| 摘要 |
PURPOSE:To facilitate the indication of plane pole coordinates by measuring rectangular coordinate components of a two-dimensional vector quantity so as to be converted into a sine wave and a cosine wave with an amplitude proportional to the magnitude thereof and detecting the phase of a sine wave signal from the addition of the two waves. CONSTITUTION:An x component of a displacement vector quantity generated at a point 9 involved is detected with a detector 1A, the amplitude of a sine wave reference signal Vp is supplied from the power source 4 modulated into a value proportional to the magnitude of the x component and the output sine wave signal Vx is inputted into an arithmetic section 2. Likewise, an output signal corresponding to a y displacement component from a detector 1B is given to the arithmetic section 2 as a cosine wave signal Vy shifted by 90 deg. in the phase via an amplifier 12B and a phase shifter 13. The signals Vx and Vy are added at an arithmetic section 2 to be converted into a sine wave signal Vo including a phase angle theta, which is detected with a phase detector section 3A. This facilitates the indication of a plane pole coordinate in which the amplitude of Vo corresponds to the magnitude of a radius vector and the angular displacement thereof to the phase angle theta. |
