Electromagnetic impedance sensor and passenger protection system
First Claim
1. An electromagnetic impedance sensor for detecting an object with contact-free, wherein the object is made of conducting material or soft magnetic material, the sensor comprising:
- a detection coil having a coil surface, which faces a detection area in which the object is disposed; and
a detection circuit for supplying alternating electricity to the detection coil and for detecting the object by measuring change of an electromagnetic impedance in the detection coil, whereinthe detection coil includes a plurality of coil portions, which are provided by one wire,each coil portion is disposed on the coil surface to have a predetermined arrangement, andthe plurality of coil portions is sequentially arranged along with a first direction.
1 Assignment
0 Petitions
Accused Products
Abstract
An electromagnetic impedance sensor detects an object made of conducting material or soft magnetic material with contact-free. The sensor includes: a detection coil; and a detection circuit for supplying electricity to the coil and for measuring electromagnetic impedance change in the coil. The detection coil includes multiple coil portions provided by one wire. One coil portion has a side adjacent to a corresponding side of another coil portion. The side and the corresponding side extend along with a direction, and the side has a current flowing direction, which is the same as the corresponding side.
15 Citations
12 Claims
-
1. An electromagnetic impedance sensor for detecting an object with contact-free, wherein the object is made of conducting material or soft magnetic material, the sensor comprising:
-
a detection coil having a coil surface, which faces a detection area in which the object is disposed; and a detection circuit for supplying alternating electricity to the detection coil and for detecting the object by measuring change of an electromagnetic impedance in the detection coil, wherein the detection coil includes a plurality of coil portions, which are provided by one wire, each coil portion is disposed on the coil surface to have a predetermined arrangement, and the plurality of coil portions is sequentially arranged along with a first direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification