G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 33/04 (2006.01) G01N 27/82 (2006.01) G01N 27/90 (2006.01)
Patent
CA 2064083
A magnetism detecting apparatus of this invention includes a magnetic sensor (11) constituted by a ferro-magnetic core (12) and a detection coil (13) wound around the core (12), a parallel resonance circuit (15) constituted by the detection coil (13) of the magnetic sensor (11) and a capacitance element (14) connected in parallel with the detection coil (13), an oscillation circuit (18), which is constituted by an amplifier (16) to which the parallel resonance circuit (15) and a resistor (17) are connected as a feedback circuit, and the parallel resonance circuit (15), and excites the core (12) to a saturation region by using an oscillation current, and a waveform change detecting circuit (22, 24) for detecting a change in waveform of an output signal from the oscillation circuit (18). That is, the core (12) is excited to the saturation region by the oscillation circuit (18) using the detection coil (13) of the magnetic sensor (11) as part of the parallel resonance circuit (15), and an external magnetic field (H) applied to the magnetic sensor (11) is detected on the basis of the amount of change in waveform of an output signal (a) from the oscillation circuit (18). As a result, the circuit arrangement can be simplified, and a reduction in size and manufacturing cost of the overall apparatus can be realized while maintaining high measurement precision.
Ando Seigo
Murakami Yoshihiro
Ando Seigo
Murakami Yoshihiro
Nkk Corporation
Ridout & Maybee Llp
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