MAGNETIC POWDER CONCENTRATION SENSOR AND METHOD FOR DETECTING CONCENTRATION OF MAGNETIC POWDER IN SAMPLE

To provide a magnetic powder concentration sensor with a small size and a method for detecting the concentration of magnetic powders which are not easily affected by temperature changes and can easily measure the concentration of magnetic powders.SOLUTION: A magnetic power concentration sensor 1a according to an embodiment includes a first coil 11 and a second coil 12 generated by a voltage e2 based on a magnetic flux A1 generated by the first coil 11. The first coil 11 and the second coil 12 have a core material 3 as a magnetic core and are respectively wound around a first part 31 and a second part 32 of the core material 3. The core material 3 has a first annular part 3a including the first part 31 and the second part 32 and a second annular part 3b sharing one of the first part 31 and the second part 32 with the first annular part 3a. One of the first annular part 3a and the second annular part 3b includes a part 4 exposed to a test target sample S.SELECTED DRAWING: Figure 3 【課題】小型で温度変動の影響を受け難く、且つ簡便に試料中の磁性粉濃度を測定することができる磁性粉濃度センサ、及び磁性粉濃度の検出方法を提供する。【解決手段】実施形態の磁性粉濃度センサ１ａは、第１コイル１１と、第１コイル１１によって生成される磁束Ａ１に基づく電圧ｅ２を生じさせる第２コイル１２と、を備えている。第１コイル１１及び第２コイル１２は磁心となるコア材３を共有していてコア材３の第１部分３１及び第２部分３２にそれぞれ巻かれている。コア材３は、第１部分３１及び第２部分３２を含む第１環状部３ａと、第１部分３１又は第２部分３２を第１環状部３ａと共有している第２環状部３ｂと、を有し、第１環状部３ａ及び第２環状部３ｂのいずれか一方は、被検試料Ｓに晒される部分４を含んでいる。【選択図】図３