Title:
DISPLACEMENT MEASURING INSTRUMENT
Document Type and Number:
Japanese Patent JPH0219713
Kind Code:
A
Abstract:
PURPOSE:To remarkably use the title instrument for various purposes by supplying an AC signal whose frequency is varied by a function of time to a primary coil which is brought to inductive coupling to a coil of a no-power source resonance circuit part. CONSTITUTION:First of all, when a displacement quantity is generated in a part to be measured, a resonance frequency of a no-power source resonance circuit part 2 is varied in accordance with its displacement quantity, and also, a resonance point of an AC signal Sa supplied to a primary coil 6 place din an inductive coupling state is varied. On the other hand, since the AC signal Sa whose frequency is varied by a function of time is supplied to the primary coil, 6 for instance, when a frequency in an hourly reference point of the AC signal Sa is specified, a frequency of the resonance point can be calculated, based on a function of a frequency variation and a detection time of the resonance point by a resonance point detecting part 8, and also, a displacement quantity corresponding to the frequency can be calculated. In this regard, in such a case, a correlation of the frequency at the resonance point to the displacement quantity is converted to data in advance in an arithmetic part 9.
Inventors:
TAKAHASHI KENICHI
SAKAGUCHI SHINICHI
SAKAGUCHI SHINICHI
Application Number:
JP16979788A
Publication Date:
January 23, 1990
Filing Date:
July 07, 1988
Export Citation:
Assignee:
NAGANO KEIKI SEISAKUSHO KK
International Classes:
G01B7/00; A61B5/00; A61B5/03; G01D5/20; G01D5/24; (IPC1-7): A61B5/00; A61B5/03; G01B7/00; G01D5/20; G01D5/24
Domestic Patent References:
| JPS57211024A | 1982-12-24 | |||
| JPS62109543A | 1987-05-20 | |||
| JPS5596141A | 1980-07-22 |
Attorney, Agent or Firm:
Shimoda Shigeru
Next Patent: JPH0219714