摘要:
An accelerometer comprises essentially a leaf spring (12) having at its free extremety, as essential mass, an eddy current disk (13) and an eddy current brake with magnets (16, 17) of opposite polarity and a low retentivity iron conductance which dampers the vibration of the spring-mass system formed by the leaf spring (12) and the eddy current disk (13). The stroke of the inert mass is converted into an output voltage proportional to the acceleration by a sensor magnet (19) and a Hall element (20) as a means for travel detection. This accelerometer is built into a motor vehicle, for example, and used to release safety devices, such as safety belt tighteners, for example. It has the advantage of having a frequency response that is almost not temperature dependent, of being simple and compact.
摘要:
In one of aspects, a mobile electronic device that is configured to determine transportation thereof comprises at least one controller that is configured to, while a predetermined vibration is being detected, determine that the transportation is a train when a predetermined change in magnetic field strength is detected within a predetermined period of time. On the other hand, the at least one controller is configured to determine that the transportation is an automobile when the predetermined change in the magnetic field strength is not detected within the predetermined period of time. The at least one controller is further configured to determine that, when predetermined information regarding rotation of the mobile electronic device is detected, the transportation is an automobile even when the predetermined change in the magnetic field strength has been detected within the predetermined period of time.
摘要:
Magnetic pressure sensor device, of the type comprising at least one magnetic layer (11) able to vary a magnetisation associated thereto in response to a pressure (P) exerted thereon. Said device (20; 30; 40; 50) comprises a plurality of layers (11, 12, 13, 14, 15, 16, 17) arranged in a stack, said magnetic layer (11) able to vary a magnetisation associated thereto in response to a pressure (P) comprising a free magnetic layer (11), able to be associated to a temporary magnetisation (MT), said free magnetic layer (11) belonging to said plurality of layers (11, 12, 13, 14, 15, 16, 17), which further comprises at least a spacer layer (13; 23; 33) and a permanent magnetic layer (12) associated to a permanent magnetisation (MP). Said sensor device (20) further comprises a compressible layer (21; 31; 42) and a layer with high magnetic coercivity (22; 32; 42) associated to said plurality of layers (11, 12, 13, 14, 15, 16, 17).
摘要:
An acceleration sensor includes a housing member (20, 20), a spring member (21, 61, 71) attached to the housing member, the spring member having freedom in at least one direction of acceleration to be detected, a weight and magnetic field generation member (22, 62) fixed to the spring member, and at least one magnetic field detection sensor (23, 24, 63) attached to the housing member to face the weight and magnetic field generation member. The at least one magnetic field detection sensor (23a, 24a, 63a) is provided with at least one multi-layered MR element including a magnetization fixed layer and a magnetization free layer. A direction of magnetic field applied to the at least one multi-layered MR element from the weight and magnetic field generation member is perpendicular to a lamination plane of the at least one multi-layered MR element when no acceleration is applied.
摘要:
A motion sensor which can easily and accurately detect bearing, attitude and acceleration in any of three-dimensional directions and a portable telephone using the same. The motion sensor comprises three magnetic sensing parts for detecting.magnetic field strength in 3-axis directions orthogonal to one another, and three acceleration sensing parts for detecting accelerations in the 3-axis directions. Each of the acceleration sensing parts has a magnet body constituted to be able to displace depending on acceleration, and a magnet displacement detection head for detecting a displacement of the magnet body. The three magnetic sensing parts and the three magnet displacement detection heads are all made of the same type of magnetic detection elements which operate based on common operation principles. The three magnetic sensing parts and the three acceleration sensing parts are integrated into one modular package together with one electronic circuit for controlling these six magnetic detection elements.
摘要:
A ferrofluid sensor assembly includes a permanent magnet which is supported in a hermetically-sealed housing by ferrofluid rings at each end of the magnet. However, the housing is large enough that the ferrofluid rings do not seal the end of the magnet against the walls of the housing. The housing is filled with a non-magnetic liquid that is immiscible with the ferrofluid. The nonmagnetic liquid wets the walls of the housing such that the ferrofluid rides on the thin film of the nonmagnetic liquid. The non-magnetic fluid is selected to have low viscosity, so that the magnet has a fast response time.
摘要:
A shock sensor detects shocks or accelerations from all directions in a plane. A coil (24) produces a magnetic field (M). A magnetic fluid (25) is sealed in a closed container located in the magnetic field. A magnetoresistive effect element (22) is also located in the magnetic field (M) and opposes the magnetic fluid. The magnetic fluid (25) moves relative to the magnetoresistive effect element (22) when the magnetic fluid receives a shock. When the magnetoresistive effect element (22) is subjected to a change in magnetic field (M), the resistance of the magnetoresistive effect element (M) changes. The magnetoresistive effect element (M) may be formed of four elements (R1-R4) in a bridge configuration and the output of the bridge is processed in an output circuit. The output circuit outputs a sensor output when the magnetic fluid (M) moves relative to the magnetoresistive effect element (22).
摘要:
The invention has as an object to detect a deceleration or acceleration of an automotive vehicle, occuring as a consequence of a collision in motorised traffic, said automotive vehicle being provided with an installation according to the invention, said detection being made by means of this installation and thus causing automatic activation of the alarm light installation, present on the automative vehicle, and thus without any action in that respect by the driver, this with the intention of drawing the attention of the other participants in the traffic as soon as possible to the dangerous traffic condition caused.