Displacement sensor with temperature compensation by combining outputs in a predetermined ratio

A displacement sensor for sensing displacement of a magnetic material to be measured, comprising:

• first magnetoelectric conversion means located in a place where a magnetic flux density is varied by displacement of said magnetic material to be measured,
• second magnetoelectric conversion means of the same type as that of said first magnetoelectric conversion means located in a place where a magnetic flux density is not varied by the displacement of said magnetic material to be measured,
• first circuit means provided in said first and second magnetoelectric conversion means and having a temperature coefficient of a polarity opposite to that of said magnet and said magnetoelectric conversion means so as to compensate for caused by temperature variations, and
• second circuit means connected to said first and second magnetoelectric conversion means for adding the outputs of said two magnetoelectric conversion means at a ratio of V20/V10 to provide a result of V2-[V1.times.(V20/V10)], wherein
• V1 and V2 are outputs from said first and second magnetoelectric conversion means, respectively, and
• V10 and V20 are outputs from said first and second magnetoelectric conversion means, respectively, for a displacement of 0 at a reference temperature.

A displacement sensor for sensing displacement of a magnetic material to be measured, comprising:

• first magnetoelectric conversion means located in a place where a magnetic flux density is varied by displacement of said magnetic material to be measured,
• second magnetoelectric conversion means of the same type as that of said first magnetoelectric conversion means located in a place where a magnetic flux density is not varied by the displacement of said magnetic material to be measured,
• circuit means connected to said first and second magnetoelectric conversion means for adding the outputs of said two magnetoelectric conversion means at a ratio of V20/V10 to provide a result of V2-[V1.times.(V20/V10)], wherein
• V1 and V2 are outputs from said first and second magnetoelectric conversion means, respectively, and
• V10 and V20 are outputs from said first and second magnetoelectric conversion means, respectively, for a displacement of 0 at a reference temperature, and
• means for adjusting a temperature coefficient of said first magnetoelectric conversion means so as to differ from a temperature coefficient of said second magnetoelectric conversion means thereby providing accurate displacement reading in a wide range of temperature variations.