

Details Displacement measuring apparatus Displacement measuring apparatus

1988-07-25

1990-04-03

Chin, Gary

Boots, shoes, and leggings

36457101, 33504, 33505, 73 1J, 377 17, G06F 1536, G01F 2500, G05B 1928

Patent

active

049146106

ABSTRACT:
When a probe of a displacement measuring apparatus is moved, a core member connected to the probe is also moved through coils of an oscillator. A movement distance of the probe is calculated in accordance with a change in an oscillation frequency generated in correpondence with the movement of the core member. If strict displacement measuring is to be performed, the non-linear relationship between the moving distance of the core member and the change in the oscillation frequency must be taken into account, i.e., the relationship therebetween is measured in linear manner, the movement distance is calculated and then secondary curvature correction is performed to correct for the linear measurement. Therefore, measurement precision of the displacement measuring apparatus can be greatly improved as compared to that of a conventional displacement measuring apparatus.

REFERENCES:
patent: 3891918 (1975-06-01), Ellis
patent: 4550518 (1985-10-01), Deis
patent: 4587622 (1986-05-01), Herzog
patent: 4602196 (1986-07-01), Matsui
patent: 4608657 (1986-08-01), Manome et al.
patent: 4736313 (1988-04-01), Nishimura et al.

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